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1 | /* | |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. | |
9 | * | |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include "irq.h" | |
20 | #include "mmu.h" | |
21 | #include "cpuid.h" | |
22 | ||
23 | #include <linux/kvm_host.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/highmem.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/mod_devicetable.h> | |
31 | #include <linux/ftrace_event.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/tboot.h> | |
34 | #include "kvm_cache_regs.h" | |
35 | #include "x86.h" | |
36 | ||
37 | #include <asm/io.h> | |
38 | #include <asm/desc.h> | |
39 | #include <asm/vmx.h> | |
40 | #include <asm/virtext.h> | |
41 | #include <asm/mce.h> | |
42 | #include <asm/i387.h> | |
43 | #include <asm/xcr.h> | |
44 | #include <asm/perf_event.h> | |
45 | #include <asm/kexec.h> | |
46 | ||
47 | #include "trace.h" | |
48 | ||
49 | #define __ex(x) __kvm_handle_fault_on_reboot(x) | |
50 | #define __ex_clear(x, reg) \ | |
51 | ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg) | |
52 | ||
53 | MODULE_AUTHOR("Qumranet"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
56 | static const struct x86_cpu_id vmx_cpu_id[] = { | |
57 | X86_FEATURE_MATCH(X86_FEATURE_VMX), | |
58 | {} | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id); | |
61 | ||
62 | static bool __read_mostly enable_vpid = 1; | |
63 | module_param_named(vpid, enable_vpid, bool, 0444); | |
64 | ||
65 | static bool __read_mostly flexpriority_enabled = 1; | |
66 | module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO); | |
67 | ||
68 | static bool __read_mostly enable_ept = 1; | |
69 | module_param_named(ept, enable_ept, bool, S_IRUGO); | |
70 | ||
71 | static bool __read_mostly enable_unrestricted_guest = 1; | |
72 | module_param_named(unrestricted_guest, | |
73 | enable_unrestricted_guest, bool, S_IRUGO); | |
74 | ||
75 | static bool __read_mostly enable_ept_ad_bits = 1; | |
76 | module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO); | |
77 | ||
78 | static bool __read_mostly emulate_invalid_guest_state = true; | |
79 | module_param(emulate_invalid_guest_state, bool, S_IRUGO); | |
80 | ||
81 | static bool __read_mostly vmm_exclusive = 1; | |
82 | module_param(vmm_exclusive, bool, S_IRUGO); | |
83 | ||
84 | static bool __read_mostly fasteoi = 1; | |
85 | module_param(fasteoi, bool, S_IRUGO); | |
86 | ||
87 | static bool __read_mostly enable_apicv = 1; | |
88 | module_param(enable_apicv, bool, S_IRUGO); | |
89 | ||
90 | static bool __read_mostly enable_shadow_vmcs = 1; | |
91 | module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO); | |
92 | /* | |
93 | * If nested=1, nested virtualization is supported, i.e., guests may use | |
94 | * VMX and be a hypervisor for its own guests. If nested=0, guests may not | |
95 | * use VMX instructions. | |
96 | */ | |
97 | static bool __read_mostly nested = 0; | |
98 | module_param(nested, bool, S_IRUGO); | |
99 | ||
100 | #define KVM_GUEST_CR0_MASK (X86_CR0_NW | X86_CR0_CD) | |
101 | #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST (X86_CR0_WP | X86_CR0_NE) | |
102 | #define KVM_VM_CR0_ALWAYS_ON \ | |
103 | (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE) | |
104 | #define KVM_CR4_GUEST_OWNED_BITS \ | |
105 | (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \ | |
106 | | X86_CR4_OSXMMEXCPT) | |
107 | ||
108 | #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE) | |
109 | #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE) | |
110 | ||
111 | #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM)) | |
112 | ||
113 | /* | |
114 | * These 2 parameters are used to config the controls for Pause-Loop Exiting: | |
115 | * ple_gap: upper bound on the amount of time between two successive | |
116 | * executions of PAUSE in a loop. Also indicate if ple enabled. | |
117 | * According to test, this time is usually smaller than 128 cycles. | |
118 | * ple_window: upper bound on the amount of time a guest is allowed to execute | |
119 | * in a PAUSE loop. Tests indicate that most spinlocks are held for | |
120 | * less than 2^12 cycles | |
121 | * Time is measured based on a counter that runs at the same rate as the TSC, | |
122 | * refer SDM volume 3b section 21.6.13 & 22.1.3. | |
123 | */ | |
124 | #define KVM_VMX_DEFAULT_PLE_GAP 128 | |
125 | #define KVM_VMX_DEFAULT_PLE_WINDOW 4096 | |
126 | static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP; | |
127 | module_param(ple_gap, int, S_IRUGO); | |
128 | ||
129 | static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; | |
130 | module_param(ple_window, int, S_IRUGO); | |
131 | ||
132 | extern const ulong vmx_return; | |
133 | ||
134 | #define NR_AUTOLOAD_MSRS 8 | |
135 | #define VMCS02_POOL_SIZE 1 | |
136 | ||
137 | struct vmcs { | |
138 | u32 revision_id; | |
139 | u32 abort; | |
140 | char data[0]; | |
141 | }; | |
142 | ||
143 | /* | |
144 | * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also | |
145 | * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs | |
146 | * loaded on this CPU (so we can clear them if the CPU goes down). | |
147 | */ | |
148 | struct loaded_vmcs { | |
149 | struct vmcs *vmcs; | |
150 | int cpu; | |
151 | int launched; | |
152 | struct list_head loaded_vmcss_on_cpu_link; | |
153 | }; | |
154 | ||
155 | struct shared_msr_entry { | |
156 | unsigned index; | |
157 | u64 data; | |
158 | u64 mask; | |
159 | }; | |
160 | ||
161 | /* | |
162 | * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a | |
163 | * single nested guest (L2), hence the name vmcs12. Any VMX implementation has | |
164 | * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is | |
165 | * stored in guest memory specified by VMPTRLD, but is opaque to the guest, | |
166 | * which must access it using VMREAD/VMWRITE/VMCLEAR instructions. | |
167 | * More than one of these structures may exist, if L1 runs multiple L2 guests. | |
168 | * nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the | |
169 | * underlying hardware which will be used to run L2. | |
170 | * This structure is packed to ensure that its layout is identical across | |
171 | * machines (necessary for live migration). | |
172 | * If there are changes in this struct, VMCS12_REVISION must be changed. | |
173 | */ | |
174 | typedef u64 natural_width; | |
175 | struct __packed vmcs12 { | |
176 | /* According to the Intel spec, a VMCS region must start with the | |
177 | * following two fields. Then follow implementation-specific data. | |
178 | */ | |
179 | u32 revision_id; | |
180 | u32 abort; | |
181 | ||
182 | u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */ | |
183 | u32 padding[7]; /* room for future expansion */ | |
184 | ||
185 | u64 io_bitmap_a; | |
186 | u64 io_bitmap_b; | |
187 | u64 msr_bitmap; | |
188 | u64 vm_exit_msr_store_addr; | |
189 | u64 vm_exit_msr_load_addr; | |
190 | u64 vm_entry_msr_load_addr; | |
191 | u64 tsc_offset; | |
192 | u64 virtual_apic_page_addr; | |
193 | u64 apic_access_addr; | |
194 | u64 ept_pointer; | |
195 | u64 guest_physical_address; | |
196 | u64 vmcs_link_pointer; | |
197 | u64 guest_ia32_debugctl; | |
198 | u64 guest_ia32_pat; | |
199 | u64 guest_ia32_efer; | |
200 | u64 guest_ia32_perf_global_ctrl; | |
201 | u64 guest_pdptr0; | |
202 | u64 guest_pdptr1; | |
203 | u64 guest_pdptr2; | |
204 | u64 guest_pdptr3; | |
205 | u64 host_ia32_pat; | |
206 | u64 host_ia32_efer; | |
207 | u64 host_ia32_perf_global_ctrl; | |
208 | u64 padding64[8]; /* room for future expansion */ | |
209 | /* | |
210 | * To allow migration of L1 (complete with its L2 guests) between | |
211 | * machines of different natural widths (32 or 64 bit), we cannot have | |
212 | * unsigned long fields with no explict size. We use u64 (aliased | |
213 | * natural_width) instead. Luckily, x86 is little-endian. | |
214 | */ | |
215 | natural_width cr0_guest_host_mask; | |
216 | natural_width cr4_guest_host_mask; | |
217 | natural_width cr0_read_shadow; | |
218 | natural_width cr4_read_shadow; | |
219 | natural_width cr3_target_value0; | |
220 | natural_width cr3_target_value1; | |
221 | natural_width cr3_target_value2; | |
222 | natural_width cr3_target_value3; | |
223 | natural_width exit_qualification; | |
224 | natural_width guest_linear_address; | |
225 | natural_width guest_cr0; | |
226 | natural_width guest_cr3; | |
227 | natural_width guest_cr4; | |
228 | natural_width guest_es_base; | |
229 | natural_width guest_cs_base; | |
230 | natural_width guest_ss_base; | |
231 | natural_width guest_ds_base; | |
232 | natural_width guest_fs_base; | |
233 | natural_width guest_gs_base; | |
234 | natural_width guest_ldtr_base; | |
235 | natural_width guest_tr_base; | |
236 | natural_width guest_gdtr_base; | |
237 | natural_width guest_idtr_base; | |
238 | natural_width guest_dr7; | |
239 | natural_width guest_rsp; | |
240 | natural_width guest_rip; | |
241 | natural_width guest_rflags; | |
242 | natural_width guest_pending_dbg_exceptions; | |
243 | natural_width guest_sysenter_esp; | |
244 | natural_width guest_sysenter_eip; | |
245 | natural_width host_cr0; | |
246 | natural_width host_cr3; | |
247 | natural_width host_cr4; | |
248 | natural_width host_fs_base; | |
249 | natural_width host_gs_base; | |
250 | natural_width host_tr_base; | |
251 | natural_width host_gdtr_base; | |
252 | natural_width host_idtr_base; | |
253 | natural_width host_ia32_sysenter_esp; | |
254 | natural_width host_ia32_sysenter_eip; | |
255 | natural_width host_rsp; | |
256 | natural_width host_rip; | |
257 | natural_width paddingl[8]; /* room for future expansion */ | |
258 | u32 pin_based_vm_exec_control; | |
259 | u32 cpu_based_vm_exec_control; | |
260 | u32 exception_bitmap; | |
261 | u32 page_fault_error_code_mask; | |
262 | u32 page_fault_error_code_match; | |
263 | u32 cr3_target_count; | |
264 | u32 vm_exit_controls; | |
265 | u32 vm_exit_msr_store_count; | |
266 | u32 vm_exit_msr_load_count; | |
267 | u32 vm_entry_controls; | |
268 | u32 vm_entry_msr_load_count; | |
269 | u32 vm_entry_intr_info_field; | |
270 | u32 vm_entry_exception_error_code; | |
271 | u32 vm_entry_instruction_len; | |
272 | u32 tpr_threshold; | |
273 | u32 secondary_vm_exec_control; | |
274 | u32 vm_instruction_error; | |
275 | u32 vm_exit_reason; | |
276 | u32 vm_exit_intr_info; | |
277 | u32 vm_exit_intr_error_code; | |
278 | u32 idt_vectoring_info_field; | |
279 | u32 idt_vectoring_error_code; | |
280 | u32 vm_exit_instruction_len; | |
281 | u32 vmx_instruction_info; | |
282 | u32 guest_es_limit; | |
283 | u32 guest_cs_limit; | |
284 | u32 guest_ss_limit; | |
285 | u32 guest_ds_limit; | |
286 | u32 guest_fs_limit; | |
287 | u32 guest_gs_limit; | |
288 | u32 guest_ldtr_limit; | |
289 | u32 guest_tr_limit; | |
290 | u32 guest_gdtr_limit; | |
291 | u32 guest_idtr_limit; | |
292 | u32 guest_es_ar_bytes; | |
293 | u32 guest_cs_ar_bytes; | |
294 | u32 guest_ss_ar_bytes; | |
295 | u32 guest_ds_ar_bytes; | |
296 | u32 guest_fs_ar_bytes; | |
297 | u32 guest_gs_ar_bytes; | |
298 | u32 guest_ldtr_ar_bytes; | |
299 | u32 guest_tr_ar_bytes; | |
300 | u32 guest_interruptibility_info; | |
301 | u32 guest_activity_state; | |
302 | u32 guest_sysenter_cs; | |
303 | u32 host_ia32_sysenter_cs; | |
304 | u32 vmx_preemption_timer_value; | |
305 | u32 padding32[7]; /* room for future expansion */ | |
306 | u16 virtual_processor_id; | |
307 | u16 guest_es_selector; | |
308 | u16 guest_cs_selector; | |
309 | u16 guest_ss_selector; | |
310 | u16 guest_ds_selector; | |
311 | u16 guest_fs_selector; | |
312 | u16 guest_gs_selector; | |
313 | u16 guest_ldtr_selector; | |
314 | u16 guest_tr_selector; | |
315 | u16 host_es_selector; | |
316 | u16 host_cs_selector; | |
317 | u16 host_ss_selector; | |
318 | u16 host_ds_selector; | |
319 | u16 host_fs_selector; | |
320 | u16 host_gs_selector; | |
321 | u16 host_tr_selector; | |
322 | }; | |
323 | ||
324 | /* | |
325 | * VMCS12_REVISION is an arbitrary id that should be changed if the content or | |
326 | * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and | |
327 | * VMPTRLD verifies that the VMCS region that L1 is loading contains this id. | |
328 | */ | |
329 | #define VMCS12_REVISION 0x11e57ed0 | |
330 | ||
331 | /* | |
332 | * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region | |
333 | * and any VMCS region. Although only sizeof(struct vmcs12) are used by the | |
334 | * current implementation, 4K are reserved to avoid future complications. | |
335 | */ | |
336 | #define VMCS12_SIZE 0x1000 | |
337 | ||
338 | /* Used to remember the last vmcs02 used for some recently used vmcs12s */ | |
339 | struct vmcs02_list { | |
340 | struct list_head list; | |
341 | gpa_t vmptr; | |
342 | struct loaded_vmcs vmcs02; | |
343 | }; | |
344 | ||
345 | /* | |
346 | * The nested_vmx structure is part of vcpu_vmx, and holds information we need | |
347 | * for correct emulation of VMX (i.e., nested VMX) on this vcpu. | |
348 | */ | |
349 | struct nested_vmx { | |
350 | /* Has the level1 guest done vmxon? */ | |
351 | bool vmxon; | |
352 | ||
353 | /* The guest-physical address of the current VMCS L1 keeps for L2 */ | |
354 | gpa_t current_vmptr; | |
355 | /* The host-usable pointer to the above */ | |
356 | struct page *current_vmcs12_page; | |
357 | struct vmcs12 *current_vmcs12; | |
358 | struct vmcs *current_shadow_vmcs; | |
359 | /* | |
360 | * Indicates if the shadow vmcs must be updated with the | |
361 | * data hold by vmcs12 | |
362 | */ | |
363 | bool sync_shadow_vmcs; | |
364 | ||
365 | /* vmcs02_list cache of VMCSs recently used to run L2 guests */ | |
366 | struct list_head vmcs02_pool; | |
367 | int vmcs02_num; | |
368 | u64 vmcs01_tsc_offset; | |
369 | /* L2 must run next, and mustn't decide to exit to L1. */ | |
370 | bool nested_run_pending; | |
371 | /* | |
372 | * Guest pages referred to in vmcs02 with host-physical pointers, so | |
373 | * we must keep them pinned while L2 runs. | |
374 | */ | |
375 | struct page *apic_access_page; | |
376 | }; | |
377 | ||
378 | #define POSTED_INTR_ON 0 | |
379 | /* Posted-Interrupt Descriptor */ | |
380 | struct pi_desc { | |
381 | u32 pir[8]; /* Posted interrupt requested */ | |
382 | u32 control; /* bit 0 of control is outstanding notification bit */ | |
383 | u32 rsvd[7]; | |
384 | } __aligned(64); | |
385 | ||
386 | static bool pi_test_and_set_on(struct pi_desc *pi_desc) | |
387 | { | |
388 | return test_and_set_bit(POSTED_INTR_ON, | |
389 | (unsigned long *)&pi_desc->control); | |
390 | } | |
391 | ||
392 | static bool pi_test_and_clear_on(struct pi_desc *pi_desc) | |
393 | { | |
394 | return test_and_clear_bit(POSTED_INTR_ON, | |
395 | (unsigned long *)&pi_desc->control); | |
396 | } | |
397 | ||
398 | static int pi_test_and_set_pir(int vector, struct pi_desc *pi_desc) | |
399 | { | |
400 | return test_and_set_bit(vector, (unsigned long *)pi_desc->pir); | |
401 | } | |
402 | ||
403 | struct vcpu_vmx { | |
404 | struct kvm_vcpu vcpu; | |
405 | unsigned long host_rsp; | |
406 | u8 fail; | |
407 | u8 cpl; | |
408 | bool nmi_known_unmasked; | |
409 | u32 exit_intr_info; | |
410 | u32 idt_vectoring_info; | |
411 | ulong rflags; | |
412 | struct shared_msr_entry *guest_msrs; | |
413 | int nmsrs; | |
414 | int save_nmsrs; | |
415 | unsigned long host_idt_base; | |
416 | #ifdef CONFIG_X86_64 | |
417 | u64 msr_host_kernel_gs_base; | |
418 | u64 msr_guest_kernel_gs_base; | |
419 | #endif | |
420 | /* | |
421 | * loaded_vmcs points to the VMCS currently used in this vcpu. For a | |
422 | * non-nested (L1) guest, it always points to vmcs01. For a nested | |
423 | * guest (L2), it points to a different VMCS. | |
424 | */ | |
425 | struct loaded_vmcs vmcs01; | |
426 | struct loaded_vmcs *loaded_vmcs; | |
427 | bool __launched; /* temporary, used in vmx_vcpu_run */ | |
428 | struct msr_autoload { | |
429 | unsigned nr; | |
430 | struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS]; | |
431 | struct vmx_msr_entry host[NR_AUTOLOAD_MSRS]; | |
432 | } msr_autoload; | |
433 | struct { | |
434 | int loaded; | |
435 | u16 fs_sel, gs_sel, ldt_sel; | |
436 | #ifdef CONFIG_X86_64 | |
437 | u16 ds_sel, es_sel; | |
438 | #endif | |
439 | int gs_ldt_reload_needed; | |
440 | int fs_reload_needed; | |
441 | } host_state; | |
442 | struct { | |
443 | int vm86_active; | |
444 | ulong save_rflags; | |
445 | struct kvm_segment segs[8]; | |
446 | } rmode; | |
447 | struct { | |
448 | u32 bitmask; /* 4 bits per segment (1 bit per field) */ | |
449 | struct kvm_save_segment { | |
450 | u16 selector; | |
451 | unsigned long base; | |
452 | u32 limit; | |
453 | u32 ar; | |
454 | } seg[8]; | |
455 | } segment_cache; | |
456 | int vpid; | |
457 | bool emulation_required; | |
458 | ||
459 | /* Support for vnmi-less CPUs */ | |
460 | int soft_vnmi_blocked; | |
461 | ktime_t entry_time; | |
462 | s64 vnmi_blocked_time; | |
463 | u32 exit_reason; | |
464 | ||
465 | bool rdtscp_enabled; | |
466 | ||
467 | /* Posted interrupt descriptor */ | |
468 | struct pi_desc pi_desc; | |
469 | ||
470 | /* Support for a guest hypervisor (nested VMX) */ | |
471 | struct nested_vmx nested; | |
472 | }; | |
473 | ||
474 | enum segment_cache_field { | |
475 | SEG_FIELD_SEL = 0, | |
476 | SEG_FIELD_BASE = 1, | |
477 | SEG_FIELD_LIMIT = 2, | |
478 | SEG_FIELD_AR = 3, | |
479 | ||
480 | SEG_FIELD_NR = 4 | |
481 | }; | |
482 | ||
483 | static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu) | |
484 | { | |
485 | return container_of(vcpu, struct vcpu_vmx, vcpu); | |
486 | } | |
487 | ||
488 | #define VMCS12_OFFSET(x) offsetof(struct vmcs12, x) | |
489 | #define FIELD(number, name) [number] = VMCS12_OFFSET(name) | |
490 | #define FIELD64(number, name) [number] = VMCS12_OFFSET(name), \ | |
491 | [number##_HIGH] = VMCS12_OFFSET(name)+4 | |
492 | ||
493 | ||
494 | static const unsigned long shadow_read_only_fields[] = { | |
495 | /* | |
496 | * We do NOT shadow fields that are modified when L0 | |
497 | * traps and emulates any vmx instruction (e.g. VMPTRLD, | |
498 | * VMXON...) executed by L1. | |
499 | * For example, VM_INSTRUCTION_ERROR is read | |
500 | * by L1 if a vmx instruction fails (part of the error path). | |
501 | * Note the code assumes this logic. If for some reason | |
502 | * we start shadowing these fields then we need to | |
503 | * force a shadow sync when L0 emulates vmx instructions | |
504 | * (e.g. force a sync if VM_INSTRUCTION_ERROR is modified | |
505 | * by nested_vmx_failValid) | |
506 | */ | |
507 | VM_EXIT_REASON, | |
508 | VM_EXIT_INTR_INFO, | |
509 | VM_EXIT_INSTRUCTION_LEN, | |
510 | IDT_VECTORING_INFO_FIELD, | |
511 | IDT_VECTORING_ERROR_CODE, | |
512 | VM_EXIT_INTR_ERROR_CODE, | |
513 | EXIT_QUALIFICATION, | |
514 | GUEST_LINEAR_ADDRESS, | |
515 | GUEST_PHYSICAL_ADDRESS | |
516 | }; | |
517 | static const int max_shadow_read_only_fields = | |
518 | ARRAY_SIZE(shadow_read_only_fields); | |
519 | ||
520 | static const unsigned long shadow_read_write_fields[] = { | |
521 | GUEST_RIP, | |
522 | GUEST_RSP, | |
523 | GUEST_CR0, | |
524 | GUEST_CR3, | |
525 | GUEST_CR4, | |
526 | GUEST_INTERRUPTIBILITY_INFO, | |
527 | GUEST_RFLAGS, | |
528 | GUEST_CS_SELECTOR, | |
529 | GUEST_CS_AR_BYTES, | |
530 | GUEST_CS_LIMIT, | |
531 | GUEST_CS_BASE, | |
532 | GUEST_ES_BASE, | |
533 | CR0_GUEST_HOST_MASK, | |
534 | CR0_READ_SHADOW, | |
535 | CR4_READ_SHADOW, | |
536 | TSC_OFFSET, | |
537 | EXCEPTION_BITMAP, | |
538 | CPU_BASED_VM_EXEC_CONTROL, | |
539 | VM_ENTRY_EXCEPTION_ERROR_CODE, | |
540 | VM_ENTRY_INTR_INFO_FIELD, | |
541 | VM_ENTRY_INSTRUCTION_LEN, | |
542 | VM_ENTRY_EXCEPTION_ERROR_CODE, | |
543 | HOST_FS_BASE, | |
544 | HOST_GS_BASE, | |
545 | HOST_FS_SELECTOR, | |
546 | HOST_GS_SELECTOR | |
547 | }; | |
548 | static const int max_shadow_read_write_fields = | |
549 | ARRAY_SIZE(shadow_read_write_fields); | |
550 | ||
551 | static const unsigned short vmcs_field_to_offset_table[] = { | |
552 | FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id), | |
553 | FIELD(GUEST_ES_SELECTOR, guest_es_selector), | |
554 | FIELD(GUEST_CS_SELECTOR, guest_cs_selector), | |
555 | FIELD(GUEST_SS_SELECTOR, guest_ss_selector), | |
556 | FIELD(GUEST_DS_SELECTOR, guest_ds_selector), | |
557 | FIELD(GUEST_FS_SELECTOR, guest_fs_selector), | |
558 | FIELD(GUEST_GS_SELECTOR, guest_gs_selector), | |
559 | FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector), | |
560 | FIELD(GUEST_TR_SELECTOR, guest_tr_selector), | |
561 | FIELD(HOST_ES_SELECTOR, host_es_selector), | |
562 | FIELD(HOST_CS_SELECTOR, host_cs_selector), | |
563 | FIELD(HOST_SS_SELECTOR, host_ss_selector), | |
564 | FIELD(HOST_DS_SELECTOR, host_ds_selector), | |
565 | FIELD(HOST_FS_SELECTOR, host_fs_selector), | |
566 | FIELD(HOST_GS_SELECTOR, host_gs_selector), | |
567 | FIELD(HOST_TR_SELECTOR, host_tr_selector), | |
568 | FIELD64(IO_BITMAP_A, io_bitmap_a), | |
569 | FIELD64(IO_BITMAP_B, io_bitmap_b), | |
570 | FIELD64(MSR_BITMAP, msr_bitmap), | |
571 | FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr), | |
572 | FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr), | |
573 | FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr), | |
574 | FIELD64(TSC_OFFSET, tsc_offset), | |
575 | FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr), | |
576 | FIELD64(APIC_ACCESS_ADDR, apic_access_addr), | |
577 | FIELD64(EPT_POINTER, ept_pointer), | |
578 | FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address), | |
579 | FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer), | |
580 | FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl), | |
581 | FIELD64(GUEST_IA32_PAT, guest_ia32_pat), | |
582 | FIELD64(GUEST_IA32_EFER, guest_ia32_efer), | |
583 | FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl), | |
584 | FIELD64(GUEST_PDPTR0, guest_pdptr0), | |
585 | FIELD64(GUEST_PDPTR1, guest_pdptr1), | |
586 | FIELD64(GUEST_PDPTR2, guest_pdptr2), | |
587 | FIELD64(GUEST_PDPTR3, guest_pdptr3), | |
588 | FIELD64(HOST_IA32_PAT, host_ia32_pat), | |
589 | FIELD64(HOST_IA32_EFER, host_ia32_efer), | |
590 | FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl), | |
591 | FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control), | |
592 | FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control), | |
593 | FIELD(EXCEPTION_BITMAP, exception_bitmap), | |
594 | FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask), | |
595 | FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match), | |
596 | FIELD(CR3_TARGET_COUNT, cr3_target_count), | |
597 | FIELD(VM_EXIT_CONTROLS, vm_exit_controls), | |
598 | FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count), | |
599 | FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count), | |
600 | FIELD(VM_ENTRY_CONTROLS, vm_entry_controls), | |
601 | FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count), | |
602 | FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field), | |
603 | FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code), | |
604 | FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len), | |
605 | FIELD(TPR_THRESHOLD, tpr_threshold), | |
606 | FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control), | |
607 | FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error), | |
608 | FIELD(VM_EXIT_REASON, vm_exit_reason), | |
609 | FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info), | |
610 | FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code), | |
611 | FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field), | |
612 | FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code), | |
613 | FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len), | |
614 | FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info), | |
615 | FIELD(GUEST_ES_LIMIT, guest_es_limit), | |
616 | FIELD(GUEST_CS_LIMIT, guest_cs_limit), | |
617 | FIELD(GUEST_SS_LIMIT, guest_ss_limit), | |
618 | FIELD(GUEST_DS_LIMIT, guest_ds_limit), | |
619 | FIELD(GUEST_FS_LIMIT, guest_fs_limit), | |
620 | FIELD(GUEST_GS_LIMIT, guest_gs_limit), | |
621 | FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit), | |
622 | FIELD(GUEST_TR_LIMIT, guest_tr_limit), | |
623 | FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit), | |
624 | FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit), | |
625 | FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes), | |
626 | FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes), | |
627 | FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes), | |
628 | FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes), | |
629 | FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes), | |
630 | FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes), | |
631 | FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes), | |
632 | FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes), | |
633 | FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info), | |
634 | FIELD(GUEST_ACTIVITY_STATE, guest_activity_state), | |
635 | FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs), | |
636 | FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs), | |
637 | FIELD(VMX_PREEMPTION_TIMER_VALUE, vmx_preemption_timer_value), | |
638 | FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask), | |
639 | FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask), | |
640 | FIELD(CR0_READ_SHADOW, cr0_read_shadow), | |
641 | FIELD(CR4_READ_SHADOW, cr4_read_shadow), | |
642 | FIELD(CR3_TARGET_VALUE0, cr3_target_value0), | |
643 | FIELD(CR3_TARGET_VALUE1, cr3_target_value1), | |
644 | FIELD(CR3_TARGET_VALUE2, cr3_target_value2), | |
645 | FIELD(CR3_TARGET_VALUE3, cr3_target_value3), | |
646 | FIELD(EXIT_QUALIFICATION, exit_qualification), | |
647 | FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address), | |
648 | FIELD(GUEST_CR0, guest_cr0), | |
649 | FIELD(GUEST_CR3, guest_cr3), | |
650 | FIELD(GUEST_CR4, guest_cr4), | |
651 | FIELD(GUEST_ES_BASE, guest_es_base), | |
652 | FIELD(GUEST_CS_BASE, guest_cs_base), | |
653 | FIELD(GUEST_SS_BASE, guest_ss_base), | |
654 | FIELD(GUEST_DS_BASE, guest_ds_base), | |
655 | FIELD(GUEST_FS_BASE, guest_fs_base), | |
656 | FIELD(GUEST_GS_BASE, guest_gs_base), | |
657 | FIELD(GUEST_LDTR_BASE, guest_ldtr_base), | |
658 | FIELD(GUEST_TR_BASE, guest_tr_base), | |
659 | FIELD(GUEST_GDTR_BASE, guest_gdtr_base), | |
660 | FIELD(GUEST_IDTR_BASE, guest_idtr_base), | |
661 | FIELD(GUEST_DR7, guest_dr7), | |
662 | FIELD(GUEST_RSP, guest_rsp), | |
663 | FIELD(GUEST_RIP, guest_rip), | |
664 | FIELD(GUEST_RFLAGS, guest_rflags), | |
665 | FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions), | |
666 | FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp), | |
667 | FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip), | |
668 | FIELD(HOST_CR0, host_cr0), | |
669 | FIELD(HOST_CR3, host_cr3), | |
670 | FIELD(HOST_CR4, host_cr4), | |
671 | FIELD(HOST_FS_BASE, host_fs_base), | |
672 | FIELD(HOST_GS_BASE, host_gs_base), | |
673 | FIELD(HOST_TR_BASE, host_tr_base), | |
674 | FIELD(HOST_GDTR_BASE, host_gdtr_base), | |
675 | FIELD(HOST_IDTR_BASE, host_idtr_base), | |
676 | FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp), | |
677 | FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip), | |
678 | FIELD(HOST_RSP, host_rsp), | |
679 | FIELD(HOST_RIP, host_rip), | |
680 | }; | |
681 | static const int max_vmcs_field = ARRAY_SIZE(vmcs_field_to_offset_table); | |
682 | ||
683 | static inline short vmcs_field_to_offset(unsigned long field) | |
684 | { | |
685 | if (field >= max_vmcs_field || vmcs_field_to_offset_table[field] == 0) | |
686 | return -1; | |
687 | return vmcs_field_to_offset_table[field]; | |
688 | } | |
689 | ||
690 | static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu) | |
691 | { | |
692 | return to_vmx(vcpu)->nested.current_vmcs12; | |
693 | } | |
694 | ||
695 | static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr) | |
696 | { | |
697 | struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT); | |
698 | if (is_error_page(page)) | |
699 | return NULL; | |
700 | ||
701 | return page; | |
702 | } | |
703 | ||
704 | static void nested_release_page(struct page *page) | |
705 | { | |
706 | kvm_release_page_dirty(page); | |
707 | } | |
708 | ||
709 | static void nested_release_page_clean(struct page *page) | |
710 | { | |
711 | kvm_release_page_clean(page); | |
712 | } | |
713 | ||
714 | static u64 construct_eptp(unsigned long root_hpa); | |
715 | static void kvm_cpu_vmxon(u64 addr); | |
716 | static void kvm_cpu_vmxoff(void); | |
717 | static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3); | |
718 | static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr); | |
719 | static void vmx_set_segment(struct kvm_vcpu *vcpu, | |
720 | struct kvm_segment *var, int seg); | |
721 | static void vmx_get_segment(struct kvm_vcpu *vcpu, | |
722 | struct kvm_segment *var, int seg); | |
723 | static bool guest_state_valid(struct kvm_vcpu *vcpu); | |
724 | static u32 vmx_segment_access_rights(struct kvm_segment *var); | |
725 | static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu); | |
726 | static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx); | |
727 | static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx); | |
728 | ||
729 | static DEFINE_PER_CPU(struct vmcs *, vmxarea); | |
730 | static DEFINE_PER_CPU(struct vmcs *, current_vmcs); | |
731 | /* | |
732 | * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed | |
733 | * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it. | |
734 | */ | |
735 | static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu); | |
736 | static DEFINE_PER_CPU(struct desc_ptr, host_gdt); | |
737 | ||
738 | static unsigned long *vmx_io_bitmap_a; | |
739 | static unsigned long *vmx_io_bitmap_b; | |
740 | static unsigned long *vmx_msr_bitmap_legacy; | |
741 | static unsigned long *vmx_msr_bitmap_longmode; | |
742 | static unsigned long *vmx_msr_bitmap_legacy_x2apic; | |
743 | static unsigned long *vmx_msr_bitmap_longmode_x2apic; | |
744 | static unsigned long *vmx_vmread_bitmap; | |
745 | static unsigned long *vmx_vmwrite_bitmap; | |
746 | ||
747 | static bool cpu_has_load_ia32_efer; | |
748 | static bool cpu_has_load_perf_global_ctrl; | |
749 | ||
750 | static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); | |
751 | static DEFINE_SPINLOCK(vmx_vpid_lock); | |
752 | ||
753 | static struct vmcs_config { | |
754 | int size; | |
755 | int order; | |
756 | u32 revision_id; | |
757 | u32 pin_based_exec_ctrl; | |
758 | u32 cpu_based_exec_ctrl; | |
759 | u32 cpu_based_2nd_exec_ctrl; | |
760 | u32 vmexit_ctrl; | |
761 | u32 vmentry_ctrl; | |
762 | } vmcs_config; | |
763 | ||
764 | static struct vmx_capability { | |
765 | u32 ept; | |
766 | u32 vpid; | |
767 | } vmx_capability; | |
768 | ||
769 | #define VMX_SEGMENT_FIELD(seg) \ | |
770 | [VCPU_SREG_##seg] = { \ | |
771 | .selector = GUEST_##seg##_SELECTOR, \ | |
772 | .base = GUEST_##seg##_BASE, \ | |
773 | .limit = GUEST_##seg##_LIMIT, \ | |
774 | .ar_bytes = GUEST_##seg##_AR_BYTES, \ | |
775 | } | |
776 | ||
777 | static const struct kvm_vmx_segment_field { | |
778 | unsigned selector; | |
779 | unsigned base; | |
780 | unsigned limit; | |
781 | unsigned ar_bytes; | |
782 | } kvm_vmx_segment_fields[] = { | |
783 | VMX_SEGMENT_FIELD(CS), | |
784 | VMX_SEGMENT_FIELD(DS), | |
785 | VMX_SEGMENT_FIELD(ES), | |
786 | VMX_SEGMENT_FIELD(FS), | |
787 | VMX_SEGMENT_FIELD(GS), | |
788 | VMX_SEGMENT_FIELD(SS), | |
789 | VMX_SEGMENT_FIELD(TR), | |
790 | VMX_SEGMENT_FIELD(LDTR), | |
791 | }; | |
792 | ||
793 | static u64 host_efer; | |
794 | ||
795 | static void ept_save_pdptrs(struct kvm_vcpu *vcpu); | |
796 | ||
797 | /* | |
798 | * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it | |
799 | * away by decrementing the array size. | |
800 | */ | |
801 | static const u32 vmx_msr_index[] = { | |
802 | #ifdef CONFIG_X86_64 | |
803 | MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, | |
804 | #endif | |
805 | MSR_EFER, MSR_TSC_AUX, MSR_STAR, | |
806 | }; | |
807 | #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index) | |
808 | ||
809 | static inline bool is_page_fault(u32 intr_info) | |
810 | { | |
811 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
812 | INTR_INFO_VALID_MASK)) == | |
813 | (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK); | |
814 | } | |
815 | ||
816 | static inline bool is_no_device(u32 intr_info) | |
817 | { | |
818 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
819 | INTR_INFO_VALID_MASK)) == | |
820 | (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK); | |
821 | } | |
822 | ||
823 | static inline bool is_invalid_opcode(u32 intr_info) | |
824 | { | |
825 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
826 | INTR_INFO_VALID_MASK)) == | |
827 | (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK); | |
828 | } | |
829 | ||
830 | static inline bool is_external_interrupt(u32 intr_info) | |
831 | { | |
832 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) | |
833 | == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK); | |
834 | } | |
835 | ||
836 | static inline bool is_machine_check(u32 intr_info) | |
837 | { | |
838 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
839 | INTR_INFO_VALID_MASK)) == | |
840 | (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK); | |
841 | } | |
842 | ||
843 | static inline bool cpu_has_vmx_msr_bitmap(void) | |
844 | { | |
845 | return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS; | |
846 | } | |
847 | ||
848 | static inline bool cpu_has_vmx_tpr_shadow(void) | |
849 | { | |
850 | return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW; | |
851 | } | |
852 | ||
853 | static inline bool vm_need_tpr_shadow(struct kvm *kvm) | |
854 | { | |
855 | return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)); | |
856 | } | |
857 | ||
858 | static inline bool cpu_has_secondary_exec_ctrls(void) | |
859 | { | |
860 | return vmcs_config.cpu_based_exec_ctrl & | |
861 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; | |
862 | } | |
863 | ||
864 | static inline bool cpu_has_vmx_virtualize_apic_accesses(void) | |
865 | { | |
866 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
867 | SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
868 | } | |
869 | ||
870 | static inline bool cpu_has_vmx_virtualize_x2apic_mode(void) | |
871 | { | |
872 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
873 | SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; | |
874 | } | |
875 | ||
876 | static inline bool cpu_has_vmx_apic_register_virt(void) | |
877 | { | |
878 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
879 | SECONDARY_EXEC_APIC_REGISTER_VIRT; | |
880 | } | |
881 | ||
882 | static inline bool cpu_has_vmx_virtual_intr_delivery(void) | |
883 | { | |
884 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
885 | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY; | |
886 | } | |
887 | ||
888 | static inline bool cpu_has_vmx_posted_intr(void) | |
889 | { | |
890 | return vmcs_config.pin_based_exec_ctrl & PIN_BASED_POSTED_INTR; | |
891 | } | |
892 | ||
893 | static inline bool cpu_has_vmx_apicv(void) | |
894 | { | |
895 | return cpu_has_vmx_apic_register_virt() && | |
896 | cpu_has_vmx_virtual_intr_delivery() && | |
897 | cpu_has_vmx_posted_intr(); | |
898 | } | |
899 | ||
900 | static inline bool cpu_has_vmx_flexpriority(void) | |
901 | { | |
902 | return cpu_has_vmx_tpr_shadow() && | |
903 | cpu_has_vmx_virtualize_apic_accesses(); | |
904 | } | |
905 | ||
906 | static inline bool cpu_has_vmx_ept_execute_only(void) | |
907 | { | |
908 | return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT; | |
909 | } | |
910 | ||
911 | static inline bool cpu_has_vmx_eptp_uncacheable(void) | |
912 | { | |
913 | return vmx_capability.ept & VMX_EPTP_UC_BIT; | |
914 | } | |
915 | ||
916 | static inline bool cpu_has_vmx_eptp_writeback(void) | |
917 | { | |
918 | return vmx_capability.ept & VMX_EPTP_WB_BIT; | |
919 | } | |
920 | ||
921 | static inline bool cpu_has_vmx_ept_2m_page(void) | |
922 | { | |
923 | return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT; | |
924 | } | |
925 | ||
926 | static inline bool cpu_has_vmx_ept_1g_page(void) | |
927 | { | |
928 | return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT; | |
929 | } | |
930 | ||
931 | static inline bool cpu_has_vmx_ept_4levels(void) | |
932 | { | |
933 | return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT; | |
934 | } | |
935 | ||
936 | static inline bool cpu_has_vmx_ept_ad_bits(void) | |
937 | { | |
938 | return vmx_capability.ept & VMX_EPT_AD_BIT; | |
939 | } | |
940 | ||
941 | static inline bool cpu_has_vmx_invept_context(void) | |
942 | { | |
943 | return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT; | |
944 | } | |
945 | ||
946 | static inline bool cpu_has_vmx_invept_global(void) | |
947 | { | |
948 | return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT; | |
949 | } | |
950 | ||
951 | static inline bool cpu_has_vmx_invvpid_single(void) | |
952 | { | |
953 | return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT; | |
954 | } | |
955 | ||
956 | static inline bool cpu_has_vmx_invvpid_global(void) | |
957 | { | |
958 | return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT; | |
959 | } | |
960 | ||
961 | static inline bool cpu_has_vmx_ept(void) | |
962 | { | |
963 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
964 | SECONDARY_EXEC_ENABLE_EPT; | |
965 | } | |
966 | ||
967 | static inline bool cpu_has_vmx_unrestricted_guest(void) | |
968 | { | |
969 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
970 | SECONDARY_EXEC_UNRESTRICTED_GUEST; | |
971 | } | |
972 | ||
973 | static inline bool cpu_has_vmx_ple(void) | |
974 | { | |
975 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
976 | SECONDARY_EXEC_PAUSE_LOOP_EXITING; | |
977 | } | |
978 | ||
979 | static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm) | |
980 | { | |
981 | return flexpriority_enabled && irqchip_in_kernel(kvm); | |
982 | } | |
983 | ||
984 | static inline bool cpu_has_vmx_vpid(void) | |
985 | { | |
986 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
987 | SECONDARY_EXEC_ENABLE_VPID; | |
988 | } | |
989 | ||
990 | static inline bool cpu_has_vmx_rdtscp(void) | |
991 | { | |
992 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
993 | SECONDARY_EXEC_RDTSCP; | |
994 | } | |
995 | ||
996 | static inline bool cpu_has_vmx_invpcid(void) | |
997 | { | |
998 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
999 | SECONDARY_EXEC_ENABLE_INVPCID; | |
1000 | } | |
1001 | ||
1002 | static inline bool cpu_has_virtual_nmis(void) | |
1003 | { | |
1004 | return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS; | |
1005 | } | |
1006 | ||
1007 | static inline bool cpu_has_vmx_wbinvd_exit(void) | |
1008 | { | |
1009 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
1010 | SECONDARY_EXEC_WBINVD_EXITING; | |
1011 | } | |
1012 | ||
1013 | static inline bool cpu_has_vmx_shadow_vmcs(void) | |
1014 | { | |
1015 | u64 vmx_msr; | |
1016 | rdmsrl(MSR_IA32_VMX_MISC, vmx_msr); | |
1017 | /* check if the cpu supports writing r/o exit information fields */ | |
1018 | if (!(vmx_msr & MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS)) | |
1019 | return false; | |
1020 | ||
1021 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
1022 | SECONDARY_EXEC_SHADOW_VMCS; | |
1023 | } | |
1024 | ||
1025 | static inline bool report_flexpriority(void) | |
1026 | { | |
1027 | return flexpriority_enabled; | |
1028 | } | |
1029 | ||
1030 | static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit) | |
1031 | { | |
1032 | return vmcs12->cpu_based_vm_exec_control & bit; | |
1033 | } | |
1034 | ||
