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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 | * | |
9 | * Authors: | |
10 | * Avi Kivity <avi@qumranet.com> | |
11 | * Yaniv Kamay <yaniv@qumranet.com> | |
12 | * | |
13 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
14 | * the COPYING file in the top-level directory. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include "irq.h" | |
19 | #include "mmu.h" | |
20 | ||
21 | #include <linux/kvm_host.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/moduleparam.h> | |
28 | #include <linux/ftrace_event.h> | |
29 | #include "kvm_cache_regs.h" | |
30 | #include "x86.h" | |
31 | ||
32 | #include <asm/io.h> | |
33 | #include <asm/desc.h> | |
34 | #include <asm/vmx.h> | |
35 | #include <asm/virtext.h> | |
36 | #include <asm/mce.h> | |
37 | ||
38 | #include "trace.h" | |
39 | ||
40 | #define __ex(x) __kvm_handle_fault_on_reboot(x) | |
41 | ||
42 | MODULE_AUTHOR("Qumranet"); | |
43 | MODULE_LICENSE("GPL"); | |
44 | ||
45 | static int __read_mostly bypass_guest_pf = 1; | |
46 | module_param(bypass_guest_pf, bool, S_IRUGO); | |
47 | ||
48 | static int __read_mostly enable_vpid = 1; | |
49 | module_param_named(vpid, enable_vpid, bool, 0444); | |
50 | ||
51 | static int __read_mostly flexpriority_enabled = 1; | |
52 | module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO); | |
53 | ||
54 | static int __read_mostly enable_ept = 1; | |
55 | module_param_named(ept, enable_ept, bool, S_IRUGO); | |
56 | ||
57 | static int __read_mostly enable_unrestricted_guest = 1; | |
58 | module_param_named(unrestricted_guest, | |
59 | enable_unrestricted_guest, bool, S_IRUGO); | |
60 | ||
61 | static int __read_mostly emulate_invalid_guest_state = 0; | |
62 | module_param(emulate_invalid_guest_state, bool, S_IRUGO); | |
63 | ||
64 | /* | |
65 | * These 2 parameters are used to config the controls for Pause-Loop Exiting: | |
66 | * ple_gap: upper bound on the amount of time between two successive | |
67 | * executions of PAUSE in a loop. Also indicate if ple enabled. | |
68 | * According to test, this time is usually small than 41 cycles. | |
69 | * ple_window: upper bound on the amount of time a guest is allowed to execute | |
70 | * in a PAUSE loop. Tests indicate that most spinlocks are held for | |
71 | * less than 2^12 cycles | |
72 | * Time is measured based on a counter that runs at the same rate as the TSC, | |
73 | * refer SDM volume 3b section 21.6.13 & 22.1.3. | |
74 | */ | |
75 | #define KVM_VMX_DEFAULT_PLE_GAP 41 | |
76 | #define KVM_VMX_DEFAULT_PLE_WINDOW 4096 | |
77 | static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP; | |
78 | module_param(ple_gap, int, S_IRUGO); | |
79 | ||
80 | static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW; | |
81 | module_param(ple_window, int, S_IRUGO); | |
82 | ||
83 | struct vmcs { | |
84 | u32 revision_id; | |
85 | u32 abort; | |
86 | char data[0]; | |
87 | }; | |
88 | ||
89 | struct shared_msr_entry { | |
90 | unsigned index; | |
91 | u64 data; | |
92 | u64 mask; | |
93 | }; | |
94 | ||
95 | struct vcpu_vmx { | |
96 | struct kvm_vcpu vcpu; | |
97 | struct list_head local_vcpus_link; | |
98 | unsigned long host_rsp; | |
99 | int launched; | |
100 | u8 fail; | |
101 | u32 idt_vectoring_info; | |
102 | struct shared_msr_entry *guest_msrs; | |
103 | int nmsrs; | |
104 | int save_nmsrs; | |
105 | #ifdef CONFIG_X86_64 | |
106 | u64 msr_host_kernel_gs_base; | |
107 | u64 msr_guest_kernel_gs_base; | |
108 | #endif | |
109 | struct vmcs *vmcs; | |
110 | struct { | |
111 | int loaded; | |
112 | u16 fs_sel, gs_sel, ldt_sel; | |
113 | int gs_ldt_reload_needed; | |
114 | int fs_reload_needed; | |
115 | } host_state; | |
116 | struct { | |
117 | int vm86_active; | |
118 | u8 save_iopl; | |
119 | struct kvm_save_segment { | |
120 | u16 selector; | |
121 | unsigned long base; | |
122 | u32 limit; | |
123 | u32 ar; | |
124 | } tr, es, ds, fs, gs; | |
125 | struct { | |
126 | bool pending; | |
127 | u8 vector; | |
128 | unsigned rip; | |
129 | } irq; | |
130 | } rmode; | |
131 | int vpid; | |
132 | bool emulation_required; | |
133 | ||
134 | /* Support for vnmi-less CPUs */ | |
135 | int soft_vnmi_blocked; | |
136 | ktime_t entry_time; | |
137 | s64 vnmi_blocked_time; | |
138 | u32 exit_reason; | |
139 | }; | |
140 | ||
141 | static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu) | |
142 | { | |
143 | return container_of(vcpu, struct vcpu_vmx, vcpu); | |
144 | } | |
145 | ||
146 | static int init_rmode(struct kvm *kvm); | |
147 | static u64 construct_eptp(unsigned long root_hpa); | |
148 | ||
149 | static DEFINE_PER_CPU(struct vmcs *, vmxarea); | |
150 | static DEFINE_PER_CPU(struct vmcs *, current_vmcs); | |
151 | static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu); | |
152 | ||
153 | static unsigned long *vmx_io_bitmap_a; | |
154 | static unsigned long *vmx_io_bitmap_b; | |
155 | static unsigned long *vmx_msr_bitmap_legacy; | |
156 | static unsigned long *vmx_msr_bitmap_longmode; | |
157 | ||
158 | static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS); | |
159 | static DEFINE_SPINLOCK(vmx_vpid_lock); | |
160 | ||
161 | static struct vmcs_config { | |
162 | int size; | |
163 | int order; | |
164 | u32 revision_id; | |
165 | u32 pin_based_exec_ctrl; | |
166 | u32 cpu_based_exec_ctrl; | |
167 | u32 cpu_based_2nd_exec_ctrl; | |
168 | u32 vmexit_ctrl; | |
169 | u32 vmentry_ctrl; | |
170 | } vmcs_config; | |
171 | ||
172 | static struct vmx_capability { | |
173 | u32 ept; | |
174 | u32 vpid; | |
175 | } vmx_capability; | |
176 | ||
177 | #define VMX_SEGMENT_FIELD(seg) \ | |
178 | [VCPU_SREG_##seg] = { \ | |
179 | .selector = GUEST_##seg##_SELECTOR, \ | |
180 | .base = GUEST_##seg##_BASE, \ | |
181 | .limit = GUEST_##seg##_LIMIT, \ | |
182 | .ar_bytes = GUEST_##seg##_AR_BYTES, \ | |
183 | } | |
184 | ||
185 | static struct kvm_vmx_segment_field { | |
186 | unsigned selector; | |
187 | unsigned base; | |
188 | unsigned limit; | |
189 | unsigned ar_bytes; | |
190 | } kvm_vmx_segment_fields[] = { | |
191 | VMX_SEGMENT_FIELD(CS), | |
192 | VMX_SEGMENT_FIELD(DS), | |
193 | VMX_SEGMENT_FIELD(ES), | |
194 | VMX_SEGMENT_FIELD(FS), | |
195 | VMX_SEGMENT_FIELD(GS), | |
196 | VMX_SEGMENT_FIELD(SS), | |
197 | VMX_SEGMENT_FIELD(TR), | |
198 | VMX_SEGMENT_FIELD(LDTR), | |
199 | }; | |
200 | ||
201 | static u64 host_efer; | |
202 | ||
203 | static void ept_save_pdptrs(struct kvm_vcpu *vcpu); | |
204 | ||
205 | /* | |
206 | * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it | |
207 | * away by decrementing the array size. | |
208 | */ | |
209 | static const u32 vmx_msr_index[] = { | |
210 | #ifdef CONFIG_X86_64 | |