1035 | static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit) | |
1036 | { | |
1037 | return (vmcs12->cpu_based_vm_exec_control & | |
1038 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) && | |
1039 | (vmcs12->secondary_vm_exec_control & bit); | |
1040 | } | |
1041 | ||
1042 | static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12, | |
1043 | struct kvm_vcpu *vcpu) | |
1044 | { | |
1045 | return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS; | |
1046 | } | |
1047 | ||
1048 | static inline bool is_exception(u32 intr_info) | |
1049 | { | |
1050 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) | |
1051 | == (INTR_TYPE_HARD_EXCEPTION | INTR_INFO_VALID_MASK); | |
1052 | } | |
1053 | ||
1054 | static void nested_vmx_vmexit(struct kvm_vcpu *vcpu); | |
1055 | static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu, | |
1056 | struct vmcs12 *vmcs12, | |
1057 | u32 reason, unsigned long qualification); | |
1058 | ||
1059 | static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) | |
1060 | { | |
1061 | int i; | |
1062 | ||
1063 | for (i = 0; i < vmx->nmsrs; ++i) | |
1064 | if (vmx_msr_index[vmx->guest_msrs[i].index] == msr) | |
1065 | return i; | |
1066 | return -1; | |
1067 | } | |
1068 | ||
1069 | static inline void __invvpid(int ext, u16 vpid, gva_t gva) | |
1070 | { | |
1071 | struct { | |
1072 | u64 vpid : 16; | |
1073 | u64 rsvd : 48; | |
1074 | u64 gva; | |
1075 | } operand = { vpid, 0, gva }; | |
1076 | ||
1077 | asm volatile (__ex(ASM_VMX_INVVPID) | |
1078 | /* CF==1 or ZF==1 --> rc = -1 */ | |
1079 | "; ja 1f ; ud2 ; 1:" | |
1080 | : : "a"(&operand), "c"(ext) : "cc", "memory"); | |
1081 | } | |
1082 | ||
1083 | static inline void __invept(int ext, u64 eptp, gpa_t gpa) | |
1084 | { | |
1085 | struct { | |
1086 | u64 eptp, gpa; | |
1087 | } operand = {eptp, gpa}; | |
1088 | ||
1089 | asm volatile (__ex(ASM_VMX_INVEPT) | |
1090 | /* CF==1 or ZF==1 --> rc = -1 */ | |
1091 | "; ja 1f ; ud2 ; 1:\n" | |
1092 | : : "a" (&operand), "c" (ext) : "cc", "memory"); | |
1093 | } | |
1094 | ||
1095 | static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr) | |
1096 | { | |
1097 | int i; | |
1098 | ||
1099 | i = __find_msr_index(vmx, msr); | |
1100 | if (i >= 0) | |
1101 | return &vmx->guest_msrs[i]; | |
1102 | return NULL; | |
1103 | } | |
1104 | ||
1105 | static void vmcs_clear(struct vmcs *vmcs) | |
1106 | { | |
1107 | u64 phys_addr = __pa(vmcs); | |
1108 | u8 error; | |
1109 | ||
1110 | asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0" | |
1111 | : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr) | |
1112 | : "cc", "memory"); | |
1113 | if (error) | |
1114 | printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n", | |
1115 | vmcs, phys_addr); | |
1116 | } | |
1117 | ||
1118 | static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs) | |
1119 | { | |
1120 | vmcs_clear(loaded_vmcs->vmcs); | |
1121 | loaded_vmcs->cpu = -1; | |
1122 | loaded_vmcs->launched = 0; | |
1123 | } | |
1124 | ||
1125 | static void vmcs_load(struct vmcs *vmcs) | |
1126 | { | |
1127 | u64 phys_addr = __pa(vmcs); | |
1128 | u8 error; | |
1129 | ||
1130 | asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0" | |
1131 | : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr) | |
1132 | : "cc", "memory"); | |
1133 | if (error) | |
1134 | printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n", | |
1135 | vmcs, phys_addr); | |
1136 | } | |
1137 | ||
1138 | #ifdef CONFIG_KEXEC | |
1139 | /* | |
1140 | * This bitmap is used to indicate whether the vmclear | |
1141 | * operation is enabled on all cpus. All disabled by | |
1142 | * default. | |
1143 | */ | |
1144 | static cpumask_t crash_vmclear_enabled_bitmap = CPU_MASK_NONE; | |
1145 | ||
1146 | static inline void crash_enable_local_vmclear(int cpu) | |
1147 | { | |
1148 | cpumask_set_cpu(cpu, &crash_vmclear_enabled_bitmap); | |
1149 | } | |
1150 | ||
1151 | static inline void crash_disable_local_vmclear(int cpu) | |
1152 | { | |
1153 | cpumask_clear_cpu(cpu, &crash_vmclear_enabled_bitmap); | |
1154 | } | |
1155 | ||
1156 | static inline int crash_local_vmclear_enabled(int cpu) | |
1157 | { | |
1158 | return cpumask_test_cpu(cpu, &crash_vmclear_enabled_bitmap); | |
1159 | } | |
1160 | ||
1161 | static void crash_vmclear_local_loaded_vmcss(void) | |
1162 | { | |
1163 | int cpu = raw_smp_processor_id(); | |
1164 | struct loaded_vmcs *v; | |
1165 | ||
1166 | if (!crash_local_vmclear_enabled(cpu)) | |
1167 | return; | |
1168 | ||
1169 | list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu), | |
1170 | loaded_vmcss_on_cpu_link) | |
1171 | vmcs_clear(v->vmcs); | |
1172 | } | |
1173 | #else | |
1174 | static inline void crash_enable_local_vmclear(int cpu) { } | |
1175 | static inline void crash_disable_local_vmclear(int cpu) { } | |
1176 | #endif /* CONFIG_KEXEC */ | |
1177 | ||
1178 | static void __loaded_vmcs_clear(void *arg) | |
1179 | { | |
1180 | struct loaded_vmcs *loaded_vmcs = arg; | |
1181 | int cpu = raw_smp_processor_id(); | |
1182 | ||
1183 | if (loaded_vmcs->cpu != cpu) | |
1184 | return; /* vcpu migration can race with cpu offline */ | |
1185 | if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs) | |
1186 | per_cpu(current_vmcs, cpu) = NULL; | |
1187 | crash_disable_local_vmclear(cpu); | |
1188 | list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link); | |
1189 | ||
1190 | /* | |
1191 | * we should ensure updating loaded_vmcs->loaded_vmcss_on_cpu_link | |
1192 | * is before setting loaded_vmcs->vcpu to -1 which is done in | |
1193 | * loaded_vmcs_init. Otherwise, other cpu can see vcpu = -1 fist | |
1194 | * then adds the vmcs into percpu list before it is deleted. | |
1195 | */ | |
1196 | smp_wmb(); | |
1197 | ||
1198 | loaded_vmcs_init(loaded_vmcs); | |
1199 | crash_enable_local_vmclear(cpu); | |
1200 | } | |
1201 | ||
1202 | static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs) | |
1203 | { | |
1204 | int cpu = loaded_vmcs->cpu; | |
1205 | ||
1206 | if (cpu != -1) | |
1207 | smp_call_function_single(cpu, | |
1208 | __loaded_vmcs_clear, loaded_vmcs, 1); | |
1209 | } | |
1210 | ||
1211 | static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx) | |
1212 | { | |
1213 | if (vmx->vpid == 0) | |
1214 | return; | |
1215 | ||
1216 | if (cpu_has_vmx_invvpid_single()) | |
1217 | __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0); | |
1218 | } | |
1219 | ||
1220 | static inline void vpid_sync_vcpu_global(void) | |
1221 | { | |
1222 | if (cpu_has_vmx_invvpid_global()) | |
1223 | __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0); | |
1224 | } | |
1225 | ||
1226 | static inline void vpid_sync_context(struct vcpu_vmx *vmx) | |
1227 | { | |
1228 | if (cpu_has_vmx_invvpid_single()) | |
1229 | vpid_sync_vcpu_single(vmx); | |
1230 | else | |
1231 | vpid_sync_vcpu_global(); | |
1232 | } | |
1233 | ||
1234 | static inline void ept_sync_global(void) | |
1235 | { | |
1236 | if (cpu_has_vmx_invept_global()) | |
1237 | __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0); | |
1238 | } | |
1239 | ||
1240 | static inline void ept_sync_context(u64 eptp) | |
1241 | { | |
1242 | if (enable_ept) { | |
1243 | if (cpu_has_vmx_invept_context()) | |
1244 | __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0); | |
1245 | else | |
1246 | ept_sync_global(); | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | static __always_inline unsigned long vmcs_readl(unsigned long field) | |
1251 | { | |
1252 | unsigned long value; | |
1253 | ||
1254 | asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0") | |
1255 | : "=a"(value) : "d"(field) : "cc"); | |
1256 | return value; | |
1257 | } | |
1258 | ||
1259 | static __always_inline u16 vmcs_read16(unsigned long field) | |
1260 | { | |
1261 | return vmcs_readl(field); | |
1262 | } | |
1263 | ||
1264 | static __always_inline u32 vmcs_read32(unsigned long field) | |
1265 | { | |
1266 | return vmcs_readl(field); | |
1267 | } | |
1268 | ||
1269 | static __always_inline u64 vmcs_read64(unsigned long field) | |
1270 | { | |
1271 | #ifdef CONFIG_X86_64 | |
1272 | return vmcs_readl(field); | |
1273 | #else | |
1274 | return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32); | |
1275 | #endif | |
1276 | } | |
1277 | ||
1278 | static noinline void vmwrite_error(unsigned long field, unsigned long value) | |
1279 | { | |
1280 | printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", | |
1281 | field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); | |
1282 | dump_stack(); | |
1283 | } | |
1284 | ||
1285 | static void vmcs_writel(unsigned long field, unsigned long value) | |
1286 | { | |
1287 | u8 error; | |
1288 | ||
1289 | asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0" | |
1290 | : "=q"(error) : "a"(value), "d"(field) : "cc"); | |
1291 | if (unlikely(error)) | |
1292 | vmwrite_error(field, value); | |
1293 | } | |
1294 | ||
1295 | static void vmcs_write16(unsigned long field, u16 value) | |
1296 | { | |
1297 | vmcs_writel(field, value); | |
1298 | } | |
1299 | ||
1300 | static void vmcs_write32(unsigned long field, u32 value) | |
1301 | { | |
1302 | vmcs_writel(field, value); | |
1303 | } | |
1304 | ||
1305 | static void vmcs_write64(unsigned long field, u64 value) | |
1306 | { | |
1307 | vmcs_writel(field, value); | |
1308 | #ifndef CONFIG_X86_64 | |
1309 | asm volatile (""); | |
1310 | vmcs_writel(field+1, value >> 32); | |
1311 | #endif | |
1312 | } | |
1313 | ||
1314 | static void vmcs_clear_bits(unsigned long field, u32 mask) | |
1315 | { | |
1316 | vmcs_writel(field, vmcs_readl(field) & ~mask); | |
1317 | } | |
1318 | ||
1319 | static void vmcs_set_bits(unsigned long field, u32 mask) | |
1320 | { | |
1321 | vmcs_writel(field, vmcs_readl(field) | mask); | |
1322 | } | |
1323 | ||
1324 | static void vmx_segment_cache_clear(struct vcpu_vmx *vmx) | |
1325 | { | |
1326 | vmx->segment_cache.bitmask = 0; | |
1327 | } | |
1328 | ||
1329 | static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg, | |
1330 | unsigned field) | |
1331 | { | |
1332 | bool ret; | |
1333 | u32 mask = 1 << (seg * SEG_FIELD_NR + field); | |
1334 | ||
1335 | if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) { | |
1336 | vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS); | |
1337 | vmx->segment_cache.bitmask = 0; | |
1338 | } | |
1339 | ret = vmx->segment_cache.bitmask & mask; | |
1340 | vmx->segment_cache.bitmask |= mask; | |
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg) | |
1345 | { | |
1346 | u16 *p = &vmx->segment_cache.seg[seg].selector; | |
1347 | ||
1348 | if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL)) | |
1349 | *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector); | |
1350 | return *p; | |
1351 | } | |
1352 | ||
1353 | static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg) | |
1354 | { | |
1355 | ulong *p = &vmx->segment_cache.seg[seg].base; | |
1356 | ||
1357 | if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE)) | |
1358 | *p = vmcs_readl(kvm_vmx_segment_fields[seg].base); | |
1359 | return *p; | |
1360 | } | |
1361 | ||
1362 | static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg) | |
1363 | { | |
1364 | u32 *p = &vmx->segment_cache.seg[seg].limit; | |
1365 | ||
1366 | if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT)) | |
1367 | *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit); | |
1368 | return *p; | |
1369 | } | |
1370 | ||
1371 | static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg) | |
1372 | { | |
1373 | u32 *p = &vmx->segment_cache.seg[seg].ar; | |
1374 | ||
1375 | if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR)) | |
1376 | *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes); | |
1377 | return *p; | |
1378 | } | |
1379 | ||
1380 | static void update_exception_bitmap(struct kvm_vcpu *vcpu) | |
1381 | { | |
1382 | u32 eb; | |
1383 | ||
1384 | eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) | | |
1385 | (1u << NM_VECTOR) | (1u << DB_VECTOR); | |
1386 | if ((vcpu->guest_debug & | |
1387 | (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) == | |
1388 | (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) | |
1389 | eb |= 1u << BP_VECTOR; | |
1390 | if (to_vmx(vcpu)->rmode.vm86_active) | |
1391 | eb = ~0; | |
1392 | if (enable_ept) | |
1393 | eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */ | |
1394 | if (vcpu->fpu_active) | |
1395 | eb &= ~(1u << NM_VECTOR); | |
1396 | ||
1397 | /* When we are running a nested L2 guest and L1 specified for it a | |
1398 | * certain exception bitmap, we must trap the same exceptions and pass | |
1399 | * them to L1. When running L2, we will only handle the exceptions | |
1400 | * specified above if L1 did not want them. | |
1401 | */ | |
1402 | if (is_guest_mode(vcpu)) | |
1403 | eb |= get_vmcs12(vcpu)->exception_bitmap; | |
1404 | ||
1405 | vmcs_write32(EXCEPTION_BITMAP, eb); | |
1406 | } | |
1407 | ||
1408 | static void clear_atomic_switch_msr_special(unsigned long entry, | |
1409 | unsigned long exit) | |
1410 | { | |
1411 | vmcs_clear_bits(VM_ENTRY_CONTROLS, entry); | |
1412 | vmcs_clear_bits(VM_EXIT_CONTROLS, exit); | |
1413 | } | |
1414 | ||
1415 | static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr) | |
1416 | { | |
1417 | unsigned i; | |
1418 | struct msr_autoload *m = &vmx->msr_autoload; | |
1419 | ||
1420 | switch (msr) { | |
1421 | case MSR_EFER: | |
1422 | if (cpu_has_load_ia32_efer) { | |
1423 | clear_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER, | |
1424 | VM_EXIT_LOAD_IA32_EFER); | |
1425 | return; | |
1426 | } | |
1427 | break; | |
1428 | case MSR_CORE_PERF_GLOBAL_CTRL: | |
1429 | if (cpu_has_load_perf_global_ctrl) { | |
1430 | clear_atomic_switch_msr_special( | |
1431 | VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, | |
1432 | VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); | |
1433 | return; | |
1434 | } | |
1435 | break; | |
1436 | } | |
1437 | ||
1438 | for (i = 0; i < m->nr; ++i) | |
1439 | if (m->guest[i].index == msr) | |
1440 | break; | |
1441 | ||
1442 | if (i == m->nr) | |
1443 | return; | |
1444 | --m->nr; | |
1445 | m->guest[i] = m->guest[m->nr]; | |
1446 | m->host[i] = m->host[m->nr]; | |
1447 | vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr); | |
1448 | vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr); | |
1449 | } | |
1450 | ||
1451 | static void add_atomic_switch_msr_special(unsigned long entry, | |
1452 | unsigned long exit, unsigned long guest_val_vmcs, | |
1453 | unsigned long host_val_vmcs, u64 guest_val, u64 host_val) | |
1454 | { | |
1455 | vmcs_write64(guest_val_vmcs, guest_val); | |
1456 | vmcs_write64(host_val_vmcs, host_val); | |
1457 | vmcs_set_bits(VM_ENTRY_CONTROLS, entry); | |
1458 | vmcs_set_bits(VM_EXIT_CONTROLS, exit); | |
1459 | } | |
1460 | ||
1461 | static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, | |
1462 | u64 guest_val, u64 host_val) | |
1463 | { | |
1464 | unsigned i; | |
1465 | struct msr_autoload *m = &vmx->msr_autoload; | |
1466 | ||
1467 | switch (msr) { | |
1468 | case MSR_EFER: | |
1469 | if (cpu_has_load_ia32_efer) { | |
1470 | add_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER, | |
1471 | VM_EXIT_LOAD_IA32_EFER, | |
1472 | GUEST_IA32_EFER, | |
1473 | HOST_IA32_EFER, | |
1474 | guest_val, host_val); | |
1475 | return; | |
1476 | } | |
1477 | break; | |
1478 | case MSR_CORE_PERF_GLOBAL_CTRL: | |
1479 | if (cpu_has_load_perf_global_ctrl) { | |
1480 | add_atomic_switch_msr_special( | |
1481 | VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL, | |
1482 | VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL, | |
1483 | GUEST_IA32_PERF_GLOBAL_CTRL, | |
1484 | HOST_IA32_PERF_GLOBAL_CTRL, | |
1485 | guest_val, host_val); | |
1486 | return; | |
1487 | } | |
1488 | break; | |
1489 | } | |
1490 | ||
1491 | for (i = 0; i < m->nr; ++i) | |
1492 | if (m->guest[i].index == msr) | |
1493 | break; | |
1494 | ||
1495 | if (i == NR_AUTOLOAD_MSRS) { | |
1496 | printk_once(KERN_WARNING"Not enough mst switch entries. " | |
1497 | "Can't add msr %x\n", msr); | |
1498 | return; | |
1499 | } else if (i == m->nr) { | |
1500 | ++m->nr; | |
1501 | vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr); | |
1502 | vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr); | |
1503 | } | |
1504 | ||
1505 | m->guest[i].index = msr; | |
1506 | m->guest[i].value = guest_val; | |
1507 | m->host[i].index = msr; | |
1508 | m->host[i].value = host_val; | |
1509 | } | |
1510 | ||
1511 | static void reload_tss(void) | |
1512 | { | |
1513 | /* | |
1514 | * VT restores TR but not its size. Useless. | |
1515 | */ | |
1516 | struct desc_ptr *gdt = &__get_cpu_var(host_gdt); | |
1517 | struct desc_struct *descs; | |
1518 | ||
1519 | descs = (void *)gdt->address; | |
1520 | descs[GDT_ENTRY_TSS].type = 9; /* available TSS */ | |
1521 | load_TR_desc(); | |
1522 | } | |
1523 | ||
1524 | static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) | |
1525 | { | |
1526 | u64 guest_efer; | |
1527 | u64 ignore_bits; | |
1528 | ||
1529 | guest_efer = vmx->vcpu.arch.efer; | |
1530 | ||
1531 | /* | |
1532 | * NX is emulated; LMA and LME handled by hardware; SCE meaningless | |
1533 | * outside long mode | |
1534 | */ | |
1535 | ignore_bits = EFER_NX | EFER_SCE; | |
1536 | #ifdef CONFIG_X86_64 | |
1537 | ignore_bits |= EFER_LMA | EFER_LME; | |
1538 | /* SCE is meaningful only in long mode on Intel */ | |
1539 | if (guest_efer & EFER_LMA) | |
1540 | ignore_bits &= ~(u64)EFER_SCE; | |
1541 | #endif | |
1542 | guest_efer &= ~ignore_bits; | |
1543 | guest_efer |= host_efer & ignore_bits; | |
1544 | vmx->guest_msrs[efer_offset].data = guest_efer; | |
1545 | vmx->guest_msrs[efer_offset].mask = ~ignore_bits; | |
1546 | ||
1547 | clear_atomic_switch_msr(vmx, MSR_EFER); | |
1548 | /* On ept, can't emulate nx, and must switch nx atomically */ | |
1549 | if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) { | |
1550 | guest_efer = vmx->vcpu.arch.efer; | |
1551 | if (!(guest_efer & EFER_LMA)) | |
1552 | guest_efer &= ~EFER_LME; | |
1553 | add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer); | |
1554 | return false; | |
1555 | } | |
1556 | ||
1557 | return true; | |
1558 | } | |
1559 | ||
1560 | static unsigned long segment_base(u16 selector) | |
1561 | { | |
1562 | struct desc_ptr *gdt = &__get_cpu_var(host_gdt); | |
1563 | struct desc_struct *d; | |
1564 | unsigned long table_base; | |
1565 | unsigned long v; | |
1566 | ||
1567 | if (!(selector & ~3)) | |
1568 | return 0; | |
1569 | ||
1570 | table_base = gdt->address; | |
1571 | ||
1572 | if (selector & 4) { /* from ldt */ | |
1573 | u16 ldt_selector = kvm_read_ldt(); | |
1574 | ||
1575 | if (!(ldt_selector & ~3)) | |
1576 | return 0; | |
1577 | ||
1578 | table_base = segment_base(ldt_selector); | |
1579 | } | |
1580 | d = (struct desc_struct *)(table_base + (selector & ~7)); | |
1581 | v = get_desc_base(d); | |
1582 | #ifdef CONFIG_X86_64 | |
1583 | if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) | |
1584 | v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32; | |
1585 | #endif | |
1586 | return v; | |
1587 | } | |
1588 | ||
1589 | static inline unsigned long kvm_read_tr_base(void) | |
1590 | { | |
1591 | u16 tr; | |
1592 | asm("str %0" : "=g"(tr)); | |
1593 | return segment_base(tr); | |
1594 | } | |
1595 | ||
1596 | static void vmx_save_host_state(struct kvm_vcpu *vcpu) | |
1597 | { | |
1598 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1599 | int i; | |
1600 | ||
1601 | if (vmx->host_state.loaded) | |
1602 | return; | |
1603 | ||
1604 | vmx->host_state.loaded = 1; | |
1605 | /* | |
1606 | * Set host fs and gs selectors. Unfortunately, 22.2.3 does not | |
1607 | * allow segment selectors with cpl > 0 or ti == 1. | |
1608 | */ | |
1609 | vmx->host_state.ldt_sel = kvm_read_ldt(); | |
1610 | vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel; | |
1611 | savesegment(fs, vmx->host_state.fs_sel); | |
1612 | if (!(vmx->host_state.fs_sel & 7)) { | |
1613 | vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel); | |
1614 | vmx->host_state.fs_reload_needed = 0; | |
1615 | } else { | |
1616 | vmcs_write16(HOST_FS_SELECTOR, 0); | |
1617 | vmx->host_state.fs_reload_needed = 1; | |
1618 | } | |
1619 | savesegment(gs, vmx->host_state.gs_sel); | |
1620 | if (!(vmx->host_state.gs_sel & 7)) | |
1621 | vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel); | |
1622 | else { | |
1623 | vmcs_write16(HOST_GS_SELECTOR, 0); | |
1624 | vmx->host_state.gs_ldt_reload_needed = 1; | |
1625 | } | |
1626 | ||
1627 | #ifdef CONFIG_X86_64 | |
1628 | savesegment(ds, vmx->host_state.ds_sel); | |
1629 | savesegment(es, vmx->host_state.es_sel); | |
1630 | #endif | |
1631 | ||
1632 | #ifdef CONFIG_X86_64 | |
1633 | vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE)); | |
1634 | vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE)); | |
1635 | #else | |
1636 | vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel)); | |
1637 | vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel)); | |
1638 | #endif | |
1639 | ||
1640 | #ifdef CONFIG_X86_64 | |
1641 | rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); | |
1642 | if (is_long_mode(&vmx->vcpu)) | |
1643 | wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); | |
1644 | #endif | |
1645 | for (i = 0; i < vmx->save_nmsrs; ++i) | |
1646 | kvm_set_shared_msr(vmx->guest_msrs[i].index, | |
1647 | vmx->guest_msrs[i].data, | |
1648 | vmx->guest_msrs[i].mask); | |
1649 | } | |
1650 | ||
1651 | static void __vmx_load_host_state(struct vcpu_vmx *vmx) | |
1652 | { | |
1653 | if (!vmx->host_state.loaded) | |
1654 | return; | |
1655 | ||
1656 | ++vmx->vcpu.stat.host_state_reload; | |
1657 | vmx->host_state.loaded = 0; | |
1658 | #ifdef CONFIG_X86_64 | |
1659 | if (is_long_mode(&vmx->vcpu)) | |
1660 | rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); | |
1661 | #endif | |
1662 | if (vmx->host_state.gs_ldt_reload_needed) { | |
1663 | kvm_load_ldt(vmx->host_state.ldt_sel); | |
1664 | #ifdef CONFIG_X86_64 | |
1665 | load_gs_index(vmx->host_state.gs_sel); | |
1666 | #else | |
1667 | loadsegment(gs, vmx->host_state.gs_sel); | |
1668 | #endif | |
1669 | } | |
1670 | if (vmx->host_state.fs_reload_needed) | |
1671 | loadsegment(fs, vmx->host_state.fs_sel); | |
1672 | #ifdef CONFIG_X86_64 | |
1673 | if (unlikely(vmx->host_state.ds_sel | vmx->host_state.es_sel)) { | |
1674 | loadsegment(ds, vmx->host_state.ds_sel); | |
1675 | loadsegment(es, vmx->host_state.es_sel); | |
1676 | } | |
1677 | #endif | |
1678 | reload_tss(); | |
1679 | #ifdef CONFIG_X86_64 | |
1680 | wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); | |
1681 | #endif | |
1682 | /* | |
1683 | * If the FPU is not active (through the host task or | |
1684 | * the guest vcpu), then restore the cr0.TS bit. | |
1685 | */ | |
1686 | if (!user_has_fpu() && !vmx->vcpu.guest_fpu_loaded) | |
1687 | stts(); | |
1688 | load_gdt(&__get_cpu_var(host_gdt)); | |
1689 | } | |
1690 | ||
1691 | static void vmx_load_host_state(struct vcpu_vmx *vmx) | |
1692 | { | |
1693 | preempt_disable(); | |
1694 | __vmx_load_host_state(vmx); | |
1695 | preempt_enable(); | |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | * Switches to specified vcpu, until a matching vcpu_put(), but assumes | |
1700 | * vcpu mutex is already taken. | |
1701 | */ | |
1702 | static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
1703 | { | |
1704 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1705 | u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); | |
1706 | ||
1707 | if (!vmm_exclusive) | |
1708 | kvm_cpu_vmxon(phys_addr); | |
1709 | else if (vmx->loaded_vmcs->cpu != cpu) | |
1710 | loaded_vmcs_clear(vmx->loaded_vmcs); | |
1711 | ||
1712 | if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) { | |
1713 | per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs; | |
1714 | vmcs_load(vmx->loaded_vmcs->vmcs); | |
1715 | } | |
1716 | ||
1717 | if (vmx->loaded_vmcs->cpu != cpu) { | |
1718 | struct desc_ptr *gdt = &__get_cpu_var(host_gdt); | |
1719 | unsigned long sysenter_esp; | |
1720 | ||
1721 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); | |
1722 | local_irq_disable(); | |
1723 | crash_disable_local_vmclear(cpu); | |
1724 | ||
1725 | /* | |
1726 | * Read loaded_vmcs->cpu should be before fetching | |
1727 | * loaded_vmcs->loaded_vmcss_on_cpu_link. | |
1728 | * See the comments in __loaded_vmcs_clear(). | |
1729 | */ | |
1730 | smp_rmb(); | |
1731 | ||
1732 | list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link, | |
1733 | &per_cpu(loaded_vmcss_on_cpu, cpu)); | |
1734 | crash_enable_local_vmclear(cpu); | |
1735 | local_irq_enable(); | |
1736 | ||
1737 | /* | |
1738 | * Linux uses per-cpu TSS and GDT, so set these when switching | |
1739 | * processors. | |
1740 | */ | |
1741 | vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */ | |
1742 | vmcs_writel(HOST_GDTR_BASE, gdt->address); /* 22.2.4 */ | |
1743 | ||
1744 | rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); | |
1745 | vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ | |
1746 | vmx->loaded_vmcs->cpu = cpu; | |
1747 | } | |
1748 | } | |
1749 | ||
1750 | static void vmx_vcpu_put(struct kvm_vcpu *vcpu) | |
1751 | { | |
1752 | __vmx_load_host_state(to_vmx(vcpu)); | |
1753 | if (!vmm_exclusive) { | |
1754 | __loaded_vmcs_clear(to_vmx(vcpu)->loaded_vmcs); | |
1755 | vcpu->cpu = -1; | |
1756 | kvm_cpu_vmxoff(); | |
1757 | } | |
1758 | } | |
1759 | ||
1760 | static void vmx_fpu_activate(struct kvm_vcpu *vcpu) | |
1761 | { | |
1762 | ulong cr0; | |
1763 | ||
1764 | if (vcpu->fpu_active) | |
1765 | return; | |
1766 | vcpu->fpu_active = 1; | |
1767 | cr0 = vmcs_readl(GUEST_CR0); | |
1768 | cr0 &= ~(X86_CR0_TS | X86_CR0_MP); | |
1769 | cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP); | |
1770 | vmcs_writel(GUEST_CR0, cr0); | |
1771 | update_exception_bitmap(vcpu); | |
1772 | vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS; | |
1773 | if (is_guest_mode(vcpu)) | |
1774 | vcpu->arch.cr0_guest_owned_bits &= | |
1775 | ~get_vmcs12(vcpu)->cr0_guest_host_mask; | |
1776 | vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); | |
1777 | } | |
1778 | ||
1779 | static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu); | |
1780 | ||
1781 | /* | |
1782 | * Return the cr0 value that a nested guest would read. This is a combination | |
1783 | * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by | |
1784 | * its hypervisor (cr0_read_shadow). | |
1785 | */ | |
1786 | static inline unsigned long nested_read_cr0(struct vmcs12 *fields) | |
1787 | { | |
1788 | return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) | | |
1789 | (fields->cr0_read_shadow & fields->cr0_guest_host_mask); | |
1790 | } | |
1791 | static inline unsigned long nested_read_cr4(struct vmcs12 *fields) | |
1792 | { | |
1793 | return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) | | |
1794 | (fields->cr4_read_shadow & fields->cr4_guest_host_mask); | |
1795 | } | |
1796 | ||
1797 | static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu) | |
1798 | { | |
1799 | /* Note that there is no vcpu->fpu_active = 0 here. The caller must | |
1800 | * set this *before* calling this function. | |
1801 | */ | |
1802 | vmx_decache_cr0_guest_bits(vcpu); | |
1803 | vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP); | |
1804 | update_exception_bitmap(vcpu); | |
1805 | vcpu->arch.cr0_guest_owned_bits = 0; | |
1806 | vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); | |
1807 | if (is_guest_mode(vcpu)) { | |
1808 | /* | |
1809 | * L1's specified read shadow might not contain the TS bit, | |
1810 | * so now that we turned on shadowing of this bit, we need to | |
1811 | * set this bit of the shadow. Like in nested_vmx_run we need | |
1812 | * nested_read_cr0(vmcs12), but vmcs12->guest_cr0 is not yet | |
1813 | * up-to-date here because we just decached cr0.TS (and we'll | |
1814 | * only update vmcs12->guest_cr0 on nested exit). | |
1815 | */ | |
1816 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
1817 | vmcs12->guest_cr0 = (vmcs12->guest_cr0 & ~X86_CR0_TS) | | |
1818 | (vcpu->arch.cr0 & X86_CR0_TS); | |
1819 | vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12)); | |
1820 | } else | |
1821 | vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0); | |
1822 | } | |
1823 | ||
1824 | static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) | |
1825 | { | |
1826 | unsigned long rflags, save_rflags; | |
1827 | ||
1828 | if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) { | |
1829 | __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail); | |
1830 | rflags = vmcs_readl(GUEST_RFLAGS); | |
1831 | if (to_vmx(vcpu)->rmode.vm86_active) { | |
1832 | rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS; | |
1833 | save_rflags = to_vmx(vcpu)->rmode.save_rflags; | |
1834 | rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; | |
1835 | } | |
1836 | to_vmx(vcpu)->rflags = rflags; | |
1837 | } | |
1838 | return to_vmx(vcpu)->rflags; | |
1839 | } | |
1840 | ||
1841 | static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) | |
1842 | { | |
1843 | __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail); | |
1844 | to_vmx(vcpu)->rflags = rflags; | |
1845 | if (to_vmx(vcpu)->rmode.vm86_active) { | |
1846 | to_vmx(vcpu)->rmode.save_rflags = rflags; | |
1847 | rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; | |
1848 | } | |
1849 | vmcs_writel(GUEST_RFLAGS, rflags); | |
1850 | } | |
1851 | ||
1852 | static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) | |
1853 | { | |
1854 | u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); | |
1855 | int ret = 0; | |
1856 | ||
1857 | if (interruptibility & GUEST_INTR_STATE_STI) | |
1858 | ret |= KVM_X86_SHADOW_INT_STI; | |
1859 | if (interruptibility & GUEST_INTR_STATE_MOV_SS) | |
1860 | ret |= KVM_X86_SHADOW_INT_MOV_SS; | |
1861 | ||
1862 | return ret & mask; | |
1863 | } | |
1864 | ||
1865 | static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) | |
1866 | { | |
1867 | u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); | |
1868 | u32 interruptibility = interruptibility_old; | |
1869 | ||
1870 | interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS); | |
1871 | ||
1872 | if (mask & KVM_X86_SHADOW_INT_MOV_SS) | |
1873 | interruptibility |= GUEST_INTR_STATE_MOV_SS; | |
1874 | else if (mask & KVM_X86_SHADOW_INT_STI) | |
1875 | interruptibility |= GUEST_INTR_STATE_STI; | |
1876 | ||
1877 | if ((interruptibility != interruptibility_old)) | |
1878 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility); | |
1879 | } | |
1880 | ||
1881 | static void skip_emulated_instruction(struct kvm_vcpu *vcpu) | |
1882 | { | |
1883 | unsigned long rip; | |
1884 | ||
1885 | rip = kvm_rip_read(vcpu); | |
1886 | rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
1887 | kvm_rip_write(vcpu, rip); | |
1888 | ||
1889 | /* skipping an emulated instruction also counts */ | |
1890 | vmx_set_interrupt_shadow(vcpu, 0); | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * KVM wants to inject page-faults which it got to the guest. This function | |
1895 | * checks whether in a nested guest, we need to inject them to L1 or L2. | |
1896 | * This function assumes it is called with the exit reason in vmcs02 being | |
1897 | * a #PF exception (this is the only case in which KVM injects a #PF when L2 | |
1898 | * is running). | |
1899 | */ | |
1900 | static int nested_pf_handled(struct kvm_vcpu *vcpu) | |
1901 | { | |
1902 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
1903 | ||
1904 | /* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */ | |
1905 | if (!(vmcs12->exception_bitmap & (1u << PF_VECTOR))) | |
1906 | return 0; | |
1907 | ||
1908 | nested_vmx_vmexit(vcpu); | |
1909 | return 1; | |
1910 | } | |
1911 | ||
1912 | static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr, | |
1913 | bool has_error_code, u32 error_code, | |
1914 | bool reinject) | |
1915 | { | |
1916 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1917 | u32 intr_info = nr | INTR_INFO_VALID_MASK; | |
1918 | ||
1919 | if (nr == PF_VECTOR && is_guest_mode(vcpu) && | |
1920 | nested_pf_handled(vcpu)) | |
1921 | return; | |
1922 | ||
1923 | if (has_error_code) { | |
1924 | vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); | |
1925 | intr_info |= INTR_INFO_DELIVER_CODE_MASK; | |
1926 | } | |
1927 | ||
1928 | if (vmx->rmode.vm86_active) { | |
1929 | int inc_eip = 0; | |
1930 | if (kvm_exception_is_soft(nr)) | |
1931 | inc_eip = vcpu->arch.event_exit_inst_len; | |
1932 | if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE) | |
1933 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); | |
1934 | return; | |
1935 | } | |
1936 | ||
1937 | if (kvm_exception_is_soft(nr)) { | |
1938 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, | |
1939 | vmx->vcpu.arch.event_exit_inst_len); | |
1940 | intr_info |= INTR_TYPE_SOFT_EXCEPTION; | |
1941 | } else | |
1942 | intr_info |= INTR_TYPE_HARD_EXCEPTION; | |
1943 | ||
1944 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); | |
1945 | } | |
1946 | ||
1947 | static bool vmx_rdtscp_supported(void) | |
1948 | { | |
1949 | return cpu_has_vmx_rdtscp(); | |
1950 | } | |
1951 | ||
1952 | static bool vmx_invpcid_supported(void) | |
1953 | { | |
1954 | return cpu_has_vmx_invpcid() && enable_ept; | |
1955 | } | |
1956 | ||
1957 | /* | |
1958 | * Swap MSR entry in host/guest MSR entry array. | |
1959 | */ | |
1960 | static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) | |
1961 | { | |
1962 | struct shared_msr_entry tmp; | |
1963 | ||
1964 | tmp = vmx->guest_msrs[to]; | |
1965 | vmx->guest_msrs[to] = vmx->guest_msrs[from]; | |
1966 | vmx->guest_msrs[from] = tmp; | |
1967 | } | |
1968 | ||
1969 | static void vmx_set_msr_bitmap(struct kvm_vcpu *vcpu) | |
1970 | { | |
1971 | unsigned long *msr_bitmap; | |
1972 | ||
1973 | if (irqchip_in_kernel(vcpu->kvm) && apic_x2apic_mode(vcpu->arch.apic)) { | |
1974 | if (is_long_mode(vcpu)) | |
1975 | msr_bitmap = vmx_msr_bitmap_longmode_x2apic; | |
1976 | else | |
1977 | msr_bitmap = vmx_msr_bitmap_legacy_x2apic; | |
1978 | } else { | |
1979 | if (is_long_mode(vcpu)) | |
1980 | msr_bitmap = vmx_msr_bitmap_longmode; | |
1981 | else | |
1982 | msr_bitmap = vmx_msr_bitmap_legacy; | |
1983 | } | |
1984 | ||
1985 | vmcs_write64(MSR_BITMAP, __pa(msr_bitmap)); | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Set up the vmcs to automatically save and restore system | |
1990 | * msrs. Don't touch the 64-bit msrs if the guest is in legacy | |
1991 | * mode, as fiddling with msrs is very expensive. | |
1992 | */ | |
1993 | static void setup_msrs(struct vcpu_vmx *vmx) | |
1994 | { | |
1995 | int save_nmsrs, index; | |
1996 | ||
1997 | save_nmsrs = 0; | |
1998 | #ifdef CONFIG_X86_64 | |
1999 | if (is_long_mode(&vmx->vcpu)) { | |
2000 | index = __find_msr_index(vmx, MSR_SYSCALL_MASK); | |
2001 | if (index >= 0) | |
2002 | move_msr_up(vmx, index, save_nmsrs++); | |
2003 | index = __find_msr_index(vmx, MSR_LSTAR); | |
2004 | if (index >= 0) | |
2005 | move_msr_up(vmx, index, save_nmsrs++); | |
2006 | index = __find_msr_index(vmx, MSR_CSTAR); | |
2007 | if (index >= 0) | |
2008 | move_msr_up(vmx, index, save_nmsrs++); | |
2009 | index = __find_msr_index(vmx, MSR_TSC_AUX); | |
2010 | if (index >= 0 && vmx->rdtscp_enabled) | |
2011 | move_msr_up(vmx, index, save_nmsrs++); | |
2012 | /* | |
2013 | * MSR_STAR is only needed on long mode guests, and only | |
2014 | * if efer.sce is enabled. | |
2015 | */ | |
2016 | index = __find_msr_index(vmx, MSR_STAR); | |
2017 | if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE)) | |
2018 | move_msr_up(vmx, index, save_nmsrs++); | |
2019 | } | |
2020 | #endif | |
2021 | index = __find_msr_index(vmx, MSR_EFER); | |
2022 | if (index >= 0 && update_transition_efer(vmx, index)) | |
2023 | move_msr_up(vmx, index, save_nmsrs++); | |
2024 | ||
2025 | vmx->save_nmsrs = save_nmsrs; | |
2026 | ||
2027 | if (cpu_has_vmx_msr_bitmap()) | |
2028 | vmx_set_msr_bitmap(&vmx->vcpu); | |
2029 | } | |
2030 | ||
2031 | /* | |
2032 | * reads and returns guest's timestamp counter "register" | |
2033 | * guest_tsc = host_tsc + tsc_offset -- 21.3 | |
2034 | */ | |
2035 | static u64 guest_read_tsc(void) | |
2036 | { | |
2037 | u64 host_tsc, tsc_offset; | |
2038 | ||
2039 | rdtscll(host_tsc); | |
2040 | tsc_offset = vmcs_read64(TSC_OFFSET); | |
2041 | return host_tsc + tsc_offset; | |
2042 | } | |
2043 | ||
2044 | /* | |
2045 | * Like guest_read_tsc, but always returns L1's notion of the timestamp | |
2046 | * counter, even if a nested guest (L2) is currently running. | |
2047 | */ | |
2048 | u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc) | |
2049 | { | |
2050 | u64 tsc_offset; | |
2051 | ||
2052 | tsc_offset = is_guest_mode(vcpu) ? | |
2053 | to_vmx(vcpu)->nested.vmcs01_tsc_offset : | |
2054 | vmcs_read64(TSC_OFFSET); | |
2055 | return host_tsc + tsc_offset; | |
2056 | } | |
2057 | ||
2058 | /* | |
2059 | * Engage any workarounds for mis-matched TSC rates. Currently limited to | |
2060 | * software catchup for faster rates on slower CPUs. | |
2061 | */ | |
2062 | static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale) | |
2063 | { | |
2064 | if (!scale) | |
2065 | return; | |
2066 | ||
2067 | if (user_tsc_khz > tsc_khz) { | |
2068 | vcpu->arch.tsc_catchup = 1; | |
2069 | vcpu->arch.tsc_always_catchup = 1; | |
2070 | } else | |
2071 | WARN(1, "user requested TSC rate below hardware speed\n"); | |
2072 | } | |
2073 | ||
2074 | static u64 vmx_read_tsc_offset(struct kvm_vcpu *vcpu) | |
2075 | { | |
2076 | return vmcs_read64(TSC_OFFSET); | |
2077 | } | |
2078 | ||
2079 | /* | |
2080 | * writes 'offset' into guest's timestamp counter offset register | |
2081 | */ | |
2082 | static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) | |
2083 | { | |
2084 | if (is_guest_mode(vcpu)) { | |
2085 | /* | |
2086 | * We're here if L1 chose not to trap WRMSR to TSC. According | |
2087 | * to the spec, this should set L1's TSC; The offset that L1 | |
2088 | * set for L2 remains unchanged, and still needs to be added | |
2089 | * to the newly set TSC to get L2's TSC. | |
2090 | */ | |
2091 | struct vmcs12 *vmcs12; | |
2092 | to_vmx(vcpu)->nested.vmcs01_tsc_offset = offset; | |
2093 | /* recalculate vmcs02.TSC_OFFSET: */ | |
2094 | vmcs12 = get_vmcs12(vcpu); | |
2095 | vmcs_write64(TSC_OFFSET, offset + | |
2096 | (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ? | |
2097 | vmcs12->tsc_offset : 0)); | |
2098 | } else { | |
2099 | vmcs_write64(TSC_OFFSET, offset); | |
2100 | } | |
2101 | } | |
2102 | ||
2103 | static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host) | |
2104 | { | |
2105 | u64 offset = vmcs_read64(TSC_OFFSET); | |
2106 | vmcs_write64(TSC_OFFSET, offset + adjustment); | |
2107 | if (is_guest_mode(vcpu)) { | |
2108 | /* Even when running L2, the adjustment needs to apply to L1 */ | |
2109 | to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) | |
2114 | { | |
2115 | return target_tsc - native_read_tsc(); | |
2116 | } | |
2117 | ||
2118 | static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu) | |
2119 | { | |
2120 | struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
2121 | return best && (best->ecx & (1 << (X86_FEATURE_VMX & 31))); | |
2122 | } | |
2123 | ||
2124 | /* | |
2125 | * nested_vmx_allowed() checks whether a guest should be allowed to use VMX | |
2126 | * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for | |
2127 | * all guests if the "nested" module option is off, and can also be disabled | |
2128 | * for a single guest by disabling its VMX cpuid bit. | |
2129 | */ | |
2130 | static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu) | |