211 | MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, | |
212 | #endif | |
213 | MSR_EFER, MSR_K6_STAR, | |
214 | }; | |
215 | #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index) | |
216 | ||
217 | static inline int is_page_fault(u32 intr_info) | |
218 | { | |
219 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
220 | INTR_INFO_VALID_MASK)) == | |
221 | (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK); | |
222 | } | |
223 | ||
224 | static inline int is_no_device(u32 intr_info) | |
225 | { | |
226 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
227 | INTR_INFO_VALID_MASK)) == | |
228 | (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK); | |
229 | } | |
230 | ||
231 | static inline int is_invalid_opcode(u32 intr_info) | |
232 | { | |
233 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
234 | INTR_INFO_VALID_MASK)) == | |
235 | (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK); | |
236 | } | |
237 | ||
238 | static inline int is_external_interrupt(u32 intr_info) | |
239 | { | |
240 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK)) | |
241 | == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK); | |
242 | } | |
243 | ||
244 | static inline int is_machine_check(u32 intr_info) | |
245 | { | |
246 | return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK | | |
247 | INTR_INFO_VALID_MASK)) == | |
248 | (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK); | |
249 | } | |
250 | ||
251 | static inline int cpu_has_vmx_msr_bitmap(void) | |
252 | { | |
253 | return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS; | |
254 | } | |
255 | ||
256 | static inline int cpu_has_vmx_tpr_shadow(void) | |
257 | { | |
258 | return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW; | |
259 | } | |
260 | ||
261 | static inline int vm_need_tpr_shadow(struct kvm *kvm) | |
262 | { | |
263 | return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)); | |
264 | } | |
265 | ||
266 | static inline int cpu_has_secondary_exec_ctrls(void) | |
267 | { | |
268 | return vmcs_config.cpu_based_exec_ctrl & | |
269 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; | |
270 | } | |
271 | ||
272 | static inline bool cpu_has_vmx_virtualize_apic_accesses(void) | |
273 | { | |
274 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
275 | SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
276 | } | |
277 | ||
278 | static inline bool cpu_has_vmx_flexpriority(void) | |
279 | { | |
280 | return cpu_has_vmx_tpr_shadow() && | |
281 | cpu_has_vmx_virtualize_apic_accesses(); | |
282 | } | |
283 | ||
284 | static inline bool cpu_has_vmx_ept_execute_only(void) | |
285 | { | |
286 | return !!(vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT); | |
287 | } | |
288 | ||
289 | static inline bool cpu_has_vmx_eptp_uncacheable(void) | |
290 | { | |
291 | return !!(vmx_capability.ept & VMX_EPTP_UC_BIT); | |
292 | } | |
293 | ||
294 | static inline bool cpu_has_vmx_eptp_writeback(void) | |
295 | { | |
296 | return !!(vmx_capability.ept & VMX_EPTP_WB_BIT); | |
297 | } | |
298 | ||
299 | static inline bool cpu_has_vmx_ept_2m_page(void) | |
300 | { | |
301 | return !!(vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT); | |
302 | } | |
303 | ||
304 | static inline int cpu_has_vmx_invept_individual_addr(void) | |
305 | { | |
306 | return !!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT); | |
307 | } | |
308 | ||
309 | static inline int cpu_has_vmx_invept_context(void) | |
310 | { | |
311 | return !!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT); | |
312 | } | |
313 | ||
314 | static inline int cpu_has_vmx_invept_global(void) | |
315 | { | |
316 | return !!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT); | |
317 | } | |
318 | ||
319 | static inline int cpu_has_vmx_ept(void) | |
320 | { | |
321 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
322 | SECONDARY_EXEC_ENABLE_EPT; | |
323 | } | |
324 | ||
325 | static inline int cpu_has_vmx_unrestricted_guest(void) | |
326 | { | |
327 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
328 | SECONDARY_EXEC_UNRESTRICTED_GUEST; | |
329 | } | |
330 | ||
331 | static inline int cpu_has_vmx_ple(void) | |
332 | { | |
333 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
334 | SECONDARY_EXEC_PAUSE_LOOP_EXITING; | |
335 | } | |
336 | ||
337 | static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm) | |
338 | { | |
339 | return flexpriority_enabled && | |
340 | (cpu_has_vmx_virtualize_apic_accesses()) && | |
341 | (irqchip_in_kernel(kvm)); | |
342 | } | |
343 | ||
344 | static inline int cpu_has_vmx_vpid(void) | |
345 | { | |
346 | return vmcs_config.cpu_based_2nd_exec_ctrl & | |
347 | SECONDARY_EXEC_ENABLE_VPID; | |
348 | } | |
349 | ||
350 | static inline int cpu_has_virtual_nmis(void) | |
351 | { | |
352 | return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS; | |
353 | } | |
354 | ||
355 | static inline bool report_flexpriority(void) | |
356 | { | |
357 | return flexpriority_enabled; | |
358 | } | |
359 | ||
360 | static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) | |
361 | { | |
362 | int i; | |
363 | ||
364 | for (i = 0; i < vmx->nmsrs; ++i) | |
365 | if (vmx_msr_index[vmx->guest_msrs[i].index] == msr) | |
366 | return i; | |
367 | return -1; | |
368 | } | |
369 | ||
370 | static inline void __invvpid(int ext, u16 vpid, gva_t gva) | |
371 | { | |
372 | struct { | |
373 | u64 vpid : 16; | |
374 | u64 rsvd : 48; | |
375 | u64 gva; | |
376 | } operand = { vpid, 0, gva }; | |
377 | ||
378 | asm volatile (__ex(ASM_VMX_INVVPID) | |
379 | /* CF==1 or ZF==1 --> rc = -1 */ | |
380 | "; ja 1f ; ud2 ; 1:" | |
381 | : : "a"(&operand), "c"(ext) : "cc", "memory"); | |
382 | } | |
383 | ||
384 | static inline void __invept(int ext, u64 eptp, gpa_t gpa) | |
385 | { | |
386 | struct { | |
387 | u64 eptp, gpa; | |
388 | } operand = {eptp, gpa}; | |
389 | ||
390 | asm volatile (__ex(ASM_VMX_INVEPT) | |
391 | /* CF==1 or ZF==1 --> rc = -1 */ | |
392 | "; ja 1f ; ud2 ; 1:\n" | |
393 | : : "a" (&operand), "c" (ext) : "cc", "memory"); | |
394 | } | |
395 | ||
396 | static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr) | |
397 | { | |
398 | int i; | |
399 | ||
400 | i = __find_msr_index(vmx, msr); | |
401 | if (i >= 0) | |
402 | return &vmx->guest_msrs[i]; | |
403 | return NULL; | |
404 | } | |
405 | ||
406 | static void vmcs_clear(struct vmcs *vmcs) | |
407 | { | |
408 | u64 phys_addr = __pa(vmcs); | |
409 | u8 error; | |
410 | ||
411 | asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0" | |
412 | : "=g"(error) : "a"(&phys_addr), "m"(phys_addr) | |
413 | : "cc", "memory"); | |
414 | if (error) | |
415 | printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n", | |
416 | vmcs, phys_addr); | |
417 | } | |
418 | ||
419 | static void __vcpu_clear(void *arg) | |
420 | { | |
421 | struct vcpu_vmx *vmx = arg; | |
422 | int cpu = raw_smp_processor_id(); | |
423 | ||
424 | if (vmx->vcpu.cpu == cpu) | |
425 | vmcs_clear(vmx->vmcs); | |
426 | if (per_cpu(current_vmcs, cpu) == vmx->vmcs) | |
427 | per_cpu(current_vmcs, cpu) = NULL; | |
428 | rdtscll(vmx->vcpu.arch.host_tsc); | |
429 | list_del(&vmx->local_vcpus_link); | |
430 | vmx->vcpu.cpu = -1; | |
431 | vmx->launched = 0; | |
432 | } | |
433 | ||
434 | static void vcpu_clear(struct vcpu_vmx *vmx) | |
435 | { | |
436 | if (vmx->vcpu.cpu == -1) | |
437 | return; | |
438 | smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1); | |
439 | } | |
440 | ||
441 | static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx) | |
442 | { | |
443 | if (vmx->vpid == 0) | |
444 | return; | |
445 | ||
446 | __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0); | |
447 | } | |
448 | ||
449 | static inline void ept_sync_global(void) | |
450 | { | |
451 | if (cpu_has_vmx_invept_global()) | |
452 | __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0); | |
453 | } | |
454 | ||
455 | static inline void ept_sync_context(u64 eptp) | |
456 | { | |
457 | if (enable_ept) { | |
458 | if (cpu_has_vmx_invept_context()) | |
459 | __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0); | |
460 | else | |
461 | ept_sync_global(); | |
462 | } | |
463 | } | |
464 | ||
465 | static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa) | |
466 | { | |
467 | if (enable_ept) { | |
468 | if (cpu_has_vmx_invept_individual_addr()) | |
469 | __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR, | |
470 | eptp, gpa); | |
471 | else | |
472 | ept_sync_context(eptp); | |
473 | } | |
474 | } | |
475 | ||
476 | static unsigned long vmcs_readl(unsigned long field) | |
477 | { | |
478 | unsigned long value; | |
479 | ||
480 | asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX) | |
481 | : "=a"(value) : "d"(field) : "cc"); | |
482 | return value; | |
483 | } | |
484 | ||
485 | static u16 vmcs_read16(unsigned long field) | |
486 | { | |
487 | return vmcs_readl(field); | |
488 | } | |
489 | ||
490 | static u32 vmcs_read32(unsigned long field) | |
491 | { | |
492 | return vmcs_readl(field); | |
493 | } | |
494 | ||
495 | static u64 vmcs_read64(unsigned long field) | |
496 | { | |
497 | #ifdef CONFIG_X86_64 | |
498 | return vmcs_readl(field); | |
499 | #else | |
500 | return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32); | |
501 | #endif | |
502 | } | |
503 | ||
504 | static noinline void vmwrite_error(unsigned long field, unsigned long value) | |
505 | { | |
506 | printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", | |
507 | field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); | |
508 | dump_stack(); | |
509 | } | |
510 | ||
511 | static void vmcs_writel(unsigned long field, unsigned long value) | |
512 | { | |
513 | u8 error; | |
514 | ||
515 | asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0" | |
516 | : "=q"(error) : "a"(value), "d"(field) : "cc"); | |
517 | if (unlikely(error)) | |
518 | vmwrite_error(field, value); | |
519 | } | |
520 | ||
521 | static void vmcs_write16(unsigned long field, u16 value) | |
522 | { | |
523 | vmcs_writel(field, value); | |
524 | } | |
525 | ||
526 | static void vmcs_write32(unsigned long field, u32 value) | |
527 | { | |
528 | vmcs_writel(field, value); | |
529 | } | |
530 | ||
531 | static void vmcs_write64(unsigned long field, u64 value) | |
532 | { | |
533 | vmcs_writel(field, value); | |
534 | #ifndef CONFIG_X86_64 | |
535 | asm volatile (""); | |
536 | vmcs_writel(field+1, value >> 32); | |
537 | #endif | |
538 | } | |
539 | ||
540 | static void vmcs_clear_bits(unsigned long field, u32 mask) | |
541 | { | |
542 | vmcs_writel(field, vmcs_readl(field) & ~mask); | |
543 | } | |
544 | ||
545 | static void vmcs_set_bits(unsigned long field, u32 mask) | |
546 | { | |
547 | vmcs_writel(field, vmcs_readl(field) | mask); | |
548 | } | |
549 | ||
550 | static void update_exception_bitmap(struct kvm_vcpu *vcpu) | |
551 | { | |
552 | u32 eb; | |
553 | ||
554 | eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR); | |
555 | if (!vcpu->fpu_active) | |
556 | eb |= 1u << NM_VECTOR; | |
557 | /* | |
558 | * Unconditionally intercept #DB so we can maintain dr6 without | |
559 | * reading it every exit. | |
560 | */ | |
561 | eb |= 1u << DB_VECTOR; | |
562 | if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) { | |
563 | if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) | |
564 | eb |= 1u << BP_VECTOR; | |
565 | } | |
566 | if (to_vmx(vcpu)->rmode.vm86_active) | |
567 | eb = ~0; | |
568 | if (enable_ept) | |
569 | eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */ | |
570 | vmcs_write32(EXCEPTION_BITMAP, eb); | |
571 | } | |
572 | ||
573 | static void reload_tss(void) | |
574 | { | |
575 | /* | |
576 | * VT restores TR but not its size. Useless. | |
577 | */ | |
578 | struct descriptor_table gdt; | |
579 | struct desc_struct *descs; | |
580 | ||
581 | kvm_get_gdt(&gdt); | |
582 | descs = (void *)gdt.base; | |
583 | descs[GDT_ENTRY_TSS].type = 9; /* available TSS */ | |
584 | load_TR_desc(); | |
585 | } | |
586 | ||
587 | static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) | |
588 | { | |
589 | u64 guest_efer; | |
590 | u64 ignore_bits; | |
591 | ||
592 | guest_efer = vmx->vcpu.arch.shadow_efer; | |
593 | ||
594 | /* | |
595 | * NX is emulated; LMA and LME handled by hardware; SCE meaninless | |
596 | * outside long mode | |
597 | */ | |
598 | ignore_bits = EFER_NX | EFER_SCE; | |
599 | #ifdef CONFIG_X86_64 | |
600 | ignore_bits |= EFER_LMA | EFER_LME; | |
601 | /* SCE is meaningful only in long mode on Intel */ | |
602 | if (guest_efer & EFER_LMA) | |
603 | ignore_bits &= ~(u64)EFER_SCE; | |
604 | #endif | |
605 | guest_efer &= ~ignore_bits; | |
606 | guest_efer |= host_efer & ignore_bits; | |
607 | vmx->guest_msrs[efer_offset].data = guest_efer; | |
608 | vmx->guest_msrs[efer_offset].mask = ~ignore_bits; | |
609 | return true; | |
610 | } | |
611 | ||
612 | static void vmx_save_host_state(struct kvm_vcpu *vcpu) | |
613 | { | |
614 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
615 | int i; | |
616 | ||
617 | if (vmx->host_state.loaded) | |
618 | return; | |
619 | ||
620 | vmx->host_state.loaded = 1; | |
621 | /* | |
622 | * Set host fs and gs selectors. Unfortunately, 22.2.3 does not | |
623 | * allow segment selectors with cpl > 0 or ti == 1. | |
624 | */ | |
625 | vmx->host_state.ldt_sel = kvm_read_ldt(); | |
626 | vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel; | |