2131 | { | |
2132 | return nested && guest_cpuid_has_vmx(vcpu); | |
2133 | } | |
2134 | ||
2135 | /* | |
2136 | * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be | |
2137 | * returned for the various VMX controls MSRs when nested VMX is enabled. | |
2138 | * The same values should also be used to verify that vmcs12 control fields are | |
2139 | * valid during nested entry from L1 to L2. | |
2140 | * Each of these control msrs has a low and high 32-bit half: A low bit is on | |
2141 | * if the corresponding bit in the (32-bit) control field *must* be on, and a | |
2142 | * bit in the high half is on if the corresponding bit in the control field | |
2143 | * may be on. See also vmx_control_verify(). | |
2144 | * TODO: allow these variables to be modified (downgraded) by module options | |
2145 | * or other means. | |
2146 | */ | |
2147 | static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high; | |
2148 | static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high; | |
2149 | static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high; | |
2150 | static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high; | |
2151 | static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high; | |
2152 | static u32 nested_vmx_misc_low, nested_vmx_misc_high; | |
2153 | static __init void nested_vmx_setup_ctls_msrs(void) | |
2154 | { | |
2155 | /* | |
2156 | * Note that as a general rule, the high half of the MSRs (bits in | |
2157 | * the control fields which may be 1) should be initialized by the | |
2158 | * intersection of the underlying hardware's MSR (i.e., features which | |
2159 | * can be supported) and the list of features we want to expose - | |
2160 | * because they are known to be properly supported in our code. | |
2161 | * Also, usually, the low half of the MSRs (bits which must be 1) can | |
2162 | * be set to 0, meaning that L1 may turn off any of these bits. The | |
2163 | * reason is that if one of these bits is necessary, it will appear | |
2164 | * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control | |
2165 | * fields of vmcs01 and vmcs02, will turn these bits off - and | |
2166 | * nested_vmx_exit_handled() will not pass related exits to L1. | |
2167 | * These rules have exceptions below. | |
2168 | */ | |
2169 | ||
2170 | /* pin-based controls */ | |
2171 | rdmsr(MSR_IA32_VMX_PINBASED_CTLS, | |
2172 | nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high); | |
2173 | /* | |
2174 | * According to the Intel spec, if bit 55 of VMX_BASIC is off (as it is | |
2175 | * in our case), bits 1, 2 and 4 (i.e., 0x16) must be 1 in this MSR. | |
2176 | */ | |
2177 | nested_vmx_pinbased_ctls_low |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR; | |
2178 | nested_vmx_pinbased_ctls_high &= PIN_BASED_EXT_INTR_MASK | | |
2179 | PIN_BASED_NMI_EXITING | PIN_BASED_VIRTUAL_NMIS | | |
2180 | PIN_BASED_VMX_PREEMPTION_TIMER; | |
2181 | nested_vmx_pinbased_ctls_high |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR; | |
2182 | ||
2183 | /* | |
2184 | * Exit controls | |
2185 | * If bit 55 of VMX_BASIC is off, bits 0-8 and 10, 11, 13, 14, 16 and | |
2186 | * 17 must be 1. | |
2187 | */ | |
2188 | nested_vmx_exit_ctls_low = VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR; | |
2189 | /* Note that guest use of VM_EXIT_ACK_INTR_ON_EXIT is not supported. */ | |
2190 | #ifdef CONFIG_X86_64 | |
2191 | nested_vmx_exit_ctls_high = VM_EXIT_HOST_ADDR_SPACE_SIZE; | |
2192 | #else | |
2193 | nested_vmx_exit_ctls_high = 0; | |
2194 | #endif | |
2195 | nested_vmx_exit_ctls_high |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR; | |
2196 | ||
2197 | /* entry controls */ | |
2198 | rdmsr(MSR_IA32_VMX_ENTRY_CTLS, | |
2199 | nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high); | |
2200 | /* If bit 55 of VMX_BASIC is off, bits 0-8 and 12 must be 1. */ | |
2201 | nested_vmx_entry_ctls_low = VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR; | |
2202 | nested_vmx_entry_ctls_high &= | |
2203 | VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_IA32E_MODE; | |
2204 | nested_vmx_entry_ctls_high |= VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR; | |
2205 | ||
2206 | /* cpu-based controls */ | |
2207 | rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, | |
2208 | nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high); | |
2209 | nested_vmx_procbased_ctls_low = 0; | |
2210 | nested_vmx_procbased_ctls_high &= | |
2211 | CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_USE_TSC_OFFSETING | | |
2212 | CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING | | |
2213 | CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING | | |
2214 | CPU_BASED_CR3_STORE_EXITING | | |
2215 | #ifdef CONFIG_X86_64 | |
2216 | CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING | | |
2217 | #endif | |
2218 | CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING | | |
2219 | CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING | | |
2220 | CPU_BASED_RDPMC_EXITING | CPU_BASED_RDTSC_EXITING | | |
2221 | CPU_BASED_PAUSE_EXITING | | |
2222 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; | |
2223 | /* | |
2224 | * We can allow some features even when not supported by the | |
2225 | * hardware. For example, L1 can specify an MSR bitmap - and we | |
2226 | * can use it to avoid exits to L1 - even when L0 runs L2 | |
2227 | * without MSR bitmaps. | |
2228 | */ | |
2229 | nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS; | |
2230 | ||
2231 | /* secondary cpu-based controls */ | |
2232 | rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, | |
2233 | nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high); | |
2234 | nested_vmx_secondary_ctls_low = 0; | |
2235 | nested_vmx_secondary_ctls_high &= | |
2236 | SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | | |
2237 | SECONDARY_EXEC_WBINVD_EXITING; | |
2238 | ||
2239 | /* miscellaneous data */ | |
2240 | rdmsr(MSR_IA32_VMX_MISC, nested_vmx_misc_low, nested_vmx_misc_high); | |
2241 | nested_vmx_misc_low &= VMX_MISC_PREEMPTION_TIMER_RATE_MASK | | |
2242 | VMX_MISC_SAVE_EFER_LMA; | |
2243 | nested_vmx_misc_high = 0; | |
2244 | } | |
2245 | ||
2246 | static inline bool vmx_control_verify(u32 control, u32 low, u32 high) | |
2247 | { | |
2248 | /* | |
2249 | * Bits 0 in high must be 0, and bits 1 in low must be 1. | |
2250 | */ | |
2251 | return ((control & high) | low) == control; | |
2252 | } | |
2253 | ||
2254 | static inline u64 vmx_control_msr(u32 low, u32 high) | |
2255 | { | |
2256 | return low | ((u64)high << 32); | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * If we allow our guest to use VMX instructions (i.e., nested VMX), we should | |
2261 | * also let it use VMX-specific MSRs. | |
2262 | * vmx_get_vmx_msr() and vmx_set_vmx_msr() return 1 when we handled a | |
2263 | * VMX-specific MSR, or 0 when we haven't (and the caller should handle it | |
2264 | * like all other MSRs). | |
2265 | */ | |
2266 | static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) | |
2267 | { | |
2268 | if (!nested_vmx_allowed(vcpu) && msr_index >= MSR_IA32_VMX_BASIC && | |
2269 | msr_index <= MSR_IA32_VMX_TRUE_ENTRY_CTLS) { | |
2270 | /* | |
2271 | * According to the spec, processors which do not support VMX | |
2272 | * should throw a #GP(0) when VMX capability MSRs are read. | |
2273 | */ | |
2274 | kvm_queue_exception_e(vcpu, GP_VECTOR, 0); | |
2275 | return 1; | |
2276 | } | |
2277 | ||
2278 | switch (msr_index) { | |
2279 | case MSR_IA32_FEATURE_CONTROL: | |
2280 | *pdata = 0; | |
2281 | break; | |
2282 | case MSR_IA32_VMX_BASIC: | |
2283 | /* | |
2284 | * This MSR reports some information about VMX support. We | |
2285 | * should return information about the VMX we emulate for the | |
2286 | * guest, and the VMCS structure we give it - not about the | |
2287 | * VMX support of the underlying hardware. | |
2288 | */ | |
2289 | *pdata = VMCS12_REVISION | | |
2290 | ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) | | |
2291 | (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT); | |
2292 | break; | |
2293 | case MSR_IA32_VMX_TRUE_PINBASED_CTLS: | |
2294 | case MSR_IA32_VMX_PINBASED_CTLS: | |
2295 | *pdata = vmx_control_msr(nested_vmx_pinbased_ctls_low, | |
2296 | nested_vmx_pinbased_ctls_high); | |
2297 | break; | |
2298 | case MSR_IA32_VMX_TRUE_PROCBASED_CTLS: | |
2299 | case MSR_IA32_VMX_PROCBASED_CTLS: | |
2300 | *pdata = vmx_control_msr(nested_vmx_procbased_ctls_low, | |
2301 | nested_vmx_procbased_ctls_high); | |
2302 | break; | |
2303 | case MSR_IA32_VMX_TRUE_EXIT_CTLS: | |
2304 | case MSR_IA32_VMX_EXIT_CTLS: | |
2305 | *pdata = vmx_control_msr(nested_vmx_exit_ctls_low, | |
2306 | nested_vmx_exit_ctls_high); | |
2307 | break; | |
2308 | case MSR_IA32_VMX_TRUE_ENTRY_CTLS: | |
2309 | case MSR_IA32_VMX_ENTRY_CTLS: | |
2310 | *pdata = vmx_control_msr(nested_vmx_entry_ctls_low, | |
2311 | nested_vmx_entry_ctls_high); | |
2312 | break; | |
2313 | case MSR_IA32_VMX_MISC: | |
2314 | *pdata = vmx_control_msr(nested_vmx_misc_low, | |
2315 | nested_vmx_misc_high); | |
2316 | break; | |
2317 | /* | |
2318 | * These MSRs specify bits which the guest must keep fixed (on or off) | |
2319 | * while L1 is in VMXON mode (in L1's root mode, or running an L2). | |
2320 | * We picked the standard core2 setting. | |
2321 | */ | |
2322 | #define VMXON_CR0_ALWAYSON (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE) | |
2323 | #define VMXON_CR4_ALWAYSON X86_CR4_VMXE | |
2324 | case MSR_IA32_VMX_CR0_FIXED0: | |
2325 | *pdata = VMXON_CR0_ALWAYSON; | |
2326 | break; | |
2327 | case MSR_IA32_VMX_CR0_FIXED1: | |
2328 | *pdata = -1ULL; | |
2329 | break; | |
2330 | case MSR_IA32_VMX_CR4_FIXED0: | |
2331 | *pdata = VMXON_CR4_ALWAYSON; | |
2332 | break; | |
2333 | case MSR_IA32_VMX_CR4_FIXED1: | |
2334 | *pdata = -1ULL; | |
2335 | break; | |
2336 | case MSR_IA32_VMX_VMCS_ENUM: | |
2337 | *pdata = 0x1f; | |
2338 | break; | |
2339 | case MSR_IA32_VMX_PROCBASED_CTLS2: | |
2340 | *pdata = vmx_control_msr(nested_vmx_secondary_ctls_low, | |
2341 | nested_vmx_secondary_ctls_high); | |
2342 | break; | |
2343 | case MSR_IA32_VMX_EPT_VPID_CAP: | |
2344 | /* Currently, no nested ept or nested vpid */ | |
2345 | *pdata = 0; | |
2346 | break; | |
2347 | default: | |
2348 | return 0; | |
2349 | } | |
2350 | ||
2351 | return 1; | |
2352 | } | |
2353 | ||
2354 | static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) | |
2355 | { | |
2356 | if (!nested_vmx_allowed(vcpu)) | |
2357 | return 0; | |
2358 | ||
2359 | if (msr_index == MSR_IA32_FEATURE_CONTROL) | |
2360 | /* TODO: the right thing. */ | |
2361 | return 1; | |
2362 | /* | |
2363 | * No need to treat VMX capability MSRs specially: If we don't handle | |
2364 | * them, handle_wrmsr will #GP(0), which is correct (they are readonly) | |
2365 | */ | |
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Reads an msr value (of 'msr_index') into 'pdata'. | |
2371 | * Returns 0 on success, non-0 otherwise. | |
2372 | * Assumes vcpu_load() was already called. | |
2373 | */ | |
2374 | static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) | |
2375 | { | |
2376 | u64 data; | |
2377 | struct shared_msr_entry *msr; | |
2378 | ||
2379 | if (!pdata) { | |
2380 | printk(KERN_ERR "BUG: get_msr called with NULL pdata\n"); | |
2381 | return -EINVAL; | |
2382 | } | |
2383 | ||
2384 | switch (msr_index) { | |
2385 | #ifdef CONFIG_X86_64 | |
2386 | case MSR_FS_BASE: | |
2387 | data = vmcs_readl(GUEST_FS_BASE); | |
2388 | break; | |
2389 | case MSR_GS_BASE: | |
2390 | data = vmcs_readl(GUEST_GS_BASE); | |
2391 | break; | |
2392 | case MSR_KERNEL_GS_BASE: | |
2393 | vmx_load_host_state(to_vmx(vcpu)); | |
2394 | data = to_vmx(vcpu)->msr_guest_kernel_gs_base; | |
2395 | break; | |
2396 | #endif | |
2397 | case MSR_EFER: | |
2398 | return kvm_get_msr_common(vcpu, msr_index, pdata); | |
2399 | case MSR_IA32_TSC: | |
2400 | data = guest_read_tsc(); | |
2401 | break; | |
2402 | case MSR_IA32_SYSENTER_CS: | |
2403 | data = vmcs_read32(GUEST_SYSENTER_CS); | |
2404 | break; | |
2405 | case MSR_IA32_SYSENTER_EIP: | |
2406 | data = vmcs_readl(GUEST_SYSENTER_EIP); | |
2407 | break; | |
2408 | case MSR_IA32_SYSENTER_ESP: | |
2409 | data = vmcs_readl(GUEST_SYSENTER_ESP); | |
2410 | break; | |
2411 | case MSR_TSC_AUX: | |
2412 | if (!to_vmx(vcpu)->rdtscp_enabled) | |
2413 | return 1; | |
2414 | /* Otherwise falls through */ | |
2415 | default: | |
2416 | if (vmx_get_vmx_msr(vcpu, msr_index, pdata)) | |
2417 | return 0; | |
2418 | msr = find_msr_entry(to_vmx(vcpu), msr_index); | |
2419 | if (msr) { | |
2420 | data = msr->data; | |
2421 | break; | |
2422 | } | |
2423 | return kvm_get_msr_common(vcpu, msr_index, pdata); | |
2424 | } | |
2425 | ||
2426 | *pdata = data; | |
2427 | return 0; | |
2428 | } | |
2429 | ||
2430 | /* | |
2431 | * Writes msr value into into the appropriate "register". | |
2432 | * Returns 0 on success, non-0 otherwise. | |
2433 | * Assumes vcpu_load() was already called. | |
2434 | */ | |
2435 | static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) | |
2436 | { | |
2437 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2438 | struct shared_msr_entry *msr; | |
2439 | int ret = 0; | |
2440 | u32 msr_index = msr_info->index; | |
2441 | u64 data = msr_info->data; | |
2442 | ||
2443 | switch (msr_index) { | |
2444 | case MSR_EFER: | |
2445 | ret = kvm_set_msr_common(vcpu, msr_info); | |
2446 | break; | |
2447 | #ifdef CONFIG_X86_64 | |
2448 | case MSR_FS_BASE: | |
2449 | vmx_segment_cache_clear(vmx); | |
2450 | vmcs_writel(GUEST_FS_BASE, data); | |
2451 | break; | |
2452 | case MSR_GS_BASE: | |
2453 | vmx_segment_cache_clear(vmx); | |
2454 | vmcs_writel(GUEST_GS_BASE, data); | |
2455 | break; | |
2456 | case MSR_KERNEL_GS_BASE: | |
2457 | vmx_load_host_state(vmx); | |
2458 | vmx->msr_guest_kernel_gs_base = data; | |
2459 | break; | |
2460 | #endif | |
2461 | case MSR_IA32_SYSENTER_CS: | |
2462 | vmcs_write32(GUEST_SYSENTER_CS, data); | |
2463 | break; | |
2464 | case MSR_IA32_SYSENTER_EIP: | |
2465 | vmcs_writel(GUEST_SYSENTER_EIP, data); | |
2466 | break; | |
2467 | case MSR_IA32_SYSENTER_ESP: | |
2468 | vmcs_writel(GUEST_SYSENTER_ESP, data); | |
2469 | break; | |
2470 | case MSR_IA32_TSC: | |
2471 | kvm_write_tsc(vcpu, msr_info); | |
2472 | break; | |
2473 | case MSR_IA32_CR_PAT: | |
2474 | if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { | |
2475 | vmcs_write64(GUEST_IA32_PAT, data); | |
2476 | vcpu->arch.pat = data; | |
2477 | break; | |
2478 | } | |
2479 | ret = kvm_set_msr_common(vcpu, msr_info); | |
2480 | break; | |
2481 | case MSR_IA32_TSC_ADJUST: | |
2482 | ret = kvm_set_msr_common(vcpu, msr_info); | |
2483 | break; | |
2484 | case MSR_TSC_AUX: | |
2485 | if (!vmx->rdtscp_enabled) | |
2486 | return 1; | |
2487 | /* Check reserved bit, higher 32 bits should be zero */ | |
2488 | if ((data >> 32) != 0) | |
2489 | return 1; | |
2490 | /* Otherwise falls through */ | |
2491 | default: | |
2492 | if (vmx_set_vmx_msr(vcpu, msr_index, data)) | |
2493 | break; | |
2494 | msr = find_msr_entry(vmx, msr_index); | |
2495 | if (msr) { | |
2496 | msr->data = data; | |
2497 | if (msr - vmx->guest_msrs < vmx->save_nmsrs) { | |
2498 | preempt_disable(); | |
2499 | kvm_set_shared_msr(msr->index, msr->data, | |
2500 | msr->mask); | |
2501 | preempt_enable(); | |
2502 | } | |
2503 | break; | |
2504 | } | |
2505 | ret = kvm_set_msr_common(vcpu, msr_info); | |
2506 | } | |
2507 | ||
2508 | return ret; | |
2509 | } | |
2510 | ||
2511 | static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) | |
2512 | { | |
2513 | __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); | |
2514 | switch (reg) { | |
2515 | case VCPU_REGS_RSP: | |
2516 | vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); | |
2517 | break; | |
2518 | case VCPU_REGS_RIP: | |
2519 | vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); | |
2520 | break; | |
2521 | case VCPU_EXREG_PDPTR: | |
2522 | if (enable_ept) | |
2523 | ept_save_pdptrs(vcpu); | |
2524 | break; | |
2525 | default: | |
2526 | break; | |
2527 | } | |
2528 | } | |
2529 | ||
2530 | static __init int cpu_has_kvm_support(void) | |
2531 | { | |
2532 | return cpu_has_vmx(); | |
2533 | } | |
2534 | ||
2535 | static __init int vmx_disabled_by_bios(void) | |
2536 | { | |
2537 | u64 msr; | |
2538 | ||
2539 | rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); | |
2540 | if (msr & FEATURE_CONTROL_LOCKED) { | |
2541 | /* launched w/ TXT and VMX disabled */ | |
2542 | if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) | |
2543 | && tboot_enabled()) | |
2544 | return 1; | |
2545 | /* launched w/o TXT and VMX only enabled w/ TXT */ | |
2546 | if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) | |
2547 | && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) | |
2548 | && !tboot_enabled()) { | |
2549 | printk(KERN_WARNING "kvm: disable TXT in the BIOS or " | |
2550 | "activate TXT before enabling KVM\n"); | |
2551 | return 1; | |
2552 | } | |
2553 | /* launched w/o TXT and VMX disabled */ | |
2554 | if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) | |
2555 | && !tboot_enabled()) | |
2556 | return 1; | |
2557 | } | |
2558 | ||
2559 | return 0; | |
2560 | } | |
2561 | ||
2562 | static void kvm_cpu_vmxon(u64 addr) | |
2563 | { | |
2564 | asm volatile (ASM_VMX_VMXON_RAX | |
2565 | : : "a"(&addr), "m"(addr) | |
2566 | : "memory", "cc"); | |
2567 | } | |
2568 | ||
2569 | static int hardware_enable(void *garbage) | |
2570 | { | |
2571 | int cpu = raw_smp_processor_id(); | |
2572 | u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); | |
2573 | u64 old, test_bits; | |
2574 | ||
2575 | if (read_cr4() & X86_CR4_VMXE) | |
2576 | return -EBUSY; | |
2577 | ||
2578 | INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu)); | |
2579 | ||
2580 | /* | |
2581 | * Now we can enable the vmclear operation in kdump | |
2582 | * since the loaded_vmcss_on_cpu list on this cpu | |
2583 | * has been initialized. | |
2584 | * | |
2585 | * Though the cpu is not in VMX operation now, there | |
2586 | * is no problem to enable the vmclear operation | |
2587 | * for the loaded_vmcss_on_cpu list is empty! | |
2588 | */ | |
2589 | crash_enable_local_vmclear(cpu); | |
2590 | ||
2591 | rdmsrl(MSR_IA32_FEATURE_CONTROL, old); | |
2592 | ||
2593 | test_bits = FEATURE_CONTROL_LOCKED; | |
2594 | test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; | |
2595 | if (tboot_enabled()) | |
2596 | test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX; | |
2597 | ||
2598 | if ((old & test_bits) != test_bits) { | |
2599 | /* enable and lock */ | |
2600 | wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits); | |
2601 | } | |
2602 | write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */ | |
2603 | ||
2604 | if (vmm_exclusive) { | |
2605 | kvm_cpu_vmxon(phys_addr); | |
2606 | ept_sync_global(); | |
2607 | } | |
2608 | ||
2609 | store_gdt(&__get_cpu_var(host_gdt)); | |
2610 | ||
2611 | return 0; | |
2612 | } | |
2613 | ||
2614 | static void vmclear_local_loaded_vmcss(void) | |
2615 | { | |
2616 | int cpu = raw_smp_processor_id(); | |
2617 | struct loaded_vmcs *v, *n; | |
2618 | ||
2619 | list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu), | |
2620 | loaded_vmcss_on_cpu_link) | |
2621 | __loaded_vmcs_clear(v); | |
2622 | } | |
2623 | ||
2624 | ||
2625 | /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot() | |
2626 | * tricks. | |
2627 | */ | |
2628 | static void kvm_cpu_vmxoff(void) | |
2629 | { | |
2630 | asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc"); | |
2631 | } | |
2632 | ||
2633 | static void hardware_disable(void *garbage) | |
2634 | { | |
2635 | if (vmm_exclusive) { | |
2636 | vmclear_local_loaded_vmcss(); | |
2637 | kvm_cpu_vmxoff(); | |
2638 | } | |
2639 | write_cr4(read_cr4() & ~X86_CR4_VMXE); | |
2640 | } | |
2641 | ||
2642 | static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt, | |
2643 | u32 msr, u32 *result) | |
2644 | { | |
2645 | u32 vmx_msr_low, vmx_msr_high; | |
2646 | u32 ctl = ctl_min | ctl_opt; | |
2647 | ||
2648 | rdmsr(msr, vmx_msr_low, vmx_msr_high); | |
2649 | ||
2650 | ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */ | |
2651 | ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */ | |
2652 | ||
2653 | /* Ensure minimum (required) set of control bits are supported. */ | |
2654 | if (ctl_min & ~ctl) | |
2655 | return -EIO; | |
2656 | ||
2657 | *result = ctl; | |
2658 | return 0; | |
2659 | } | |
2660 | ||
2661 | static __init bool allow_1_setting(u32 msr, u32 ctl) | |
2662 | { | |
2663 | u32 vmx_msr_low, vmx_msr_high; | |
2664 | ||
2665 | rdmsr(msr, vmx_msr_low, vmx_msr_high); | |
2666 | return vmx_msr_high & ctl; | |
2667 | } | |
2668 | ||
2669 | static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) | |
2670 | { | |
2671 | u32 vmx_msr_low, vmx_msr_high; | |
2672 | u32 min, opt, min2, opt2; | |
2673 | u32 _pin_based_exec_control = 0; | |
2674 | u32 _cpu_based_exec_control = 0; | |
2675 | u32 _cpu_based_2nd_exec_control = 0; | |
2676 | u32 _vmexit_control = 0; | |
2677 | u32 _vmentry_control = 0; | |
2678 | ||
2679 | min = CPU_BASED_HLT_EXITING | | |
2680 | #ifdef CONFIG_X86_64 | |
2681 | CPU_BASED_CR8_LOAD_EXITING | | |
2682 | CPU_BASED_CR8_STORE_EXITING | | |
2683 | #endif | |
2684 | CPU_BASED_CR3_LOAD_EXITING | | |
2685 | CPU_BASED_CR3_STORE_EXITING | | |
2686 | CPU_BASED_USE_IO_BITMAPS | | |
2687 | CPU_BASED_MOV_DR_EXITING | | |
2688 | CPU_BASED_USE_TSC_OFFSETING | | |
2689 | CPU_BASED_MWAIT_EXITING | | |
2690 | CPU_BASED_MONITOR_EXITING | | |
2691 | CPU_BASED_INVLPG_EXITING | | |
2692 | CPU_BASED_RDPMC_EXITING; | |
2693 | ||
2694 | opt = CPU_BASED_TPR_SHADOW | | |
2695 | CPU_BASED_USE_MSR_BITMAPS | | |
2696 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; | |
2697 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, | |
2698 | &_cpu_based_exec_control) < 0) | |
2699 | return -EIO; | |
2700 | #ifdef CONFIG_X86_64 | |
2701 | if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) | |
2702 | _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & | |
2703 | ~CPU_BASED_CR8_STORE_EXITING; | |
2704 | #endif | |
2705 | if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) { | |
2706 | min2 = 0; | |
2707 | opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | | |
2708 | SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | | |
2709 | SECONDARY_EXEC_WBINVD_EXITING | | |
2710 | SECONDARY_EXEC_ENABLE_VPID | | |
2711 | SECONDARY_EXEC_ENABLE_EPT | | |
2712 | SECONDARY_EXEC_UNRESTRICTED_GUEST | | |
2713 | SECONDARY_EXEC_PAUSE_LOOP_EXITING | | |
2714 | SECONDARY_EXEC_RDTSCP | | |
2715 | SECONDARY_EXEC_ENABLE_INVPCID | | |
2716 | SECONDARY_EXEC_APIC_REGISTER_VIRT | | |
2717 | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | | |
2718 | SECONDARY_EXEC_SHADOW_VMCS; | |
2719 | if (adjust_vmx_controls(min2, opt2, | |
2720 | MSR_IA32_VMX_PROCBASED_CTLS2, | |
2721 | &_cpu_based_2nd_exec_control) < 0) | |
2722 | return -EIO; | |
2723 | } | |
2724 | #ifndef CONFIG_X86_64 | |
2725 | if (!(_cpu_based_2nd_exec_control & | |
2726 | SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) | |
2727 | _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW; | |
2728 | #endif | |
2729 | ||
2730 | if (!(_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) | |
2731 | _cpu_based_2nd_exec_control &= ~( | |
2732 | SECONDARY_EXEC_APIC_REGISTER_VIRT | | |
2733 | SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | | |
2734 | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); | |
2735 | ||
2736 | if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) { | |
2737 | /* CR3 accesses and invlpg don't need to cause VM Exits when EPT | |
2738 | enabled */ | |
2739 | _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING | | |
2740 | CPU_BASED_CR3_STORE_EXITING | | |
2741 | CPU_BASED_INVLPG_EXITING); | |
2742 | rdmsr(MSR_IA32_VMX_EPT_VPID_CAP, | |
2743 | vmx_capability.ept, vmx_capability.vpid); | |
2744 | } | |
2745 | ||
2746 | min = 0; | |
2747 | #ifdef CONFIG_X86_64 | |
2748 | min |= VM_EXIT_HOST_ADDR_SPACE_SIZE; | |
2749 | #endif | |
2750 | opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT | | |
2751 | VM_EXIT_ACK_INTR_ON_EXIT; | |
2752 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS, | |
2753 | &_vmexit_control) < 0) | |
2754 | return -EIO; | |
2755 | ||
2756 | min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING; | |
2757 | opt = PIN_BASED_VIRTUAL_NMIS | PIN_BASED_POSTED_INTR; | |
2758 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS, | |
2759 | &_pin_based_exec_control) < 0) | |
2760 | return -EIO; | |
2761 | ||
2762 | if (!(_cpu_based_2nd_exec_control & | |
2763 | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY) || | |
2764 | !(_vmexit_control & VM_EXIT_ACK_INTR_ON_EXIT)) | |
2765 | _pin_based_exec_control &= ~PIN_BASED_POSTED_INTR; | |
2766 | ||
2767 | min = 0; | |
2768 | opt = VM_ENTRY_LOAD_IA32_PAT; | |
2769 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS, | |
2770 | &_vmentry_control) < 0) | |
2771 | return -EIO; | |
2772 | ||
2773 | rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); | |
2774 | ||
2775 | /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */ | |
2776 | if ((vmx_msr_high & 0x1fff) > PAGE_SIZE) | |
2777 | return -EIO; | |
2778 | ||
2779 | #ifdef CONFIG_X86_64 | |
2780 | /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */ | |
2781 | if (vmx_msr_high & (1u<<16)) | |
2782 | return -EIO; | |
2783 | #endif | |
2784 | ||
2785 | /* Require Write-Back (WB) memory type for VMCS accesses. */ | |
2786 | if (((vmx_msr_high >> 18) & 15) != 6) | |
2787 | return -EIO; | |
2788 | ||
2789 | vmcs_conf->size = vmx_msr_high & 0x1fff; | |
2790 | vmcs_conf->order = get_order(vmcs_config.size); | |
2791 | vmcs_conf->revision_id = vmx_msr_low; | |
2792 | ||
2793 | vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; | |
2794 | vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control; | |
2795 | vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control; | |
2796 | vmcs_conf->vmexit_ctrl = _vmexit_control; | |
2797 | vmcs_conf->vmentry_ctrl = _vmentry_control; | |
2798 | ||
2799 | cpu_has_load_ia32_efer = | |
2800 | allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS, | |
2801 | VM_ENTRY_LOAD_IA32_EFER) | |
2802 | && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS, | |
2803 | VM_EXIT_LOAD_IA32_EFER); | |
2804 | ||
2805 | cpu_has_load_perf_global_ctrl = | |
2806 | allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS, | |
2807 | VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) | |
2808 | && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS, | |
2809 | VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL); | |
2810 | ||
2811 | /* | |
2812 | * Some cpus support VM_ENTRY_(LOAD|SAVE)_IA32_PERF_GLOBAL_CTRL | |
2813 | * but due to arrata below it can't be used. Workaround is to use | |
2814 | * msr load mechanism to switch IA32_PERF_GLOBAL_CTRL. | |
2815 | * | |
2816 | * VM Exit May Incorrectly Clear IA32_PERF_GLOBAL_CTRL [34:32] | |
2817 | * | |
2818 | * AAK155 (model 26) | |
2819 | * AAP115 (model 30) | |
2820 | * AAT100 (model 37) | |
2821 | * BC86,AAY89,BD102 (model 44) | |
2822 | * BA97 (model 46) | |
2823 | * | |
2824 | */ | |
2825 | if (cpu_has_load_perf_global_ctrl && boot_cpu_data.x86 == 0x6) { | |
2826 | switch (boot_cpu_data.x86_model) { | |
2827 | case 26: | |
2828 | case 30: | |
2829 | case 37: | |
2830 | case 44: | |
2831 | case 46: | |
2832 | cpu_has_load_perf_global_ctrl = false; | |
2833 | printk_once(KERN_WARNING"kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL " | |
2834 | "does not work properly. Using workaround\n"); | |
2835 | break; | |
2836 | default: | |
2837 | break; | |
2838 | } | |
2839 | } | |
2840 | ||
2841 | return 0; | |
2842 | } | |
2843 | ||
2844 | static struct vmcs *alloc_vmcs_cpu(int cpu) | |
2845 | { | |
2846 | int node = cpu_to_node(cpu); | |
2847 | struct page *pages; | |
2848 | struct vmcs *vmcs; | |
2849 | ||
2850 | pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order); | |
2851 | if (!pages) | |
2852 | return NULL; | |
2853 | vmcs = page_address(pages); | |
2854 | memset(vmcs, 0, vmcs_config.size); | |
2855 | vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */ | |
2856 | return vmcs; | |
2857 | } | |
2858 | ||
2859 | static struct vmcs *alloc_vmcs(void) | |
2860 | { | |
2861 | return alloc_vmcs_cpu(raw_smp_processor_id()); | |
2862 | } | |
2863 | ||
2864 | static void free_vmcs(struct vmcs *vmcs) | |
2865 | { | |
2866 | free_pages((unsigned long)vmcs, vmcs_config.order); | |
2867 | } | |
2868 | ||
2869 | /* | |
2870 | * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded | |
2871 | */ | |
2872 | static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs) | |
2873 | { | |
2874 | if (!loaded_vmcs->vmcs) | |
2875 | return; | |
2876 | loaded_vmcs_clear(loaded_vmcs); | |
2877 | free_vmcs(loaded_vmcs->vmcs); | |
2878 | loaded_vmcs->vmcs = NULL; | |
2879 | } | |
2880 | ||
2881 | static void free_kvm_area(void) | |
2882 | { | |
2883 | int cpu; | |
2884 | ||
2885 | for_each_possible_cpu(cpu) { | |
2886 | free_vmcs(per_cpu(vmxarea, cpu)); | |
2887 | per_cpu(vmxarea, cpu) = NULL; | |
2888 | } | |
2889 | } | |
2890 | ||
2891 | static __init int alloc_kvm_area(void) | |
2892 | { | |
2893 | int cpu; | |
2894 | ||
2895 | for_each_possible_cpu(cpu) { | |
2896 | struct vmcs *vmcs; | |
2897 | ||
2898 | vmcs = alloc_vmcs_cpu(cpu); | |
2899 | if (!vmcs) { | |
2900 | free_kvm_area(); | |
2901 | return -ENOMEM; | |
2902 | } | |
2903 | ||
2904 | per_cpu(vmxarea, cpu) = vmcs; | |
2905 | } | |
2906 | return 0; | |
2907 | } | |
2908 | ||
2909 | static __init int hardware_setup(void) | |
2910 | { | |
2911 | if (setup_vmcs_config(&vmcs_config) < 0) | |
2912 | return -EIO; | |
2913 | ||
2914 | if (boot_cpu_has(X86_FEATURE_NX)) | |
2915 | kvm_enable_efer_bits(EFER_NX); | |
2916 | ||
2917 | if (!cpu_has_vmx_vpid()) | |
2918 | enable_vpid = 0; | |
2919 | if (!cpu_has_vmx_shadow_vmcs()) | |
2920 | enable_shadow_vmcs = 0; | |
2921 | ||
2922 | if (!cpu_has_vmx_ept() || | |
2923 | !cpu_has_vmx_ept_4levels()) { | |
2924 | enable_ept = 0; | |
2925 | enable_unrestricted_guest = 0; | |
2926 | enable_ept_ad_bits = 0; | |
2927 | } | |
2928 | ||
2929 | if (!cpu_has_vmx_ept_ad_bits()) | |
2930 | enable_ept_ad_bits = 0; | |
2931 | ||
2932 | if (!cpu_has_vmx_unrestricted_guest()) | |
2933 | enable_unrestricted_guest = 0; | |
2934 | ||
2935 | if (!cpu_has_vmx_flexpriority()) | |
2936 | flexpriority_enabled = 0; | |
2937 | ||
2938 | if (!cpu_has_vmx_tpr_shadow()) | |
2939 | kvm_x86_ops->update_cr8_intercept = NULL; | |
2940 | ||
2941 | if (enable_ept && !cpu_has_vmx_ept_2m_page()) | |
2942 | kvm_disable_largepages(); | |
2943 | ||
2944 | if (!cpu_has_vmx_ple()) | |
2945 | ple_gap = 0; | |
2946 | ||
2947 | if (!cpu_has_vmx_apicv()) | |
2948 | enable_apicv = 0; | |
2949 | ||
2950 | if (enable_apicv) | |
2951 | kvm_x86_ops->update_cr8_intercept = NULL; | |
2952 | else { | |
2953 | kvm_x86_ops->hwapic_irr_update = NULL; | |
2954 | kvm_x86_ops->deliver_posted_interrupt = NULL; | |
2955 | kvm_x86_ops->sync_pir_to_irr = vmx_sync_pir_to_irr_dummy; | |
2956 | } | |
2957 | ||
2958 | if (nested) | |
2959 | nested_vmx_setup_ctls_msrs(); | |
2960 | ||
2961 | return alloc_kvm_area(); | |
2962 | } | |
2963 | ||
2964 | static __exit void hardware_unsetup(void) | |
2965 | { | |
2966 | free_kvm_area(); | |
2967 | } | |
2968 | ||
2969 | static bool emulation_required(struct kvm_vcpu *vcpu) | |
2970 | { | |
2971 | return emulate_invalid_guest_state && !guest_state_valid(vcpu); | |
2972 | } | |
2973 | ||
2974 | static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg, | |
2975 | struct kvm_segment *save) | |
2976 | { | |
2977 | if (!emulate_invalid_guest_state) { | |
2978 | /* | |
2979 | * CS and SS RPL should be equal during guest entry according | |
2980 | * to VMX spec, but in reality it is not always so. Since vcpu | |
2981 | * is in the middle of the transition from real mode to | |
2982 | * protected mode it is safe to assume that RPL 0 is a good | |
2983 | * default value. | |
2984 | */ | |
2985 | if (seg == VCPU_SREG_CS || seg == VCPU_SREG_SS) | |
2986 | save->selector &= ~SELECTOR_RPL_MASK; | |
2987 | save->dpl = save->selector & SELECTOR_RPL_MASK; | |
2988 | save->s = 1; | |
2989 | } | |
2990 | vmx_set_segment(vcpu, save, seg); | |
2991 | } | |
2992 | ||
2993 | static void enter_pmode(struct kvm_vcpu *vcpu) | |
2994 | { | |
2995 | unsigned long flags; | |
2996 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2997 | ||
2998 | /* | |
2999 | * Update real mode segment cache. It may be not up-to-date if sement | |
3000 | * register was written while vcpu was in a guest mode. | |
3001 | */ | |
3002 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); | |
3003 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); | |
3004 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); | |
3005 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); | |
3006 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS); | |
3007 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS); | |
3008 | ||
3009 | vmx->rmode.vm86_active = 0; | |
3010 | ||
3011 | vmx_segment_cache_clear(vmx); | |
3012 | ||
3013 | vmx_set_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); | |
3014 | ||
3015 | flags = vmcs_readl(GUEST_RFLAGS); | |
3016 | flags &= RMODE_GUEST_OWNED_EFLAGS_BITS; | |
3017 | flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS; | |
3018 | vmcs_writel(GUEST_RFLAGS, flags); | |
3019 | ||
3020 | vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) | | |
3021 | (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME)); | |
3022 | ||
3023 | update_exception_bitmap(vcpu); | |
3024 | ||
3025 | fix_pmode_seg(vcpu, VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]); | |
3026 | fix_pmode_seg(vcpu, VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]); | |
3027 | fix_pmode_seg(vcpu, VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); | |
3028 | fix_pmode_seg(vcpu, VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); | |
3029 | fix_pmode_seg(vcpu, VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); | |
3030 | fix_pmode_seg(vcpu, VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); | |
3031 | ||
3032 | /* CPL is always 0 when CPU enters protected mode */ | |
3033 | __set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); | |
3034 | vmx->cpl = 0; | |
3035 | } | |
3036 | ||
3037 | static void fix_rmode_seg(int seg, struct kvm_segment *save) | |
3038 | { | |
3039 | const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
3040 | struct kvm_segment var = *save; | |
3041 | ||
3042 | var.dpl = 0x3; | |
3043 | if (seg == VCPU_SREG_CS) | |
3044 | var.type = 0x3; | |
3045 | ||
3046 | if (!emulate_invalid_guest_state) { | |
3047 | var.selector = var.base >> 4; | |
3048 | var.base = var.base & 0xffff0; | |
3049 | var.limit = 0xffff; | |
3050 | var.g = 0; | |
3051 | var.db = 0; | |
3052 | var.present = 1; | |
3053 | var.s = 1; | |
3054 | var.l = 0; | |
3055 | var.unusable = 0; | |
3056 | var.type = 0x3; | |
3057 | var.avl = 0; | |
3058 | if (save->base & 0xf) | |
3059 | printk_once(KERN_WARNING "kvm: segment base is not " | |
3060 | "paragraph aligned when entering " | |
3061 | "protected mode (seg=%d)", seg); | |
3062 | } | |
3063 | ||
3064 | vmcs_write16(sf->selector, var.selector); | |
3065 | vmcs_write32(sf->base, var.base); | |
3066 | vmcs_write32(sf->limit, var.limit); | |
3067 | vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(&var)); | |
3068 | } | |
3069 | ||
3070 | static void enter_rmode(struct kvm_vcpu *vcpu) | |
3071 | { | |
3072 | unsigned long flags; | |
3073 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3074 | ||
3075 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_TR], VCPU_SREG_TR); | |
3076 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_ES], VCPU_SREG_ES); | |
3077 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_DS], VCPU_SREG_DS); | |
3078 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_FS], VCPU_SREG_FS); | |
3079 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_GS], VCPU_SREG_GS); | |
3080 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_SS], VCPU_SREG_SS); | |
3081 | vmx_get_segment(vcpu, &vmx->rmode.segs[VCPU_SREG_CS], VCPU_SREG_CS); | |
3082 | ||
3083 | vmx->rmode.vm86_active = 1; | |
3084 | ||
3085 | /* | |
3086 | * Very old userspace does not call KVM_SET_TSS_ADDR before entering | |
3087 | * vcpu. Warn the user that an update is overdue. | |
3088 | */ | |
3089 | if (!vcpu->kvm->arch.tss_addr) | |
3090 | printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be " | |
3091 | "called before entering vcpu\n"); | |
3092 | ||
3093 | vmx_segment_cache_clear(vmx); | |
3094 | ||
3095 | vmcs_writel(GUEST_TR_BASE, vcpu->kvm->arch.tss_addr); | |
3096 | vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); | |
3097 | vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); | |
3098 | ||
3099 | flags = vmcs_readl(GUEST_RFLAGS); | |
3100 | vmx->rmode.save_rflags = flags; | |
3101 | ||
3102 | flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; | |
3103 | ||
3104 | vmcs_writel(GUEST_RFLAGS, flags); | |
3105 | vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); | |
3106 | update_exception_bitmap(vcpu); | |
3107 | ||
3108 | fix_rmode_seg(VCPU_SREG_SS, &vmx->rmode.segs[VCPU_SREG_SS]); | |
3109 | fix_rmode_seg(VCPU_SREG_CS, &vmx->rmode.segs[VCPU_SREG_CS]); | |
3110 | fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.segs[VCPU_SREG_ES]); | |
3111 | fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); | |
3112 | fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); | |
3113 | fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); | |
3114 | ||
3115 | kvm_mmu_reset_context(vcpu); | |
3116 | } | |
3117 | ||
3118 | static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) | |
3119 | { | |
3120 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3121 | struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER); | |
3122 | ||
3123 | if (!msr) | |
3124 | return; | |
3125 | ||
3126 | /* | |
3127 | * Force kernel_gs_base reloading before EFER changes, as control | |
3128 | * of this msr depends on is_long_mode(). | |
3129 | */ | |
3130 | vmx_load_host_state(to_vmx(vcpu)); | |
3131 | vcpu->arch.efer = efer; | |
3132 | if (efer & EFER_LMA) { | |
3133 | vmcs_write32(VM_ENTRY_CONTROLS, | |
3134 | vmcs_read32(VM_ENTRY_CONTROLS) | | |
3135 | VM_ENTRY_IA32E_MODE); | |
3136 | msr->data = efer; | |
3137 | } else { | |
3138 | vmcs_write32(VM_ENTRY_CONTROLS, | |
3139 | vmcs_read32(VM_ENTRY_CONTROLS) & | |
3140 | ~VM_ENTRY_IA32E_MODE); | |
3141 | ||
3142 | msr->data = efer & ~EFER_LME; | |
3143 | } | |
3144 | setup_msrs(vmx); | |
3145 | } | |
3146 | ||
3147 | #ifdef CONFIG_X86_64 | |
3148 | ||
3149 | static void enter_lmode(struct kvm_vcpu *vcpu) | |
3150 | { | |
3151 | u32 guest_tr_ar; | |
3152 | ||
3153 | vmx_segment_cache_clear(to_vmx(vcpu)); | |
3154 | ||
3155 | guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES); | |
3156 | if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) { | |
3157 | pr_debug_ratelimited("%s: tss fixup for long mode. \n", | |
3158 | __func__); | |
3159 | vmcs_write32(GUEST_TR_AR_BYTES, | |
3160 | (guest_tr_ar & ~AR_TYPE_MASK) | |
3161 | | AR_TYPE_BUSY_64_TSS); | |
3162 | } | |
3163 | vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA); | |
3164 | } | |
3165 | ||
3166 | static void exit_lmode(struct kvm_vcpu *vcpu) | |
3167 | { | |
3168 | vmcs_write32(VM_ENTRY_CONTROLS, | |
3169 | vmcs_read32(VM_ENTRY_CONTROLS) | |
3170 | & ~VM_ENTRY_IA32E_MODE); | |