627 | vmx->host_state.fs_sel = kvm_read_fs(); | |
628 | if (!(vmx->host_state.fs_sel & 7)) { | |
629 | vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel); | |
630 | vmx->host_state.fs_reload_needed = 0; | |
631 | } else { | |
632 | vmcs_write16(HOST_FS_SELECTOR, 0); | |
633 | vmx->host_state.fs_reload_needed = 1; | |
634 | } | |
635 | vmx->host_state.gs_sel = kvm_read_gs(); | |
636 | if (!(vmx->host_state.gs_sel & 7)) | |
637 | vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel); | |
638 | else { | |
639 | vmcs_write16(HOST_GS_SELECTOR, 0); | |
640 | vmx->host_state.gs_ldt_reload_needed = 1; | |
641 | } | |
642 | ||
643 | #ifdef CONFIG_X86_64 | |
644 | vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE)); | |
645 | vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE)); | |
646 | #else | |
647 | vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel)); | |
648 | vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel)); | |
649 | #endif | |
650 | ||
651 | #ifdef CONFIG_X86_64 | |
652 | if (is_long_mode(&vmx->vcpu)) { | |
653 | rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); | |
654 | wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); | |
655 | } | |
656 | #endif | |
657 | for (i = 0; i < vmx->save_nmsrs; ++i) | |
658 | kvm_set_shared_msr(vmx->guest_msrs[i].index, | |
659 | vmx->guest_msrs[i].data, | |
660 | vmx->guest_msrs[i].mask); | |
661 | } | |
662 | ||
663 | static void __vmx_load_host_state(struct vcpu_vmx *vmx) | |
664 | { | |
665 | unsigned long flags; | |
666 | ||
667 | if (!vmx->host_state.loaded) | |
668 | return; | |
669 | ||
670 | ++vmx->vcpu.stat.host_state_reload; | |
671 | vmx->host_state.loaded = 0; | |
672 | if (vmx->host_state.fs_reload_needed) | |
673 | kvm_load_fs(vmx->host_state.fs_sel); | |
674 | if (vmx->host_state.gs_ldt_reload_needed) { | |
675 | kvm_load_ldt(vmx->host_state.ldt_sel); | |
676 | /* | |
677 | * If we have to reload gs, we must take care to | |
678 | * preserve our gs base. | |
679 | */ | |
680 | local_irq_save(flags); | |
681 | kvm_load_gs(vmx->host_state.gs_sel); | |
682 | #ifdef CONFIG_X86_64 | |
683 | wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE)); | |
684 | #endif | |
685 | local_irq_restore(flags); | |
686 | } | |
687 | reload_tss(); | |
688 | #ifdef CONFIG_X86_64 | |
689 | if (is_long_mode(&vmx->vcpu)) { | |
690 | rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); | |
691 | wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); | |
692 | } | |
693 | #endif | |
694 | } | |
695 | ||
696 | static void vmx_load_host_state(struct vcpu_vmx *vmx) | |
697 | { | |
698 | preempt_disable(); | |
699 | __vmx_load_host_state(vmx); | |
700 | preempt_enable(); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Switches to specified vcpu, until a matching vcpu_put(), but assumes | |
705 | * vcpu mutex is already taken. | |
706 | */ | |
707 | static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
708 | { | |
709 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
710 | u64 phys_addr = __pa(vmx->vmcs); | |
711 | u64 tsc_this, delta, new_offset; | |
712 | ||
713 | if (vcpu->cpu != cpu) { | |
714 | vcpu_clear(vmx); | |
715 | kvm_migrate_timers(vcpu); | |
716 | set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests); | |
717 | local_irq_disable(); | |
718 | list_add(&vmx->local_vcpus_link, | |
719 | &per_cpu(vcpus_on_cpu, cpu)); | |
720 | local_irq_enable(); | |
721 | } | |
722 | ||
723 | if (per_cpu(current_vmcs, cpu) != vmx->vmcs) { | |
724 | u8 error; | |
725 | ||
726 | per_cpu(current_vmcs, cpu) = vmx->vmcs; | |
727 | asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0" | |
728 | : "=g"(error) : "a"(&phys_addr), "m"(phys_addr) | |
729 | : "cc"); | |
730 | if (error) | |
731 | printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n", | |
732 | vmx->vmcs, phys_addr); | |
733 | } | |
734 | ||
735 | if (vcpu->cpu != cpu) { | |
736 | struct descriptor_table dt; | |
737 | unsigned long sysenter_esp; | |
738 | ||
739 | vcpu->cpu = cpu; | |
740 | /* | |
741 | * Linux uses per-cpu TSS and GDT, so set these when switching | |
742 | * processors. | |
743 | */ | |
744 | vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */ | |
745 | kvm_get_gdt(&dt); | |
746 | vmcs_writel(HOST_GDTR_BASE, dt.base); /* 22.2.4 */ | |
747 | ||
748 | rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); | |
749 | vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ | |
750 | ||
751 | /* | |
752 | * Make sure the time stamp counter is monotonous. | |
753 | */ | |
754 | rdtscll(tsc_this); | |
755 | if (tsc_this < vcpu->arch.host_tsc) { | |
756 | delta = vcpu->arch.host_tsc - tsc_this; | |
757 | new_offset = vmcs_read64(TSC_OFFSET) + delta; | |
758 | vmcs_write64(TSC_OFFSET, new_offset); | |
759 | } | |
760 | } | |
761 | } | |
762 | ||
763 | static void vmx_vcpu_put(struct kvm_vcpu *vcpu) | |
764 | { | |
765 | __vmx_load_host_state(to_vmx(vcpu)); | |
766 | } | |
767 | ||
768 | static void vmx_fpu_activate(struct kvm_vcpu *vcpu) | |
769 | { | |
770 | if (vcpu->fpu_active) | |
771 | return; | |
772 | vcpu->fpu_active = 1; | |
773 | vmcs_clear_bits(GUEST_CR0, X86_CR0_TS); | |
774 | if (vcpu->arch.cr0 & X86_CR0_TS) | |
775 | vmcs_set_bits(GUEST_CR0, X86_CR0_TS); | |
776 | update_exception_bitmap(vcpu); | |
777 | } | |
778 | ||
779 | static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu) | |
780 | { | |
781 | if (!vcpu->fpu_active) | |
782 | return; | |
783 | vcpu->fpu_active = 0; | |
784 | vmcs_set_bits(GUEST_CR0, X86_CR0_TS); | |
785 | update_exception_bitmap(vcpu); | |
786 | } | |
787 | ||
788 | static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu) | |
789 | { | |
790 | unsigned long rflags; | |
791 | ||
792 | rflags = vmcs_readl(GUEST_RFLAGS); | |
793 | if (to_vmx(vcpu)->rmode.vm86_active) | |
794 | rflags &= ~(unsigned long)(X86_EFLAGS_IOPL | X86_EFLAGS_VM); | |
795 | return rflags; | |
796 | } | |
797 | ||
798 | static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) | |
799 | { | |
800 | if (to_vmx(vcpu)->rmode.vm86_active) | |
801 | rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; | |
802 | vmcs_writel(GUEST_RFLAGS, rflags); | |
803 | } | |
804 | ||
805 | static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) | |
806 | { | |
807 | u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); | |
808 | int ret = 0; | |
809 | ||
810 | if (interruptibility & GUEST_INTR_STATE_STI) | |
811 | ret |= X86_SHADOW_INT_STI; | |
812 | if (interruptibility & GUEST_INTR_STATE_MOV_SS) | |
813 | ret |= X86_SHADOW_INT_MOV_SS; | |
814 | ||
815 | return ret & mask; | |
816 | } | |
817 | ||
818 | static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask) | |