3171 | vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA); | |
3172 | } | |
3173 | ||
3174 | #endif | |
3175 | ||
3176 | static void vmx_flush_tlb(struct kvm_vcpu *vcpu) | |
3177 | { | |
3178 | vpid_sync_context(to_vmx(vcpu)); | |
3179 | if (enable_ept) { | |
3180 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) | |
3181 | return; | |
3182 | ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa)); | |
3183 | } | |
3184 | } | |
3185 | ||
3186 | static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) | |
3187 | { | |
3188 | ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits; | |
3189 | ||
3190 | vcpu->arch.cr0 &= ~cr0_guest_owned_bits; | |
3191 | vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits; | |
3192 | } | |
3193 | ||
3194 | static void vmx_decache_cr3(struct kvm_vcpu *vcpu) | |
3195 | { | |
3196 | if (enable_ept && is_paging(vcpu)) | |
3197 | vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); | |
3198 | __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); | |
3199 | } | |
3200 | ||
3201 | static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) | |
3202 | { | |
3203 | ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; | |
3204 | ||
3205 | vcpu->arch.cr4 &= ~cr4_guest_owned_bits; | |
3206 | vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits; | |
3207 | } | |
3208 | ||
3209 | static void ept_load_pdptrs(struct kvm_vcpu *vcpu) | |
3210 | { | |
3211 | if (!test_bit(VCPU_EXREG_PDPTR, | |
3212 | (unsigned long *)&vcpu->arch.regs_dirty)) | |
3213 | return; | |
3214 | ||
3215 | if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { | |
3216 | vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]); | |
3217 | vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]); | |
3218 | vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]); | |
3219 | vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]); | |
3220 | } | |
3221 | } | |
3222 | ||
3223 | static void ept_save_pdptrs(struct kvm_vcpu *vcpu) | |
3224 | { | |
3225 | if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { | |
3226 | vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0); | |
3227 | vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1); | |
3228 | vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2); | |
3229 | vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3); | |
3230 | } | |
3231 | ||
3232 | __set_bit(VCPU_EXREG_PDPTR, | |
3233 | (unsigned long *)&vcpu->arch.regs_avail); | |
3234 | __set_bit(VCPU_EXREG_PDPTR, | |
3235 | (unsigned long *)&vcpu->arch.regs_dirty); | |
3236 | } | |
3237 | ||
3238 | static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4); | |
3239 | ||
3240 | static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, | |
3241 | unsigned long cr0, | |
3242 | struct kvm_vcpu *vcpu) | |
3243 | { | |
3244 | if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail)) | |
3245 | vmx_decache_cr3(vcpu); | |
3246 | if (!(cr0 & X86_CR0_PG)) { | |
3247 | /* From paging/starting to nonpaging */ | |
3248 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, | |
3249 | vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) | | |
3250 | (CPU_BASED_CR3_LOAD_EXITING | | |
3251 | CPU_BASED_CR3_STORE_EXITING)); | |
3252 | vcpu->arch.cr0 = cr0; | |
3253 | vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); | |
3254 | } else if (!is_paging(vcpu)) { | |
3255 | /* From nonpaging to paging */ | |
3256 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, | |
3257 | vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & | |
3258 | ~(CPU_BASED_CR3_LOAD_EXITING | | |
3259 | CPU_BASED_CR3_STORE_EXITING)); | |
3260 | vcpu->arch.cr0 = cr0; | |
3261 | vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); | |
3262 | } | |
3263 | ||
3264 | if (!(cr0 & X86_CR0_WP)) | |
3265 | *hw_cr0 &= ~X86_CR0_WP; | |
3266 | } | |
3267 | ||
3268 | static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) | |
3269 | { | |
3270 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3271 | unsigned long hw_cr0; | |
3272 | ||
3273 | hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK); | |
3274 | if (enable_unrestricted_guest) | |
3275 | hw_cr0 |= KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; | |
3276 | else { | |
3277 | hw_cr0 |= KVM_VM_CR0_ALWAYS_ON; | |
3278 | ||
3279 | if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) | |
3280 | enter_pmode(vcpu); | |
3281 | ||
3282 | if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) | |
3283 | enter_rmode(vcpu); | |
3284 | } | |
3285 | ||
3286 | #ifdef CONFIG_X86_64 | |
3287 | if (vcpu->arch.efer & EFER_LME) { | |
3288 | if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) | |
3289 | enter_lmode(vcpu); | |
3290 | if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) | |
3291 | exit_lmode(vcpu); | |
3292 | } | |
3293 | #endif | |
3294 | ||
3295 | if (enable_ept) | |
3296 | ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); | |
3297 | ||
3298 | if (!vcpu->fpu_active) | |
3299 | hw_cr0 |= X86_CR0_TS | X86_CR0_MP; | |
3300 | ||
3301 | vmcs_writel(CR0_READ_SHADOW, cr0); | |
3302 | vmcs_writel(GUEST_CR0, hw_cr0); | |
3303 | vcpu->arch.cr0 = cr0; | |
3304 | ||
3305 | /* depends on vcpu->arch.cr0 to be set to a new value */ | |
3306 | vmx->emulation_required = emulation_required(vcpu); | |
3307 | } | |
3308 | ||
3309 | static u64 construct_eptp(unsigned long root_hpa) | |
3310 | { | |
3311 | u64 eptp; | |
3312 | ||
3313 | /* TODO write the value reading from MSR */ | |
3314 | eptp = VMX_EPT_DEFAULT_MT | | |
3315 | VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT; | |
3316 | if (enable_ept_ad_bits) | |
3317 | eptp |= VMX_EPT_AD_ENABLE_BIT; | |
3318 | eptp |= (root_hpa & PAGE_MASK); | |
3319 | ||
3320 | return eptp; | |
3321 | } | |
3322 | ||
3323 | static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) | |
3324 | { | |
3325 | unsigned long guest_cr3; | |
3326 | u64 eptp; | |
3327 | ||
3328 | guest_cr3 = cr3; | |
3329 | if (enable_ept) { | |
3330 | eptp = construct_eptp(cr3); | |
3331 | vmcs_write64(EPT_POINTER, eptp); | |
3332 | guest_cr3 = is_paging(vcpu) ? kvm_read_cr3(vcpu) : | |
3333 | vcpu->kvm->arch.ept_identity_map_addr; | |
3334 | ept_load_pdptrs(vcpu); | |
3335 | } | |
3336 | ||
3337 | vmx_flush_tlb(vcpu); | |
3338 | vmcs_writel(GUEST_CR3, guest_cr3); | |
3339 | } | |
3340 | ||
3341 | static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) | |
3342 | { | |
3343 | unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ? | |
3344 | KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON); | |
3345 | ||
3346 | if (cr4 & X86_CR4_VMXE) { | |
3347 | /* | |
3348 | * To use VMXON (and later other VMX instructions), a guest | |
3349 | * must first be able to turn on cr4.VMXE (see handle_vmon()). | |
3350 | * So basically the check on whether to allow nested VMX | |
3351 | * is here. | |
3352 | */ | |
3353 | if (!nested_vmx_allowed(vcpu)) | |
3354 | return 1; | |
3355 | } | |
3356 | if (to_vmx(vcpu)->nested.vmxon && | |
3357 | ((cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) | |
3358 | return 1; | |
3359 | ||
3360 | vcpu->arch.cr4 = cr4; | |
3361 | if (enable_ept) { | |
3362 | if (!is_paging(vcpu)) { | |
3363 | hw_cr4 &= ~X86_CR4_PAE; | |
3364 | hw_cr4 |= X86_CR4_PSE; | |
3365 | /* | |
3366 | * SMEP is disabled if CPU is in non-paging mode in | |
3367 | * hardware. However KVM always uses paging mode to | |
3368 | * emulate guest non-paging mode with TDP. | |
3369 | * To emulate this behavior, SMEP needs to be manually | |
3370 | * disabled when guest switches to non-paging mode. | |
3371 | */ | |
3372 | hw_cr4 &= ~X86_CR4_SMEP; | |
3373 | } else if (!(cr4 & X86_CR4_PAE)) { | |
3374 | hw_cr4 &= ~X86_CR4_PAE; | |
3375 | } | |
3376 | } | |
3377 | ||
3378 | vmcs_writel(CR4_READ_SHADOW, cr4); | |
3379 | vmcs_writel(GUEST_CR4, hw_cr4); | |
3380 | return 0; | |
3381 | } | |
3382 | ||
3383 | static void vmx_get_segment(struct kvm_vcpu *vcpu, | |
3384 | struct kvm_segment *var, int seg) | |
3385 | { | |
3386 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3387 | u32 ar; | |
3388 | ||
3389 | if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) { | |
3390 | *var = vmx->rmode.segs[seg]; | |
3391 | if (seg == VCPU_SREG_TR | |
3392 | || var->selector == vmx_read_guest_seg_selector(vmx, seg)) | |
3393 | return; | |
3394 | var->base = vmx_read_guest_seg_base(vmx, seg); | |
3395 | var->selector = vmx_read_guest_seg_selector(vmx, seg); | |
3396 | return; | |
3397 | } | |
3398 | var->base = vmx_read_guest_seg_base(vmx, seg); | |
3399 | var->limit = vmx_read_guest_seg_limit(vmx, seg); | |
3400 | var->selector = vmx_read_guest_seg_selector(vmx, seg); | |
3401 | ar = vmx_read_guest_seg_ar(vmx, seg); | |
3402 | var->type = ar & 15; | |
3403 | var->s = (ar >> 4) & 1; | |
3404 | var->dpl = (ar >> 5) & 3; | |
3405 | var->present = (ar >> 7) & 1; | |
3406 | var->avl = (ar >> 12) & 1; | |
3407 | var->l = (ar >> 13) & 1; | |
3408 | var->db = (ar >> 14) & 1; | |
3409 | var->g = (ar >> 15) & 1; | |
3410 | var->unusable = (ar >> 16) & 1; | |
3411 | } | |
3412 | ||
3413 | static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg) | |
3414 | { | |
3415 | struct kvm_segment s; | |
3416 | ||
3417 | if (to_vmx(vcpu)->rmode.vm86_active) { | |
3418 | vmx_get_segment(vcpu, &s, seg); | |
3419 | return s.base; | |
3420 | } | |
3421 | return vmx_read_guest_seg_base(to_vmx(vcpu), seg); | |
3422 | } | |
3423 | ||
3424 | static int vmx_get_cpl(struct kvm_vcpu *vcpu) | |
3425 | { | |
3426 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3427 | ||
3428 | if (!is_protmode(vcpu)) | |
3429 | return 0; | |
3430 | ||
3431 | if (!is_long_mode(vcpu) | |
3432 | && (kvm_get_rflags(vcpu) & X86_EFLAGS_VM)) /* if virtual 8086 */ | |
3433 | return 3; | |
3434 | ||
3435 | if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) { | |
3436 | __set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); | |
3437 | vmx->cpl = vmx_read_guest_seg_selector(vmx, VCPU_SREG_CS) & 3; | |
3438 | } | |
3439 | ||
3440 | return vmx->cpl; | |
3441 | } | |
3442 | ||
3443 | ||
3444 | static u32 vmx_segment_access_rights(struct kvm_segment *var) | |
3445 | { | |
3446 | u32 ar; | |
3447 | ||
3448 | if (var->unusable || !var->present) | |
3449 | ar = 1 << 16; | |
3450 | else { | |
3451 | ar = var->type & 15; | |
3452 | ar |= (var->s & 1) << 4; | |
3453 | ar |= (var->dpl & 3) << 5; | |
3454 | ar |= (var->present & 1) << 7; | |
3455 | ar |= (var->avl & 1) << 12; | |
3456 | ar |= (var->l & 1) << 13; | |
3457 | ar |= (var->db & 1) << 14; | |
3458 | ar |= (var->g & 1) << 15; | |
3459 | } | |
3460 | ||
3461 | return ar; | |
3462 | } | |
3463 | ||
3464 | static void vmx_set_segment(struct kvm_vcpu *vcpu, | |
3465 | struct kvm_segment *var, int seg) | |
3466 | { | |
3467 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3468 | const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
3469 | ||
3470 | vmx_segment_cache_clear(vmx); | |
3471 | if (seg == VCPU_SREG_CS) | |
3472 | __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail); | |
3473 | ||
3474 | if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) { | |
3475 | vmx->rmode.segs[seg] = *var; | |
3476 | if (seg == VCPU_SREG_TR) | |
3477 | vmcs_write16(sf->selector, var->selector); | |
3478 | else if (var->s) | |
3479 | fix_rmode_seg(seg, &vmx->rmode.segs[seg]); | |
3480 | goto out; | |
3481 | } | |
3482 | ||
3483 | vmcs_writel(sf->base, var->base); | |
3484 | vmcs_write32(sf->limit, var->limit); | |
3485 | vmcs_write16(sf->selector, var->selector); | |
3486 | ||
3487 | /* | |
3488 | * Fix the "Accessed" bit in AR field of segment registers for older | |
3489 | * qemu binaries. | |
3490 | * IA32 arch specifies that at the time of processor reset the | |
3491 | * "Accessed" bit in the AR field of segment registers is 1. And qemu | |
3492 | * is setting it to 0 in the userland code. This causes invalid guest | |
3493 | * state vmexit when "unrestricted guest" mode is turned on. | |
3494 | * Fix for this setup issue in cpu_reset is being pushed in the qemu | |
3495 | * tree. Newer qemu binaries with that qemu fix would not need this | |
3496 | * kvm hack. | |
3497 | */ | |
3498 | if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) | |
3499 | var->type |= 0x1; /* Accessed */ | |
3500 | ||
3501 | vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var)); | |
3502 | ||
3503 | out: | |
3504 | vmx->emulation_required |= emulation_required(vcpu); | |
3505 | } | |
3506 | ||
3507 | static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) | |
3508 | { | |
3509 | u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS); | |
3510 | ||
3511 | *db = (ar >> 14) & 1; | |
3512 | *l = (ar >> 13) & 1; | |
3513 | } | |
3514 | ||
3515 | static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) | |
3516 | { | |
3517 | dt->size = vmcs_read32(GUEST_IDTR_LIMIT); | |
3518 | dt->address = vmcs_readl(GUEST_IDTR_BASE); | |
3519 | } | |
3520 | ||
3521 | static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) | |
3522 | { | |
3523 | vmcs_write32(GUEST_IDTR_LIMIT, dt->size); | |
3524 | vmcs_writel(GUEST_IDTR_BASE, dt->address); | |
3525 | } | |
3526 | ||
3527 | static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) | |
3528 | { | |
3529 | dt->size = vmcs_read32(GUEST_GDTR_LIMIT); | |
3530 | dt->address = vmcs_readl(GUEST_GDTR_BASE); | |
3531 | } | |
3532 | ||
3533 | static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt) | |
3534 | { | |
3535 | vmcs_write32(GUEST_GDTR_LIMIT, dt->size); | |
3536 | vmcs_writel(GUEST_GDTR_BASE, dt->address); | |
3537 | } | |
3538 | ||
3539 | static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) | |
3540 | { | |
3541 | struct kvm_segment var; | |
3542 | u32 ar; | |
3543 | ||
3544 | vmx_get_segment(vcpu, &var, seg); | |
3545 | var.dpl = 0x3; | |
3546 | if (seg == VCPU_SREG_CS) | |
3547 | var.type = 0x3; | |
3548 | ar = vmx_segment_access_rights(&var); | |
3549 | ||
3550 | if (var.base != (var.selector << 4)) | |
3551 | return false; | |
3552 | if (var.limit != 0xffff) | |
3553 | return false; | |
3554 | if (ar != 0xf3) | |
3555 | return false; | |
3556 | ||
3557 | return true; | |
3558 | } | |
3559 | ||
3560 | static bool code_segment_valid(struct kvm_vcpu *vcpu) | |
3561 | { | |
3562 | struct kvm_segment cs; | |
3563 | unsigned int cs_rpl; | |
3564 | ||
3565 | vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); | |
3566 | cs_rpl = cs.selector & SELECTOR_RPL_MASK; | |
3567 | ||
3568 | if (cs.unusable) | |
3569 | return false; | |
3570 | if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK)) | |
3571 | return false; | |
3572 | if (!cs.s) | |
3573 | return false; | |
3574 | if (cs.type & AR_TYPE_WRITEABLE_MASK) { | |
3575 | if (cs.dpl > cs_rpl) | |
3576 | return false; | |
3577 | } else { | |
3578 | if (cs.dpl != cs_rpl) | |
3579 | return false; | |
3580 | } | |
3581 | if (!cs.present) | |
3582 | return false; | |
3583 | ||
3584 | /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */ | |
3585 | return true; | |
3586 | } | |
3587 | ||
3588 | static bool stack_segment_valid(struct kvm_vcpu *vcpu) | |
3589 | { | |
3590 | struct kvm_segment ss; | |
3591 | unsigned int ss_rpl; | |
3592 | ||
3593 | vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); | |
3594 | ss_rpl = ss.selector & SELECTOR_RPL_MASK; | |
3595 | ||
3596 | if (ss.unusable) | |
3597 | return true; | |
3598 | if (ss.type != 3 && ss.type != 7) | |
3599 | return false; | |
3600 | if (!ss.s) | |
3601 | return false; | |
3602 | if (ss.dpl != ss_rpl) /* DPL != RPL */ | |
3603 | return false; | |
3604 | if (!ss.present) | |
3605 | return false; | |
3606 | ||
3607 | return true; | |
3608 | } | |
3609 | ||
3610 | static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg) | |
3611 | { | |
3612 | struct kvm_segment var; | |
3613 | unsigned int rpl; | |
3614 | ||
3615 | vmx_get_segment(vcpu, &var, seg); | |
3616 | rpl = var.selector & SELECTOR_RPL_MASK; | |
3617 | ||
3618 | if (var.unusable) | |
3619 | return true; | |
3620 | if (!var.s) | |
3621 | return false; | |
3622 | if (!var.present) | |
3623 | return false; | |
3624 | if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) { | |
3625 | if (var.dpl < rpl) /* DPL < RPL */ | |
3626 | return false; | |
3627 | } | |
3628 | ||
3629 | /* TODO: Add other members to kvm_segment_field to allow checking for other access | |
3630 | * rights flags | |
3631 | */ | |
3632 | return true; | |
3633 | } | |
3634 | ||
3635 | static bool tr_valid(struct kvm_vcpu *vcpu) | |
3636 | { | |
3637 | struct kvm_segment tr; | |
3638 | ||
3639 | vmx_get_segment(vcpu, &tr, VCPU_SREG_TR); | |
3640 | ||
3641 | if (tr.unusable) | |
3642 | return false; | |
3643 | if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */ | |
3644 | return false; | |
3645 | if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */ | |
3646 | return false; | |
3647 | if (!tr.present) | |
3648 | return false; | |
3649 | ||
3650 | return true; | |
3651 | } | |
3652 | ||
3653 | static bool ldtr_valid(struct kvm_vcpu *vcpu) | |
3654 | { | |
3655 | struct kvm_segment ldtr; | |
3656 | ||
3657 | vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR); | |
3658 | ||
3659 | if (ldtr.unusable) | |
3660 | return true; | |
3661 | if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */ | |
3662 | return false; | |
3663 | if (ldtr.type != 2) | |
3664 | return false; | |
3665 | if (!ldtr.present) | |
3666 | return false; | |
3667 | ||
3668 | return true; | |
3669 | } | |
3670 | ||
3671 | static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) | |
3672 | { | |
3673 | struct kvm_segment cs, ss; | |
3674 | ||
3675 | vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); | |
3676 | vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); | |
3677 | ||
3678 | return ((cs.selector & SELECTOR_RPL_MASK) == | |
3679 | (ss.selector & SELECTOR_RPL_MASK)); | |
3680 | } | |
3681 | ||
3682 | /* | |
3683 | * Check if guest state is valid. Returns true if valid, false if | |
3684 | * not. | |
3685 | * We assume that registers are always usable | |
3686 | */ | |
3687 | static bool guest_state_valid(struct kvm_vcpu *vcpu) | |
3688 | { | |
3689 | if (enable_unrestricted_guest) | |
3690 | return true; | |
3691 | ||
3692 | /* real mode guest state checks */ | |
3693 | if (!is_protmode(vcpu) || (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) { | |
3694 | if (!rmode_segment_valid(vcpu, VCPU_SREG_CS)) | |
3695 | return false; | |
3696 | if (!rmode_segment_valid(vcpu, VCPU_SREG_SS)) | |
3697 | return false; | |
3698 | if (!rmode_segment_valid(vcpu, VCPU_SREG_DS)) | |
3699 | return false; | |
3700 | if (!rmode_segment_valid(vcpu, VCPU_SREG_ES)) | |
3701 | return false; | |
3702 | if (!rmode_segment_valid(vcpu, VCPU_SREG_FS)) | |
3703 | return false; | |
3704 | if (!rmode_segment_valid(vcpu, VCPU_SREG_GS)) | |
3705 | return false; | |
3706 | } else { | |
3707 | /* protected mode guest state checks */ | |
3708 | if (!cs_ss_rpl_check(vcpu)) | |
3709 | return false; | |
3710 | if (!code_segment_valid(vcpu)) | |
3711 | return false; | |
3712 | if (!stack_segment_valid(vcpu)) | |
3713 | return false; | |
3714 | if (!data_segment_valid(vcpu, VCPU_SREG_DS)) | |
3715 | return false; | |
3716 | if (!data_segment_valid(vcpu, VCPU_SREG_ES)) | |
3717 | return false; | |
3718 | if (!data_segment_valid(vcpu, VCPU_SREG_FS)) | |
3719 | return false; | |
3720 | if (!data_segment_valid(vcpu, VCPU_SREG_GS)) | |
3721 | return false; | |
3722 | if (!tr_valid(vcpu)) | |
3723 | return false; | |
3724 | if (!ldtr_valid(vcpu)) | |
3725 | return false; | |
3726 | } | |
3727 | /* TODO: | |
3728 | * - Add checks on RIP | |
3729 | * - Add checks on RFLAGS | |
3730 | */ | |
3731 | ||
3732 | return true; | |
3733 | } | |
3734 | ||
3735 | static int init_rmode_tss(struct kvm *kvm) | |
3736 | { | |
3737 | gfn_t fn; | |
3738 | u16 data = 0; | |
3739 | int r, idx, ret = 0; | |
3740 | ||
3741 | idx = srcu_read_lock(&kvm->srcu); | |
3742 | fn = kvm->arch.tss_addr >> PAGE_SHIFT; | |
3743 | r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); | |
3744 | if (r < 0) | |
3745 | goto out; | |
3746 | data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; | |
3747 | r = kvm_write_guest_page(kvm, fn++, &data, | |
3748 | TSS_IOPB_BASE_OFFSET, sizeof(u16)); | |
3749 | if (r < 0) | |
3750 | goto out; | |
3751 | r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); | |
3752 | if (r < 0) | |
3753 | goto out; | |
3754 | r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); | |
3755 | if (r < 0) | |
3756 | goto out; | |
3757 | data = ~0; | |
3758 | r = kvm_write_guest_page(kvm, fn, &data, | |
3759 | RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, | |
3760 | sizeof(u8)); | |
3761 | if (r < 0) | |
3762 | goto out; | |
3763 | ||
3764 | ret = 1; | |
3765 | out: | |
3766 | srcu_read_unlock(&kvm->srcu, idx); | |
3767 | return ret; | |
3768 | } | |
3769 | ||
3770 | static int init_rmode_identity_map(struct kvm *kvm) | |
3771 | { | |
3772 | int i, idx, r, ret; | |
3773 | pfn_t identity_map_pfn; | |
3774 | u32 tmp; | |
3775 | ||
3776 | if (!enable_ept) | |
3777 | return 1; | |
3778 | if (unlikely(!kvm->arch.ept_identity_pagetable)) { | |
3779 | printk(KERN_ERR "EPT: identity-mapping pagetable " | |
3780 | "haven't been allocated!\n"); | |
3781 | return 0; | |
3782 | } | |
3783 | if (likely(kvm->arch.ept_identity_pagetable_done)) | |
3784 | return 1; | |
3785 | ret = 0; | |
3786 | identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT; | |
3787 | idx = srcu_read_lock(&kvm->srcu); | |
3788 | r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); | |
3789 | if (r < 0) | |
3790 | goto out; | |
3791 | /* Set up identity-mapping pagetable for EPT in real mode */ | |
3792 | for (i = 0; i < PT32_ENT_PER_PAGE; i++) { | |
3793 | tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | | |
3794 | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); | |
3795 | r = kvm_write_guest_page(kvm, identity_map_pfn, | |
3796 | &tmp, i * sizeof(tmp), sizeof(tmp)); | |
3797 | if (r < 0) | |
3798 | goto out; | |
3799 | } | |
3800 | kvm->arch.ept_identity_pagetable_done = true; | |
3801 | ret = 1; | |
3802 | out: | |
3803 | srcu_read_unlock(&kvm->srcu, idx); | |
3804 | return ret; | |
3805 | } | |
3806 | ||
3807 | static void seg_setup(int seg) | |
3808 | { | |
3809 | const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
3810 | unsigned int ar; | |
3811 | ||
3812 | vmcs_write16(sf->selector, 0); | |
3813 | vmcs_writel(sf->base, 0); | |
3814 | vmcs_write32(sf->limit, 0xffff); | |
3815 | ar = 0x93; | |
3816 | if (seg == VCPU_SREG_CS) | |
3817 | ar |= 0x08; /* code segment */ | |
3818 | ||
3819 | vmcs_write32(sf->ar_bytes, ar); | |
3820 | } | |
3821 | ||
3822 | static int alloc_apic_access_page(struct kvm *kvm) | |
3823 | { | |
3824 | struct page *page; | |
3825 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3826 | int r = 0; | |
3827 | ||
3828 | mutex_lock(&kvm->slots_lock); | |
3829 | if (kvm->arch.apic_access_page) | |
3830 | goto out; | |
3831 | kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT; | |
3832 | kvm_userspace_mem.flags = 0; | |
3833 | kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL; | |
3834 | kvm_userspace_mem.memory_size = PAGE_SIZE; | |
3835 | r = __kvm_set_memory_region(kvm, &kvm_userspace_mem); | |
3836 | if (r) | |
3837 | goto out; | |
3838 | ||
3839 | page = gfn_to_page(kvm, 0xfee00); | |
3840 | if (is_error_page(page)) { | |
3841 | r = -EFAULT; | |
3842 | goto out; | |
3843 | } | |
3844 | ||
3845 | kvm->arch.apic_access_page = page; | |
3846 | out: | |
3847 | mutex_unlock(&kvm->slots_lock); | |
3848 | return r; | |
3849 | } | |
3850 | ||
3851 | static int alloc_identity_pagetable(struct kvm *kvm) | |
3852 | { | |
3853 | struct page *page; | |
3854 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3855 | int r = 0; | |
3856 | ||
3857 | mutex_lock(&kvm->slots_lock); | |
3858 | if (kvm->arch.ept_identity_pagetable) | |
3859 | goto out; | |
3860 | kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT; | |
3861 | kvm_userspace_mem.flags = 0; | |
3862 | kvm_userspace_mem.guest_phys_addr = | |
3863 | kvm->arch.ept_identity_map_addr; | |
3864 | kvm_userspace_mem.memory_size = PAGE_SIZE; | |
3865 | r = __kvm_set_memory_region(kvm, &kvm_userspace_mem); | |
3866 | if (r) | |
3867 | goto out; | |
3868 | ||
3869 | page = gfn_to_page(kvm, kvm->arch.ept_identity_map_addr >> PAGE_SHIFT); | |
3870 | if (is_error_page(page)) { | |
3871 | r = -EFAULT; | |
3872 | goto out; | |
3873 | } | |
3874 | ||
3875 | kvm->arch.ept_identity_pagetable = page; | |
3876 | out: | |
3877 | mutex_unlock(&kvm->slots_lock); | |
3878 | return r; | |
3879 | } | |
3880 | ||
3881 | static void allocate_vpid(struct vcpu_vmx *vmx) | |
3882 | { | |
3883 | int vpid; | |
3884 | ||
3885 | vmx->vpid = 0; | |
3886 | if (!enable_vpid) | |
3887 | return; | |
3888 | spin_lock(&vmx_vpid_lock); | |
3889 | vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS); | |
3890 | if (vpid < VMX_NR_VPIDS) { | |
3891 | vmx->vpid = vpid; | |
3892 | __set_bit(vpid, vmx_vpid_bitmap); | |
3893 | } | |
3894 | spin_unlock(&vmx_vpid_lock); | |
3895 | } | |
3896 | ||
3897 | static void free_vpid(struct vcpu_vmx *vmx) | |
3898 | { | |
3899 | if (!enable_vpid) | |
3900 | return; | |
3901 | spin_lock(&vmx_vpid_lock); | |
3902 | if (vmx->vpid != 0) | |
3903 | __clear_bit(vmx->vpid, vmx_vpid_bitmap); | |
3904 | spin_unlock(&vmx_vpid_lock); | |
3905 | } | |
3906 | ||
3907 | #define MSR_TYPE_R 1 | |
3908 | #define MSR_TYPE_W 2 | |
3909 | static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, | |
3910 | u32 msr, int type) | |
3911 | { | |
3912 | int f = sizeof(unsigned long); | |
3913 | ||
3914 | if (!cpu_has_vmx_msr_bitmap()) | |
3915 | return; | |
3916 | ||
3917 | /* | |
3918 | * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals | |
3919 | * have the write-low and read-high bitmap offsets the wrong way round. | |
3920 | * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. | |
3921 | */ | |
3922 | if (msr <= 0x1fff) { | |
3923 | if (type & MSR_TYPE_R) | |
3924 | /* read-low */ | |
3925 | __clear_bit(msr, msr_bitmap + 0x000 / f); | |
3926 | ||
3927 | if (type & MSR_TYPE_W) | |
3928 | /* write-low */ | |
3929 | __clear_bit(msr, msr_bitmap + 0x800 / f); | |
3930 | ||
3931 | } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { | |
3932 | msr &= 0x1fff; | |
3933 | if (type & MSR_TYPE_R) | |
3934 | /* read-high */ | |
3935 | __clear_bit(msr, msr_bitmap + 0x400 / f); | |
3936 | ||
3937 | if (type & MSR_TYPE_W) | |
3938 | /* write-high */ | |
3939 | __clear_bit(msr, msr_bitmap + 0xc00 / f); | |
3940 | ||
3941 | } | |
3942 | } | |
3943 | ||
3944 | static void __vmx_enable_intercept_for_msr(unsigned long *msr_bitmap, | |
3945 | u32 msr, int type) | |
3946 | { | |
3947 | int f = sizeof(unsigned long); | |
3948 | ||
3949 | if (!cpu_has_vmx_msr_bitmap()) | |
3950 | return; | |
3951 | ||
3952 | /* | |
3953 | * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals | |
3954 | * have the write-low and read-high bitmap offsets the wrong way round. | |
3955 | * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. | |
3956 | */ | |
3957 | if (msr <= 0x1fff) { | |
3958 | if (type & MSR_TYPE_R) | |
3959 | /* read-low */ | |
3960 | __set_bit(msr, msr_bitmap + 0x000 / f); | |
3961 | ||
3962 | if (type & MSR_TYPE_W) | |
3963 | /* write-low */ | |
3964 | __set_bit(msr, msr_bitmap + 0x800 / f); | |
3965 | ||
3966 | } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { | |
3967 | msr &= 0x1fff; | |
3968 | if (type & MSR_TYPE_R) | |
3969 | /* read-high */ | |
3970 | __set_bit(msr, msr_bitmap + 0x400 / f); | |
3971 | ||
3972 | if (type & MSR_TYPE_W) | |
3973 | /* write-high */ | |
3974 | __set_bit(msr, msr_bitmap + 0xc00 / f); | |
3975 | ||
3976 | } | |
3977 | } | |
3978 | ||
3979 | static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only) | |
3980 | { | |
3981 | if (!longmode_only) | |
3982 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, | |
3983 | msr, MSR_TYPE_R | MSR_TYPE_W); | |
3984 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, | |
3985 | msr, MSR_TYPE_R | MSR_TYPE_W); | |
3986 | } | |
3987 | ||
3988 | static void vmx_enable_intercept_msr_read_x2apic(u32 msr) | |
3989 | { | |
3990 | __vmx_enable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic, | |
3991 | msr, MSR_TYPE_R); | |
3992 | __vmx_enable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic, | |
3993 | msr, MSR_TYPE_R); | |
3994 | } | |
3995 | ||
3996 | static void vmx_disable_intercept_msr_read_x2apic(u32 msr) | |
3997 | { | |
3998 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic, | |
3999 | msr, MSR_TYPE_R); | |
4000 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic, | |
4001 | msr, MSR_TYPE_R); | |
4002 | } | |
4003 | ||
4004 | static void vmx_disable_intercept_msr_write_x2apic(u32 msr) | |
4005 | { | |
4006 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy_x2apic, | |
4007 | msr, MSR_TYPE_W); | |
4008 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode_x2apic, | |
4009 | msr, MSR_TYPE_W); | |
4010 | } | |
4011 | ||
4012 | static int vmx_vm_has_apicv(struct kvm *kvm) | |
4013 | { | |
4014 | return enable_apicv && irqchip_in_kernel(kvm); | |
4015 | } | |
4016 | ||
4017 | /* | |
4018 | * Send interrupt to vcpu via posted interrupt way. | |
4019 | * 1. If target vcpu is running(non-root mode), send posted interrupt | |
4020 | * notification to vcpu and hardware will sync PIR to vIRR atomically. | |
4021 | * 2. If target vcpu isn't running(root mode), kick it to pick up the | |
4022 | * interrupt from PIR in next vmentry. | |
4023 | */ | |
4024 | static void vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector) | |
4025 | { | |
4026 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4027 | int r; | |
4028 | ||
4029 | if (pi_test_and_set_pir(vector, &vmx->pi_desc)) | |
4030 | return; | |
4031 | ||
4032 | r = pi_test_and_set_on(&vmx->pi_desc); | |
4033 | kvm_make_request(KVM_REQ_EVENT, vcpu); | |
4034 | #ifdef CONFIG_SMP | |
4035 | if (!r && (vcpu->mode == IN_GUEST_MODE)) | |
4036 | apic->send_IPI_mask(get_cpu_mask(vcpu->cpu), | |
4037 | POSTED_INTR_VECTOR); | |
4038 | else | |
4039 | #endif | |
4040 | kvm_vcpu_kick(vcpu); | |
4041 | } | |
4042 | ||
4043 | static void vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu) | |
4044 | { | |
4045 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4046 | ||
4047 | if (!pi_test_and_clear_on(&vmx->pi_desc)) | |
4048 | return; | |
4049 | ||
4050 | kvm_apic_update_irr(vcpu, vmx->pi_desc.pir); | |
4051 | } | |
4052 | ||
4053 | static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu) | |
4054 | { | |
4055 | return; | |
4056 | } | |
4057 | ||
4058 | /* | |
4059 | * Set up the vmcs's constant host-state fields, i.e., host-state fields that | |
4060 | * will not change in the lifetime of the guest. | |
4061 | * Note that host-state that does change is set elsewhere. E.g., host-state | |
4062 | * that is set differently for each CPU is set in vmx_vcpu_load(), not here. | |
4063 | */ | |
4064 | static void vmx_set_constant_host_state(struct vcpu_vmx *vmx) | |
4065 | { | |
4066 | u32 low32, high32; | |
4067 | unsigned long tmpl; | |
4068 | struct desc_ptr dt; | |
4069 | ||
4070 | vmcs_writel(HOST_CR0, read_cr0() & ~X86_CR0_TS); /* 22.2.3 */ | |
4071 | vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */ | |
4072 | vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */ | |
4073 | ||
4074 | vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */ | |
4075 | #ifdef CONFIG_X86_64 | |
4076 | /* | |
4077 | * Load null selectors, so we can avoid reloading them in | |
4078 | * __vmx_load_host_state(), in case userspace uses the null selectors | |
4079 | * too (the expected case). | |
4080 | */ | |
4081 | vmcs_write16(HOST_DS_SELECTOR, 0); | |
4082 | vmcs_write16(HOST_ES_SELECTOR, 0); | |
4083 | #else | |
4084 | vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ | |
4085 | vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */ | |
4086 | #endif | |
4087 | vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ | |
4088 | vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */ | |
4089 | ||
4090 | native_store_idt(&dt); | |
4091 | vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */ | |
4092 | vmx->host_idt_base = dt.address; | |
4093 | ||
4094 | vmcs_writel(HOST_RIP, vmx_return); /* 22.2.5 */ | |
4095 | ||
4096 | rdmsr(MSR_IA32_SYSENTER_CS, low32, high32); | |
4097 | vmcs_write32(HOST_IA32_SYSENTER_CS, low32); | |
4098 | rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl); | |
4099 | vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl); /* 22.2.3 */ | |
4100 | ||
4101 | if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) { | |
4102 | rdmsr(MSR_IA32_CR_PAT, low32, high32); | |
4103 | vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32)); | |
4104 | } | |
4105 | } | |
4106 | ||
4107 | static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx) | |
4108 | { | |
4109 | vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS; | |
4110 | if (enable_ept) | |
4111 | vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE; | |
4112 | if (is_guest_mode(&vmx->vcpu)) | |
4113 | vmx->vcpu.arch.cr4_guest_owned_bits &= | |
4114 | ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask; | |
4115 | vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits); | |
4116 | } | |
4117 | ||
4118 | static u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx) | |
4119 | { | |
4120 | u32 pin_based_exec_ctrl = vmcs_config.pin_based_exec_ctrl; | |
4121 | ||
4122 | if (!vmx_vm_has_apicv(vmx->vcpu.kvm)) | |
4123 | pin_based_exec_ctrl &= ~PIN_BASED_POSTED_INTR; | |
4124 | return pin_based_exec_ctrl; | |
4125 | } | |
4126 | ||
4127 | static u32 vmx_exec_control(struct vcpu_vmx *vmx) | |
4128 | { | |
4129 | u32 exec_control = vmcs_config.cpu_based_exec_ctrl; | |
4130 | if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) { | |
4131 | exec_control &= ~CPU_BASED_TPR_SHADOW; | |
4132 | #ifdef CONFIG_X86_64 | |
4133 | exec_control |= CPU_BASED_CR8_STORE_EXITING | | |
4134 | CPU_BASED_CR8_LOAD_EXITING; | |
4135 | #endif | |
4136 | } | |
4137 | if (!enable_ept) | |
4138 | exec_control |= CPU_BASED_CR3_STORE_EXITING | | |
4139 | CPU_BASED_CR3_LOAD_EXITING | | |
4140 | CPU_BASED_INVLPG_EXITING; | |
4141 | return exec_control; | |
4142 | } | |
4143 | ||
4144 | static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx) | |
4145 | { | |
4146 | u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl; | |
4147 | if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) | |
4148 | exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
4149 | if (vmx->vpid == 0) | |
4150 | exec_control &= ~SECONDARY_EXEC_ENABLE_VPID; | |
4151 | if (!enable_ept) { | |
4152 | exec_control &= ~SECONDARY_EXEC_ENABLE_EPT; | |
4153 | enable_unrestricted_guest = 0; | |
4154 | /* Enable INVPCID for non-ept guests may cause performance regression. */ | |
4155 | exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID; | |
4156 | } | |
4157 | if (!enable_unrestricted_guest) | |
4158 | exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; | |
4159 | if (!ple_gap) | |
4160 | exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; | |
4161 | if (!vmx_vm_has_apicv(vmx->vcpu.kvm)) | |
4162 | exec_control &= ~(SECONDARY_EXEC_APIC_REGISTER_VIRT | | |
4163 | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY); | |
4164 | exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; | |
4165 | /* SECONDARY_EXEC_SHADOW_VMCS is enabled when L1 executes VMPTRLD | |
4166 | (handle_vmptrld). | |
4167 | We can NOT enable shadow_vmcs here because we don't have yet | |
4168 | a current VMCS12 | |
4169 | */ | |
4170 | exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS; | |
4171 | return exec_control; | |
4172 | } | |
4173 | ||
4174 | static void ept_set_mmio_spte_mask(void) | |
4175 | { | |
4176 | /* | |
4177 | * EPT Misconfigurations can be generated if the value of bits 2:0 | |
4178 | * of an EPT paging-structure entry is 110b (write/execute). | |
4179 | * Also, magic bits (0xffull << 49) is set to quickly identify mmio | |
4180 | * spte. | |
4181 | */ | |
4182 | kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull); | |
4183 | } | |
4184 | ||
4185 | /* | |
4186 | * Sets up the vmcs for emulated real mode. | |
4187 | */ | |
4188 | static int vmx_vcpu_setup(struct vcpu_vmx *vmx) | |
4189 | { | |
4190 | #ifdef CONFIG_X86_64 | |
4191 | unsigned long a; | |
4192 | #endif | |
4193 | int i; | |
4194 | ||
4195 | /* I/O */ | |
4196 | vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a)); | |
4197 | vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b)); | |
4198 | ||
4199 | if (enable_shadow_vmcs) { | |
4200 | vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap)); | |
4201 | vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap)); | |
4202 | } | |
4203 | if (cpu_has_vmx_msr_bitmap()) | |
4204 | vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy)); | |
4205 | ||
4206 | vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ | |
4207 | ||
4208 | /* Control */ | |
4209 | vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_ctrl(vmx)); | |
4210 | ||
4211 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx)); | |
4212 | ||
4213 | if (cpu_has_secondary_exec_ctrls()) { | |
4214 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, | |
4215 | vmx_secondary_exec_control(vmx)); | |
4216 | } | |
4217 | ||
4218 | if (vmx_vm_has_apicv(vmx->vcpu.kvm)) { | |
4219 | vmcs_write64(EOI_EXIT_BITMAP0, 0); | |
4220 | vmcs_write64(EOI_EXIT_BITMAP1, 0); | |
4221 | vmcs_write64(EOI_EXIT_BITMAP2, 0); | |
4222 | vmcs_write64(EOI_EXIT_BITMAP3, 0); | |
4223 | ||
4224 | vmcs_write16(GUEST_INTR_STATUS, 0); | |
4225 | ||
4226 | vmcs_write64(POSTED_INTR_NV, POSTED_INTR_VECTOR); | |
4227 | vmcs_write64(POSTED_INTR_DESC_ADDR, __pa((&vmx->pi_desc))); | |
4228 | } | |
4229 | ||
4230 | if (ple_gap) { | |
4231 | vmcs_write32(PLE_GAP, ple_gap); | |
4232 | vmcs_write32(PLE_WINDOW, ple_window); | |
4233 | } | |
4234 | ||
4235 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); | |
4236 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); | |
4237 | vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */ | |
4238 | ||
4239 | vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */ | |
4240 | vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */ | |
4241 | vmx_set_constant_host_state(vmx); | |
4242 | #ifdef CONFIG_X86_64 | |
4243 | rdmsrl(MSR_FS_BASE, a); | |
4244 | vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */ | |
4245 | rdmsrl(MSR_GS_BASE, a); | |
4246 | vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */ | |
4247 | #else | |
4248 | vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ | |
4249 | vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ | |
4250 | #endif | |
4251 | ||
4252 | vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); | |
4253 | vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); | |
4254 | vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host)); | |
4255 | vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); | |
4256 | vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest)); | |
4257 | ||
4258 | if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { | |
4259 | u32 msr_low, msr_high; | |
4260 | u64 host_pat; | |
4261 | rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high); | |
4262 | host_pat = msr_low | ((u64) msr_high << 32); | |
4263 | /* Write the default value follow host pat */ | |
4264 | vmcs_write64(GUEST_IA32_PAT, host_pat); | |
4265 | /* Keep arch.pat sync with GUEST_IA32_PAT */ | |
4266 | vmx->vcpu.arch.pat = host_pat; | |
4267 | } | |
4268 | ||
4269 | for (i = 0; i < NR_VMX_MSR; ++i) { | |
4270 | u32 index = vmx_msr_index[i]; | |
4271 | u32 data_low, data_high; | |
4272 | int j = vmx->nmsrs; | |
4273 | ||
4274 | if (rdmsr_safe(index, &data_low, &data_high) < 0) | |
4275 | continue; | |
4276 | if (wrmsr_safe(index, data_low, data_high) < 0) | |
4277 | continue; | |
4278 | vmx->guest_msrs[j].index = i; | |
4279 | vmx->guest_msrs[j].data = 0; | |
4280 | vmx->guest_msrs[j].mask = -1ull; | |
4281 | ++vmx->nmsrs; | |
4282 | } | |
4283 | ||
4284 | vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl); | |
4285 | ||
4286 | /* 22.2.1, 20.8.1 */ | |
4287 | vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl); | |
4288 | ||
4289 | vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL); | |
4290 | set_cr4_guest_host_mask(vmx); | |
4291 | ||
4292 | return 0; | |
4293 | } | |
4294 | ||
4295 | static void vmx_vcpu_reset(struct kvm_vcpu *vcpu) | |
4296 | { | |
4297 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4298 | u64 msr; | |
4299 | ||
4300 | vmx->rmode.vm86_active = 0; | |
4301 | ||
4302 | vmx->soft_vnmi_blocked = 0; | |
4303 | ||
4304 | vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val(); | |
4305 | kvm_set_cr8(&vmx->vcpu, 0); | |
4306 | msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE; | |
4307 | if (kvm_vcpu_is_bsp(&vmx->vcpu)) | |
4308 | msr |= MSR_IA32_APICBASE_BSP; | |
4309 | kvm_set_apic_base(&vmx->vcpu, msr); | |
4310 | ||
4311 | vmx_segment_cache_clear(vmx); | |
4312 | ||
4313 | seg_setup(VCPU_SREG_CS); | |
4314 | vmcs_write16(GUEST_CS_SELECTOR, 0xf000); | |
4315 | vmcs_write32(GUEST_CS_BASE, 0xffff0000); | |
4316 | ||
4317 | seg_setup(VCPU_SREG_DS); | |
4318 | seg_setup(VCPU_SREG_ES); | |
4319 | seg_setup(VCPU_SREG_FS); | |
4320 | seg_setup(VCPU_SREG_GS); | |
4321 | seg_setup(VCPU_SREG_SS); | |
4322 | ||
4323 | vmcs_write16(GUEST_TR_SELECTOR, 0); | |
4324 | vmcs_writel(GUEST_TR_BASE, 0); | |
4325 | vmcs_write32(GUEST_TR_LIMIT, 0xffff); | |
4326 | vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); | |
4327 | ||
4328 | vmcs_write16(GUEST_LDTR_SELECTOR, 0); | |
4329 | vmcs_writel(GUEST_LDTR_BASE, 0); | |
4330 | vmcs_write32(GUEST_LDTR_LIMIT, 0xffff); | |
4331 | vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082); | |
4332 | ||
4333 | vmcs_write32(GUEST_SYSENTER_CS, 0); | |
4334 | vmcs_writel(GUEST_SYSENTER_ESP, 0); | |
4335 | vmcs_writel(GUEST_SYSENTER_EIP, 0); | |
4336 | ||
4337 | vmcs_writel(GUEST_RFLAGS, 0x02); | |
4338 | kvm_rip_write(vcpu, 0xfff0); | |
4339 | ||
4340 | vmcs_writel(GUEST_GDTR_BASE, 0); | |
4341 | vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); | |
4342 | ||
4343 | vmcs_writel(GUEST_IDTR_BASE, 0); | |
4344 | vmcs_write32(GUEST_IDTR_LIMIT, 0xffff); | |
4345 | ||
4346 | vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE); | |
4347 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0); | |
4348 | vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0); | |
4349 | ||
4350 | /* Special registers */ | |
4351 | vmcs_write64(GUEST_IA32_DEBUGCTL, 0); | |
4352 | ||
4353 | setup_msrs(vmx); | |
4354 | ||
4355 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ | |
4356 | ||
4357 | if (cpu_has_vmx_tpr_shadow()) { | |
4358 | vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); | |
4359 | if (vm_need_tpr_shadow(vmx->vcpu.kvm)) | |
4360 | vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, | |
4361 | __pa(vmx->vcpu.arch.apic->regs)); | |
4362 | vmcs_write32(TPR_THRESHOLD, 0); | |
4363 | } | |
4364 | ||
4365 | if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) | |
4366 | vmcs_write64(APIC_ACCESS_ADDR, | |
4367 | page_to_phys(vmx->vcpu.kvm->arch.apic_access_page)); | |
4368 | ||
4369 | if (vmx_vm_has_apicv(vcpu->kvm)) | |
4370 | memset(&vmx->pi_desc, 0, sizeof(struct pi_desc)); | |
4371 | ||
4372 | if (vmx->vpid != 0) | |
4373 | vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); | |
4374 | ||
4375 | vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; | |
4376 | vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */ | |
4377 | vmx_set_cr4(&vmx->vcpu, 0); | |
4378 | vmx_set_efer(&vmx->vcpu, 0); | |
4379 | vmx_fpu_activate(&vmx->vcpu); | |
4380 | update_exception_bitmap(&vmx->vcpu); | |
4381 | ||
4382 | vpid_sync_context(vmx); | |
4383 | } | |
4384 | ||
4385 | /* | |
4386 | * In nested virtualization, check if L1 asked to exit on external interrupts. | |
4387 | * For most existing hypervisors, this will always return true. | |
4388 | */ | |
4389 | static bool nested_exit_on_intr(struct kvm_vcpu *vcpu) | |
4390 | { | |
4391 | return get_vmcs12(vcpu)->pin_based_vm_exec_control & | |
4392 | PIN_BASED_EXT_INTR_MASK; | |
4393 | } | |
4394 | ||
4395 | static void enable_irq_window(struct kvm_vcpu *vcpu) | |
4396 | { | |
4397 | u32 cpu_based_vm_exec_control; | |
4398 | if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) { | |
4399 | /* | |
4400 | * We get here if vmx_interrupt_allowed() said we can't | |
4401 | * inject to L1 now because L2 must run. Ask L2 to exit | |
4402 | * right after entry, so we can inject to L1 more promptly. | |
4403 | */ | |
4404 | kvm_make_request(KVM_REQ_IMMEDIATE_EXIT, vcpu); | |
4405 | return; | |
4406 | } | |
4407 | ||
4408 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
4409 | cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING; | |
4410 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
4411 | } | |
4412 | ||
4413 | static void enable_nmi_window(struct kvm_vcpu *vcpu) | |
4414 | { | |
4415 | u32 cpu_based_vm_exec_control; | |
4416 | ||
4417 | if (!cpu_has_virtual_nmis()) { | |
4418 | enable_irq_window(vcpu); | |
4419 | return; | |
4420 | } | |
4421 | ||
4422 | if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) { | |
4423 | enable_irq_window(vcpu); | |
4424 | return; | |
4425 | } | |
4426 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
4427 | cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING; | |
4428 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
4429 | } | |
4430 | ||
4431 | static void vmx_inject_irq(struct kvm_vcpu *vcpu) | |
4432 | { | |
4433 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4434 | uint32_t intr; | |
4435 | int irq = vcpu->arch.interrupt.nr; | |
4436 | ||
4437 | trace_kvm_inj_virq(irq); | |
4438 | ||
4439 | ++vcpu->stat.irq_injections; | |
4440 | if (vmx->rmode.vm86_active) { | |
4441 | int inc_eip = 0; | |
4442 | if (vcpu->arch.interrupt.soft) | |
4443 | inc_eip = vcpu->arch.event_exit_inst_len; | |
4444 | if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE) | |
4445 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); | |
4446 | return; | |
4447 | } | |
4448 | intr = irq | INTR_INFO_VALID_MASK; | |
4449 | if (vcpu->arch.interrupt.soft) { | |
4450 | intr |= INTR_TYPE_SOFT_INTR; | |
4451 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, | |
4452 | vmx->vcpu.arch.event_exit_inst_len); | |
4453 | } else | |
4454 | intr |= INTR_TYPE_EXT_INTR; | |
4455 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr); | |
4456 | } | |
4457 | ||
4458 | static void vmx_inject_nmi(struct kvm_vcpu *vcpu) | |
4459 | { | |
4460 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4461 | ||
4462 | if (is_guest_mode(vcpu)) | |
4463 | return; | |
4464 | ||
4465 | if (!cpu_has_virtual_nmis()) { | |
4466 | /* | |
4467 | * Tracking the NMI-blocked state in software is built upon | |
4468 | * finding the next open IRQ window. This, in turn, depends on | |
4469 | * well-behaving guests: They have to keep IRQs disabled at | |
4470 | * least as long as the NMI handler runs. Otherwise we may | |
4471 | * cause NMI nesting, maybe breaking the guest. But as this is | |
4472 | * highly unlikely, we can live with the residual risk. | |
4473 | */ | |
4474 | vmx->soft_vnmi_blocked = 1; | |
4475 | vmx->vnmi_blocked_time = 0; | |
4476 | } | |
4477 | ||
4478 | ++vcpu->stat.nmi_injections; | |
4479 | vmx->nmi_known_unmasked = false; | |
4480 | if (vmx->rmode.vm86_active) { | |
4481 | if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE) | |
4482 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); | |
4483 | return; | |
4484 | } | |
4485 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, | |
4486 | INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR); | |
4487 | } | |
4488 | ||
4489 | static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) | |
4490 | { | |
4491 | if (!cpu_has_virtual_nmis()) | |
4492 | return to_vmx(vcpu)->soft_vnmi_blocked; | |
4493 | if (to_vmx(vcpu)->nmi_known_unmasked) | |
4494 | return false; | |
4495 | return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI; | |
4496 | } | |
4497 | ||
4498 | static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked) | |
4499 | { | |
4500 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4501 | ||
4502 | if (!cpu_has_virtual_nmis()) { | |
4503 | if (vmx->soft_vnmi_blocked != masked) { | |
4504 | vmx->soft_vnmi_blocked = masked; | |
4505 | vmx->vnmi_blocked_time = 0; | |
4506 | } | |
4507 | } else { | |
4508 | vmx->nmi_known_unmasked = !masked; | |
4509 | if (masked) | |
4510 | vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, | |
4511 | GUEST_INTR_STATE_NMI); | |
4512 | else | |
4513 | vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, | |
4514 | GUEST_INTR_STATE_NMI); | |
4515 | } | |
4516 | } | |
4517 | ||
4518 | static int vmx_nmi_allowed(struct kvm_vcpu *vcpu) | |
4519 | { | |
4520 | if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked) | |
4521 | return 0; | |
4522 | ||
4523 | return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & | |
4524 | (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI | |
4525 | | GUEST_INTR_STATE_NMI)); | |
4526 | } | |
4527 | ||
4528 | static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu) | |
4529 | { | |
4530 | if (is_guest_mode(vcpu)) { | |
4531 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
4532 | ||
4533 | if (to_vmx(vcpu)->nested.nested_run_pending) | |
4534 | return 0; | |
4535 | if (nested_exit_on_intr(vcpu)) { | |
4536 | nested_vmx_vmexit(vcpu); | |
4537 | vmcs12->vm_exit_reason = | |
4538 | EXIT_REASON_EXTERNAL_INTERRUPT; | |
4539 | vmcs12->vm_exit_intr_info = 0; | |
4540 | /* | |
4541 | * fall through to normal code, but now in L1, not L2 | |
4542 | */ | |
4543 | } | |
4544 | } | |
4545 | ||
4546 | return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) && | |
4547 | !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & | |
4548 | (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)); | |
4549 | } | |
4550 | ||
4551 | static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) | |
4552 | { | |
4553 | int ret; | |
4554 | struct kvm_userspace_memory_region tss_mem = { | |
4555 | .slot = TSS_PRIVATE_MEMSLOT, | |
4556 | .guest_phys_addr = addr, | |
4557 | .memory_size = PAGE_SIZE * 3, | |
4558 | .flags = 0, | |
4559 | }; | |
4560 | ||
4561 | ret = kvm_set_memory_region(kvm, &tss_mem); | |
4562 | if (ret) | |
4563 | return ret; | |
4564 | kvm->arch.tss_addr = addr; | |
4565 | if (!init_rmode_tss(kvm)) | |
4566 | return -ENOMEM; | |
4567 | ||
4568 | return 0; | |
4569 | } | |
4570 | ||
4571 | static bool rmode_exception(struct kvm_vcpu *vcpu, int vec) | |
4572 | { | |
4573 | switch (vec) { | |
4574 | case BP_VECTOR: | |
4575 | /* | |
4576 | * Update instruction length as we may reinject the exception | |
4577 | * from user space while in guest debugging mode. | |
4578 | */ | |
4579 | to_vmx(vcpu)->vcpu.arch.event_exit_inst_len = | |
4580 | vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
4581 | if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) | |
4582 | return false; | |
4583 | /* fall through */ | |
4584 | case DB_VECTOR: | |
4585 | if (vcpu->guest_debug & | |
4586 | (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) | |
4587 | return false; | |
4588 | /* fall through */ | |
4589 | case DE_VECTOR: | |
4590 | case OF_VECTOR: | |
4591 | case BR_VECTOR: | |
4592 | case UD_VECTOR: | |
4593 | case DF_VECTOR: | |
4594 | case SS_VECTOR: | |
4595 | case GP_VECTOR: | |
4596 | case MF_VECTOR: | |
4597 | return true; | |
4598 | break; | |
4599 | } | |
4600 | return false; | |
4601 | } | |
4602 | ||
4603 | static int handle_rmode_exception(struct kvm_vcpu *vcpu, | |
4604 | int vec, u32 err_code) | |
4605 | { | |
4606 | /* | |
4607 | * Instruction with address size override prefix opcode 0x67 | |
4608 | * Cause the #SS fault with 0 error code in VM86 mode. | |
4609 | */ | |
4610 | if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) { | |
4611 | if (emulate_instruction(vcpu, 0) == EMULATE_DONE) { | |
4612 | if (vcpu->arch.halt_request) { | |
4613 | vcpu->arch.halt_request = 0; | |
4614 | return kvm_emulate_halt(vcpu); | |
4615 | } | |
4616 | return 1; | |
4617 | } | |
4618 | return 0; | |
4619 | } | |
4620 | ||
4621 | /* | |
4622 | * Forward all other exceptions that are valid in real mode. | |
4623 | * FIXME: Breaks guest debugging in real mode, needs to be fixed with | |
4624 | * the required debugging infrastructure rework. | |
4625 | */ | |
4626 | kvm_queue_exception(vcpu, vec); | |
4627 | return 1; | |
4628 | } | |
4629 | ||
4630 | /* | |
4631 | * Trigger machine check on the host. We assume all the MSRs are already set up | |
4632 | * by the CPU and that we still run on the same CPU as the MCE occurred on. | |
4633 | * We pass a fake environment to the machine check handler because we want | |
4634 | * the guest to be always treated like user space, no matter what context | |
4635 | * it used internally. | |
4636 | */ | |
4637 | static void kvm_machine_check(void) | |
4638 | { | |
4639 | #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64) | |
4640 | struct pt_regs regs = { | |
4641 | .cs = 3, /* Fake ring 3 no matter what the guest ran on */ | |
4642 | .flags = X86_EFLAGS_IF, | |
4643 | }; | |
4644 | ||
4645 | do_machine_check(®s, 0); | |
4646 | #endif | |
4647 | } | |
4648 | ||
4649 | static int handle_machine_check(struct kvm_vcpu *vcpu) | |
4650 | { | |
4651 | /* already handled by vcpu_run */ | |
4652 | return 1; | |
4653 | } | |
4654 | ||
4655 | static int handle_exception(struct kvm_vcpu *vcpu) | |
4656 | { | |
4657 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
4658 | struct kvm_run *kvm_run = vcpu->run; | |
4659 | u32 intr_info, ex_no, error_code; | |
4660 | unsigned long cr2, rip, dr6; | |
4661 | u32 vect_info; | |
4662 | enum emulation_result er; | |
4663 | ||
4664 | vect_info = vmx->idt_vectoring_info; | |
4665 | intr_info = vmx->exit_intr_info; | |
4666 | ||
4667 | if (is_machine_check(intr_info)) | |
4668 | return handle_machine_check(vcpu); | |
4669 | ||
4670 | if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR) | |
4671 | return 1; /* already handled by vmx_vcpu_run() */ | |
4672 | ||
4673 | if (is_no_device(intr_info)) { | |
4674 | vmx_fpu_activate(vcpu); | |
4675 | return 1; | |
4676 | } | |
4677 | ||
4678 | if (is_invalid_opcode(intr_info)) { | |
4679 | er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD); | |
4680 | if (er != EMULATE_DONE) | |
4681 | kvm_queue_exception(vcpu, UD_VECTOR); | |
4682 | return 1; | |
4683 | } | |
4684 | ||
4685 | error_code = 0; | |
4686 | if (intr_info & INTR_INFO_DELIVER_CODE_MASK) | |
4687 | error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); | |
4688 | ||
4689 | /* | |
4690 | * The #PF with PFEC.RSVD = 1 indicates the guest is accessing | |
4691 | * MMIO, it is better to report an internal error. | |
4692 | * See the comments in vmx_handle_exit. | |
4693 | */ | |
4694 | if ((vect_info & VECTORING_INFO_VALID_MASK) && | |
4695 | !(is_page_fault(intr_info) && !(error_code & PFERR_RSVD_MASK))) { | |
4696 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
4697 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX; | |
4698 | vcpu->run->internal.ndata = 2; | |
4699 | vcpu->run->internal.data[0] = vect_info; | |
4700 | vcpu->run->internal.data[1] = intr_info; | |
4701 | return 0; | |
4702 | } | |
4703 | ||
4704 | if (is_page_fault(intr_info)) { | |
4705 | /* EPT won't cause page fault directly */ | |
4706 | BUG_ON(enable_ept); | |
4707 | cr2 = vmcs_readl(EXIT_QUALIFICATION); | |
4708 | trace_kvm_page_fault(cr2, error_code); | |
4709 | ||
4710 | if (kvm_event_needs_reinjection(vcpu)) | |
4711 | kvm_mmu_unprotect_page_virt(vcpu, cr2); | |
4712 | return kvm_mmu_page_fault(vcpu, cr2, error_code, NULL, 0); | |
4713 | } | |
4714 | ||
4715 | ex_no = intr_info & INTR_INFO_VECTOR_MASK; | |
4716 | ||
4717 | if (vmx->rmode.vm86_active && rmode_exception(vcpu, ex_no)) | |
4718 | return handle_rmode_exception(vcpu, ex_no, error_code); | |
4719 | ||
4720 | switch (ex_no) { | |
4721 | case DB_VECTOR: | |
4722 | dr6 = vmcs_readl(EXIT_QUALIFICATION); | |
4723 | if (!(vcpu->guest_debug & | |
4724 | (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { | |
4725 | vcpu->arch.dr6 = dr6 | DR6_FIXED_1; | |
4726 | kvm_queue_exception(vcpu, DB_VECTOR); | |
4727 | return 1; | |
4728 | } | |
4729 | kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1; | |
4730 | kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7); | |
4731 | /* fall through */ | |
4732 | case BP_VECTOR: | |
4733 | /* | |
4734 | * Update instruction length as we may reinject #BP from | |
4735 | * user space while in guest debugging mode. Reading it for | |
4736 | * #DB as well causes no harm, it is not used in that case. | |
4737 | */ | |
4738 | vmx->vcpu.arch.event_exit_inst_len = | |
4739 | vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
4740 | kvm_run->exit_reason = KVM_EXIT_DEBUG; | |
4741 | rip = kvm_rip_read(vcpu); | |
4742 | kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip; | |
4743 | kvm_run->debug.arch.exception = ex_no; | |
4744 | break; | |
4745 | default: | |
4746 | kvm_run->exit_reason = KVM_EXIT_EXCEPTION; | |
4747 | kvm_run->ex.exception = ex_no; | |
4748 | kvm_run->ex.error_code = error_code; | |
4749 | break; | |
4750 | } | |
4751 | return 0; | |
4752 | } | |
4753 | ||
4754 | static int handle_external_interrupt(struct kvm_vcpu *vcpu) | |
4755 | { | |
4756 | ++vcpu->stat.irq_exits; | |
4757 | return 1; | |
4758 | } | |
4759 | ||
4760 | static int handle_triple_fault(struct kvm_vcpu *vcpu) | |
4761 | { | |
4762 | vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; | |
4763 | return 0; | |
4764 | } | |
4765 | ||
4766 | static int handle_io(struct kvm_vcpu *vcpu) | |
4767 | { | |
4768 | unsigned long exit_qualification; | |
4769 | int size, in, string; | |
4770 | unsigned port; | |
4771 | ||
4772 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
4773 | string = (exit_qualification & 16) != 0; | |
4774 | in = (exit_qualification & 8) != 0; | |
4775 | ||
4776 | ++vcpu->stat.io_exits; | |
4777 | ||
4778 | if (string || in) | |
4779 | return emulate_instruction(vcpu, 0) == EMULATE_DONE; | |
4780 | ||
4781 | port = exit_qualification >> 16; | |
4782 | size = (exit_qualification & 7) + 1; | |
4783 | skip_emulated_instruction(vcpu); | |
4784 | ||
4785 | return kvm_fast_pio_out(vcpu, size, port); | |
4786 | } | |
4787 | ||
4788 | static void | |
4789 | vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) | |
4790 | { | |
4791 | /* | |
4792 | * Patch in the VMCALL instruction: | |
4793 | */ | |
4794 | hypercall[0] = 0x0f; | |
4795 | hypercall[1] = 0x01; | |
4796 | hypercall[2] = 0xc1; | |
4797 | } | |
4798 | ||
4799 | /* called to set cr0 as appropriate for a mov-to-cr0 exit. */ | |
4800 | static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val) | |
4801 | { | |
4802 | if (is_guest_mode(vcpu)) { | |
4803 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
4804 | unsigned long orig_val = val; | |
4805 | ||
4806 | /* | |
4807 | * We get here when L2 changed cr0 in a way that did not change | |
4808 | * any of L1's shadowed bits (see nested_vmx_exit_handled_cr), | |
4809 | * but did change L0 shadowed bits. So we first calculate the | |
4810 | * effective cr0 value that L1 would like to write into the | |
4811 | * hardware. It consists of the L2-owned bits from the new | |
4812 | * value combined with the L1-owned bits from L1's guest_cr0. | |
4813 | */ | |
4814 | val = (val & ~vmcs12->cr0_guest_host_mask) | | |
4815 | (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask); | |
4816 | ||
4817 | /* TODO: will have to take unrestricted guest mode into | |
4818 | * account */ | |
4819 | if ((val & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) | |
4820 | return 1; | |
4821 | ||
4822 | if (kvm_set_cr0(vcpu, val)) | |
4823 | return 1; | |
4824 | vmcs_writel(CR0_READ_SHADOW, orig_val); | |
4825 | return 0; | |
4826 | } else { | |
4827 | if (to_vmx(vcpu)->nested.vmxon && | |
4828 | ((val & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON)) | |
4829 | return 1; | |
4830 | return kvm_set_cr0(vcpu, val); | |
4831 | } | |
4832 | } | |
4833 | ||
4834 | static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val) | |
4835 | { | |
4836 | if (is_guest_mode(vcpu)) { | |
4837 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
4838 | unsigned long orig_val = val; | |
4839 | ||
4840 | /* analogously to handle_set_cr0 */ | |
4841 | val = (val & ~vmcs12->cr4_guest_host_mask) | | |
4842 | (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask); | |
4843 | if (kvm_set_cr4(vcpu, val)) | |
4844 | return 1; | |
4845 | vmcs_writel(CR4_READ_SHADOW, orig_val); | |
4846 | return 0; | |
4847 | } else | |
4848 | return kvm_set_cr4(vcpu, val); | |
4849 | } | |
4850 | ||
4851 | /* called to set cr0 as approriate for clts instruction exit. */ | |
4852 | static void handle_clts(struct kvm_vcpu *vcpu) | |
4853 | { | |
4854 | if (is_guest_mode(vcpu)) { | |
4855 | /* | |
4856 | * We get here when L2 did CLTS, and L1 didn't shadow CR0.TS | |
4857 | * but we did (!fpu_active). We need to keep GUEST_CR0.TS on, | |
4858 | * just pretend it's off (also in arch.cr0 for fpu_activate). | |
4859 | */ | |
4860 | vmcs_writel(CR0_READ_SHADOW, | |
4861 | vmcs_readl(CR0_READ_SHADOW) & ~X86_CR0_TS); | |
4862 | vcpu->arch.cr0 &= ~X86_CR0_TS; | |
4863 | } else | |
4864 | vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS)); | |
4865 | } | |
4866 | ||
4867 | static int handle_cr(struct kvm_vcpu *vcpu) | |
4868 | { | |
4869 | unsigned long exit_qualification, val; | |
4870 | int cr; | |
4871 | int reg; | |
4872 | int err; | |
4873 | ||
4874 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
4875 | cr = exit_qualification & 15; | |
4876 | reg = (exit_qualification >> 8) & 15; | |
4877 | switch ((exit_qualification >> 4) & 3) { | |
4878 | case 0: /* mov to cr */ | |
4879 | val = kvm_register_read(vcpu, reg); | |
4880 | trace_kvm_cr_write(cr, val); | |
4881 | switch (cr) { | |
4882 | case 0: | |
4883 | err = handle_set_cr0(vcpu, val); | |
4884 | kvm_complete_insn_gp(vcpu, err); | |
4885 | return 1; | |
4886 | case 3: | |
4887 | err = kvm_set_cr3(vcpu, val); | |
4888 | kvm_complete_insn_gp(vcpu, err); | |
4889 | return 1; | |
4890 | case 4: | |
4891 | err = handle_set_cr4(vcpu, val); | |
4892 | kvm_complete_insn_gp(vcpu, err); | |
4893 | return 1; | |
4894 | case 8: { | |
4895 | u8 cr8_prev = kvm_get_cr8(vcpu); | |
4896 | u8 cr8 = kvm_register_read(vcpu, reg); | |
4897 | err = kvm_set_cr8(vcpu, cr8); | |
4898 | kvm_complete_insn_gp(vcpu, err); | |
4899 | if (irqchip_in_kernel(vcpu->kvm)) | |
4900 | return 1; | |
4901 | if (cr8_prev <= cr8) | |
4902 | return 1; | |
4903 | vcpu->run->exit_reason = KVM_EXIT_SET_TPR; | |
4904 | return 0; | |
4905 | } | |
4906 | } | |
4907 | break; | |
4908 | case 2: /* clts */ | |
4909 | handle_clts(vcpu); | |
4910 | trace_kvm_cr_write(0, kvm_read_cr0(vcpu)); | |
4911 | skip_emulated_instruction(vcpu); | |
4912 | vmx_fpu_activate(vcpu); | |
4913 | return 1; | |
4914 | case 1: /*mov from cr*/ | |
4915 | switch (cr) { | |
4916 | case 3: | |
4917 | val = kvm_read_cr3(vcpu); | |
4918 | kvm_register_write(vcpu, reg, val); | |
4919 | trace_kvm_cr_read(cr, val); | |
4920 | skip_emulated_instruction(vcpu); | |
4921 | return 1; | |
4922 | case 8: | |
4923 | val = kvm_get_cr8(vcpu); | |
4924 | kvm_register_write(vcpu, reg, val); | |
4925 | trace_kvm_cr_read(cr, val); | |
4926 | skip_emulated_instruction(vcpu); | |
4927 | return 1; | |
4928 | } | |
4929 | break; | |
4930 | case 3: /* lmsw */ | |
4931 | val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f; | |
4932 | trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val); | |
4933 | kvm_lmsw(vcpu, val); | |
4934 | ||
4935 | skip_emulated_instruction(vcpu); | |
4936 | return 1; | |
4937 | default: | |
4938 | break; | |
4939 | } | |
4940 | vcpu->run->exit_reason = 0; | |
4941 | vcpu_unimpl(vcpu, "unhandled control register: op %d cr %d\n", | |
4942 | (int)(exit_qualification >> 4) & 3, cr); | |
4943 | return 0; | |
4944 | } | |
4945 | ||
4946 | static int handle_dr(struct kvm_vcpu *vcpu) | |
4947 | { | |
4948 | unsigned long exit_qualification; | |
4949 | int dr, reg; | |
4950 | ||
4951 | /* Do not handle if the CPL > 0, will trigger GP on re-entry */ | |
4952 | if (!kvm_require_cpl(vcpu, 0)) | |
4953 | return 1; | |
4954 | dr = vmcs_readl(GUEST_DR7); | |
4955 | if (dr & DR7_GD) { | |
4956 | /* | |
4957 | * As the vm-exit takes precedence over the debug trap, we | |
4958 | * need to emulate the latter, either for the host or the | |
4959 | * guest debugging itself. | |
4960 | */ | |
4961 | if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { | |
4962 | vcpu->run->debug.arch.dr6 = vcpu->arch.dr6; | |
4963 | vcpu->run->debug.arch.dr7 = dr; | |
4964 | vcpu->run->debug.arch.pc = | |
4965 | vmcs_readl(GUEST_CS_BASE) + | |
4966 | vmcs_readl(GUEST_RIP); | |
4967 | vcpu->run->debug.arch.exception = DB_VECTOR; | |
4968 | vcpu->run->exit_reason = KVM_EXIT_DEBUG; | |
4969 | return 0; | |
4970 | } else { | |
4971 | vcpu->arch.dr7 &= ~DR7_GD; | |
4972 | vcpu->arch.dr6 |= DR6_BD; | |
4973 | vmcs_writel(GUEST_DR7, vcpu->arch.dr7); | |
4974 | kvm_queue_exception(vcpu, DB_VECTOR); | |
4975 | return 1; | |
4976 | } | |
4977 | } | |
4978 | ||
4979 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
4980 | dr = exit_qualification & DEBUG_REG_ACCESS_NUM; | |
4981 | reg = DEBUG_REG_ACCESS_REG(exit_qualification); | |
4982 | if (exit_qualification & TYPE_MOV_FROM_DR) { | |
4983 | unsigned long val; | |
4984 | if (!kvm_get_dr(vcpu, dr, &val)) | |
4985 | kvm_register_write(vcpu, reg, val); | |
4986 | } else | |
4987 | kvm_set_dr(vcpu, dr, vcpu->arch.regs[reg]); | |
4988 | skip_emulated_instruction(vcpu); | |
4989 | return 1; | |
4990 | } | |
4991 | ||
4992 | static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val) | |
4993 | { | |
4994 | vmcs_writel(GUEST_DR7, val); | |
4995 | } | |
4996 | ||
4997 | static int handle_cpuid(struct kvm_vcpu *vcpu) | |
4998 | { | |
4999 | kvm_emulate_cpuid(vcpu); | |
5000 | return 1; | |
5001 | } | |
5002 | ||
5003 | static int handle_rdmsr(struct kvm_vcpu *vcpu) | |
5004 | { | |
5005 | u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; | |
5006 | u64 data; | |
5007 | ||
5008 | if (vmx_get_msr(vcpu, ecx, &data)) { | |
5009 | trace_kvm_msr_read_ex(ecx); | |
5010 | kvm_inject_gp(vcpu, 0); | |
5011 | return 1; | |
5012 | } | |
5013 | ||
5014 | trace_kvm_msr_read(ecx, data); | |
5015 | ||
5016 | /* FIXME: handling of bits 32:63 of rax, rdx */ | |
5017 | vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u; | |
5018 | vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u; | |
5019 | skip_emulated_instruction(vcpu); | |
5020 | return 1; | |
5021 | } | |
5022 | ||
5023 | static int handle_wrmsr(struct kvm_vcpu *vcpu) | |
5024 | { | |
5025 | struct msr_data msr; | |
5026 | u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; | |
5027 | u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) | |
5028 | | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); | |
5029 | ||
5030 | msr.data = data; | |
5031 | msr.index = ecx; | |
5032 | msr.host_initiated = false; | |
5033 | if (vmx_set_msr(vcpu, &msr) != 0) { | |
5034 | trace_kvm_msr_write_ex(ecx, data); | |
5035 | kvm_inject_gp(vcpu, 0); | |
5036 | return 1; | |
5037 | } | |
5038 | ||
5039 | trace_kvm_msr_write(ecx, data); | |
5040 | skip_emulated_instruction(vcpu); | |
5041 | return 1; | |
5042 | } | |
5043 | ||
5044 | static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu) | |
5045 | { | |
5046 | kvm_make_request(KVM_REQ_EVENT, vcpu); | |
5047 | return 1; | |
5048 | } | |
5049 | ||
5050 | static int handle_interrupt_window(struct kvm_vcpu *vcpu) | |
5051 | { | |
5052 | u32 cpu_based_vm_exec_control; | |
5053 | ||
5054 | /* clear pending irq */ | |
5055 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
5056 | cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; | |
5057 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
5058 | ||
5059 | kvm_make_request(KVM_REQ_EVENT, vcpu); | |
5060 | ||
5061 | ++vcpu->stat.irq_window_exits; | |
5062 | ||
5063 | /* | |
5064 | * If the user space waits to inject interrupts, exit as soon as | |
5065 | * possible | |
5066 | */ | |
5067 | if (!irqchip_in_kernel(vcpu->kvm) && | |
5068 | vcpu->run->request_interrupt_window && | |
5069 | !kvm_cpu_has_interrupt(vcpu)) { | |
5070 | vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; | |
5071 | return 0; | |
5072 | } | |
5073 | return 1; | |
5074 | } | |
5075 | ||
5076 | static int handle_halt(struct kvm_vcpu *vcpu) | |
5077 | { | |
5078 | skip_emulated_instruction(vcpu); | |
5079 | return kvm_emulate_halt(vcpu); | |
5080 | } | |
5081 | ||
5082 | static int handle_vmcall(struct kvm_vcpu *vcpu) | |
5083 | { | |
5084 | skip_emulated_instruction(vcpu); | |
5085 | kvm_emulate_hypercall(vcpu); | |
5086 | return 1; | |
5087 | } | |
5088 | ||
5089 | static int handle_invd(struct kvm_vcpu *vcpu) | |
5090 | { | |
5091 | return emulate_instruction(vcpu, 0) == EMULATE_DONE; | |
5092 | } | |
5093 | ||
5094 | static int handle_invlpg(struct kvm_vcpu *vcpu) | |
5095 | { | |
5096 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
5097 | ||
5098 | kvm_mmu_invlpg(vcpu, exit_qualification); | |
5099 | skip_emulated_instruction(vcpu); | |
5100 | return 1; | |
5101 | } | |
5102 | ||
5103 | static int handle_rdpmc(struct kvm_vcpu *vcpu) | |
5104 | { | |
5105 | int err; | |
5106 | ||
5107 | err = kvm_rdpmc(vcpu); | |
5108 | kvm_complete_insn_gp(vcpu, err); | |
5109 | ||
5110 | return 1; | |
5111 | } | |
5112 | ||
5113 | static int handle_wbinvd(struct kvm_vcpu *vcpu) | |
5114 | { | |
5115 | skip_emulated_instruction(vcpu); | |
5116 | kvm_emulate_wbinvd(vcpu); | |
5117 | return 1; | |
5118 | } | |
5119 | ||
5120 | static int handle_xsetbv(struct kvm_vcpu *vcpu) | |
5121 | { | |
5122 | u64 new_bv = kvm_read_edx_eax(vcpu); | |
5123 | u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX); | |
5124 | ||
5125 | if (kvm_set_xcr(vcpu, index, new_bv) == 0) | |
5126 | skip_emulated_instruction(vcpu); | |
5127 | return 1; | |
5128 | } | |
5129 | ||
5130 | static int handle_apic_access(struct kvm_vcpu *vcpu) | |
5131 | { | |
5132 | if (likely(fasteoi)) { | |
5133 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
5134 | int access_type, offset; | |
5135 | ||
5136 | access_type = exit_qualification & APIC_ACCESS_TYPE; | |
5137 | offset = exit_qualification & APIC_ACCESS_OFFSET; | |
5138 | /* | |
5139 | * Sane guest uses MOV to write EOI, with written value | |
5140 | * not cared. So make a short-circuit here by avoiding | |
5141 | * heavy instruction emulation. | |
5142 | */ | |
5143 | if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) && | |
5144 | (offset == APIC_EOI)) { | |
5145 | kvm_lapic_set_eoi(vcpu); | |
5146 | skip_emulated_instruction(vcpu); | |
5147 | return 1; | |
5148 | } | |
5149 | } | |
5150 | return emulate_instruction(vcpu, 0) == EMULATE_DONE; | |
5151 | } | |
5152 | ||
5153 | static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu) | |
5154 | { | |
5155 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
5156 | int vector = exit_qualification & 0xff; | |
5157 | ||
5158 | /* EOI-induced VM exit is trap-like and thus no need to adjust IP */ | |
5159 | kvm_apic_set_eoi_accelerated(vcpu, vector); | |
5160 | return 1; | |
5161 | } | |
5162 | ||
5163 | static int handle_apic_write(struct kvm_vcpu *vcpu) | |
5164 | { | |
5165 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
5166 | u32 offset = exit_qualification & 0xfff; | |
5167 | ||
5168 | /* APIC-write VM exit is trap-like and thus no need to adjust IP */ | |
5169 | kvm_apic_write_nodecode(vcpu, offset); | |
5170 | return 1; | |
5171 | } | |
5172 | ||
5173 | static int handle_task_switch(struct kvm_vcpu *vcpu) | |
5174 | { | |
5175 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
5176 | unsigned long exit_qualification; | |
5177 | bool has_error_code = false; | |
5178 | u32 error_code = 0; | |
5179 | u16 tss_selector; | |
5180 | int reason, type, idt_v, idt_index; | |
5181 | ||
5182 | idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); | |
5183 | idt_index = (vmx->idt_vectoring_info & VECTORING_INFO_VECTOR_MASK); | |
5184 | type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); | |
5185 | ||
5186 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
5187 | ||
5188 | reason = (u32)exit_qualification >> 30; | |
5189 | if (reason == TASK_SWITCH_GATE && idt_v) { | |
5190 | switch (type) { | |
5191 | case INTR_TYPE_NMI_INTR: | |
5192 | vcpu->arch.nmi_injected = false; | |
5193 | vmx_set_nmi_mask(vcpu, true); | |
5194 | break; | |
5195 | case INTR_TYPE_EXT_INTR: | |
5196 | case INTR_TYPE_SOFT_INTR: | |
5197 | kvm_clear_interrupt_queue(vcpu); | |
5198 | break; | |
5199 | case INTR_TYPE_HARD_EXCEPTION: | |
5200 | if (vmx->idt_vectoring_info & | |
5201 | VECTORING_INFO_DELIVER_CODE_MASK) { | |
5202 | has_error_code = true; | |
5203 | error_code = | |
5204 | vmcs_read32(IDT_VECTORING_ERROR_CODE); | |
5205 | } | |
5206 | /* fall through */ | |
5207 | case INTR_TYPE_SOFT_EXCEPTION: | |
5208 | kvm_clear_exception_queue(vcpu); | |
5209 | break; | |
5210 | default: | |
5211 | break; | |
5212 | } | |
5213 | } | |
5214 | tss_selector = exit_qualification; | |
5215 | ||
5216 | if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && | |
5217 | type != INTR_TYPE_EXT_INTR && | |
5218 | type != INTR_TYPE_NMI_INTR)) | |
5219 | skip_emulated_instruction(vcpu); | |
5220 | ||
5221 | if (kvm_task_switch(vcpu, tss_selector, | |
5222 | type == INTR_TYPE_SOFT_INTR ? idt_index : -1, reason, | |
5223 | has_error_code, error_code) == EMULATE_FAIL) { | |
5224 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
5225 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; | |
5226 | vcpu->run->internal.ndata = 0; | |
5227 | return 0; | |
5228 | } | |
5229 | ||
5230 | /* clear all local breakpoint enable flags */ | |
5231 | vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55); | |
5232 | ||
5233 | /* | |
5234 | * TODO: What about debug traps on tss switch? | |
5235 | * Are we supposed to inject them and update dr6? | |
5236 | */ | |
5237 | ||
5238 | return 1; | |
5239 | } | |
5240 | ||
5241 | static int handle_ept_violation(struct kvm_vcpu *vcpu) | |
5242 | { | |
5243 | unsigned long exit_qualification; | |
5244 | gpa_t gpa; | |
5245 | u32 error_code; | |
5246 | int gla_validity; | |
5247 | ||
5248 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
5249 | ||
5250 | gla_validity = (exit_qualification >> 7) & 0x3; | |
5251 | if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) { | |
5252 | printk(KERN_ERR "EPT: Handling EPT violation failed!\n"); | |
5253 | printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n", | |
5254 | (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS), | |
5255 | vmcs_readl(GUEST_LINEAR_ADDRESS)); | |
5256 | printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n", | |
5257 | (long unsigned int)exit_qualification); | |
5258 | vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; | |
5259 | vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION; | |
5260 | return 0; | |
5261 | } | |
5262 | ||
5263 | gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); | |
5264 | trace_kvm_page_fault(gpa, exit_qualification); | |
5265 | ||
5266 | /* It is a write fault? */ | |
5267 | error_code = exit_qualification & (1U << 1); | |
5268 | /* ept page table is present? */ | |
5269 | error_code |= (exit_qualification >> 3) & 0x1; | |
5270 | ||
5271 | return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0); | |
5272 | } | |
5273 | ||
5274 | static u64 ept_rsvd_mask(u64 spte, int level) | |
5275 | { | |
5276 | int i; | |
5277 | u64 mask = 0; | |
5278 | ||
5279 | for (i = 51; i > boot_cpu_data.x86_phys_bits; i--) | |
5280 | mask |= (1ULL << i); | |
5281 | ||
5282 | if (level > 2) | |
5283 | /* bits 7:3 reserved */ | |
5284 | mask |= 0xf8; | |
5285 | else if (level == 2) { | |
5286 | if (spte & (1ULL << 7)) | |
5287 | /* 2MB ref, bits 20:12 reserved */ | |
5288 | mask |= 0x1ff000; | |
5289 | else | |
5290 | /* bits 6:3 reserved */ | |
5291 | mask |= 0x78; | |
5292 | } | |
5293 | ||
5294 | return mask; | |
5295 | } | |
5296 | ||
5297 | static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte, | |
5298 | int level) | |
5299 | { | |
5300 | printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level); | |
5301 | ||
5302 | /* 010b (write-only) */ | |
5303 | WARN_ON((spte & 0x7) == 0x2); | |
5304 | ||
5305 | /* 110b (write/execute) */ | |
5306 | WARN_ON((spte & 0x7) == 0x6); | |
5307 | ||
5308 | /* 100b (execute-only) and value not supported by logical processor */ | |
5309 | if (!cpu_has_vmx_ept_execute_only()) | |
5310 | WARN_ON((spte & 0x7) == 0x4); | |
5311 | ||
5312 | /* not 000b */ | |
5313 | if ((spte & 0x7)) { | |
5314 | u64 rsvd_bits = spte & ept_rsvd_mask(spte, level); | |
5315 | ||
5316 | if (rsvd_bits != 0) { | |
5317 | printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n", | |
5318 | __func__, rsvd_bits); | |
5319 | WARN_ON(1); | |
5320 | } | |
5321 | ||
5322 | if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) { | |
5323 | u64 ept_mem_type = (spte & 0x38) >> 3; | |
5324 | ||
5325 | if (ept_mem_type == 2 || ept_mem_type == 3 || | |
5326 | ept_mem_type == 7) { | |
5327 | printk(KERN_ERR "%s: ept_mem_type=0x%llx\n", | |
5328 | __func__, ept_mem_type); | |
5329 | WARN_ON(1); | |
5330 | } | |
5331 | } | |
5332 | } | |
5333 | } | |
5334 | ||
5335 | static int handle_ept_misconfig(struct kvm_vcpu *vcpu) | |
5336 | { | |
5337 | u64 sptes[4]; | |
5338 | int nr_sptes, i, ret; | |
5339 | gpa_t gpa; | |
5340 | ||
5341 | gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); | |
5342 | ||
5343 | ret = handle_mmio_page_fault_common(vcpu, gpa, true); | |
5344 | if (likely(ret == 1)) | |
5345 | return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) == | |
5346 | EMULATE_DONE; | |
5347 | if (unlikely(!ret)) | |
5348 | return 1; | |
5349 | ||
5350 | /* It is the real ept misconfig */ | |
5351 | printk(KERN_ERR "EPT: Misconfiguration.\n"); | |
5352 | printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa); | |
5353 | ||
5354 | nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes); | |
5355 | ||
5356 | for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i) | |
5357 | ept_misconfig_inspect_spte(vcpu, sptes[i-1], i); | |
5358 | ||
5359 | vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; | |
5360 | vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG; | |
5361 | ||
5362 | return 0; | |
5363 | } | |
5364 | ||
5365 | static int handle_nmi_window(struct kvm_vcpu *vcpu) | |
5366 | { | |
5367 | u32 cpu_based_vm_exec_control; | |
5368 | ||
5369 | /* clear pending NMI */ | |
5370 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
5371 | cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; | |
5372 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
5373 | ++vcpu->stat.nmi_window_exits; | |