819 | { | |
820 | u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO); | |
821 | u32 interruptibility = interruptibility_old; | |
822 | ||
823 | interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS); | |
824 | ||
825 | if (mask & X86_SHADOW_INT_MOV_SS) | |
826 | interruptibility |= GUEST_INTR_STATE_MOV_SS; | |
827 | if (mask & X86_SHADOW_INT_STI) | |
828 | interruptibility |= GUEST_INTR_STATE_STI; | |
829 | ||
830 | if ((interruptibility != interruptibility_old)) | |
831 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility); | |
832 | } | |
833 | ||
834 | static void skip_emulated_instruction(struct kvm_vcpu *vcpu) | |
835 | { | |
836 | unsigned long rip; | |
837 | ||
838 | rip = kvm_rip_read(vcpu); | |
839 | rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
840 | kvm_rip_write(vcpu, rip); | |
841 | ||
842 | /* skipping an emulated instruction also counts */ | |
843 | vmx_set_interrupt_shadow(vcpu, 0); | |
844 | } | |
845 | ||
846 | static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr, | |
847 | bool has_error_code, u32 error_code) | |
848 | { | |
849 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
850 | u32 intr_info = nr | INTR_INFO_VALID_MASK; | |
851 | ||
852 | if (has_error_code) { | |
853 | vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code); | |
854 | intr_info |= INTR_INFO_DELIVER_CODE_MASK; | |
855 | } | |
856 | ||
857 | if (vmx->rmode.vm86_active) { | |
858 | vmx->rmode.irq.pending = true; | |
859 | vmx->rmode.irq.vector = nr; | |
860 | vmx->rmode.irq.rip = kvm_rip_read(vcpu); | |
861 | if (kvm_exception_is_soft(nr)) | |
862 | vmx->rmode.irq.rip += | |
863 | vmx->vcpu.arch.event_exit_inst_len; | |
864 | intr_info |= INTR_TYPE_SOFT_INTR; | |
865 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); | |
866 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1); | |
867 | kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1); | |
868 | return; | |
869 | } | |
870 | ||
871 | if (kvm_exception_is_soft(nr)) { | |
872 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, | |
873 | vmx->vcpu.arch.event_exit_inst_len); | |
874 | intr_info |= INTR_TYPE_SOFT_EXCEPTION; | |
875 | } else | |
876 | intr_info |= INTR_TYPE_HARD_EXCEPTION; | |
877 | ||
878 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info); | |
879 | } | |
880 | ||
881 | /* | |
882 | * Swap MSR entry in host/guest MSR entry array. | |
883 | */ | |
884 | static void move_msr_up(struct vcpu_vmx *vmx, int from, int to) | |
885 | { | |
886 | struct shared_msr_entry tmp; | |
887 | ||
888 | tmp = vmx->guest_msrs[to]; | |
889 | vmx->guest_msrs[to] = vmx->guest_msrs[from]; | |
890 | vmx->guest_msrs[from] = tmp; | |
891 | } | |
892 | ||
893 | /* | |
894 | * Set up the vmcs to automatically save and restore system | |
895 | * msrs. Don't touch the 64-bit msrs if the guest is in legacy | |
896 | * mode, as fiddling with msrs is very expensive. | |
897 | */ | |
898 | static void setup_msrs(struct vcpu_vmx *vmx) | |
899 | { | |
900 | int save_nmsrs, index; | |
901 | unsigned long *msr_bitmap; | |
902 | ||
903 | vmx_load_host_state(vmx); | |
904 | save_nmsrs = 0; | |
905 | #ifdef CONFIG_X86_64 | |
906 | if (is_long_mode(&vmx->vcpu)) { | |
907 | index = __find_msr_index(vmx, MSR_SYSCALL_MASK); | |
908 | if (index >= 0) | |
909 | move_msr_up(vmx, index, save_nmsrs++); | |
910 | index = __find_msr_index(vmx, MSR_LSTAR); | |
911 | if (index >= 0) | |
912 | move_msr_up(vmx, index, save_nmsrs++); | |
913 | index = __find_msr_index(vmx, MSR_CSTAR); | |
914 | if (index >= 0) | |
915 | move_msr_up(vmx, index, save_nmsrs++); | |
916 | /* | |
917 | * MSR_K6_STAR is only needed on long mode guests, and only | |
918 | * if efer.sce is enabled. | |
919 | */ | |
920 | index = __find_msr_index(vmx, MSR_K6_STAR); | |
921 | if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE)) | |
922 | move_msr_up(vmx, index, save_nmsrs++); | |
923 | } | |
924 | #endif | |
925 | index = __find_msr_index(vmx, MSR_EFER); | |
926 | if (index >= 0 && update_transition_efer(vmx, index)) | |
927 | move_msr_up(vmx, index, save_nmsrs++); | |
928 | ||
929 | vmx->save_nmsrs = save_nmsrs; | |
930 | ||
931 | if (cpu_has_vmx_msr_bitmap()) { | |
932 | if (is_long_mode(&vmx->vcpu)) | |
933 | msr_bitmap = vmx_msr_bitmap_longmode; | |
934 | else | |
935 | msr_bitmap = vmx_msr_bitmap_legacy; | |
936 | ||
937 | vmcs_write64(MSR_BITMAP, __pa(msr_bitmap)); | |
938 | } | |
939 | } | |
940 | ||
941 | /* | |
942 | * reads and returns guest's timestamp counter "register" | |
943 | * guest_tsc = host_tsc + tsc_offset -- 21.3 | |
944 | */ | |
945 | static u64 guest_read_tsc(void) | |
946 | { | |
947 | u64 host_tsc, tsc_offset; | |
948 | ||
949 | rdtscll(host_tsc); | |
950 | tsc_offset = vmcs_read64(TSC_OFFSET); | |
951 | return host_tsc + tsc_offset; | |
952 | } | |
953 | ||
954 | /* | |
955 | * writes 'guest_tsc' into guest's timestamp counter "register" | |
956 | * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc | |
957 | */ | |
958 | static void guest_write_tsc(u64 guest_tsc, u64 host_tsc) | |
959 | { | |
960 | vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc); | |
961 | } | |
962 | ||
963 | /* | |
964 | * Reads an msr value (of 'msr_index') into 'pdata'. | |
965 | * Returns 0 on success, non-0 otherwise. | |
966 | * Assumes vcpu_load() was already called. | |
967 | */ | |
968 | static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) | |
969 | { | |
970 | u64 data; | |
971 | struct shared_msr_entry *msr; | |
972 | ||
973 | if (!pdata) { | |
974 | printk(KERN_ERR "BUG: get_msr called with NULL pdata\n"); | |
975 | return -EINVAL; | |
976 | } | |
977 | ||
978 | switch (msr_index) { | |
979 | #ifdef CONFIG_X86_64 | |
980 | case MSR_FS_BASE: | |
981 | data = vmcs_readl(GUEST_FS_BASE); | |
982 | break; | |
983 | case MSR_GS_BASE: | |
984 | data = vmcs_readl(GUEST_GS_BASE); | |
985 | break; | |
986 | case MSR_KERNEL_GS_BASE: | |
987 | vmx_load_host_state(to_vmx(vcpu)); | |
988 | data = to_vmx(vcpu)->msr_guest_kernel_gs_base; | |
989 | break; | |
990 | #endif | |
991 | case MSR_EFER: | |
992 | return kvm_get_msr_common(vcpu, msr_index, pdata); | |
993 | case MSR_IA32_TSC: | |
994 | data = guest_read_tsc(); | |
995 | break; | |
996 | case MSR_IA32_SYSENTER_CS: | |
997 | data = vmcs_read32(GUEST_SYSENTER_CS); | |
998 | break; | |
999 | case MSR_IA32_SYSENTER_EIP: | |
1000 | data = vmcs_readl(GUEST_SYSENTER_EIP); | |
1001 | break; | |
1002 | case MSR_IA32_SYSENTER_ESP: | |
1003 | data = vmcs_readl(GUEST_SYSENTER_ESP); | |
1004 | break; | |
1005 | default: | |
1006 | vmx_load_host_state(to_vmx(vcpu)); | |
1007 | msr = find_msr_entry(to_vmx(vcpu), msr_index); | |
1008 | if (msr) { | |
1009 | vmx_load_host_state(to_vmx(vcpu)); | |
1010 | data = msr->data; | |
1011 | break; | |
1012 | } | |
1013 | return kvm_get_msr_common(vcpu, msr_index, pdata); | |
1014 | } | |
1015 | ||
1016 | *pdata = data; | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * Writes msr value into into the appropriate "register". | |
1022 | * Returns 0 on success, non-0 otherwise. | |
1023 | * Assumes vcpu_load() was already called. | |
1024 | */ | |
1025 | static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) | |
1026 | { | |
1027 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1028 | struct shared_msr_entry *msr; | |
1029 | u64 host_tsc; | |
1030 | int ret = 0; | |
1031 | ||
1032 | switch (msr_index) { | |
1033 | case MSR_EFER: | |
1034 | vmx_load_host_state(vmx); | |
1035 | ret = kvm_set_msr_common(vcpu, msr_index, data); | |
1036 | break; | |
1037 | #ifdef CONFIG_X86_64 | |
1038 | case MSR_FS_BASE: | |
1039 | vmcs_writel(GUEST_FS_BASE, data); | |
1040 | break; | |
1041 | case MSR_GS_BASE: | |
1042 | vmcs_writel(GUEST_GS_BASE, data); | |
1043 | break; | |
1044 | case MSR_KERNEL_GS_BASE: | |
1045 | vmx_load_host_state(vmx); | |
1046 | vmx->msr_guest_kernel_gs_base = data; | |
1047 | break; | |
1048 | #endif | |
1049 | case MSR_IA32_SYSENTER_CS: | |
1050 | vmcs_write32(GUEST_SYSENTER_CS, data); | |
1051 | break; | |
1052 | case MSR_IA32_SYSENTER_EIP: | |
1053 | vmcs_writel(GUEST_SYSENTER_EIP, data); | |
1054 | break; | |
1055 | case MSR_IA32_SYSENTER_ESP: | |
1056 | vmcs_writel(GUEST_SYSENTER_ESP, data); | |
1057 | break; | |
1058 | case MSR_IA32_TSC: | |
1059 | rdtscll(host_tsc); | |
1060 | guest_write_tsc(data, host_tsc); | |
1061 | break; | |
1062 | case MSR_IA32_CR_PAT: | |
1063 | if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { | |
1064 | vmcs_write64(GUEST_IA32_PAT, data); | |
1065 | vcpu->arch.pat = data; | |
1066 | break; | |
1067 | } | |
1068 | /* Otherwise falls through to kvm_set_msr_common */ | |
1069 | default: | |
1070 | msr = find_msr_entry(vmx, msr_index); | |
1071 | if (msr) { | |
1072 | vmx_load_host_state(vmx); | |
1073 | msr->data = data; | |
1074 | break; | |
1075 | } | |
1076 | ret = kvm_set_msr_common(vcpu, msr_index, data); | |
1077 | } | |
1078 | ||
1079 | return ret; | |
1080 | } | |
1081 | ||
1082 | static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) | |
1083 | { | |
1084 | __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail); | |
1085 | switch (reg) { | |
1086 | case VCPU_REGS_RSP: | |
1087 | vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); | |
1088 | break; | |
1089 | case VCPU_REGS_RIP: | |
1090 | vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); | |
1091 | break; | |
1092 | case VCPU_EXREG_PDPTR: | |
1093 | if (enable_ept) | |
1094 | ept_save_pdptrs(vcpu); | |
1095 | break; | |
1096 | default: | |
1097 | break; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) | |
1102 | { | |
1103 | if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) | |
1104 | vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]); | |
1105 | else | |
1106 | vmcs_writel(GUEST_DR7, vcpu->arch.dr7); | |
1107 | ||
1108 | update_exception_bitmap(vcpu); | |
1109 | } | |
1110 | ||
1111 | static __init int cpu_has_kvm_support(void) | |
1112 | { | |
1113 | return cpu_has_vmx(); | |
1114 | } | |
1115 | ||
1116 | static __init int vmx_disabled_by_bios(void) | |
1117 | { | |
1118 | u64 msr; | |
1119 | ||
1120 | rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); | |
1121 | return (msr & (FEATURE_CONTROL_LOCKED | | |
1122 | FEATURE_CONTROL_VMXON_ENABLED)) | |
1123 | == FEATURE_CONTROL_LOCKED; | |
1124 | /* locked but not enabled */ | |
1125 | } | |
1126 | ||
1127 | static int hardware_enable(void *garbage) | |
1128 | { | |
1129 | int cpu = raw_smp_processor_id(); | |
1130 | u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); | |
1131 | u64 old; | |
1132 | ||
1133 | if (read_cr4() & X86_CR4_VMXE) | |
1134 | return -EBUSY; | |
1135 | ||
1136 | INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu)); | |
1137 | rdmsrl(MSR_IA32_FEATURE_CONTROL, old); | |
1138 | if ((old & (FEATURE_CONTROL_LOCKED | | |
1139 | FEATURE_CONTROL_VMXON_ENABLED)) | |
1140 | != (FEATURE_CONTROL_LOCKED | | |
1141 | FEATURE_CONTROL_VMXON_ENABLED)) | |
1142 | /* enable and lock */ | |
1143 | wrmsrl(MSR_IA32_FEATURE_CONTROL, old | | |
1144 | FEATURE_CONTROL_LOCKED | | |
1145 | FEATURE_CONTROL_VMXON_ENABLED); | |
1146 | write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */ | |
1147 | asm volatile (ASM_VMX_VMXON_RAX | |
1148 | : : "a"(&phys_addr), "m"(phys_addr) | |
1149 | : "memory", "cc"); | |
1150 | ||
1151 | ept_sync_global(); | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | static void vmclear_local_vcpus(void) | |
1157 | { | |
1158 | int cpu = raw_smp_processor_id(); | |
1159 | struct vcpu_vmx *vmx, *n; | |
1160 | ||
1161 | list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu), | |
1162 | local_vcpus_link) | |
1163 | __vcpu_clear(vmx); | |
1164 | } | |
1165 | ||
1166 | ||
1167 | /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot() | |
1168 | * tricks. | |
1169 | */ | |
1170 | static void kvm_cpu_vmxoff(void) | |
1171 | { | |
1172 | asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc"); | |
1173 | write_cr4(read_cr4() & ~X86_CR4_VMXE); | |
1174 | } | |
1175 | ||
1176 | static void hardware_disable(void *garbage) | |
1177 | { | |
1178 | vmclear_local_vcpus(); | |
1179 | kvm_cpu_vmxoff(); | |
1180 | } | |
1181 | ||
1182 | static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt, | |
1183 | u32 msr, u32 *result) | |
1184 | { | |
1185 | u32 vmx_msr_low, vmx_msr_high; | |
1186 | u32 ctl = ctl_min | ctl_opt; | |
1187 | ||
1188 | rdmsr(msr, vmx_msr_low, vmx_msr_high); | |
1189 | ||
1190 | ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */ | |
1191 | ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */ | |
1192 | ||
1193 | /* Ensure minimum (required) set of control bits are supported. */ | |
1194 | if (ctl_min & ~ctl) | |
1195 | return -EIO; | |
1196 | ||
1197 | *result = ctl; | |
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) | |
1202 | { | |
1203 | u32 vmx_msr_low, vmx_msr_high; | |
1204 | u32 min, opt, min2, opt2; | |
1205 | u32 _pin_based_exec_control = 0; | |
1206 | u32 _cpu_based_exec_control = 0; | |
1207 | u32 _cpu_based_2nd_exec_control = 0; | |
1208 | u32 _vmexit_control = 0; | |
1209 | u32 _vmentry_control = 0; | |
1210 | ||
1211 | min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING; | |
1212 | opt = PIN_BASED_VIRTUAL_NMIS; | |
1213 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS, | |
1214 | &_pin_based_exec_control) < 0) | |
1215 | return -EIO; | |
1216 | ||