5374 | kvm_make_request(KVM_REQ_EVENT, vcpu); | |
5375 | ||
5376 | return 1; | |
5377 | } | |
5378 | ||
5379 | static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) | |
5380 | { | |
5381 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
5382 | enum emulation_result err = EMULATE_DONE; | |
5383 | int ret = 1; | |
5384 | u32 cpu_exec_ctrl; | |
5385 | bool intr_window_requested; | |
5386 | unsigned count = 130; | |
5387 | ||
5388 | cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
5389 | intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING; | |
5390 | ||
5391 | while (!guest_state_valid(vcpu) && count-- != 0) { | |
5392 | if (intr_window_requested && vmx_interrupt_allowed(vcpu)) | |
5393 | return handle_interrupt_window(&vmx->vcpu); | |
5394 | ||
5395 | if (test_bit(KVM_REQ_EVENT, &vcpu->requests)) | |
5396 | return 1; | |
5397 | ||
5398 | err = emulate_instruction(vcpu, EMULTYPE_NO_REEXECUTE); | |
5399 | ||
5400 | if (err == EMULATE_DO_MMIO) { | |
5401 | ret = 0; | |
5402 | goto out; | |
5403 | } | |
5404 | ||
5405 | if (err != EMULATE_DONE) { | |
5406 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
5407 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; | |
5408 | vcpu->run->internal.ndata = 0; | |
5409 | return 0; | |
5410 | } | |
5411 | ||
5412 | if (signal_pending(current)) | |
5413 | goto out; | |
5414 | if (need_resched()) | |
5415 | schedule(); | |
5416 | } | |
5417 | ||
5418 | vmx->emulation_required = emulation_required(vcpu); | |
5419 | out: | |
5420 | return ret; | |
5421 | } | |
5422 | ||
5423 | /* | |
5424 | * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE | |
5425 | * exiting, so only get here on cpu with PAUSE-Loop-Exiting. | |
5426 | */ | |
5427 | static int handle_pause(struct kvm_vcpu *vcpu) | |
5428 | { | |
5429 | skip_emulated_instruction(vcpu); | |
5430 | kvm_vcpu_on_spin(vcpu); | |
5431 | ||
5432 | return 1; | |
5433 | } | |
5434 | ||
5435 | static int handle_invalid_op(struct kvm_vcpu *vcpu) | |
5436 | { | |
5437 | kvm_queue_exception(vcpu, UD_VECTOR); | |
5438 | return 1; | |
5439 | } | |
5440 | ||
5441 | /* | |
5442 | * To run an L2 guest, we need a vmcs02 based on the L1-specified vmcs12. | |
5443 | * We could reuse a single VMCS for all the L2 guests, but we also want the | |
5444 | * option to allocate a separate vmcs02 for each separate loaded vmcs12 - this | |
5445 | * allows keeping them loaded on the processor, and in the future will allow | |
5446 | * optimizations where prepare_vmcs02 doesn't need to set all the fields on | |
5447 | * every entry if they never change. | |
5448 | * So we keep, in vmx->nested.vmcs02_pool, a cache of size VMCS02_POOL_SIZE | |
5449 | * (>=0) with a vmcs02 for each recently loaded vmcs12s, most recent first. | |
5450 | * | |
5451 | * The following functions allocate and free a vmcs02 in this pool. | |
5452 | */ | |
5453 | ||
5454 | /* Get a VMCS from the pool to use as vmcs02 for the current vmcs12. */ | |
5455 | static struct loaded_vmcs *nested_get_current_vmcs02(struct vcpu_vmx *vmx) | |
5456 | { | |
5457 | struct vmcs02_list *item; | |
5458 | list_for_each_entry(item, &vmx->nested.vmcs02_pool, list) | |
5459 | if (item->vmptr == vmx->nested.current_vmptr) { | |
5460 | list_move(&item->list, &vmx->nested.vmcs02_pool); | |
5461 | return &item->vmcs02; | |
5462 | } | |
5463 | ||
5464 | if (vmx->nested.vmcs02_num >= max(VMCS02_POOL_SIZE, 1)) { | |
5465 | /* Recycle the least recently used VMCS. */ | |
5466 | item = list_entry(vmx->nested.vmcs02_pool.prev, | |
5467 | struct vmcs02_list, list); | |
5468 | item->vmptr = vmx->nested.current_vmptr; | |
5469 | list_move(&item->list, &vmx->nested.vmcs02_pool); | |
5470 | return &item->vmcs02; | |
5471 | } | |
5472 | ||
5473 | /* Create a new VMCS */ | |
5474 | item = kmalloc(sizeof(struct vmcs02_list), GFP_KERNEL); | |
5475 | if (!item) | |
5476 | return NULL; | |
5477 | item->vmcs02.vmcs = alloc_vmcs(); | |
5478 | if (!item->vmcs02.vmcs) { | |
5479 | kfree(item); | |
5480 | return NULL; | |
5481 | } | |
5482 | loaded_vmcs_init(&item->vmcs02); | |
5483 | item->vmptr = vmx->nested.current_vmptr; | |
5484 | list_add(&(item->list), &(vmx->nested.vmcs02_pool)); | |
5485 | vmx->nested.vmcs02_num++; | |
5486 | return &item->vmcs02; | |
5487 | } | |
5488 | ||
5489 | /* Free and remove from pool a vmcs02 saved for a vmcs12 (if there is one) */ | |
5490 | static void nested_free_vmcs02(struct vcpu_vmx *vmx, gpa_t vmptr) | |
5491 | { | |
5492 | struct vmcs02_list *item; | |
5493 | list_for_each_entry(item, &vmx->nested.vmcs02_pool, list) | |
5494 | if (item->vmptr == vmptr) { | |
5495 | free_loaded_vmcs(&item->vmcs02); | |
5496 | list_del(&item->list); | |
5497 | kfree(item); | |
5498 | vmx->nested.vmcs02_num--; | |
5499 | return; | |
5500 | } | |
5501 | } | |
5502 | ||
5503 | /* | |
5504 | * Free all VMCSs saved for this vcpu, except the one pointed by | |
5505 | * vmx->loaded_vmcs. These include the VMCSs in vmcs02_pool (except the one | |
5506 | * currently used, if running L2), and vmcs01 when running L2. | |
5507 | */ | |
5508 | static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx) | |
5509 | { | |
5510 | struct vmcs02_list *item, *n; | |
5511 | list_for_each_entry_safe(item, n, &vmx->nested.vmcs02_pool, list) { | |
5512 | if (vmx->loaded_vmcs != &item->vmcs02) | |
5513 | free_loaded_vmcs(&item->vmcs02); | |
5514 | list_del(&item->list); | |
5515 | kfree(item); | |
5516 | } | |
5517 | vmx->nested.vmcs02_num = 0; | |
5518 | ||
5519 | if (vmx->loaded_vmcs != &vmx->vmcs01) | |
5520 | free_loaded_vmcs(&vmx->vmcs01); | |
5521 | } | |
5522 | ||
5523 | static void nested_vmx_failValid(struct kvm_vcpu *vcpu, | |
5524 | u32 vm_instruction_error); | |
5525 | ||
5526 | /* | |
5527 | * Emulate the VMXON instruction. | |
5528 | * Currently, we just remember that VMX is active, and do not save or even | |
5529 | * inspect the argument to VMXON (the so-called "VMXON pointer") because we | |
5530 | * do not currently need to store anything in that guest-allocated memory | |
5531 | * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their | |
5532 | * argument is different from the VMXON pointer (which the spec says they do). | |
5533 | */ | |
5534 | static int handle_vmon(struct kvm_vcpu *vcpu) | |
5535 | { | |
5536 | struct kvm_segment cs; | |
5537 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
5538 | struct vmcs *shadow_vmcs; | |
5539 | ||
5540 | /* The Intel VMX Instruction Reference lists a bunch of bits that | |
5541 | * are prerequisite to running VMXON, most notably cr4.VMXE must be | |
5542 | * set to 1 (see vmx_set_cr4() for when we allow the guest to set this). | |
5543 | * Otherwise, we should fail with #UD. We test these now: | |
5544 | */ | |
5545 | if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE) || | |
5546 | !kvm_read_cr0_bits(vcpu, X86_CR0_PE) || | |
5547 | (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) { | |
5548 | kvm_queue_exception(vcpu, UD_VECTOR); | |
5549 | return 1; | |
5550 | } | |
5551 | ||
5552 | vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); | |
5553 | if (is_long_mode(vcpu) && !cs.l) { | |
5554 | kvm_queue_exception(vcpu, UD_VECTOR); | |
5555 | return 1; | |
5556 | } | |
5557 | ||
5558 | if (vmx_get_cpl(vcpu)) { | |
5559 | kvm_inject_gp(vcpu, 0); | |
5560 | return 1; | |
5561 | } | |
5562 | if (vmx->nested.vmxon) { | |
5563 | nested_vmx_failValid(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION); | |
5564 | skip_emulated_instruction(vcpu); | |
5565 | return 1; | |
5566 | } | |
5567 | if (enable_shadow_vmcs) { | |
5568 | shadow_vmcs = alloc_vmcs(); | |
5569 | if (!shadow_vmcs) | |
5570 | return -ENOMEM; | |
5571 | /* mark vmcs as shadow */ | |
5572 | shadow_vmcs->revision_id |= (1u << 31); | |
5573 | /* init shadow vmcs */ | |
5574 | vmcs_clear(shadow_vmcs); | |
5575 | vmx->nested.current_shadow_vmcs = shadow_vmcs; | |
5576 | } | |
5577 | ||
5578 | INIT_LIST_HEAD(&(vmx->nested.vmcs02_pool)); | |
5579 | vmx->nested.vmcs02_num = 0; | |
5580 | ||
5581 | vmx->nested.vmxon = true; | |
5582 | ||
5583 | skip_emulated_instruction(vcpu); | |
5584 | return 1; | |
5585 | } | |
5586 | ||
5587 | /* | |
5588 | * Intel's VMX Instruction Reference specifies a common set of prerequisites | |
5589 | * for running VMX instructions (except VMXON, whose prerequisites are | |
5590 | * slightly different). It also specifies what exception to inject otherwise. | |
5591 | */ | |
5592 | static int nested_vmx_check_permission(struct kvm_vcpu *vcpu) | |
5593 | { | |
5594 | struct kvm_segment cs; | |
5595 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
5596 | ||
5597 | if (!vmx->nested.vmxon) { | |
5598 | kvm_queue_exception(vcpu, UD_VECTOR); | |
5599 | return 0; | |
5600 | } | |
5601 | ||
5602 | vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); | |
5603 | if ((vmx_get_rflags(vcpu) & X86_EFLAGS_VM) || | |
5604 | (is_long_mode(vcpu) && !cs.l)) { | |
5605 | kvm_queue_exception(vcpu, UD_VECTOR); | |
5606 | return 0; | |
5607 | } | |
5608 | ||
5609 | if (vmx_get_cpl(vcpu)) { | |
5610 | kvm_inject_gp(vcpu, 0); | |
5611 | return 0; | |
5612 | } | |
5613 | ||
5614 | return 1; | |
5615 | } | |
5616 | ||
5617 | static inline void nested_release_vmcs12(struct vcpu_vmx *vmx) | |
5618 | { | |
5619 | u32 exec_control; | |
5620 | if (enable_shadow_vmcs) { | |
5621 | if (vmx->nested.current_vmcs12 != NULL) { | |
5622 | /* copy to memory all shadowed fields in case | |
5623 | they were modified */ | |
5624 | copy_shadow_to_vmcs12(vmx); | |
5625 | vmx->nested.sync_shadow_vmcs = false; | |
5626 | exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); | |
5627 | exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS; | |
5628 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); | |
5629 | vmcs_write64(VMCS_LINK_POINTER, -1ull); | |
5630 | } | |
5631 | } | |
5632 | kunmap(vmx->nested.current_vmcs12_page); | |
5633 | nested_release_page(vmx->nested.current_vmcs12_page); | |
5634 | } | |
5635 | ||
5636 | /* | |
5637 | * Free whatever needs to be freed from vmx->nested when L1 goes down, or | |
5638 | * just stops using VMX. | |
5639 | */ | |
5640 | static void free_nested(struct vcpu_vmx *vmx) | |
5641 | { | |
5642 | if (!vmx->nested.vmxon) | |
5643 | return; | |
5644 | vmx->nested.vmxon = false; | |
5645 | if (vmx->nested.current_vmptr != -1ull) { | |
5646 | nested_release_vmcs12(vmx); | |
5647 | vmx->nested.current_vmptr = -1ull; | |
5648 | vmx->nested.current_vmcs12 = NULL; | |
5649 | } | |
5650 | if (enable_shadow_vmcs) | |
5651 | free_vmcs(vmx->nested.current_shadow_vmcs); | |
5652 | /* Unpin physical memory we referred to in current vmcs02 */ | |
5653 | if (vmx->nested.apic_access_page) { | |
5654 | nested_release_page(vmx->nested.apic_access_page); | |
5655 | vmx->nested.apic_access_page = 0; | |
5656 | } | |
5657 | ||
5658 | nested_free_all_saved_vmcss(vmx); | |
5659 | } | |
5660 | ||
5661 | /* Emulate the VMXOFF instruction */ | |
5662 | static int handle_vmoff(struct kvm_vcpu *vcpu) | |
5663 | { | |
5664 | if (!nested_vmx_check_permission(vcpu)) | |
5665 | return 1; | |
5666 | free_nested(to_vmx(vcpu)); | |
5667 | skip_emulated_instruction(vcpu); | |
5668 | return 1; | |
5669 | } | |
5670 | ||
5671 | /* | |
5672 | * Decode the memory-address operand of a vmx instruction, as recorded on an | |
5673 | * exit caused by such an instruction (run by a guest hypervisor). | |
5674 | * On success, returns 0. When the operand is invalid, returns 1 and throws | |
5675 | * #UD or #GP. | |
5676 | */ | |
5677 | static int get_vmx_mem_address(struct kvm_vcpu *vcpu, | |
5678 | unsigned long exit_qualification, | |
5679 | u32 vmx_instruction_info, gva_t *ret) | |
5680 | { | |
5681 | /* | |
5682 | * According to Vol. 3B, "Information for VM Exits Due to Instruction | |
5683 | * Execution", on an exit, vmx_instruction_info holds most of the | |
5684 | * addressing components of the operand. Only the displacement part | |
5685 | * is put in exit_qualification (see 3B, "Basic VM-Exit Information"). | |
5686 | * For how an actual address is calculated from all these components, | |
5687 | * refer to Vol. 1, "Operand Addressing". | |
5688 | */ | |
5689 | int scaling = vmx_instruction_info & 3; | |
5690 | int addr_size = (vmx_instruction_info >> 7) & 7; | |
5691 | bool is_reg = vmx_instruction_info & (1u << 10); | |
5692 | int seg_reg = (vmx_instruction_info >> 15) & 7; | |
5693 | int index_reg = (vmx_instruction_info >> 18) & 0xf; | |
5694 | bool index_is_valid = !(vmx_instruction_info & (1u << 22)); | |
5695 | int base_reg = (vmx_instruction_info >> 23) & 0xf; | |
5696 | bool base_is_valid = !(vmx_instruction_info & (1u << 27)); | |
5697 | ||
5698 | if (is_reg) { | |
5699 | kvm_queue_exception(vcpu, UD_VECTOR); | |
5700 | return 1; | |
5701 | } | |
5702 | ||
5703 | /* Addr = segment_base + offset */ | |
5704 | /* offset = base + [index * scale] + displacement */ | |
5705 | *ret = vmx_get_segment_base(vcpu, seg_reg); | |
5706 | if (base_is_valid) | |
5707 | *ret += kvm_register_read(vcpu, base_reg); | |
5708 | if (index_is_valid) | |
5709 | *ret += kvm_register_read(vcpu, index_reg)<<scaling; | |
5710 | *ret += exit_qualification; /* holds the displacement */ | |
5711 | ||
5712 | if (addr_size == 1) /* 32 bit */ | |
5713 | *ret &= 0xffffffff; | |
5714 | ||
5715 | /* | |
5716 | * TODO: throw #GP (and return 1) in various cases that the VM* | |
5717 | * instructions require it - e.g., offset beyond segment limit, | |
5718 | * unusable or unreadable/unwritable segment, non-canonical 64-bit | |
5719 | * address, and so on. Currently these are not checked. | |
5720 | */ | |
5721 | return 0; | |
5722 | } | |
5723 | ||
5724 | /* | |
5725 | * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(), | |
5726 | * set the success or error code of an emulated VMX instruction, as specified | |
5727 | * by Vol 2B, VMX Instruction Reference, "Conventions". | |
5728 | */ | |
5729 | static void nested_vmx_succeed(struct kvm_vcpu *vcpu) | |
5730 | { | |
5731 | vmx_set_rflags(vcpu, vmx_get_rflags(vcpu) | |
5732 | & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | | |
5733 | X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF)); | |
5734 | } | |
5735 | ||
5736 | static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu) | |
5737 | { | |
5738 | vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu) | |
5739 | & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF | | |
5740 | X86_EFLAGS_SF | X86_EFLAGS_OF)) | |
5741 | | X86_EFLAGS_CF); | |
5742 | } | |
5743 | ||
5744 | static void nested_vmx_failValid(struct kvm_vcpu *vcpu, | |
5745 | u32 vm_instruction_error) | |
5746 | { | |
5747 | if (to_vmx(vcpu)->nested.current_vmptr == -1ull) { | |
5748 | /* | |
5749 | * failValid writes the error number to the current VMCS, which | |
5750 | * can't be done there isn't a current VMCS. | |
5751 | */ | |
5752 | nested_vmx_failInvalid(vcpu); | |
5753 | return; | |
5754 | } | |
5755 | vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu) | |
5756 | & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF | | |
5757 | X86_EFLAGS_SF | X86_EFLAGS_OF)) | |
5758 | | X86_EFLAGS_ZF); | |
5759 | get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error; | |
5760 | /* | |
5761 | * We don't need to force a shadow sync because | |
5762 | * VM_INSTRUCTION_ERROR is not shadowed | |
5763 | */ | |
5764 | } | |
5765 | ||
5766 | /* Emulate the VMCLEAR instruction */ | |
5767 | static int handle_vmclear(struct kvm_vcpu *vcpu) | |
5768 | { | |
5769 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
5770 | gva_t gva; | |
5771 | gpa_t vmptr; | |
5772 | struct vmcs12 *vmcs12; | |
5773 | struct page *page; | |
5774 | struct x86_exception e; | |
5775 | ||
5776 | if (!nested_vmx_check_permission(vcpu)) | |
5777 | return 1; | |
5778 | ||
5779 | if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), | |
5780 | vmcs_read32(VMX_INSTRUCTION_INFO), &gva)) | |
5781 | return 1; | |
5782 | ||
5783 | if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr, | |
5784 | sizeof(vmptr), &e)) { | |
5785 | kvm_inject_page_fault(vcpu, &e); | |
5786 | return 1; | |
5787 | } | |
5788 | ||
5789 | if (!IS_ALIGNED(vmptr, PAGE_SIZE)) { | |
5790 | nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS); | |
5791 | skip_emulated_instruction(vcpu); | |
5792 | return 1; | |
5793 | } | |
5794 | ||
5795 | if (vmptr == vmx->nested.current_vmptr) { | |
5796 | nested_release_vmcs12(vmx); | |
5797 | vmx->nested.current_vmptr = -1ull; | |
5798 | vmx->nested.current_vmcs12 = NULL; | |
5799 | } | |
5800 | ||
5801 | page = nested_get_page(vcpu, vmptr); | |
5802 | if (page == NULL) { | |
5803 | /* | |
5804 | * For accurate processor emulation, VMCLEAR beyond available | |
5805 | * physical memory should do nothing at all. However, it is | |
5806 | * possible that a nested vmx bug, not a guest hypervisor bug, | |
5807 | * resulted in this case, so let's shut down before doing any | |
5808 | * more damage: | |
5809 | */ | |
5810 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); | |
5811 | return 1; | |
5812 | } | |
5813 | vmcs12 = kmap(page); | |
5814 | vmcs12->launch_state = 0; | |
5815 | kunmap(page); | |
5816 | nested_release_page(page); | |
5817 | ||
5818 | nested_free_vmcs02(vmx, vmptr); | |
5819 | ||
5820 | skip_emulated_instruction(vcpu); | |
5821 | nested_vmx_succeed(vcpu); | |
5822 | return 1; | |
5823 | } | |
5824 | ||
5825 | static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch); | |
5826 | ||
5827 | /* Emulate the VMLAUNCH instruction */ | |
5828 | static int handle_vmlaunch(struct kvm_vcpu *vcpu) | |
5829 | { | |
5830 | return nested_vmx_run(vcpu, true); | |
5831 | } | |
5832 | ||
5833 | /* Emulate the VMRESUME instruction */ | |
5834 | static int handle_vmresume(struct kvm_vcpu *vcpu) | |
5835 | { | |
5836 | ||
5837 | return nested_vmx_run(vcpu, false); | |
5838 | } | |
5839 | ||
5840 | enum vmcs_field_type { | |
5841 | VMCS_FIELD_TYPE_U16 = 0, | |
5842 | VMCS_FIELD_TYPE_U64 = 1, | |
5843 | VMCS_FIELD_TYPE_U32 = 2, | |
5844 | VMCS_FIELD_TYPE_NATURAL_WIDTH = 3 | |
5845 | }; | |
5846 | ||
5847 | static inline int vmcs_field_type(unsigned long field) | |
5848 | { | |
5849 | if (0x1 & field) /* the *_HIGH fields are all 32 bit */ | |
5850 | return VMCS_FIELD_TYPE_U32; | |
5851 | return (field >> 13) & 0x3 ; | |
5852 | } | |
5853 | ||
5854 | static inline int vmcs_field_readonly(unsigned long field) | |
5855 | { | |
5856 | return (((field >> 10) & 0x3) == 1); | |
5857 | } | |
5858 | ||
5859 | /* | |
5860 | * Read a vmcs12 field. Since these can have varying lengths and we return | |
5861 | * one type, we chose the biggest type (u64) and zero-extend the return value | |
5862 | * to that size. Note that the caller, handle_vmread, might need to use only | |
5863 | * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of | |
5864 | * 64-bit fields are to be returned). | |
5865 | */ | |
5866 | static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu, | |
5867 | unsigned long field, u64 *ret) | |
5868 | { | |
5869 | short offset = vmcs_field_to_offset(field); | |
5870 | char *p; | |
5871 | ||
5872 | if (offset < 0) | |
5873 | return 0; | |
5874 | ||
5875 | p = ((char *)(get_vmcs12(vcpu))) + offset; | |
5876 | ||
5877 | switch (vmcs_field_type(field)) { | |
5878 | case VMCS_FIELD_TYPE_NATURAL_WIDTH: | |
5879 | *ret = *((natural_width *)p); | |
5880 | return 1; | |
5881 | case VMCS_FIELD_TYPE_U16: | |
5882 | *ret = *((u16 *)p); | |
5883 | return 1; | |
5884 | case VMCS_FIELD_TYPE_U32: | |
5885 | *ret = *((u32 *)p); | |
5886 | return 1; | |
5887 | case VMCS_FIELD_TYPE_U64: | |
5888 | *ret = *((u64 *)p); | |
5889 | return 1; | |
5890 | default: | |
5891 | return 0; /* can never happen. */ | |
5892 | } | |
5893 | } | |
5894 | ||
5895 | ||
5896 | static inline bool vmcs12_write_any(struct kvm_vcpu *vcpu, | |
5897 | unsigned long field, u64 field_value){ | |
5898 | short offset = vmcs_field_to_offset(field); | |
5899 | char *p = ((char *) get_vmcs12(vcpu)) + offset; | |
5900 | if (offset < 0) | |
5901 | return false; | |
5902 | ||
5903 | switch (vmcs_field_type(field)) { | |
5904 | case VMCS_FIELD_TYPE_U16: | |
5905 | *(u16 *)p = field_value; | |
5906 | return true; | |
5907 | case VMCS_FIELD_TYPE_U32: | |
5908 | *(u32 *)p = field_value; | |
5909 | return true; | |
5910 | case VMCS_FIELD_TYPE_U64: | |
5911 | *(u64 *)p = field_value; | |
5912 | return true; | |
5913 | case VMCS_FIELD_TYPE_NATURAL_WIDTH: | |
5914 | *(natural_width *)p = field_value; | |
5915 | return true; | |
5916 | default: | |
5917 | return false; /* can never happen. */ | |
5918 | } | |
5919 | ||
5920 | } | |
5921 | ||
5922 | static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx) | |
5923 | { | |
5924 | int i; | |
5925 | unsigned long field; | |
5926 | u64 field_value; | |
5927 | struct vmcs *shadow_vmcs = vmx->nested.current_shadow_vmcs; | |
5928 | unsigned long *fields = (unsigned long *)shadow_read_write_fields; | |
5929 | int num_fields = max_shadow_read_write_fields; | |
5930 | ||
5931 | vmcs_load(shadow_vmcs); | |
5932 | ||
5933 | for (i = 0; i < num_fields; i++) { | |
5934 | field = fields[i]; | |
5935 | switch (vmcs_field_type(field)) { | |
5936 | case VMCS_FIELD_TYPE_U16: | |
5937 | field_value = vmcs_read16(field); | |
5938 | break; | |
5939 | case VMCS_FIELD_TYPE_U32: | |
5940 | field_value = vmcs_read32(field); | |
5941 | break; | |
5942 | case VMCS_FIELD_TYPE_U64: | |
5943 | field_value = vmcs_read64(field); | |
5944 | break; | |
5945 | case VMCS_FIELD_TYPE_NATURAL_WIDTH: | |
5946 | field_value = vmcs_readl(field); | |
5947 | break; | |
5948 | } | |
5949 | vmcs12_write_any(&vmx->vcpu, field, field_value); | |
5950 | } | |
5951 | ||
5952 | vmcs_clear(shadow_vmcs); | |
5953 | vmcs_load(vmx->loaded_vmcs->vmcs); | |
5954 | } | |
5955 | ||
5956 | static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx) | |
5957 | { | |
5958 | unsigned long *fields[] = { | |
5959 | (unsigned long *)shadow_read_write_fields, | |
5960 | (unsigned long *)shadow_read_only_fields | |
5961 | }; | |
5962 | int num_lists = ARRAY_SIZE(fields); | |
5963 | int max_fields[] = { | |
5964 | max_shadow_read_write_fields, | |
5965 | max_shadow_read_only_fields | |
5966 | }; | |
5967 | int i, q; | |
5968 | unsigned long field; | |
5969 | u64 field_value = 0; | |
5970 | struct vmcs *shadow_vmcs = vmx->nested.current_shadow_vmcs; | |
5971 | ||
5972 | vmcs_load(shadow_vmcs); | |
5973 | ||
5974 | for (q = 0; q < num_lists; q++) { | |
5975 | for (i = 0; i < max_fields[q]; i++) { | |
5976 | field = fields[q][i]; | |
5977 | vmcs12_read_any(&vmx->vcpu, field, &field_value); | |
5978 | ||
5979 | switch (vmcs_field_type(field)) { | |
5980 | case VMCS_FIELD_TYPE_U16: | |
5981 | vmcs_write16(field, (u16)field_value); | |
5982 | break; | |
5983 | case VMCS_FIELD_TYPE_U32: | |
5984 | vmcs_write32(field, (u32)field_value); | |
5985 | break; | |
5986 | case VMCS_FIELD_TYPE_U64: | |
5987 | vmcs_write64(field, (u64)field_value); | |
5988 | break; | |
5989 | case VMCS_FIELD_TYPE_NATURAL_WIDTH: | |
5990 | vmcs_writel(field, (long)field_value); | |
5991 | break; | |
5992 | } | |
5993 | } | |
5994 | } | |
5995 | ||
5996 | vmcs_clear(shadow_vmcs); | |
5997 | vmcs_load(vmx->loaded_vmcs->vmcs); | |
5998 | } | |
5999 | ||
6000 | /* | |
6001 | * VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was | |
6002 | * used before) all generate the same failure when it is missing. | |
6003 | */ | |
6004 | static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu) | |
6005 | { | |
6006 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
6007 | if (vmx->nested.current_vmptr == -1ull) { | |
6008 | nested_vmx_failInvalid(vcpu); | |
6009 | skip_emulated_instruction(vcpu); | |
6010 | return 0; | |
6011 | } | |
6012 | return 1; | |
6013 | } | |
6014 | ||
6015 | static int handle_vmread(struct kvm_vcpu *vcpu) | |
6016 | { | |
6017 | unsigned long field; | |
6018 | u64 field_value; | |
6019 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
6020 | u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); | |
6021 | gva_t gva = 0; | |
6022 | ||
6023 | if (!nested_vmx_check_permission(vcpu) || | |
6024 | !nested_vmx_check_vmcs12(vcpu)) | |
6025 | return 1; | |
6026 | ||
6027 | /* Decode instruction info and find the field to read */ | |
6028 | field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); | |
6029 | /* Read the field, zero-extended to a u64 field_value */ | |
6030 | if (!vmcs12_read_any(vcpu, field, &field_value)) { | |
6031 | nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); | |
6032 | skip_emulated_instruction(vcpu); | |
6033 | return 1; | |
6034 | } | |
6035 | /* | |
6036 | * Now copy part of this value to register or memory, as requested. | |
6037 | * Note that the number of bits actually copied is 32 or 64 depending | |
6038 | * on the guest's mode (32 or 64 bit), not on the given field's length. | |
6039 | */ | |
6040 | if (vmx_instruction_info & (1u << 10)) { | |
6041 | kvm_register_write(vcpu, (((vmx_instruction_info) >> 3) & 0xf), | |
6042 | field_value); | |
6043 | } else { | |
6044 | if (get_vmx_mem_address(vcpu, exit_qualification, | |
6045 | vmx_instruction_info, &gva)) | |
6046 | return 1; | |
6047 | /* _system ok, as nested_vmx_check_permission verified cpl=0 */ | |
6048 | kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva, | |
6049 | &field_value, (is_long_mode(vcpu) ? 8 : 4), NULL); | |
6050 | } | |
6051 | ||
6052 | nested_vmx_succeed(vcpu); | |
6053 | skip_emulated_instruction(vcpu); | |
6054 | return 1; | |
6055 | } | |
6056 | ||
6057 | ||
6058 | static int handle_vmwrite(struct kvm_vcpu *vcpu) | |
6059 | { | |
6060 | unsigned long field; | |
6061 | gva_t gva; | |
6062 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
6063 | u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); | |
6064 | /* The value to write might be 32 or 64 bits, depending on L1's long | |
6065 | * mode, and eventually we need to write that into a field of several | |
6066 | * possible lengths. The code below first zero-extends the value to 64 | |
6067 | * bit (field_value), and then copies only the approriate number of | |
6068 | * bits into the vmcs12 field. | |
6069 | */ | |
6070 | u64 field_value = 0; | |
6071 | struct x86_exception e; | |
6072 | ||
6073 | if (!nested_vmx_check_permission(vcpu) || | |
6074 | !nested_vmx_check_vmcs12(vcpu)) | |
6075 | return 1; | |
6076 | ||
6077 | if (vmx_instruction_info & (1u << 10)) | |
6078 | field_value = kvm_register_read(vcpu, | |
6079 | (((vmx_instruction_info) >> 3) & 0xf)); | |
6080 | else { | |
6081 | if (get_vmx_mem_address(vcpu, exit_qualification, | |
6082 | vmx_instruction_info, &gva)) | |
6083 | return 1; | |
6084 | if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, | |
6085 | &field_value, (is_long_mode(vcpu) ? 8 : 4), &e)) { | |
6086 | kvm_inject_page_fault(vcpu, &e); | |
6087 | return 1; | |
6088 | } | |
6089 | } | |
6090 | ||
6091 | ||
6092 | field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); | |
6093 | if (vmcs_field_readonly(field)) { | |
6094 | nested_vmx_failValid(vcpu, | |
6095 | VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT); | |
6096 | skip_emulated_instruction(vcpu); | |
6097 | return 1; | |
6098 | } | |
6099 | ||
6100 | if (!vmcs12_write_any(vcpu, field, field_value)) { | |
6101 | nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); | |
6102 | skip_emulated_instruction(vcpu); | |
6103 | return 1; | |
6104 | } | |
6105 | ||
6106 | nested_vmx_succeed(vcpu); | |
6107 | skip_emulated_instruction(vcpu); | |
6108 | return 1; | |
6109 | } | |
6110 | ||
6111 | /* Emulate the VMPTRLD instruction */ | |
6112 | static int handle_vmptrld(struct kvm_vcpu *vcpu) | |
6113 | { | |
6114 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
6115 | gva_t gva; | |
6116 | gpa_t vmptr; | |
6117 | struct x86_exception e; | |
6118 | u32 exec_control; | |
6119 | ||
6120 | if (!nested_vmx_check_permission(vcpu)) | |
6121 | return 1; | |
6122 | ||
6123 | if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION), | |
6124 | vmcs_read32(VMX_INSTRUCTION_INFO), &gva)) | |
6125 | return 1; | |
6126 | ||
6127 | if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr, | |
6128 | sizeof(vmptr), &e)) { | |
6129 | kvm_inject_page_fault(vcpu, &e); | |
6130 | return 1; | |
6131 | } | |
6132 | ||
6133 | if (!IS_ALIGNED(vmptr, PAGE_SIZE)) { | |
6134 | nested_vmx_failValid(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS); | |
6135 | skip_emulated_instruction(vcpu); | |
6136 | return 1; | |
6137 | } | |
6138 | ||
6139 | if (vmx->nested.current_vmptr != vmptr) { | |
6140 | struct vmcs12 *new_vmcs12; | |
6141 | struct page *page; | |
6142 | page = nested_get_page(vcpu, vmptr); | |
6143 | if (page == NULL) { | |
6144 | nested_vmx_failInvalid(vcpu); | |
6145 | skip_emulated_instruction(vcpu); | |
6146 | return 1; | |
6147 | } | |
6148 | new_vmcs12 = kmap(page); | |
6149 | if (new_vmcs12->revision_id != VMCS12_REVISION) { | |
6150 | kunmap(page); | |
6151 | nested_release_page_clean(page); | |
6152 | nested_vmx_failValid(vcpu, | |
6153 | VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID); | |
6154 | skip_emulated_instruction(vcpu); | |
6155 | return 1; | |
6156 | } | |
6157 | if (vmx->nested.current_vmptr != -1ull) | |
6158 | nested_release_vmcs12(vmx); | |
6159 | ||
6160 | vmx->nested.current_vmptr = vmptr; | |
6161 | vmx->nested.current_vmcs12 = new_vmcs12; | |
6162 | vmx->nested.current_vmcs12_page = page; | |
6163 | if (enable_shadow_vmcs) { | |
6164 | exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); | |
6165 | exec_control |= SECONDARY_EXEC_SHADOW_VMCS; | |
6166 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); | |
6167 | vmcs_write64(VMCS_LINK_POINTER, | |
6168 | __pa(vmx->nested.current_shadow_vmcs)); | |
6169 | vmx->nested.sync_shadow_vmcs = true; | |
6170 | } | |
6171 | } | |
6172 | ||
6173 | nested_vmx_succeed(vcpu); | |
6174 | skip_emulated_instruction(vcpu); | |
6175 | return 1; | |
6176 | } | |
6177 | ||
6178 | /* Emulate the VMPTRST instruction */ | |
6179 | static int handle_vmptrst(struct kvm_vcpu *vcpu) | |
6180 | { | |
6181 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
6182 | u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); | |
6183 | gva_t vmcs_gva; | |
6184 | struct x86_exception e; | |
6185 | ||
6186 | if (!nested_vmx_check_permission(vcpu)) | |
6187 | return 1; | |
6188 | ||
6189 | if (get_vmx_mem_address(vcpu, exit_qualification, | |
6190 | vmx_instruction_info, &vmcs_gva)) | |
6191 | return 1; | |
6192 | /* ok to use *_system, as nested_vmx_check_permission verified cpl=0 */ | |
6193 | if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva, | |
6194 | (void *)&to_vmx(vcpu)->nested.current_vmptr, | |
6195 | sizeof(u64), &e)) { | |
6196 | kvm_inject_page_fault(vcpu, &e); | |
6197 | return 1; | |
6198 | } | |
6199 | nested_vmx_succeed(vcpu); | |
6200 | skip_emulated_instruction(vcpu); | |
6201 | return 1; | |
6202 | } | |
6203 | ||
6204 | /* | |
6205 | * The exit handlers return 1 if the exit was handled fully and guest execution | |
6206 | * may resume. Otherwise they set the kvm_run parameter to indicate what needs | |
6207 | * to be done to userspace and return 0. | |
6208 | */ | |
6209 | static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { | |
6210 | [EXIT_REASON_EXCEPTION_NMI] = handle_exception, | |
6211 | [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, | |
6212 | [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, | |
6213 | [EXIT_REASON_NMI_WINDOW] = handle_nmi_window, | |
6214 | [EXIT_REASON_IO_INSTRUCTION] = handle_io, | |
6215 | [EXIT_REASON_CR_ACCESS] = handle_cr, | |
6216 | [EXIT_REASON_DR_ACCESS] = handle_dr, | |
6217 | [EXIT_REASON_CPUID] = handle_cpuid, | |
6218 | [EXIT_REASON_MSR_READ] = handle_rdmsr, | |
6219 | [EXIT_REASON_MSR_WRITE] = handle_wrmsr, | |
6220 | [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window, | |
6221 | [EXIT_REASON_HLT] = handle_halt, | |
6222 | [EXIT_REASON_INVD] = handle_invd, | |
6223 | [EXIT_REASON_INVLPG] = handle_invlpg, | |
6224 | [EXIT_REASON_RDPMC] = handle_rdpmc, | |
6225 | [EXIT_REASON_VMCALL] = handle_vmcall, | |
6226 | [EXIT_REASON_VMCLEAR] = handle_vmclear, | |
6227 | [EXIT_REASON_VMLAUNCH] = handle_vmlaunch, | |
6228 | [EXIT_REASON_VMPTRLD] = handle_vmptrld, | |
6229 | [EXIT_REASON_VMPTRST] = handle_vmptrst, | |
6230 | [EXIT_REASON_VMREAD] = handle_vmread, | |
6231 | [EXIT_REASON_VMRESUME] = handle_vmresume, | |
6232 | [EXIT_REASON_VMWRITE] = handle_vmwrite, | |
6233 | [EXIT_REASON_VMOFF] = handle_vmoff, | |
6234 | [EXIT_REASON_VMON] = handle_vmon, | |
6235 | [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold, | |
6236 | [EXIT_REASON_APIC_ACCESS] = handle_apic_access, | |
6237 | [EXIT_REASON_APIC_WRITE] = handle_apic_write, | |
6238 | [EXIT_REASON_EOI_INDUCED] = handle_apic_eoi_induced, | |
6239 | [EXIT_REASON_WBINVD] = handle_wbinvd, | |
6240 | [EXIT_REASON_XSETBV] = handle_xsetbv, | |
6241 | [EXIT_REASON_TASK_SWITCH] = handle_task_switch, | |
6242 | [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check, | |
6243 | [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation, | |
6244 | [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig, | |
6245 | [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause, | |
6246 | [EXIT_REASON_MWAIT_INSTRUCTION] = handle_invalid_op, | |
6247 | [EXIT_REASON_MONITOR_INSTRUCTION] = handle_invalid_op, | |
6248 | }; | |
6249 | ||
6250 | static const int kvm_vmx_max_exit_handlers = | |
6251 | ARRAY_SIZE(kvm_vmx_exit_handlers); | |
6252 | ||
6253 | static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu, | |
6254 | struct vmcs12 *vmcs12) | |
6255 | { | |
6256 | unsigned long exit_qualification; | |
6257 | gpa_t bitmap, last_bitmap; | |
6258 | unsigned int port; | |
6259 | int size; | |
6260 | u8 b; | |
6261 | ||
6262 | if (nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING)) | |
6263 | return 1; | |
6264 | ||
6265 | if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS)) | |
6266 | return 0; | |
6267 | ||
6268 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
6269 | ||
6270 | port = exit_qualification >> 16; | |
6271 | size = (exit_qualification & 7) + 1; | |
6272 | ||
6273 | last_bitmap = (gpa_t)-1; | |
6274 | b = -1; | |
6275 | ||
6276 | while (size > 0) { | |
6277 | if (port < 0x8000) | |
6278 | bitmap = vmcs12->io_bitmap_a; | |
6279 | else if (port < 0x10000) | |
6280 | bitmap = vmcs12->io_bitmap_b; | |
6281 | else | |
6282 | return 1; | |
6283 | bitmap += (port & 0x7fff) / 8; | |
6284 | ||
6285 | if (last_bitmap != bitmap) | |
6286 | if (kvm_read_guest(vcpu->kvm, bitmap, &b, 1)) | |
6287 | return 1; | |
6288 | if (b & (1 << (port & 7))) | |
6289 | return 1; | |
6290 | ||
6291 | port++; | |
6292 | size--; | |
6293 | last_bitmap = bitmap; | |
6294 | } | |
6295 | ||
6296 | return 0; | |
6297 | } | |
6298 | ||
6299 | /* | |
6300 | * Return 1 if we should exit from L2 to L1 to handle an MSR access access, | |
6301 | * rather than handle it ourselves in L0. I.e., check whether L1 expressed | |
6302 | * disinterest in the current event (read or write a specific MSR) by using an | |
6303 | * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps. | |
6304 | */ | |
6305 | static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu, | |
6306 | struct vmcs12 *vmcs12, u32 exit_reason) | |
6307 | { | |
6308 | u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX]; | |
6309 | gpa_t bitmap; | |
6310 | ||
6311 | if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS)) | |
6312 | return 1; | |
6313 | ||
6314 | /* | |
6315 | * The MSR_BITMAP page is divided into four 1024-byte bitmaps, | |
6316 | * for the four combinations of read/write and low/high MSR numbers. | |
6317 | * First we need to figure out which of the four to use: | |
6318 | */ | |
6319 | bitmap = vmcs12->msr_bitmap; | |
6320 | if (exit_reason == EXIT_REASON_MSR_WRITE) | |
6321 | bitmap += 2048; | |
6322 | if (msr_index >= 0xc0000000) { | |
6323 | msr_index -= 0xc0000000; | |
6324 | bitmap += 1024; | |
6325 | } | |
6326 | ||
6327 | /* Then read the msr_index'th bit from this bitmap: */ | |
6328 | if (msr_index < 1024*8) { | |
6329 | unsigned char b; | |
6330 | if (kvm_read_guest(vcpu->kvm, bitmap + msr_index/8, &b, 1)) | |
6331 | return 1; | |
6332 | return 1 & (b >> (msr_index & 7)); | |
6333 | } else | |
6334 | return 1; /* let L1 handle the wrong parameter */ | |
6335 | } | |
6336 | ||
6337 | /* | |
6338 | * Return 1 if we should exit from L2 to L1 to handle a CR access exit, | |
6339 | * rather than handle it ourselves in L0. I.e., check if L1 wanted to | |
6340 | * intercept (via guest_host_mask etc.) the current event. | |
6341 | */ | |
6342 | static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu, | |
6343 | struct vmcs12 *vmcs12) | |
6344 | { | |
6345 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
6346 | int cr = exit_qualification & 15; | |
6347 | int reg = (exit_qualification >> 8) & 15; | |
6348 | unsigned long val = kvm_register_read(vcpu, reg); | |
6349 | ||
6350 | switch ((exit_qualification >> 4) & 3) { | |
6351 | case 0: /* mov to cr */ | |
6352 | switch (cr) { | |
6353 | case 0: | |
6354 | if (vmcs12->cr0_guest_host_mask & | |
6355 | (val ^ vmcs12->cr0_read_shadow)) | |
6356 | return 1; | |
6357 | break; | |
6358 | case 3: | |
6359 | if ((vmcs12->cr3_target_count >= 1 && | |
6360 | vmcs12->cr3_target_value0 == val) || | |
6361 | (vmcs12->cr3_target_count >= 2 && | |
6362 | vmcs12->cr3_target_value1 == val) || | |
6363 | (vmcs12->cr3_target_count >= 3 && | |
6364 | vmcs12->cr3_target_value2 == val) || | |
6365 | (vmcs12->cr3_target_count >= 4 && | |
6366 | vmcs12->cr3_target_value3 == val)) | |
6367 | return 0; | |
6368 | if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING)) | |
6369 | return 1; | |
6370 | break; | |
6371 | case 4: | |
6372 | if (vmcs12->cr4_guest_host_mask & | |
6373 | (vmcs12->cr4_read_shadow ^ val)) | |
6374 | return 1; | |
6375 | break; | |
6376 | case 8: | |
6377 | if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING)) | |
6378 | return 1; | |
6379 | break; | |
6380 | } | |
6381 | break; | |
6382 | case 2: /* clts */ | |
6383 | if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) && | |
6384 | (vmcs12->cr0_read_shadow & X86_CR0_TS)) | |
6385 | return 1; | |
6386 | break; | |
6387 | case 1: /* mov from cr */ | |
6388 | switch (cr) { | |
6389 | case 3: | |
6390 | if (vmcs12->cpu_based_vm_exec_control & | |
6391 | CPU_BASED_CR3_STORE_EXITING) | |
6392 | return 1; | |
6393 | break; | |
6394 | case 8: | |
6395 | if (vmcs12->cpu_based_vm_exec_control & | |
6396 | CPU_BASED_CR8_STORE_EXITING) | |
6397 | return 1; | |
6398 | break; | |
6399 | } | |
6400 | break; | |
6401 | case 3: /* lmsw */ | |
6402 | /* | |
6403 | * lmsw can change bits 1..3 of cr0, and only set bit 0 of | |
6404 | * cr0. Other attempted changes are ignored, with no exit. | |
6405 | */ | |
6406 | if (vmcs12->cr0_guest_host_mask & 0xe & | |
6407 | (val ^ vmcs12->cr0_read_shadow)) | |
6408 | return 1; | |
6409 | if ((vmcs12->cr0_guest_host_mask & 0x1) && | |
6410 | !(vmcs12->cr0_read_shadow & 0x1) && | |
6411 | (val & 0x1)) | |
6412 | return 1; | |
6413 | break; | |
6414 | } | |
6415 | return 0; | |
6416 | } | |
6417 | ||
6418 | /* | |
6419 | * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we | |
6420 | * should handle it ourselves in L0 (and then continue L2). Only call this | |
6421 | * when in is_guest_mode (L2). | |
6422 | */ | |
6423 | static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu) | |
6424 | { | |
6425 | u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
6426 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
6427 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
6428 | u32 exit_reason = vmx->exit_reason; | |
6429 | ||
6430 | if (vmx->nested.nested_run_pending) | |
6431 | return 0; | |
6432 | ||
6433 | if (unlikely(vmx->fail)) { | |
6434 | pr_info_ratelimited("%s failed vm entry %x\n", __func__, | |
6435 | vmcs_read32(VM_INSTRUCTION_ERROR)); | |
6436 | return 1; | |
6437 | } | |
6438 | ||
6439 | switch (exit_reason) { | |
6440 | case EXIT_REASON_EXCEPTION_NMI: | |
6441 | if (!is_exception(intr_info)) | |
6442 | return 0; | |
6443 | else if (is_page_fault(intr_info)) | |
6444 | return enable_ept; | |
6445 | return vmcs12->exception_bitmap & | |
6446 | (1u << (intr_info & INTR_INFO_VECTOR_MASK)); | |
6447 | case EXIT_REASON_EXTERNAL_INTERRUPT: | |
6448 | return 0; | |
6449 | case EXIT_REASON_TRIPLE_FAULT: | |
6450 | return 1; | |
6451 | case EXIT_REASON_PENDING_INTERRUPT: | |
6452 | return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_INTR_PENDING); | |
6453 | case EXIT_REASON_NMI_WINDOW: | |
6454 | return nested_cpu_has(vmcs12, CPU_BASED_VIRTUAL_NMI_PENDING); | |
6455 | case EXIT_REASON_TASK_SWITCH: | |
6456 | return 1; | |
6457 | case EXIT_REASON_CPUID: | |
6458 | return 1; | |
6459 | case EXIT_REASON_HLT: | |
6460 | return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING); | |
6461 | case EXIT_REASON_INVD: | |
6462 | return 1; | |
6463 | case EXIT_REASON_INVLPG: | |
6464 | return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING); | |
6465 | case EXIT_REASON_RDPMC: | |
6466 | return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING); | |
6467 | case EXIT_REASON_RDTSC: | |
6468 | return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING); | |
6469 | case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR: | |
6470 | case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD: | |
6471 | case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD: | |
6472 | case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE: | |
6473 | case EXIT_REASON_VMOFF: case EXIT_REASON_VMON: | |
6474 | /* | |
6475 | * VMX instructions trap unconditionally. This allows L1 to | |
6476 | * emulate them for its L2 guest, i.e., allows 3-level nesting! | |
6477 | */ | |
6478 | return 1; | |
6479 | case EXIT_REASON_CR_ACCESS: | |
6480 | return nested_vmx_exit_handled_cr(vcpu, vmcs12); | |
6481 | case EXIT_REASON_DR_ACCESS: | |
6482 | return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING); | |
6483 | case EXIT_REASON_IO_INSTRUCTION: | |
6484 | return nested_vmx_exit_handled_io(vcpu, vmcs12); | |
6485 | case EXIT_REASON_MSR_READ: | |
6486 | case EXIT_REASON_MSR_WRITE: | |
6487 | return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason); | |
6488 | case EXIT_REASON_INVALID_STATE: | |
6489 | return 1; | |
6490 | case EXIT_REASON_MWAIT_INSTRUCTION: | |
6491 | return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING); | |
6492 | case EXIT_REASON_MONITOR_INSTRUCTION: | |
6493 | return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING); | |
6494 | case EXIT_REASON_PAUSE_INSTRUCTION: | |
6495 | return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) || | |
6496 | nested_cpu_has2(vmcs12, | |
6497 | SECONDARY_EXEC_PAUSE_LOOP_EXITING); | |
6498 | case EXIT_REASON_MCE_DURING_VMENTRY: | |
6499 | return 0; | |
6500 | case EXIT_REASON_TPR_BELOW_THRESHOLD: | |
6501 | return 1; | |
6502 | case EXIT_REASON_APIC_ACCESS: | |
6503 | return nested_cpu_has2(vmcs12, | |
6504 | SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES); | |
6505 | case EXIT_REASON_EPT_VIOLATION: | |
6506 | case EXIT_REASON_EPT_MISCONFIG: | |
6507 | return 0; | |
6508 | case EXIT_REASON_PREEMPTION_TIMER: | |
6509 | return vmcs12->pin_based_vm_exec_control & | |
6510 | PIN_BASED_VMX_PREEMPTION_TIMER; | |
6511 | case EXIT_REASON_WBINVD: | |
6512 | return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING); | |
6513 | case EXIT_REASON_XSETBV: | |
6514 | return 1; | |
6515 | default: | |
6516 | return 1; | |
6517 | } | |
6518 | } | |
6519 | ||
6520 | static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2) | |
6521 | { | |
6522 | *info1 = vmcs_readl(EXIT_QUALIFICATION); | |
6523 | *info2 = vmcs_read32(VM_EXIT_INTR_INFO); | |
6524 | } | |
6525 | ||
6526 | /* | |
6527 | * The guest has exited. See if we can fix it or if we need userspace | |
6528 | * assistance. | |
6529 | */ | |
6530 | static int vmx_handle_exit(struct kvm_vcpu *vcpu) | |
6531 | { | |
6532 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
6533 | u32 exit_reason = vmx->exit_reason; | |
6534 | u32 vectoring_info = vmx->idt_vectoring_info; | |
6535 | ||
6536 | /* If guest state is invalid, start emulating */ | |
6537 | if (vmx->emulation_required) | |
6538 | return handle_invalid_guest_state(vcpu); | |
6539 | ||
6540 | /* | |
6541 | * the KVM_REQ_EVENT optimization bit is only on for one entry, and if | |
6542 | * we did not inject a still-pending event to L1 now because of | |
6543 | * nested_run_pending, we need to re-enable this bit. | |
6544 | */ | |
6545 | if (vmx->nested.nested_run_pending) | |
6546 | kvm_make_request(KVM_REQ_EVENT, vcpu); | |
6547 | ||
6548 | if (!is_guest_mode(vcpu) && (exit_reason == EXIT_REASON_VMLAUNCH || | |
6549 | exit_reason == EXIT_REASON_VMRESUME)) | |
6550 | vmx->nested.nested_run_pending = 1; | |
6551 | else | |
6552 | vmx->nested.nested_run_pending = 0; | |
6553 | ||
6554 | if (is_guest_mode(vcpu) && nested_vmx_exit_handled(vcpu)) { | |
6555 | nested_vmx_vmexit(vcpu); | |
6556 | return 1; | |
6557 | } | |
6558 | ||
6559 | if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) { | |
6560 | vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; | |
6561 | vcpu->run->fail_entry.hardware_entry_failure_reason | |
6562 | = exit_reason; | |
6563 | return 0; | |
6564 | } | |
6565 | ||
6566 | if (unlikely(vmx->fail)) { | |
6567 | vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; | |
6568 | vcpu->run->fail_entry.hardware_entry_failure_reason | |
6569 | = vmcs_read32(VM_INSTRUCTION_ERROR); | |
6570 | return 0; | |
6571 | } | |
6572 | ||
6573 | /* | |
6574 | * Note: | |
6575 | * Do not try to fix EXIT_REASON_EPT_MISCONFIG if it caused by | |
6576 | * delivery event since it indicates guest is accessing MMIO. | |
6577 | * The vm-exit can be triggered again after return to guest that | |
6578 | * will cause infinite loop. | |
6579 | */ | |
6580 | if ((vectoring_info & VECTORING_INFO_VALID_MASK) && | |
6581 | (exit_reason != EXIT_REASON_EXCEPTION_NMI && | |
6582 | exit_reason != EXIT_REASON_EPT_VIOLATION && | |
6583 | exit_reason != EXIT_REASON_TASK_SWITCH)) { | |
6584 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
6585 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_DELIVERY_EV; | |
6586 | vcpu->run->internal.ndata = 2; | |
6587 | vcpu->run->internal.data[0] = vectoring_info; | |
6588 | vcpu->run->internal.data[1] = exit_reason; | |
6589 | return 0; | |
6590 | } | |
6591 | ||
6592 | if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked && | |
6593 | !(is_guest_mode(vcpu) && nested_cpu_has_virtual_nmis( | |
6594 | get_vmcs12(vcpu), vcpu)))) { | |
6595 | if (vmx_interrupt_allowed(vcpu)) { | |
6596 | vmx->soft_vnmi_blocked = 0; | |
6597 | } else if (vmx->vnmi_blocked_time > 1000000000LL && | |
6598 | vcpu->arch.nmi_pending) { | |
6599 | /* | |
6600 | * This CPU don't support us in finding the end of an | |
6601 | * NMI-blocked window if the guest runs with IRQs | |
6602 | * disabled. So we pull the trigger after 1 s of | |
6603 | * futile waiting, but inform the user about this. | |
6604 | */ | |
6605 | printk(KERN_WARNING "%s: Breaking out of NMI-blocked " | |
6606 | "state on VCPU %d after 1 s timeout\n", | |
6607 | __func__, vcpu->vcpu_id); | |
6608 | vmx->soft_vnmi_blocked = 0; | |
6609 | } | |
6610 | } | |
6611 | ||
6612 | if (exit_reason < kvm_vmx_max_exit_handlers | |
6613 | && kvm_vmx_exit_handlers[exit_reason]) | |
6614 | return kvm_vmx_exit_handlers[exit_reason](vcpu); | |
6615 | else { | |
6616 | vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; | |
6617 | vcpu->run->hw.hardware_exit_reason = exit_reason; | |
6618 | } | |
6619 | return 0; | |
6620 | } | |
6621 | ||
6622 | static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) | |
6623 | { | |
6624 | if (irr == -1 || tpr < irr) { | |
6625 | vmcs_write32(TPR_THRESHOLD, 0); | |
6626 | return; | |
6627 | } | |
6628 | ||
6629 | vmcs_write32(TPR_THRESHOLD, irr); | |
6630 | } | |
6631 | ||
6632 | static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set) | |
6633 | { | |
6634 | u32 sec_exec_control; | |
6635 | ||
6636 | /* | |
6637 | * There is not point to enable virtualize x2apic without enable | |
6638 | * apicv | |
6639 | */ | |
6640 | if (!cpu_has_vmx_virtualize_x2apic_mode() || | |
6641 | !vmx_vm_has_apicv(vcpu->kvm)) | |
6642 | return; | |
6643 | ||
6644 | if (!vm_need_tpr_shadow(vcpu->kvm)) | |
6645 | return; | |
6646 | ||
6647 | sec_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); | |
6648 | ||
6649 | if (set) { | |
6650 | sec_exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
6651 | sec_exec_control |= SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; | |
6652 | } else { | |
6653 | sec_exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; | |
6654 | sec_exec_control |= SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
6655 | } | |
6656 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, sec_exec_control); | |
6657 | ||
6658 | vmx_set_msr_bitmap(vcpu); | |
6659 | } | |
6660 | ||
6661 | static void vmx_hwapic_isr_update(struct kvm *kvm, int isr) | |
6662 | { | |
6663 | u16 status; | |
6664 | u8 old; | |
6665 | ||
6666 | if (!vmx_vm_has_apicv(kvm)) | |
6667 | return; | |
6668 | ||
6669 | if (isr == -1) | |
6670 | isr = 0; | |
6671 | ||
6672 | status = vmcs_read16(GUEST_INTR_STATUS); | |
6673 | old = status >> 8; | |
6674 | if (isr != old) { | |
6675 | status &= 0xff; | |
6676 | status |= isr << 8; | |
6677 | vmcs_write16(GUEST_INTR_STATUS, status); | |
6678 | } | |
6679 | } | |
6680 | ||
6681 | static void vmx_set_rvi(int vector) | |
6682 | { | |
6683 | u16 status; | |
6684 | u8 old; | |
6685 | ||
6686 | status = vmcs_read16(GUEST_INTR_STATUS); | |
6687 | old = (u8)status & 0xff; | |
6688 | if ((u8)vector != old) { | |
6689 | status &= ~0xff; | |
6690 | status |= (u8)vector; | |
6691 | vmcs_write16(GUEST_INTR_STATUS, status); | |
6692 | } | |
6693 | } | |
6694 | ||
6695 | static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr) | |
6696 | { | |
6697 | if (max_irr == -1) | |
6698 | return; | |
6699 | ||
6700 | vmx_set_rvi(max_irr); | |
6701 | } | |
6702 | ||
6703 | static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap) | |
6704 | { | |
6705 | if (!vmx_vm_has_apicv(vcpu->kvm)) | |
6706 | return; | |
6707 | ||
6708 | vmcs_write64(EOI_EXIT_BITMAP0, eoi_exit_bitmap[0]); | |
6709 | vmcs_write64(EOI_EXIT_BITMAP1, eoi_exit_bitmap[1]); | |
6710 | vmcs_write64(EOI_EXIT_BITMAP2, eoi_exit_bitmap[2]); | |
6711 | vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]); | |
6712 | } | |
6713 | ||
6714 | static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx) | |
6715 | { | |
6716 | u32 exit_intr_info; | |
6717 | ||
6718 | if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY | |
6719 | || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI)) | |
6720 | return; | |
6721 | ||
6722 | vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
6723 | exit_intr_info = vmx->exit_intr_info; | |
6724 | ||
6725 | /* Handle machine checks before interrupts are enabled */ | |
6726 | if (is_machine_check(exit_intr_info)) | |
6727 | kvm_machine_check(); | |
6728 | ||
6729 | /* We need to handle NMIs before interrupts are enabled */ | |
6730 | if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR && | |
6731 | (exit_intr_info & INTR_INFO_VALID_MASK)) { | |
6732 | kvm_before_handle_nmi(&vmx->vcpu); | |
6733 | asm("int $2"); | |
6734 | kvm_after_handle_nmi(&vmx->vcpu); | |
6735 | } | |
6736 | } | |
6737 | ||
6738 | static void vmx_handle_external_intr(struct kvm_vcpu *vcpu) | |
6739 | { | |
6740 | u32 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
6741 | ||
6742 | /* | |
6743 | * If external interrupt exists, IF bit is set in rflags/eflags on the | |
6744 | * interrupt stack frame, and interrupt will be enabled on a return | |
6745 | * from interrupt handler. | |
6746 | */ | |
6747 | if ((exit_intr_info & (INTR_INFO_VALID_MASK | INTR_INFO_INTR_TYPE_MASK)) | |
6748 | == (INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR)) { | |
6749 | unsigned int vector; | |
6750 | unsigned long entry; | |
6751 | gate_desc *desc; | |
6752 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
6753 | #ifdef CONFIG_X86_64 | |
6754 | unsigned long tmp; | |
6755 | #endif | |
6756 | ||
6757 | vector = exit_intr_info & INTR_INFO_VECTOR_MASK; | |
6758 | desc = (gate_desc *)vmx->host_idt_base + vector; | |
6759 | entry = gate_offset(*desc); | |
6760 | asm volatile( | |
6761 | #ifdef CONFIG_X86_64 | |
6762 | "mov %%" _ASM_SP ", %[sp]\n\t" | |
6763 | "and $0xfffffffffffffff0, %%" _ASM_SP "\n\t" | |
6764 | "push $%c[ss]\n\t" | |
6765 | "push %[sp]\n\t" | |
6766 | #endif | |
6767 | "pushf\n\t" | |
6768 | "orl $0x200, (%%" _ASM_SP ")\n\t" | |
6769 | __ASM_SIZE(push) " $%c[cs]\n\t" | |
6770 | "call *%[entry]\n\t" | |
6771 | : | |
6772 | #ifdef CONFIG_X86_64 | |
6773 | [sp]"=&r"(tmp) | |
6774 | #endif | |
6775 | : | |
6776 | [entry]"r"(entry), | |
6777 | [ss]"i"(__KERNEL_DS), | |
6778 | [cs]"i"(__KERNEL_CS) | |
6779 | ); | |
6780 | } else | |
6781 | local_irq_enable(); | |
6782 | } | |
6783 | ||
6784 | static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx) | |
6785 | { | |
6786 | u32 exit_intr_info; | |
6787 | bool unblock_nmi; | |
6788 | u8 vector; | |
6789 | bool idtv_info_valid; | |
6790 | ||
6791 | idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK; | |
6792 | ||
6793 | if (cpu_has_virtual_nmis()) { | |
6794 | if (vmx->nmi_known_unmasked) | |
6795 | return; | |
6796 | /* | |
6797 | * Can't use vmx->exit_intr_info since we're not sure what | |
6798 | * the exit reason is. | |
6799 | */ | |
6800 | exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
6801 | unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0; | |
6802 | vector = exit_intr_info & INTR_INFO_VECTOR_MASK; | |
6803 | /* | |
6804 | * SDM 3: 27.7.1.2 (September 2008) | |
6805 | * Re-set bit "block by NMI" before VM entry if vmexit caused by | |
6806 | * a guest IRET fault. | |
6807 | * SDM 3: 23.2.2 (September 2008) | |
6808 | * Bit 12 is undefined in any of the following cases: | |
6809 | * If the VM exit sets the valid bit in the IDT-vectoring | |
6810 | * information field. | |
6811 | * If the VM exit is due to a double fault. | |
6812 | */ | |
6813 | if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi && | |
6814 | vector != DF_VECTOR && !idtv_info_valid) | |
6815 | vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, | |
6816 | GUEST_INTR_STATE_NMI); | |
6817 | else | |
6818 | vmx->nmi_known_unmasked = | |
6819 | !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) | |
6820 | & GUEST_INTR_STATE_NMI); | |
6821 | } else if (unlikely(vmx->soft_vnmi_blocked)) | |
6822 | vmx->vnmi_blocked_time += | |
6823 | ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time)); | |
6824 | } | |
6825 | ||
6826 | static void __vmx_complete_interrupts(struct kvm_vcpu *vcpu, | |
6827 | u32 idt_vectoring_info, | |
6828 | int instr_len_field, | |
6829 | int error_code_field) | |
6830 | { | |
6831 | u8 vector; | |
6832 | int type; | |
6833 | bool idtv_info_valid; | |
6834 | ||
6835 | idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; | |
6836 | ||
6837 | vcpu->arch.nmi_injected = false; | |
6838 | kvm_clear_exception_queue(vcpu); | |
6839 | kvm_clear_interrupt_queue(vcpu); | |
6840 | ||
6841 | if (!idtv_info_valid) | |
6842 | return; | |
6843 | ||
6844 | kvm_make_request(KVM_REQ_EVENT, vcpu); | |
6845 | ||
6846 | vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; | |
6847 | type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; | |
6848 | ||
6849 | switch (type) { | |
6850 | case INTR_TYPE_NMI_INTR: | |
6851 | vcpu->arch.nmi_injected = true; | |
6852 | /* | |
6853 | * SDM 3: 27.7.1.2 (September 2008) | |
6854 | * Clear bit "block by NMI" before VM entry if a NMI | |
6855 | * delivery faulted. | |
6856 | */ | |
6857 | vmx_set_nmi_mask(vcpu, false); | |
6858 | break; | |
6859 | case INTR_TYPE_SOFT_EXCEPTION: | |
6860 | vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field); | |
6861 | /* fall through */ | |
6862 | case INTR_TYPE_HARD_EXCEPTION: | |
6863 | if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { | |
6864 | u32 err = vmcs_read32(error_code_field); | |
6865 | kvm_queue_exception_e(vcpu, vector, err); | |
6866 | } else | |
6867 | kvm_queue_exception(vcpu, vector); | |
6868 | break; | |
6869 | case INTR_TYPE_SOFT_INTR: | |
6870 | vcpu->arch.event_exit_inst_len = vmcs_read32(instr_len_field); | |
6871 | /* fall through */ | |
6872 | case INTR_TYPE_EXT_INTR: | |
6873 | kvm_queue_interrupt(vcpu, vector, type == INTR_TYPE_SOFT_INTR); | |
6874 | break; | |
6875 | default: | |
6876 | break; | |
6877 | } | |
6878 | } | |
6879 | ||
6880 | static void vmx_complete_interrupts(struct vcpu_vmx *vmx) | |
6881 | { | |
6882 | __vmx_complete_interrupts(&vmx->vcpu, vmx->idt_vectoring_info, | |
6883 | VM_EXIT_INSTRUCTION_LEN, | |
6884 | IDT_VECTORING_ERROR_CODE); | |
6885 | } | |
6886 | ||
6887 | static void vmx_cancel_injection(struct kvm_vcpu *vcpu) | |
6888 | { | |
6889 | __vmx_complete_interrupts(vcpu, | |
6890 | vmcs_read32(VM_ENTRY_INTR_INFO_FIELD), | |
6891 | VM_ENTRY_INSTRUCTION_LEN, | |
6892 | VM_ENTRY_EXCEPTION_ERROR_CODE); | |
6893 | ||
6894 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); | |
6895 | } | |
6896 | ||
6897 | static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) | |
6898 | { | |
6899 | int i, nr_msrs; | |
6900 | struct perf_guest_switch_msr *msrs; | |
6901 | ||
6902 | msrs = perf_guest_get_msrs(&nr_msrs); | |
6903 | ||
6904 | if (!msrs) | |
6905 | return; | |
6906 | ||
6907 | for (i = 0; i < nr_msrs; i++) | |
6908 | if (msrs[i].host == msrs[i].guest) | |
6909 | clear_atomic_switch_msr(vmx, msrs[i].msr); | |
6910 | else | |
6911 | add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest, | |
6912 | msrs[i].host); | |
6913 | } | |
6914 | ||
6915 | static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) | |
6916 | { | |
6917 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
6918 | unsigned long debugctlmsr; | |
6919 | ||
6920 | /* Record the guest's net vcpu time for enforced NMI injections. */ | |
6921 | if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) | |
6922 | vmx->entry_time = ktime_get(); | |
6923 | ||
6924 | /* Don't enter VMX if guest state is invalid, let the exit handler | |
6925 | start emulation until we arrive back to a valid state */ | |
6926 | if (vmx->emulation_required) | |
6927 | return; | |
6928 | ||
6929 | if (vmx->nested.sync_shadow_vmcs) { | |
6930 | copy_vmcs12_to_shadow(vmx); | |
6931 | vmx->nested.sync_shadow_vmcs = false; | |
6932 | } | |
6933 | ||
6934 | if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty)) | |
6935 | vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); | |
6936 | if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty)) | |
6937 | vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]); | |
6938 | ||
6939 | /* When single-stepping over STI and MOV SS, we must clear the | |
6940 | * corresponding interruptibility bits in the guest state. Otherwise | |
6941 | * vmentry fails as it then expects bit 14 (BS) in pending debug | |
6942 | * exceptions being set, but that's not correct for the guest debugging | |
6943 | * case. */ | |
6944 | if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) | |
6945 | vmx_set_interrupt_shadow(vcpu, 0); | |
6946 | ||
6947 | atomic_switch_perf_msrs(vmx); | |
6948 | debugctlmsr = get_debugctlmsr(); | |
6949 | ||
6950 | vmx->__launched = vmx->loaded_vmcs->launched; | |
6951 | asm( | |
6952 | /* Store host registers */ | |
6953 | "push %%" _ASM_DX "; push %%" _ASM_BP ";" | |
6954 | "push %%" _ASM_CX " \n\t" /* placeholder for guest rcx */ | |
6955 | "push %%" _ASM_CX " \n\t" | |
6956 | "cmp %%" _ASM_SP ", %c[host_rsp](%0) \n\t" | |
6957 | "je 1f \n\t" | |
6958 | "mov %%" _ASM_SP ", %c[host_rsp](%0) \n\t" | |
6959 | __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" | |
6960 | "1: \n\t" | |
6961 | /* Reload cr2 if changed */ | |
6962 | "mov %c[cr2](%0), %%" _ASM_AX " \n\t" | |
6963 | "mov %%cr2, %%" _ASM_DX " \n\t" | |
6964 | "cmp %%" _ASM_AX ", %%" _ASM_DX " \n\t" | |
6965 | "je 2f \n\t" | |
6966 | "mov %%" _ASM_AX", %%cr2 \n\t" | |
6967 | "2: \n\t" | |
6968 | /* Check if vmlaunch of vmresume is needed */ | |
6969 | "cmpl $0, %c[launched](%0) \n\t" | |
6970 | /* Load guest registers. Don't clobber flags. */ | |
6971 | "mov %c[rax](%0), %%" _ASM_AX " \n\t" | |
6972 | "mov %c[rbx](%0), %%" _ASM_BX " \n\t" | |
6973 | "mov %c[rdx](%0), %%" _ASM_DX " \n\t" | |
6974 | "mov %c[rsi](%0), %%" _ASM_SI " \n\t" | |
6975 | "mov %c[rdi](%0), %%" _ASM_DI " \n\t" | |
6976 | "mov %c[rbp](%0), %%" _ASM_BP " \n\t" | |
6977 | #ifdef CONFIG_X86_64 | |
6978 | "mov %c[r8](%0), %%r8 \n\t" | |
6979 | "mov %c[r9](%0), %%r9 \n\t" | |
6980 | "mov %c[r10](%0), %%r10 \n\t" | |
6981 | "mov %c[r11](%0), %%r11 \n\t" | |
6982 | "mov %c[r12](%0), %%r12 \n\t" | |
6983 | "mov %c[r13](%0), %%r13 \n\t" | |
6984 | "mov %c[r14](%0), %%r14 \n\t" | |
6985 | "mov %c[r15](%0), %%r15 \n\t" | |
6986 | #endif | |
6987 | "mov %c[rcx](%0), %%" _ASM_CX " \n\t" /* kills %0 (ecx) */ | |
6988 | ||
6989 | /* Enter guest mode */ | |
6990 | "jne 1f \n\t" | |
6991 | __ex(ASM_VMX_VMLAUNCH) "\n\t" | |
6992 | "jmp 2f \n\t" | |
6993 | "1: " __ex(ASM_VMX_VMRESUME) "\n\t" | |
6994 | "2: " | |
6995 | /* Save guest registers, load host registers, keep flags */ | |
6996 | "mov %0, %c[wordsize](%%" _ASM_SP ") \n\t" | |
6997 | "pop %0 \n\t" | |
6998 | "mov %%" _ASM_AX ", %c[rax](%0) \n\t" | |
6999 | "mov %%" _ASM_BX ", %c[rbx](%0) \n\t" | |
7000 | __ASM_SIZE(pop) " %c[rcx](%0) \n\t" | |
7001 | "mov %%" _ASM_DX ", %c[rdx](%0) \n\t" | |
7002 | "mov %%" _ASM_SI ", %c[rsi](%0) \n\t" | |
7003 | "mov %%" _ASM_DI ", %c[rdi](%0) \n\t" | |
7004 | "mov %%" _ASM_BP ", %c[rbp](%0) \n\t" | |
7005 | #ifdef CONFIG_X86_64 | |
7006 | "mov %%r8, %c[r8](%0) \n\t" | |
7007 | "mov %%r9, %c[r9](%0) \n\t" | |
7008 | "mov %%r10, %c[r10](%0) \n\t" | |
7009 | "mov %%r11, %c[r11](%0) \n\t" | |
7010 | "mov %%r12, %c[r12](%0) \n\t" | |
7011 | "mov %%r13, %c[r13](%0) \n\t" | |
7012 | "mov %%r14, %c[r14](%0) \n\t" | |
7013 | "mov %%r15, %c[r15](%0) \n\t" | |
7014 | #endif | |
7015 | "mov %%cr2, %%" _ASM_AX " \n\t" | |
7016 | "mov %%" _ASM_AX ", %c[cr2](%0) \n\t" | |
7017 | ||
7018 | "pop %%" _ASM_BP "; pop %%" _ASM_DX " \n\t" | |
7019 | "setbe %c[fail](%0) \n\t" | |
7020 | ".pushsection .rodata \n\t" | |
7021 | ".global vmx_return \n\t" | |
7022 | "vmx_return: " _ASM_PTR " 2b \n\t" | |
7023 | ".popsection" | |
7024 | : : "c"(vmx), "d"((unsigned long)HOST_RSP), | |
7025 | [launched]"i"(offsetof(struct vcpu_vmx, __launched)), | |
7026 | [fail]"i"(offsetof(struct vcpu_vmx, fail)), | |
7027 | [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)), | |
7028 | [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])), | |
7029 | [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])), | |
7030 | [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])), | |
7031 | [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])), | |
7032 | [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])), | |
7033 | [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])), | |
7034 | [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])), | |
7035 | #ifdef CONFIG_X86_64 | |
7036 | [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])), | |
7037 | [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])), | |
7038 | [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])), | |
7039 | [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])), | |
7040 | [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])), | |
7041 | [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])), | |
7042 | [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])), | |
7043 | [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])), | |
7044 | #endif | |
7045 | [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)), | |
7046 | [wordsize]"i"(sizeof(ulong)) | |
7047 | : "cc", "memory" | |
7048 | #ifdef CONFIG_X86_64 | |
7049 | , "rax", "rbx", "rdi", "rsi" | |
7050 | , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" | |
7051 | #else | |
7052 | , "eax", "ebx", "edi", "esi" | |
7053 | #endif | |
7054 | ); | |
7055 | ||
7056 | /* MSR_IA32_DEBUGCTLMSR is zeroed on vmexit. Restore it if needed */ | |
7057 | if (debugctlmsr) | |
7058 | update_debugctlmsr(debugctlmsr); | |
7059 | ||
7060 | #ifndef CONFIG_X86_64 | |
7061 | /* | |
7062 | * The sysexit path does not restore ds/es, so we must set them to | |
7063 | * a reasonable value ourselves. | |
7064 | * | |
7065 | * We can't defer this to vmx_load_host_state() since that function | |
7066 | * may be executed in interrupt context, which saves and restore segments | |
7067 | * around it, nullifying its effect. | |
7068 | */ | |
7069 | loadsegment(ds, __USER_DS); | |
7070 | loadsegment(es, __USER_DS); | |
7071 | #endif | |
7072 | ||
7073 | vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) | |
7074 | | (1 << VCPU_EXREG_RFLAGS) | |
7075 | | (1 << VCPU_EXREG_CPL) | |
7076 | | (1 << VCPU_EXREG_PDPTR) | |
7077 | | (1 << VCPU_EXREG_SEGMENTS) | |
7078 | | (1 << VCPU_EXREG_CR3)); | |
7079 | vcpu->arch.regs_dirty = 0; | |
7080 | ||
7081 | vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); | |
7082 | ||
7083 | vmx->loaded_vmcs->launched = 1; | |
7084 | ||
7085 | vmx->exit_reason = vmcs_read32(VM_EXIT_REASON); | |
7086 | trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX); | |
7087 | ||
7088 | vmx_complete_atomic_exit(vmx); | |
7089 | vmx_recover_nmi_blocking(vmx); | |
7090 | vmx_complete_interrupts(vmx); | |
7091 | } | |
7092 | ||
7093 | static void vmx_free_vcpu(struct kvm_vcpu *vcpu) | |
7094 | { | |
7095 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
7096 | ||
7097 | free_vpid(vmx); | |
7098 | free_nested(vmx); | |
7099 | free_loaded_vmcs(vmx->loaded_vmcs); | |
7100 | kfree(vmx->guest_msrs); | |
7101 | kvm_vcpu_uninit(vcpu); | |
7102 | kmem_cache_free(kvm_vcpu_cache, vmx); | |
7103 | } | |
7104 | ||
7105 | static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) | |
7106 | { | |
7107 | int err; | |
7108 | struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
7109 | int cpu; | |
7110 | ||
7111 | if (!vmx) | |
7112 | return ERR_PTR(-ENOMEM); | |
7113 | ||
7114 | allocate_vpid(vmx); | |
7115 | ||
7116 | err = kvm_vcpu_init(&vmx->vcpu, kvm, id); | |
7117 | if (err) | |
7118 | goto free_vcpu; | |
7119 | ||
7120 | vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
7121 | err = -ENOMEM; | |
7122 | if (!vmx->guest_msrs) { | |
7123 | goto uninit_vcpu; | |
7124 | } | |
7125 | ||
7126 | vmx->loaded_vmcs = &vmx->vmcs01; | |
7127 | vmx->loaded_vmcs->vmcs = alloc_vmcs(); | |
7128 | if (!vmx->loaded_vmcs->vmcs) | |
7129 | goto free_msrs; | |
7130 | if (!vmm_exclusive) | |
7131 | kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id()))); | |
7132 | loaded_vmcs_init(vmx->loaded_vmcs); | |
7133 | if (!vmm_exclusive) | |
7134 | kvm_cpu_vmxoff(); | |
7135 | ||
7136 | cpu = get_cpu(); | |
7137 | vmx_vcpu_load(&vmx->vcpu, cpu); | |
7138 | vmx->vcpu.cpu = cpu; | |
7139 | err = vmx_vcpu_setup(vmx); | |
7140 | vmx_vcpu_put(&vmx->vcpu); | |
7141 | put_cpu(); | |
7142 | if (err) | |
7143 | goto free_vmcs; | |
7144 | if (vm_need_virtualize_apic_accesses(kvm)) { | |
7145 | err = alloc_apic_access_page(kvm); | |
7146 | if (err) | |
7147 | goto free_vmcs; | |
7148 | } | |
7149 | ||
7150 | if (enable_ept) { | |
7151 | if (!kvm->arch.ept_identity_map_addr) | |
7152 | kvm->arch.ept_identity_map_addr = | |
7153 | VMX_EPT_IDENTITY_PAGETABLE_ADDR; | |
7154 | err = -ENOMEM; | |
7155 | if (alloc_identity_pagetable(kvm) != 0) | |
7156 | goto free_vmcs; | |
7157 | if (!init_rmode_identity_map(kvm)) | |
7158 | goto free_vmcs; | |
7159 | } | |
7160 | ||
7161 | vmx->nested.current_vmptr = -1ull; | |
7162 | vmx->nested.current_vmcs12 = NULL; | |
7163 | ||
7164 | return &vmx->vcpu; | |
7165 | ||
7166 | free_vmcs: | |
7167 | free_loaded_vmcs(vmx->loaded_vmcs); | |
7168 | free_msrs: | |
7169 | kfree(vmx->guest_msrs); | |
7170 | uninit_vcpu: | |
7171 | kvm_vcpu_uninit(&vmx->vcpu); | |
7172 | free_vcpu: | |
7173 | free_vpid(vmx); | |
7174 | kmem_cache_free(kvm_vcpu_cache, vmx); | |
7175 | return ERR_PTR(err); | |
7176 | } | |
7177 | ||
7178 | static void __init vmx_check_processor_compat(void *rtn) | |
7179 | { | |
7180 | struct vmcs_config vmcs_conf; | |
7181 | ||
7182 | *(int *)rtn = 0; | |
7183 | if (setup_vmcs_config(&vmcs_conf) < 0) | |
7184 | *(int *)rtn = -EIO; | |
7185 | if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) { | |
7186 | printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n", | |
7187 | smp_processor_id()); | |
7188 | *(int *)rtn = -EIO; | |
7189 | } | |
7190 | } | |
7191 | ||
7192 | static int get_ept_level(void) | |
7193 | { | |
7194 | return VMX_EPT_DEFAULT_GAW + 1; | |
7195 | } | |
7196 | ||
7197 | static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) | |
7198 | { | |
7199 | u64 ret; | |
7200 | ||
7201 | /* For VT-d and EPT combination | |
7202 | * 1. MMIO: always map as UC | |
7203 | * 2. EPT with VT-d: | |
7204 | * a. VT-d without snooping control feature: can't guarantee the | |
7205 | * result, try to trust guest. | |
7206 | * b. VT-d with snooping control feature: snooping control feature of | |
7207 | * VT-d engine can guarantee the cache correctness. Just set it | |
7208 | * to WB to keep consistent with host. So the same as item 3. | |
7209 | * 3. EPT without VT-d: always map as WB and set IPAT=1 to keep | |
7210 | * consistent with host MTRR | |
7211 | */ | |
7212 | if (is_mmio) | |
7213 | ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT; | |
7214 | else if (vcpu->kvm->arch.iommu_domain && | |
7215 | !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)) | |
7216 | ret = kvm_get_guest_memory_type(vcpu, gfn) << | |
7217 | VMX_EPT_MT_EPTE_SHIFT; | |
7218 | else | |
7219 | ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT) | |
7220 | | VMX_EPT_IPAT_BIT; | |
7221 | ||
7222 | return ret; | |
7223 | } | |
7224 | ||
7225 | static int vmx_get_lpage_level(void) | |
7226 | { | |
7227 | if (enable_ept && !cpu_has_vmx_ept_1g_page()) | |
7228 | return PT_DIRECTORY_LEVEL; | |
7229 | else | |
7230 | /* For shadow and EPT supported 1GB page */ | |
7231 | return PT_PDPE_LEVEL; | |
7232 | } | |
7233 | ||
7234 | static void vmx_cpuid_update(struct kvm_vcpu *vcpu) | |
7235 | { | |
7236 | struct kvm_cpuid_entry2 *best; | |
7237 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
7238 | u32 exec_control; | |
7239 | ||
7240 | vmx->rdtscp_enabled = false; | |
7241 | if (vmx_rdtscp_supported()) { | |
7242 | exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); | |
7243 | if (exec_control & SECONDARY_EXEC_RDTSCP) { | |
7244 | best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); | |
7245 | if (best && (best->edx & bit(X86_FEATURE_RDTSCP))) | |
7246 | vmx->rdtscp_enabled = true; | |
7247 | else { | |
7248 | exec_control &= ~SECONDARY_EXEC_RDTSCP; | |
7249 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, | |
7250 | exec_control); | |
7251 | } | |
7252 | } | |
7253 | } | |
7254 | ||
7255 | /* Exposing INVPCID only when PCID is exposed */ | |
7256 | best = kvm_find_cpuid_entry(vcpu, 0x7, 0); | |
7257 | if (vmx_invpcid_supported() && | |
7258 | best && (best->ebx & bit(X86_FEATURE_INVPCID)) && | |
7259 | guest_cpuid_has_pcid(vcpu)) { | |
7260 | exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); | |
7261 | exec_control |= SECONDARY_EXEC_ENABLE_INVPCID; | |
7262 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, | |
7263 | exec_control); | |
7264 | } else { | |
7265 | if (cpu_has_secondary_exec_ctrls()) { | |
7266 | exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL); | |
7267 | exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID; | |
7268 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, | |
7269 | exec_control); | |
7270 | } | |
7271 | if (best) | |
7272 | best->ebx &= ~bit(X86_FEATURE_INVPCID); | |
7273 | } | |
7274 | } | |
7275 | ||
7276 | static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry) | |
7277 | { | |
7278 | if (func == 1 && nested) | |
7279 | entry->ecx |= bit(X86_FEATURE_VMX); | |
7280 | } | |
7281 | ||
7282 | /* | |
7283 | * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested | |
7284 | * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it | |
7285 | * with L0's requirements for its guest (a.k.a. vmsc01), so we can run the L2 | |
7286 | * guest in a way that will both be appropriate to L1's requests, and our | |
7287 | * needs. In addition to modifying the active vmcs (which is vmcs02), this | |
7288 | * function also has additional necessary side-effects, like setting various | |
7289 | * vcpu->arch fields. | |
7290 | */ | |
7291 | static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) | |
7292 | { | |
7293 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
7294 | u32 exec_control; | |
7295 | ||
7296 | vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector); | |
7297 | vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector); | |
7298 | vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector); | |
7299 | vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector); | |
7300 | vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector); | |
7301 | vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector); | |
7302 | vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector); | |
7303 | vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector); | |
7304 | vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit); | |
7305 | vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit); | |
7306 | vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit); | |
7307 | vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit); | |
7308 | vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit); | |
7309 | vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit); | |
7310 | vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit); | |
7311 | vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit); | |
7312 | vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit); | |
7313 | vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit); | |
7314 | vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes); | |
7315 | vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes); | |
7316 | vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes); | |
7317 | vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes); | |
7318 | vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes); | |
7319 | vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes); | |
7320 | vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes); | |
7321 | vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes); | |
7322 | vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base); | |
7323 | vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base); | |
7324 | vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base); | |
7325 | vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base); | |
7326 | vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base); | |
7327 | vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base); | |
7328 | vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base); | |
7329 | vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base); | |
7330 | vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base); | |
7331 | vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base); | |
7332 | ||
7333 | vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl); | |
7334 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, | |
7335 | vmcs12->vm_entry_intr_info_field); | |
7336 | vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, | |
7337 | vmcs12->vm_entry_exception_error_code); | |
7338 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, | |
7339 | vmcs12->vm_entry_instruction_len); | |
7340 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, | |
7341 | vmcs12->guest_interruptibility_info); | |
7342 | vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs); | |
7343 | kvm_set_dr(vcpu, 7, vmcs12->guest_dr7); | |
7344 | vmcs_writel(GUEST_RFLAGS, vmcs12->guest_rflags); | |
7345 | vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, | |
7346 | vmcs12->guest_pending_dbg_exceptions); | |
7347 | vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp); | |
7348 | vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip); | |
7349 | ||
7350 | vmcs_write64(VMCS_LINK_POINTER, -1ull); | |
7351 | ||
7352 | vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, | |
7353 | (vmcs_config.pin_based_exec_ctrl | | |
7354 | vmcs12->pin_based_vm_exec_control)); | |
7355 | ||
7356 | if (vmcs12->pin_based_vm_exec_control & PIN_BASED_VMX_PREEMPTION_TIMER) | |
7357 | vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, | |
7358 | vmcs12->vmx_preemption_timer_value); | |
7359 | ||
7360 | /* | |
7361 | * Whether page-faults are trapped is determined by a combination of | |
7362 | * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF. | |
7363 | * If enable_ept, L0 doesn't care about page faults and we should | |
7364 | * set all of these to L1's desires. However, if !enable_ept, L0 does | |
7365 | * care about (at least some) page faults, and because it is not easy | |
7366 | * (if at all possible?) to merge L0 and L1's desires, we simply ask | |
7367 | * to exit on each and every L2 page fault. This is done by setting | |
7368 | * MASK=MATCH=0 and (see below) EB.PF=1. | |
7369 | * Note that below we don't need special code to set EB.PF beyond the | |
7370 | * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept, | |
7371 | * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when | |
7372 | * !enable_ept, EB.PF is 1, so the "or" will always be 1. | |
7373 | * | |
7374 | * A problem with this approach (when !enable_ept) is that L1 may be | |
7375 | * injected with more page faults than it asked for. This could have | |
7376 | * caused problems, but in practice existing hypervisors don't care. | |
7377 | * To fix this, we will need to emulate the PFEC checking (on the L1 | |
7378 | * page tables), using walk_addr(), when injecting PFs to L1. | |
7379 | */ | |
7380 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, | |
7381 | enable_ept ? vmcs12->page_fault_error_code_mask : 0); | |
7382 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, | |
7383 | enable_ept ? vmcs12->page_fault_error_code_match : 0); | |
7384 | ||
7385 | if (cpu_has_secondary_exec_ctrls()) { | |
7386 | u32 exec_control = vmx_secondary_exec_control(vmx); | |
7387 | if (!vmx->rdtscp_enabled) | |
7388 | exec_control &= ~SECONDARY_EXEC_RDTSCP; | |
7389 | /* Take the following fields only from vmcs12 */ | |
7390 | exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
7391 | if (nested_cpu_has(vmcs12, | |
7392 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS)) | |
7393 | exec_control |= vmcs12->secondary_vm_exec_control; | |
7394 | ||
7395 | if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) { | |
7396 | /* | |
7397 | * Translate L1 physical address to host physical | |