1217 | min = CPU_BASED_HLT_EXITING | | |
1218 | #ifdef CONFIG_X86_64 | |
1219 | CPU_BASED_CR8_LOAD_EXITING | | |
1220 | CPU_BASED_CR8_STORE_EXITING | | |
1221 | #endif | |
1222 | CPU_BASED_CR3_LOAD_EXITING | | |
1223 | CPU_BASED_CR3_STORE_EXITING | | |
1224 | CPU_BASED_USE_IO_BITMAPS | | |
1225 | CPU_BASED_MOV_DR_EXITING | | |
1226 | CPU_BASED_USE_TSC_OFFSETING | | |
1227 | CPU_BASED_MWAIT_EXITING | | |
1228 | CPU_BASED_MONITOR_EXITING | | |
1229 | CPU_BASED_INVLPG_EXITING; | |
1230 | opt = CPU_BASED_TPR_SHADOW | | |
1231 | CPU_BASED_USE_MSR_BITMAPS | | |
1232 | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS; | |
1233 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, | |
1234 | &_cpu_based_exec_control) < 0) | |
1235 | return -EIO; | |
1236 | #ifdef CONFIG_X86_64 | |
1237 | if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) | |
1238 | _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & | |
1239 | ~CPU_BASED_CR8_STORE_EXITING; | |
1240 | #endif | |
1241 | if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) { | |
1242 | min2 = 0; | |
1243 | opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | | |
1244 | SECONDARY_EXEC_WBINVD_EXITING | | |
1245 | SECONDARY_EXEC_ENABLE_VPID | | |
1246 | SECONDARY_EXEC_ENABLE_EPT | | |
1247 | SECONDARY_EXEC_UNRESTRICTED_GUEST | | |
1248 | SECONDARY_EXEC_PAUSE_LOOP_EXITING; | |
1249 | if (adjust_vmx_controls(min2, opt2, | |
1250 | MSR_IA32_VMX_PROCBASED_CTLS2, | |
1251 | &_cpu_based_2nd_exec_control) < 0) | |
1252 | return -EIO; | |
1253 | } | |
1254 | #ifndef CONFIG_X86_64 | |
1255 | if (!(_cpu_based_2nd_exec_control & | |
1256 | SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) | |
1257 | _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW; | |
1258 | #endif | |
1259 | if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) { | |
1260 | /* CR3 accesses and invlpg don't need to cause VM Exits when EPT | |
1261 | enabled */ | |
1262 | _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING | | |
1263 | CPU_BASED_CR3_STORE_EXITING | | |
1264 | CPU_BASED_INVLPG_EXITING); | |
1265 | rdmsr(MSR_IA32_VMX_EPT_VPID_CAP, | |
1266 | vmx_capability.ept, vmx_capability.vpid); | |
1267 | } | |
1268 | ||
1269 | min = 0; | |
1270 | #ifdef CONFIG_X86_64 | |
1271 | min |= VM_EXIT_HOST_ADDR_SPACE_SIZE; | |
1272 | #endif | |
1273 | opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT; | |
1274 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS, | |
1275 | &_vmexit_control) < 0) | |
1276 | return -EIO; | |
1277 | ||
1278 | min = 0; | |
1279 | opt = VM_ENTRY_LOAD_IA32_PAT; | |
1280 | if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS, | |
1281 | &_vmentry_control) < 0) | |
1282 | return -EIO; | |
1283 | ||
1284 | rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high); | |
1285 | ||
1286 | /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */ | |
1287 | if ((vmx_msr_high & 0x1fff) > PAGE_SIZE) | |
1288 | return -EIO; | |
1289 | ||
1290 | #ifdef CONFIG_X86_64 | |
1291 | /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */ | |
1292 | if (vmx_msr_high & (1u<<16)) | |
1293 | return -EIO; | |
1294 | #endif | |
1295 | ||
1296 | /* Require Write-Back (WB) memory type for VMCS accesses. */ | |
1297 | if (((vmx_msr_high >> 18) & 15) != 6) | |
1298 | return -EIO; | |
1299 | ||
1300 | vmcs_conf->size = vmx_msr_high & 0x1fff; | |
1301 | vmcs_conf->order = get_order(vmcs_config.size); | |
1302 | vmcs_conf->revision_id = vmx_msr_low; | |
1303 | ||
1304 | vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; | |
1305 | vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control; | |
1306 | vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control; | |
1307 | vmcs_conf->vmexit_ctrl = _vmexit_control; | |
1308 | vmcs_conf->vmentry_ctrl = _vmentry_control; | |
1309 | ||
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | static struct vmcs *alloc_vmcs_cpu(int cpu) | |
1314 | { | |
1315 | int node = cpu_to_node(cpu); | |
1316 | struct page *pages; | |
1317 | struct vmcs *vmcs; | |
1318 | ||
1319 | pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order); | |
1320 | if (!pages) | |
1321 | return NULL; | |
1322 | vmcs = page_address(pages); | |
1323 | memset(vmcs, 0, vmcs_config.size); | |
1324 | vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */ | |
1325 | return vmcs; | |
1326 | } | |
1327 | ||
1328 | static struct vmcs *alloc_vmcs(void) | |
1329 | { | |
1330 | return alloc_vmcs_cpu(raw_smp_processor_id()); | |
1331 | } | |
1332 | ||
1333 | static void free_vmcs(struct vmcs *vmcs) | |
1334 | { | |
1335 | free_pages((unsigned long)vmcs, vmcs_config.order); | |
1336 | } | |
1337 | ||
1338 | static void free_kvm_area(void) | |
1339 | { | |
1340 | int cpu; | |
1341 | ||
1342 | for_each_possible_cpu(cpu) { | |
1343 | free_vmcs(per_cpu(vmxarea, cpu)); | |
1344 | per_cpu(vmxarea, cpu) = NULL; | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | static __init int alloc_kvm_area(void) | |
1349 | { | |
1350 | int cpu; | |
1351 | ||
1352 | for_each_possible_cpu(cpu) { | |
1353 | struct vmcs *vmcs; | |
1354 | ||
1355 | vmcs = alloc_vmcs_cpu(cpu); | |
1356 | if (!vmcs) { | |
1357 | free_kvm_area(); | |
1358 | return -ENOMEM; | |
1359 | } | |
1360 | ||
1361 | per_cpu(vmxarea, cpu) = vmcs; | |
1362 | } | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | static __init int hardware_setup(void) | |
1367 | { | |
1368 | if (setup_vmcs_config(&vmcs_config) < 0) | |
1369 | return -EIO; | |
1370 | ||
1371 | if (boot_cpu_has(X86_FEATURE_NX)) | |
1372 | kvm_enable_efer_bits(EFER_NX); | |
1373 | ||
1374 | if (!cpu_has_vmx_vpid()) | |
1375 | enable_vpid = 0; | |
1376 | ||
1377 | if (!cpu_has_vmx_ept()) { | |
1378 | enable_ept = 0; | |
1379 | enable_unrestricted_guest = 0; | |
1380 | } | |
1381 | ||
1382 | if (!cpu_has_vmx_unrestricted_guest()) | |
1383 | enable_unrestricted_guest = 0; | |
1384 | ||
1385 | if (!cpu_has_vmx_flexpriority()) | |
1386 | flexpriority_enabled = 0; | |
1387 | ||
1388 | if (!cpu_has_vmx_tpr_shadow()) | |
1389 | kvm_x86_ops->update_cr8_intercept = NULL; | |
1390 | ||
1391 | if (enable_ept && !cpu_has_vmx_ept_2m_page()) | |
1392 | kvm_disable_largepages(); | |
1393 | ||
1394 | if (!cpu_has_vmx_ple()) | |
1395 | ple_gap = 0; | |
1396 | ||
1397 | return alloc_kvm_area(); | |
1398 | } | |
1399 | ||
1400 | static __exit void hardware_unsetup(void) | |
1401 | { | |
1402 | free_kvm_area(); | |
1403 | } | |
1404 | ||
1405 | static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save) | |
1406 | { | |
1407 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
1408 | ||
1409 | if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) { | |
1410 | vmcs_write16(sf->selector, save->selector); | |