7398 | * address for vmcs02. Keep the page pinned, so this | |
7399 | * physical address remains valid. We keep a reference | |
7400 | * to it so we can release it later. | |
7401 | */ | |
7402 | if (vmx->nested.apic_access_page) /* shouldn't happen */ | |
7403 | nested_release_page(vmx->nested.apic_access_page); | |
7404 | vmx->nested.apic_access_page = | |
7405 | nested_get_page(vcpu, vmcs12->apic_access_addr); | |
7406 | /* | |
7407 | * If translation failed, no matter: This feature asks | |
7408 | * to exit when accessing the given address, and if it | |
7409 | * can never be accessed, this feature won't do | |
7410 | * anything anyway. | |
7411 | */ | |
7412 | if (!vmx->nested.apic_access_page) | |
7413 | exec_control &= | |
7414 | ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
7415 | else | |
7416 | vmcs_write64(APIC_ACCESS_ADDR, | |
7417 | page_to_phys(vmx->nested.apic_access_page)); | |
7418 | } | |
7419 | ||
7420 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); | |
7421 | } | |
7422 | ||
7423 | ||
7424 | /* | |
7425 | * Set host-state according to L0's settings (vmcs12 is irrelevant here) | |
7426 | * Some constant fields are set here by vmx_set_constant_host_state(). | |
7427 | * Other fields are different per CPU, and will be set later when | |
7428 | * vmx_vcpu_load() is called, and when vmx_save_host_state() is called. | |
7429 | */ | |
7430 | vmx_set_constant_host_state(vmx); | |
7431 | ||
7432 | /* | |
7433 | * HOST_RSP is normally set correctly in vmx_vcpu_run() just before | |
7434 | * entry, but only if the current (host) sp changed from the value | |
7435 | * we wrote last (vmx->host_rsp). This cache is no longer relevant | |
7436 | * if we switch vmcs, and rather than hold a separate cache per vmcs, | |
7437 | * here we just force the write to happen on entry. | |
7438 | */ | |
7439 | vmx->host_rsp = 0; | |
7440 | ||
7441 | exec_control = vmx_exec_control(vmx); /* L0's desires */ | |
7442 | exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; | |
7443 | exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; | |
7444 | exec_control &= ~CPU_BASED_TPR_SHADOW; | |
7445 | exec_control |= vmcs12->cpu_based_vm_exec_control; | |
7446 | /* | |
7447 | * Merging of IO and MSR bitmaps not currently supported. | |
7448 | * Rather, exit every time. | |
7449 | */ | |
7450 | exec_control &= ~CPU_BASED_USE_MSR_BITMAPS; | |
7451 | exec_control &= ~CPU_BASED_USE_IO_BITMAPS; | |
7452 | exec_control |= CPU_BASED_UNCOND_IO_EXITING; | |
7453 | ||
7454 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control); | |
7455 | ||
7456 | /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the | |
7457 | * bitwise-or of what L1 wants to trap for L2, and what we want to | |
7458 | * trap. Note that CR0.TS also needs updating - we do this later. | |
7459 | */ | |
7460 | update_exception_bitmap(vcpu); | |
7461 | vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask; | |
7462 | vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); | |
7463 | ||
7464 | /* Note: IA32_MODE, LOAD_IA32_EFER are modified by vmx_set_efer below */ | |
7465 | vmcs_write32(VM_EXIT_CONTROLS, | |
7466 | vmcs12->vm_exit_controls | vmcs_config.vmexit_ctrl); | |
7467 | vmcs_write32(VM_ENTRY_CONTROLS, vmcs12->vm_entry_controls | | |
7468 | (vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE)); | |
7469 | ||
7470 | if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) | |
7471 | vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat); | |
7472 | else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) | |
7473 | vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat); | |
7474 | ||
7475 | ||
7476 | set_cr4_guest_host_mask(vmx); | |
7477 | ||
7478 | if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING) | |
7479 | vmcs_write64(TSC_OFFSET, | |
7480 | vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset); | |
7481 | else | |
7482 | vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset); | |
7483 | ||
7484 | if (enable_vpid) { | |
7485 | /* | |
7486 | * Trivially support vpid by letting L2s share their parent | |
7487 | * L1's vpid. TODO: move to a more elaborate solution, giving | |
7488 | * each L2 its own vpid and exposing the vpid feature to L1. | |
7489 | */ | |
7490 | vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); | |
7491 | vmx_flush_tlb(vcpu); | |
7492 | } | |
7493 | ||
7494 | if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER) | |
7495 | vcpu->arch.efer = vmcs12->guest_ia32_efer; | |
7496 | if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) | |
7497 | vcpu->arch.efer |= (EFER_LMA | EFER_LME); | |
7498 | else | |
7499 | vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); | |
7500 | /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ | |
7501 | vmx_set_efer(vcpu, vcpu->arch.efer); | |
7502 | ||
7503 | /* | |
7504 | * This sets GUEST_CR0 to vmcs12->guest_cr0, with possibly a modified | |
7505 | * TS bit (for lazy fpu) and bits which we consider mandatory enabled. | |
7506 | * The CR0_READ_SHADOW is what L2 should have expected to read given | |
7507 | * the specifications by L1; It's not enough to take | |
7508 | * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we | |
7509 | * have more bits than L1 expected. | |
7510 | */ | |
7511 | vmx_set_cr0(vcpu, vmcs12->guest_cr0); | |
7512 | vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12)); | |
7513 | ||
7514 | vmx_set_cr4(vcpu, vmcs12->guest_cr4); | |
7515 | vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12)); | |
7516 | ||
7517 | /* shadow page tables on either EPT or shadow page tables */ | |
7518 | kvm_set_cr3(vcpu, vmcs12->guest_cr3); | |
7519 | kvm_mmu_reset_context(vcpu); | |
7520 | ||
7521 | kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp); | |
7522 | kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip); | |
7523 | } | |
7524 | ||
7525 | /* | |
7526 | * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1 | |
7527 | * for running an L2 nested guest. | |
7528 | */ | |
7529 | static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) | |
7530 | { | |
7531 | struct vmcs12 *vmcs12; | |
7532 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
7533 | int cpu; | |
7534 | struct loaded_vmcs *vmcs02; | |
7535 | ||
7536 | if (!nested_vmx_check_permission(vcpu) || | |
7537 | !nested_vmx_check_vmcs12(vcpu)) | |
7538 | return 1; | |
7539 | ||
7540 | skip_emulated_instruction(vcpu); | |
7541 | vmcs12 = get_vmcs12(vcpu); | |
7542 | ||
7543 | if (enable_shadow_vmcs) | |
7544 | copy_shadow_to_vmcs12(vmx); | |
7545 | ||
7546 | /* | |
7547 | * The nested entry process starts with enforcing various prerequisites | |
7548 | * on vmcs12 as required by the Intel SDM, and act appropriately when | |
7549 | * they fail: As the SDM explains, some conditions should cause the | |
7550 | * instruction to fail, while others will cause the instruction to seem | |
7551 | * to succeed, but return an EXIT_REASON_INVALID_STATE. | |
7552 | * To speed up the normal (success) code path, we should avoid checking | |
7553 | * for misconfigurations which will anyway be caught by the processor | |
7554 | * when using the merged vmcs02. | |
7555 | */ | |
7556 | if (vmcs12->launch_state == launch) { | |
7557 | nested_vmx_failValid(vcpu, | |
7558 | launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS | |
7559 | : VMXERR_VMRESUME_NONLAUNCHED_VMCS); | |
7560 | return 1; | |
7561 | } | |
7562 | ||
7563 | if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE) { | |
7564 | nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); | |
7565 | return 1; | |
7566 | } | |
7567 | ||
7568 | if ((vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_MSR_BITMAPS) && | |
7569 | !IS_ALIGNED(vmcs12->msr_bitmap, PAGE_SIZE)) { | |
7570 | /*TODO: Also verify bits beyond physical address width are 0*/ | |
7571 | nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); | |
7572 | return 1; | |
7573 | } | |
7574 | ||
7575 | if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) && | |
7576 | !IS_ALIGNED(vmcs12->apic_access_addr, PAGE_SIZE)) { | |
7577 | /*TODO: Also verify bits beyond physical address width are 0*/ | |
7578 | nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); | |
7579 | return 1; | |
7580 | } | |
7581 | ||
7582 | if (vmcs12->vm_entry_msr_load_count > 0 || | |
7583 | vmcs12->vm_exit_msr_load_count > 0 || | |
7584 | vmcs12->vm_exit_msr_store_count > 0) { | |
7585 | pr_warn_ratelimited("%s: VMCS MSR_{LOAD,STORE} unsupported\n", | |
7586 | __func__); | |
7587 | nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); | |
7588 | return 1; | |
7589 | } | |
7590 | ||
7591 | if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control, | |
7592 | nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high) || | |
7593 | !vmx_control_verify(vmcs12->secondary_vm_exec_control, | |
7594 | nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high) || | |
7595 | !vmx_control_verify(vmcs12->pin_based_vm_exec_control, | |
7596 | nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high) || | |
7597 | !vmx_control_verify(vmcs12->vm_exit_controls, | |
7598 | nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high) || | |
7599 | !vmx_control_verify(vmcs12->vm_entry_controls, | |
7600 | nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high)) | |
7601 | { | |
7602 | nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD); | |
7603 | return 1; | |
7604 | } | |
7605 | ||
7606 | if (((vmcs12->host_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) || | |
7607 | ((vmcs12->host_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) { | |
7608 | nested_vmx_failValid(vcpu, | |
7609 | VMXERR_ENTRY_INVALID_HOST_STATE_FIELD); | |
7610 | return 1; | |
7611 | } | |
7612 | ||
7613 | if (((vmcs12->guest_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) || | |
7614 | ((vmcs12->guest_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) { | |
7615 | nested_vmx_entry_failure(vcpu, vmcs12, | |
7616 | EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT); | |
7617 | return 1; | |
7618 | } | |
7619 | if (vmcs12->vmcs_link_pointer != -1ull) { | |
7620 | nested_vmx_entry_failure(vcpu, vmcs12, | |
7621 | EXIT_REASON_INVALID_STATE, ENTRY_FAIL_VMCS_LINK_PTR); | |
7622 | return 1; | |
7623 | } | |
7624 | ||
7625 | /* | |
7626 | * We're finally done with prerequisite checking, and can start with | |
7627 | * the nested entry. | |
7628 | */ | |
7629 | ||
7630 | vmcs02 = nested_get_current_vmcs02(vmx); | |
7631 | if (!vmcs02) | |
7632 | return -ENOMEM; | |
7633 | ||
7634 | enter_guest_mode(vcpu); | |
7635 | ||
7636 | vmx->nested.vmcs01_tsc_offset = vmcs_read64(TSC_OFFSET); | |
7637 | ||
7638 | cpu = get_cpu(); | |
7639 | vmx->loaded_vmcs = vmcs02; | |
7640 | vmx_vcpu_put(vcpu); | |
7641 | vmx_vcpu_load(vcpu, cpu); | |
7642 | vcpu->cpu = cpu; | |
7643 | put_cpu(); | |
7644 | ||
7645 | vmx_segment_cache_clear(vmx); | |
7646 | ||
7647 | vmcs12->launch_state = 1; | |
7648 | ||
7649 | prepare_vmcs02(vcpu, vmcs12); | |
7650 | ||
7651 | /* | |
7652 | * Note no nested_vmx_succeed or nested_vmx_fail here. At this point | |
7653 | * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet | |
7654 | * returned as far as L1 is concerned. It will only return (and set | |
7655 | * the success flag) when L2 exits (see nested_vmx_vmexit()). | |
7656 | */ | |
7657 | return 1; | |
7658 | } | |
7659 | ||
7660 | /* | |
7661 | * On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date | |
7662 | * because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK). | |
7663 | * This function returns the new value we should put in vmcs12.guest_cr0. | |
7664 | * It's not enough to just return the vmcs02 GUEST_CR0. Rather, | |
7665 | * 1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now | |
7666 | * available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0 | |
7667 | * didn't trap the bit, because if L1 did, so would L0). | |
7668 | * 2. Bits that L1 asked to trap (and therefore L0 also did) could not have | |
7669 | * been modified by L2, and L1 knows it. So just leave the old value of | |
7670 | * the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0 | |
7671 | * isn't relevant, because if L0 traps this bit it can set it to anything. | |
7672 | * 3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have | |
7673 | * changed these bits, and therefore they need to be updated, but L0 | |
7674 | * didn't necessarily allow them to be changed in GUEST_CR0 - and rather | |
7675 | * put them in vmcs02 CR0_READ_SHADOW. So take these bits from there. | |
7676 | */ | |
7677 | static inline unsigned long | |
7678 | vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) | |
7679 | { | |
7680 | return | |
7681 | /*1*/ (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) | | |
7682 | /*2*/ (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) | | |
7683 | /*3*/ (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask | | |
7684 | vcpu->arch.cr0_guest_owned_bits)); | |
7685 | } | |
7686 | ||
7687 | static inline unsigned long | |
7688 | vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) | |
7689 | { | |
7690 | return | |
7691 | /*1*/ (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) | | |
7692 | /*2*/ (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) | | |
7693 | /*3*/ (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask | | |
7694 | vcpu->arch.cr4_guest_owned_bits)); | |
7695 | } | |
7696 | ||
7697 | static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu, | |
7698 | struct vmcs12 *vmcs12) | |
7699 | { | |
7700 | u32 idt_vectoring; | |
7701 | unsigned int nr; | |
7702 | ||
7703 | if (vcpu->arch.exception.pending) { | |
7704 | nr = vcpu->arch.exception.nr; | |
7705 | idt_vectoring = nr | VECTORING_INFO_VALID_MASK; | |
7706 | ||
7707 | if (kvm_exception_is_soft(nr)) { | |
7708 | vmcs12->vm_exit_instruction_len = | |
7709 | vcpu->arch.event_exit_inst_len; | |
7710 | idt_vectoring |= INTR_TYPE_SOFT_EXCEPTION; | |
7711 | } else | |
7712 | idt_vectoring |= INTR_TYPE_HARD_EXCEPTION; | |
7713 | ||
7714 | if (vcpu->arch.exception.has_error_code) { | |
7715 | idt_vectoring |= VECTORING_INFO_DELIVER_CODE_MASK; | |
7716 | vmcs12->idt_vectoring_error_code = | |
7717 | vcpu->arch.exception.error_code; | |
7718 | } | |
7719 | ||
7720 | vmcs12->idt_vectoring_info_field = idt_vectoring; | |
7721 | } else if (vcpu->arch.nmi_pending) { | |
7722 | vmcs12->idt_vectoring_info_field = | |
7723 | INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR; | |
7724 | } else if (vcpu->arch.interrupt.pending) { | |
7725 | nr = vcpu->arch.interrupt.nr; | |
7726 | idt_vectoring = nr | VECTORING_INFO_VALID_MASK; | |
7727 | ||
7728 | if (vcpu->arch.interrupt.soft) { | |
7729 | idt_vectoring |= INTR_TYPE_SOFT_INTR; | |
7730 | vmcs12->vm_entry_instruction_len = | |
7731 | vcpu->arch.event_exit_inst_len; | |
7732 | } else | |
7733 | idt_vectoring |= INTR_TYPE_EXT_INTR; | |
7734 | ||
7735 | vmcs12->idt_vectoring_info_field = idt_vectoring; | |
7736 | } | |
7737 | } | |
7738 | ||
7739 | /* | |
7740 | * prepare_vmcs12 is part of what we need to do when the nested L2 guest exits | |
7741 | * and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12), | |
7742 | * and this function updates it to reflect the changes to the guest state while | |
7743 | * L2 was running (and perhaps made some exits which were handled directly by L0 | |
7744 | * without going back to L1), and to reflect the exit reason. | |
7745 | * Note that we do not have to copy here all VMCS fields, just those that | |
7746 | * could have changed by the L2 guest or the exit - i.e., the guest-state and | |
7747 | * exit-information fields only. Other fields are modified by L1 with VMWRITE, | |
7748 | * which already writes to vmcs12 directly. | |
7749 | */ | |
7750 | static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) | |
7751 | { | |
7752 | /* update guest state fields: */ | |
7753 | vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12); | |
7754 | vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12); | |
7755 | ||
7756 | kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7); | |
7757 | vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); | |
7758 | vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP); | |
7759 | vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS); | |
7760 | ||
7761 | vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR); | |
7762 | vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR); | |
7763 | vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR); | |
7764 | vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR); | |
7765 | vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR); | |
7766 | vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR); | |
7767 | vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR); | |
7768 | vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR); | |
7769 | vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT); | |
7770 | vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT); | |
7771 | vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT); | |
7772 | vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT); | |
7773 | vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT); | |
7774 | vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT); | |
7775 | vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT); | |
7776 | vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT); | |
7777 | vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT); | |
7778 | vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT); | |
7779 | vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES); | |
7780 | vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES); | |
7781 | vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES); | |
7782 | vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES); | |
7783 | vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES); | |
7784 | vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES); | |
7785 | vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES); | |
7786 | vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES); | |
7787 | vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE); | |
7788 | vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE); | |
7789 | vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE); | |
7790 | vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE); | |
7791 | vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE); | |
7792 | vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE); | |
7793 | vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE); | |
7794 | vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE); | |
7795 | vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE); | |
7796 | vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE); | |
7797 | ||
7798 | vmcs12->guest_interruptibility_info = | |
7799 | vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); | |
7800 | vmcs12->guest_pending_dbg_exceptions = | |
7801 | vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS); | |
7802 | ||
7803 | vmcs12->vm_entry_controls = | |
7804 | (vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) | | |
7805 | (vmcs_read32(VM_ENTRY_CONTROLS) & VM_ENTRY_IA32E_MODE); | |
7806 | ||
7807 | /* TODO: These cannot have changed unless we have MSR bitmaps and | |
7808 | * the relevant bit asks not to trap the change */ | |
7809 | vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL); | |
7810 | if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT) | |
7811 | vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT); | |
7812 | vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS); | |
7813 | vmcs12->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP); | |
7814 | vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP); | |
7815 | ||
7816 | /* update exit information fields: */ | |
7817 | ||
7818 | vmcs12->vm_exit_reason = to_vmx(vcpu)->exit_reason; | |
7819 | vmcs12->exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
7820 | ||
7821 | vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
7822 | if ((vmcs12->vm_exit_intr_info & | |
7823 | (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) == | |
7824 | (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) | |
7825 | vmcs12->vm_exit_intr_error_code = | |
7826 | vmcs_read32(VM_EXIT_INTR_ERROR_CODE); | |
7827 | vmcs12->idt_vectoring_info_field = 0; | |
7828 | vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
7829 | vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); | |
7830 | ||
7831 | if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) { | |
7832 | /* vm_entry_intr_info_field is cleared on exit. Emulate this | |
7833 | * instead of reading the real value. */ | |
7834 | vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK; | |
7835 | ||
7836 | /* | |
7837 | * Transfer the event that L0 or L1 may wanted to inject into | |
7838 | * L2 to IDT_VECTORING_INFO_FIELD. | |
7839 | */ | |
7840 | vmcs12_save_pending_event(vcpu, vmcs12); | |
7841 | } | |
7842 | ||
7843 | /* | |
7844 | * Drop what we picked up for L2 via vmx_complete_interrupts. It is | |
7845 | * preserved above and would only end up incorrectly in L1. | |
7846 | */ | |
7847 | vcpu->arch.nmi_injected = false; | |
7848 | kvm_clear_exception_queue(vcpu); | |
7849 | kvm_clear_interrupt_queue(vcpu); | |
7850 | } | |
7851 | ||
7852 | /* | |
7853 | * A part of what we need to when the nested L2 guest exits and we want to | |
7854 | * run its L1 parent, is to reset L1's guest state to the host state specified | |
7855 | * in vmcs12. | |
7856 | * This function is to be called not only on normal nested exit, but also on | |
7857 | * a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry | |
7858 | * Failures During or After Loading Guest State"). | |
7859 | * This function should be called when the active VMCS is L1's (vmcs01). | |
7860 | */ | |
7861 | static void load_vmcs12_host_state(struct kvm_vcpu *vcpu, | |
7862 | struct vmcs12 *vmcs12) | |
7863 | { | |
7864 | if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) | |
7865 | vcpu->arch.efer = vmcs12->host_ia32_efer; | |
7866 | if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) | |
7867 | vcpu->arch.efer |= (EFER_LMA | EFER_LME); | |
7868 | else | |
7869 | vcpu->arch.efer &= ~(EFER_LMA | EFER_LME); | |
7870 | vmx_set_efer(vcpu, vcpu->arch.efer); | |
7871 | ||
7872 | kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp); | |
7873 | kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip); | |
7874 | vmx_set_rflags(vcpu, X86_EFLAGS_BIT1); | |
7875 | /* | |
7876 | * Note that calling vmx_set_cr0 is important, even if cr0 hasn't | |
7877 | * actually changed, because it depends on the current state of | |
7878 | * fpu_active (which may have changed). | |
7879 | * Note that vmx_set_cr0 refers to efer set above. | |
7880 | */ | |
7881 | kvm_set_cr0(vcpu, vmcs12->host_cr0); | |
7882 | /* | |
7883 | * If we did fpu_activate()/fpu_deactivate() during L2's run, we need | |
7884 | * to apply the same changes to L1's vmcs. We just set cr0 correctly, | |
7885 | * but we also need to update cr0_guest_host_mask and exception_bitmap. | |
7886 | */ | |
7887 | update_exception_bitmap(vcpu); | |
7888 | vcpu->arch.cr0_guest_owned_bits = (vcpu->fpu_active ? X86_CR0_TS : 0); | |
7889 | vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits); | |
7890 | ||
7891 | /* | |
7892 | * Note that CR4_GUEST_HOST_MASK is already set in the original vmcs01 | |
7893 | * (KVM doesn't change it)- no reason to call set_cr4_guest_host_mask(); | |
7894 | */ | |
7895 | vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK); | |
7896 | kvm_set_cr4(vcpu, vmcs12->host_cr4); | |
7897 | ||
7898 | /* shadow page tables on either EPT or shadow page tables */ | |
7899 | kvm_set_cr3(vcpu, vmcs12->host_cr3); | |
7900 | kvm_mmu_reset_context(vcpu); | |
7901 | ||
7902 | if (enable_vpid) { | |
7903 | /* | |
7904 | * Trivially support vpid by letting L2s share their parent | |
7905 | * L1's vpid. TODO: move to a more elaborate solution, giving | |
7906 | * each L2 its own vpid and exposing the vpid feature to L1. | |
7907 | */ | |
7908 | vmx_flush_tlb(vcpu); | |
7909 | } | |
7910 | ||
7911 | ||
7912 | vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs); | |
7913 | vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp); | |
7914 | vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip); | |
7915 | vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base); | |
7916 | vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base); | |
7917 | vmcs_writel(GUEST_TR_BASE, vmcs12->host_tr_base); | |
7918 | vmcs_writel(GUEST_GS_BASE, vmcs12->host_gs_base); | |
7919 | vmcs_writel(GUEST_FS_BASE, vmcs12->host_fs_base); | |
7920 | vmcs_write16(GUEST_ES_SELECTOR, vmcs12->host_es_selector); | |
7921 | vmcs_write16(GUEST_CS_SELECTOR, vmcs12->host_cs_selector); | |
7922 | vmcs_write16(GUEST_SS_SELECTOR, vmcs12->host_ss_selector); | |
7923 | vmcs_write16(GUEST_DS_SELECTOR, vmcs12->host_ds_selector); | |
7924 | vmcs_write16(GUEST_FS_SELECTOR, vmcs12->host_fs_selector); | |
7925 | vmcs_write16(GUEST_GS_SELECTOR, vmcs12->host_gs_selector); | |
7926 | vmcs_write16(GUEST_TR_SELECTOR, vmcs12->host_tr_selector); | |
7927 | ||
7928 | if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) | |
7929 | vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat); | |
7930 | if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) | |
7931 | vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL, | |
7932 | vmcs12->host_ia32_perf_global_ctrl); | |
7933 | ||
7934 | kvm_set_dr(vcpu, 7, 0x400); | |
7935 | vmcs_write64(GUEST_IA32_DEBUGCTL, 0); | |
7936 | } | |
7937 | ||
7938 | /* | |
7939 | * Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1 | |
7940 | * and modify vmcs12 to make it see what it would expect to see there if | |
7941 | * L2 was its real guest. Must only be called when in L2 (is_guest_mode()) | |
7942 | */ | |
7943 | static void nested_vmx_vmexit(struct kvm_vcpu *vcpu) | |
7944 | { | |
7945 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
7946 | int cpu; | |
7947 | struct vmcs12 *vmcs12 = get_vmcs12(vcpu); | |
7948 | ||
7949 | /* trying to cancel vmlaunch/vmresume is a bug */ | |
7950 | WARN_ON_ONCE(vmx->nested.nested_run_pending); | |
7951 | ||
7952 | leave_guest_mode(vcpu); | |
7953 | prepare_vmcs12(vcpu, vmcs12); | |
7954 | ||
7955 | cpu = get_cpu(); | |
7956 | vmx->loaded_vmcs = &vmx->vmcs01; | |
7957 | vmx_vcpu_put(vcpu); | |
7958 | vmx_vcpu_load(vcpu, cpu); | |
7959 | vcpu->cpu = cpu; | |
7960 | put_cpu(); | |
7961 | ||
7962 | vmx_segment_cache_clear(vmx); | |
7963 | ||
7964 | /* if no vmcs02 cache requested, remove the one we used */ | |
7965 | if (VMCS02_POOL_SIZE == 0) | |
7966 | nested_free_vmcs02(vmx, vmx->nested.current_vmptr); | |
7967 | ||
7968 | load_vmcs12_host_state(vcpu, vmcs12); | |
7969 | ||
7970 | /* Update TSC_OFFSET if TSC was changed while L2 ran */ | |
7971 | vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset); | |
7972 | ||
7973 | /* This is needed for same reason as it was needed in prepare_vmcs02 */ | |
7974 | vmx->host_rsp = 0; | |
7975 | ||
7976 | /* Unpin physical memory we referred to in vmcs02 */ | |
7977 | if (vmx->nested.apic_access_page) { | |
7978 | nested_release_page(vmx->nested.apic_access_page); | |
7979 | vmx->nested.apic_access_page = 0; | |
7980 | } | |
7981 | ||
7982 | /* | |
7983 | * Exiting from L2 to L1, we're now back to L1 which thinks it just | |
7984 | * finished a VMLAUNCH or VMRESUME instruction, so we need to set the | |
7985 | * success or failure flag accordingly. | |
7986 | */ | |
7987 | if (unlikely(vmx->fail)) { | |
7988 | vmx->fail = 0; | |
7989 | nested_vmx_failValid(vcpu, vmcs_read32(VM_INSTRUCTION_ERROR)); | |
7990 | } else | |
7991 | nested_vmx_succeed(vcpu); | |
7992 | if (enable_shadow_vmcs) | |
7993 | vmx->nested.sync_shadow_vmcs = true; | |
7994 | } | |
7995 | ||
7996 | /* | |
7997 | * L1's failure to enter L2 is a subset of a normal exit, as explained in | |
7998 | * 23.7 "VM-entry failures during or after loading guest state" (this also | |
7999 | * lists the acceptable exit-reason and exit-qualification parameters). | |
8000 | * It should only be called before L2 actually succeeded to run, and when | |
8001 | * vmcs01 is current (it doesn't leave_guest_mode() or switch vmcss). | |
8002 | */ | |
8003 | static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu, | |
8004 | struct vmcs12 *vmcs12, | |
8005 | u32 reason, unsigned long qualification) | |
8006 | { | |
8007 | load_vmcs12_host_state(vcpu, vmcs12); | |
8008 | vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY; | |
8009 | vmcs12->exit_qualification = qualification; | |
8010 | nested_vmx_succeed(vcpu); | |
8011 | if (enable_shadow_vmcs) | |
8012 | to_vmx(vcpu)->nested.sync_shadow_vmcs = true; | |
8013 | } | |
8014 | ||
8015 | static int vmx_check_intercept(struct kvm_vcpu *vcpu, | |
8016 | struct x86_instruction_info *info, | |
8017 | enum x86_intercept_stage stage) | |
8018 | { | |
8019 | return X86EMUL_CONTINUE; | |
8020 | } | |
8021 | ||
8022 | static struct kvm_x86_ops vmx_x86_ops = { | |
8023 | .cpu_has_kvm_support = cpu_has_kvm_support, | |
8024 | .disabled_by_bios = vmx_disabled_by_bios, | |
8025 | .hardware_setup = hardware_setup, | |
8026 | .hardware_unsetup = hardware_unsetup, | |
8027 | .check_processor_compatibility = vmx_check_processor_compat, | |
8028 | .hardware_enable = hardware_enable, | |
8029 | .hardware_disable = hardware_disable, | |
8030 | .cpu_has_accelerated_tpr = report_flexpriority, | |
8031 | ||
8032 | .vcpu_create = vmx_create_vcpu, | |
8033 | .vcpu_free = vmx_free_vcpu, | |
8034 | .vcpu_reset = vmx_vcpu_reset, | |
8035 | ||
8036 | .prepare_guest_switch = vmx_save_host_state, | |
8037 | .vcpu_load = vmx_vcpu_load, | |
8038 | .vcpu_put = vmx_vcpu_put, | |
8039 | ||
8040 | .update_db_bp_intercept = update_exception_bitmap, | |
8041 | .get_msr = vmx_get_msr, | |
8042 | .set_msr = vmx_set_msr, | |
8043 | .get_segment_base = vmx_get_segment_base, | |
8044 | .get_segment = vmx_get_segment, | |
8045 | .set_segment = vmx_set_segment, | |
8046 | .get_cpl = vmx_get_cpl, | |
8047 | .get_cs_db_l_bits = vmx_get_cs_db_l_bits, | |
8048 | .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits, | |
8049 | .decache_cr3 = vmx_decache_cr3, | |
8050 | .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, | |
8051 | .set_cr0 = vmx_set_cr0, | |
8052 | .set_cr3 = vmx_set_cr3, | |
8053 | .set_cr4 = vmx_set_cr4, | |
8054 | .set_efer = vmx_set_efer, | |
8055 | .get_idt = vmx_get_idt, | |
8056 | .set_idt = vmx_set_idt, | |
8057 | .get_gdt = vmx_get_gdt, | |
8058 | .set_gdt = vmx_set_gdt, | |
8059 | .set_dr7 = vmx_set_dr7, | |
8060 | .cache_reg = vmx_cache_reg, | |
8061 | .get_rflags = vmx_get_rflags, | |
8062 | .set_rflags = vmx_set_rflags, | |
8063 | .fpu_activate = vmx_fpu_activate, | |
8064 | .fpu_deactivate = vmx_fpu_deactivate, | |
8065 | ||
8066 | .tlb_flush = vmx_flush_tlb, | |
8067 | ||
8068 | .run = vmx_vcpu_run, | |
8069 | .handle_exit = vmx_handle_exit, | |
8070 | .skip_emulated_instruction = skip_emulated_instruction, | |
8071 | .set_interrupt_shadow = vmx_set_interrupt_shadow, | |
8072 | .get_interrupt_shadow = vmx_get_interrupt_shadow, | |
8073 | .patch_hypercall = vmx_patch_hypercall, | |
8074 | .set_irq = vmx_inject_irq, | |
8075 | .set_nmi = vmx_inject_nmi, | |
8076 | .queue_exception = vmx_queue_exception, | |
8077 | .cancel_injection = vmx_cancel_injection, | |
8078 | .interrupt_allowed = vmx_interrupt_allowed, | |
8079 | .nmi_allowed = vmx_nmi_allowed, | |
8080 | .get_nmi_mask = vmx_get_nmi_mask, | |
8081 | .set_nmi_mask = vmx_set_nmi_mask, | |
8082 | .enable_nmi_window = enable_nmi_window, | |
8083 | .enable_irq_window = enable_irq_window, | |
8084 | .update_cr8_intercept = update_cr8_intercept, | |
8085 | .set_virtual_x2apic_mode = vmx_set_virtual_x2apic_mode, | |
8086 | .vm_has_apicv = vmx_vm_has_apicv, | |
8087 | .load_eoi_exitmap = vmx_load_eoi_exitmap, | |
8088 | .hwapic_irr_update = vmx_hwapic_irr_update, | |
8089 | .hwapic_isr_update = vmx_hwapic_isr_update, | |
8090 | .sync_pir_to_irr = vmx_sync_pir_to_irr, | |
8091 | .deliver_posted_interrupt = vmx_deliver_posted_interrupt, | |
8092 | ||
8093 | .set_tss_addr = vmx_set_tss_addr, | |
8094 | .get_tdp_level = get_ept_level, | |
8095 | .get_mt_mask = vmx_get_mt_mask, | |
8096 | ||
8097 | .get_exit_info = vmx_get_exit_info, | |
8098 | ||
8099 | .get_lpage_level = vmx_get_lpage_level, | |
8100 | ||
8101 | .cpuid_update = vmx_cpuid_update, | |
8102 | ||
8103 | .rdtscp_supported = vmx_rdtscp_supported, | |
8104 | .invpcid_supported = vmx_invpcid_supported, | |
8105 | ||
8106 | .set_supported_cpuid = vmx_set_supported_cpuid, | |
8107 | ||
8108 | .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit, | |
8109 | ||
8110 | .set_tsc_khz = vmx_set_tsc_khz, | |
8111 | .read_tsc_offset = vmx_read_tsc_offset, | |
8112 | .write_tsc_offset = vmx_write_tsc_offset, | |
8113 | .adjust_tsc_offset = vmx_adjust_tsc_offset, | |
8114 | .compute_tsc_offset = vmx_compute_tsc_offset, | |
8115 | .read_l1_tsc = vmx_read_l1_tsc, | |
8116 | ||
8117 | .set_tdp_cr3 = vmx_set_cr3, | |
8118 | ||
8119 | .check_intercept = vmx_check_intercept, | |
8120 | .handle_external_intr = vmx_handle_external_intr, | |
8121 | }; | |
8122 | ||
8123 | static int __init vmx_init(void) | |
8124 | { | |
8125 | int r, i, msr; | |
8126 | ||
8127 | rdmsrl_safe(MSR_EFER, &host_efer); | |
8128 | ||
8129 | for (i = 0; i < NR_VMX_MSR; ++i) | |
8130 | kvm_define_shared_msr(i, vmx_msr_index[i]); | |
8131 | ||
8132 | vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL); | |
8133 | if (!vmx_io_bitmap_a) | |
8134 | return -ENOMEM; | |
8135 | ||
8136 | r = -ENOMEM; | |
8137 | ||
8138 | vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL); | |
8139 | if (!vmx_io_bitmap_b) | |
8140 | goto out; | |
8141 | ||
8142 | vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL); | |
8143 | if (!vmx_msr_bitmap_legacy) | |
8144 | goto out1; | |
8145 | ||
8146 | vmx_msr_bitmap_legacy_x2apic = | |
8147 | (unsigned long *)__get_free_page(GFP_KERNEL); | |
8148 | if (!vmx_msr_bitmap_legacy_x2apic) | |
8149 | goto out2; | |
8150 | ||
8151 | vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL); | |
8152 | if (!vmx_msr_bitmap_longmode) | |
8153 | goto out3; | |
8154 | ||
8155 | vmx_msr_bitmap_longmode_x2apic = | |
8156 | (unsigned long *)__get_free_page(GFP_KERNEL); | |
8157 | if (!vmx_msr_bitmap_longmode_x2apic) | |
8158 | goto out4; | |
8159 | vmx_vmread_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL); | |
8160 | if (!vmx_vmread_bitmap) | |
8161 | goto out5; | |
8162 | ||
8163 | vmx_vmwrite_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL); | |
8164 | if (!vmx_vmwrite_bitmap) | |
8165 | goto out6; | |
8166 | ||
8167 | memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE); | |
8168 | memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE); | |
8169 | /* shadowed read/write fields */ | |
8170 | for (i = 0; i < max_shadow_read_write_fields; i++) { | |
8171 | clear_bit(shadow_read_write_fields[i], vmx_vmwrite_bitmap); | |
8172 | clear_bit(shadow_read_write_fields[i], vmx_vmread_bitmap); | |
8173 | } | |
8174 | /* shadowed read only fields */ | |
8175 | for (i = 0; i < max_shadow_read_only_fields; i++) | |
8176 | clear_bit(shadow_read_only_fields[i], vmx_vmread_bitmap); | |
8177 | ||
8178 | /* | |
8179 | * Allow direct access to the PC debug port (it is often used for I/O | |
8180 | * delays, but the vmexits simply slow things down). | |
8181 | */ | |
8182 | memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE); | |
8183 | clear_bit(0x80, vmx_io_bitmap_a); | |
8184 | ||
8185 | memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE); | |
8186 | ||
8187 | memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE); | |
8188 | memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE); | |
8189 | ||
8190 | set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ | |
8191 | ||
8192 | r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), | |
8193 | __alignof__(struct vcpu_vmx), THIS_MODULE); | |
8194 | if (r) | |
8195 | goto out7; | |
8196 | ||
8197 | #ifdef CONFIG_KEXEC | |
8198 | rcu_assign_pointer(crash_vmclear_loaded_vmcss, | |
8199 | crash_vmclear_local_loaded_vmcss); | |
8200 | #endif | |
8201 | ||
8202 | vmx_disable_intercept_for_msr(MSR_FS_BASE, false); | |
8203 | vmx_disable_intercept_for_msr(MSR_GS_BASE, false); | |
8204 | vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true); | |
8205 | vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false); | |
8206 | vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false); | |
8207 | vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false); | |
8208 | memcpy(vmx_msr_bitmap_legacy_x2apic, | |
8209 | vmx_msr_bitmap_legacy, PAGE_SIZE); | |
8210 | memcpy(vmx_msr_bitmap_longmode_x2apic, | |
8211 | vmx_msr_bitmap_longmode, PAGE_SIZE); | |
8212 | ||
8213 | if (enable_apicv) { | |
8214 | for (msr = 0x800; msr <= 0x8ff; msr++) | |
8215 | vmx_disable_intercept_msr_read_x2apic(msr); | |
8216 | ||
8217 | /* According SDM, in x2apic mode, the whole id reg is used. | |
8218 | * But in KVM, it only use the highest eight bits. Need to | |
8219 | * intercept it */ | |
8220 | vmx_enable_intercept_msr_read_x2apic(0x802); | |
8221 | /* TMCCT */ | |
8222 | vmx_enable_intercept_msr_read_x2apic(0x839); | |
8223 | /* TPR */ | |
8224 | vmx_disable_intercept_msr_write_x2apic(0x808); | |
8225 | /* EOI */ | |
8226 | vmx_disable_intercept_msr_write_x2apic(0x80b); | |
8227 | /* SELF-IPI */ | |
8228 | vmx_disable_intercept_msr_write_x2apic(0x83f); | |
8229 | } | |
8230 | ||
8231 | if (enable_ept) { | |
8232 | kvm_mmu_set_mask_ptes(0ull, | |
8233 | (enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull, | |
8234 | (enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull, | |
8235 | 0ull, VMX_EPT_EXECUTABLE_MASK); | |
8236 | ept_set_mmio_spte_mask(); | |
8237 | kvm_enable_tdp(); | |
8238 | } else | |
8239 | kvm_disable_tdp(); | |
8240 | ||
8241 | return 0; | |
8242 | ||
8243 | out7: | |
8244 | free_page((unsigned long)vmx_vmwrite_bitmap); | |
8245 | out6: | |
8246 | free_page((unsigned long)vmx_vmread_bitmap); | |
8247 | out5: | |
8248 | free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic); | |
8249 | out4: | |
8250 | free_page((unsigned long)vmx_msr_bitmap_longmode); | |
8251 | out3: | |
8252 | free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic); | |
8253 | out2: | |
8254 | free_page((unsigned long)vmx_msr_bitmap_legacy); | |
8255 | out1: | |
8256 | free_page((unsigned long)vmx_io_bitmap_b); | |
8257 | out: | |
8258 | free_page((unsigned long)vmx_io_bitmap_a); | |
8259 | return r; | |
8260 | } | |
8261 | ||
8262 | static void __exit vmx_exit(void) | |
8263 | { | |
8264 | free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic); | |
8265 | free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic); | |
8266 | free_page((unsigned long)vmx_msr_bitmap_legacy); | |
8267 | free_page((unsigned long)vmx_msr_bitmap_longmode); | |
8268 | free_page((unsigned long)vmx_io_bitmap_b); | |
8269 | free_page((unsigned long)vmx_io_bitmap_a); | |
8270 | free_page((unsigned long)vmx_vmwrite_bitmap); | |
8271 | free_page((unsigned long)vmx_vmread_bitmap); | |
8272 | ||
8273 | #ifdef CONFIG_KEXEC | |
8274 | rcu_assign_pointer(crash_vmclear_loaded_vmcss, NULL); | |
8275 | synchronize_rcu(); | |
8276 | #endif | |
8277 | ||
8278 | kvm_exit(); | |
8279 | } | |
8280 | ||
8281 | module_init(vmx_init) | |
8282 | module_exit(vmx_exit) |