1411 | vmcs_writel(sf->base, save->base); | |
1412 | vmcs_write32(sf->limit, save->limit); | |
1413 | vmcs_write32(sf->ar_bytes, save->ar); | |
1414 | } else { | |
1415 | u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK) | |
1416 | << AR_DPL_SHIFT; | |
1417 | vmcs_write32(sf->ar_bytes, 0x93 | dpl); | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | static void enter_pmode(struct kvm_vcpu *vcpu) | |
1422 | { | |
1423 | unsigned long flags; | |
1424 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1425 | ||
1426 | vmx->emulation_required = 1; | |
1427 | vmx->rmode.vm86_active = 0; | |
1428 | ||
1429 | vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base); | |
1430 | vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit); | |
1431 | vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar); | |
1432 | ||
1433 | flags = vmcs_readl(GUEST_RFLAGS); | |
1434 | flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM); | |
1435 | flags |= (vmx->rmode.save_iopl << IOPL_SHIFT); | |
1436 | vmcs_writel(GUEST_RFLAGS, flags); | |
1437 | ||
1438 | vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) | | |
1439 | (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME)); | |
1440 | ||
1441 | update_exception_bitmap(vcpu); | |
1442 | ||
1443 | if (emulate_invalid_guest_state) | |
1444 | return; | |
1445 | ||
1446 | fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es); | |
1447 | fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds); | |
1448 | fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs); | |
1449 | fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs); | |
1450 | ||
1451 | vmcs_write16(GUEST_SS_SELECTOR, 0); | |
1452 | vmcs_write32(GUEST_SS_AR_BYTES, 0x93); | |
1453 | ||
1454 | vmcs_write16(GUEST_CS_SELECTOR, | |
1455 | vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK); | |
1456 | vmcs_write32(GUEST_CS_AR_BYTES, 0x9b); | |
1457 | } | |
1458 | ||
1459 | static gva_t rmode_tss_base(struct kvm *kvm) | |
1460 | { | |
1461 | if (!kvm->arch.tss_addr) { | |
1462 | gfn_t base_gfn = kvm->memslots[0].base_gfn + | |
1463 | kvm->memslots[0].npages - 3; | |
1464 | return base_gfn << PAGE_SHIFT; | |
1465 | } | |
1466 | return kvm->arch.tss_addr; | |
1467 | } | |
1468 | ||
1469 | static void fix_rmode_seg(int seg, struct kvm_save_segment *save) | |
1470 | { | |
1471 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
1472 | ||
1473 | save->selector = vmcs_read16(sf->selector); | |
1474 | save->base = vmcs_readl(sf->base); | |
1475 | save->limit = vmcs_read32(sf->limit); | |
1476 | save->ar = vmcs_read32(sf->ar_bytes); | |
1477 | vmcs_write16(sf->selector, save->base >> 4); | |
1478 | vmcs_write32(sf->base, save->base & 0xfffff); | |
1479 | vmcs_write32(sf->limit, 0xffff); | |
1480 | vmcs_write32(sf->ar_bytes, 0xf3); | |
1481 | } | |
1482 | ||
1483 | static void enter_rmode(struct kvm_vcpu *vcpu) | |
1484 | { | |
1485 | unsigned long flags; | |
1486 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1487 | ||
1488 | if (enable_unrestricted_guest) | |
1489 | return; | |
1490 | ||
1491 | vmx->emulation_required = 1; | |
1492 | vmx->rmode.vm86_active = 1; | |
1493 | ||
1494 | vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE); | |
1495 | vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm)); | |
1496 | ||
1497 | vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT); | |
1498 | vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1); | |
1499 | ||
1500 | vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES); | |
1501 | vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); | |
1502 | ||
1503 | flags = vmcs_readl(GUEST_RFLAGS); | |
1504 | vmx->rmode.save_iopl | |
1505 | = (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT; | |
1506 | ||
1507 | flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM; | |
1508 | ||
1509 | vmcs_writel(GUEST_RFLAGS, flags); | |
1510 | vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME); | |
1511 | update_exception_bitmap(vcpu); | |
1512 | ||
1513 | if (emulate_invalid_guest_state) | |
1514 | goto continue_rmode; | |
1515 | ||
1516 | vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4); | |
1517 | vmcs_write32(GUEST_SS_LIMIT, 0xffff); | |
1518 | vmcs_write32(GUEST_SS_AR_BYTES, 0xf3); | |
1519 | ||
1520 | vmcs_write32(GUEST_CS_AR_BYTES, 0xf3); | |
1521 | vmcs_write32(GUEST_CS_LIMIT, 0xffff); | |
1522 | if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000) | |
1523 | vmcs_writel(GUEST_CS_BASE, 0xf0000); | |
1524 | vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4); | |
1525 | ||
1526 | fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es); | |
1527 | fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds); | |
1528 | fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs); | |
1529 | fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs); | |
1530 | ||
1531 | continue_rmode: | |
1532 | kvm_mmu_reset_context(vcpu); | |
1533 | init_rmode(vcpu->kvm); | |
1534 | } | |
1535 | ||
1536 | static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) | |
1537 | { | |
1538 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1539 | struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER); | |
1540 | ||
1541 | if (!msr) | |
1542 | return; | |
1543 | ||
1544 | /* | |
1545 | * Force kernel_gs_base reloading before EFER changes, as control | |
1546 | * of this msr depends on is_long_mode(). | |
1547 | */ | |
1548 | vmx_load_host_state(to_vmx(vcpu)); | |
1549 | vcpu->arch.shadow_efer = efer; | |
1550 | if (!msr) | |
1551 | return; | |
1552 | if (efer & EFER_LMA) { | |
1553 | vmcs_write32(VM_ENTRY_CONTROLS, | |
1554 | vmcs_read32(VM_ENTRY_CONTROLS) | | |
1555 | VM_ENTRY_IA32E_MODE); | |
1556 | msr->data = efer; | |
1557 | } else { | |
1558 | vmcs_write32(VM_ENTRY_CONTROLS, | |
1559 | vmcs_read32(VM_ENTRY_CONTROLS) & | |
1560 | ~VM_ENTRY_IA32E_MODE); | |
1561 | ||
1562 | msr->data = efer & ~EFER_LME; | |
1563 | } | |
1564 | setup_msrs(vmx); | |
1565 | } | |
1566 | ||
1567 | #ifdef CONFIG_X86_64 | |
1568 | ||
1569 | static void enter_lmode(struct kvm_vcpu *vcpu) | |
1570 | { | |
1571 | u32 guest_tr_ar; | |
1572 | ||
1573 | guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES); | |
1574 | if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) { | |
1575 | printk(KERN_DEBUG "%s: tss fixup for long mode. \n", | |
1576 | __func__); | |
1577 | vmcs_write32(GUEST_TR_AR_BYTES, | |
1578 | (guest_tr_ar & ~AR_TYPE_MASK) | |
1579 | | AR_TYPE_BUSY_64_TSS); | |
1580 | } | |
1581 | vcpu->arch.shadow_efer |= EFER_LMA; | |
1582 | vmx_set_efer(vcpu, vcpu->arch.shadow_efer); | |
1583 | } | |
1584 | ||
1585 | static void exit_lmode(struct kvm_vcpu *vcpu) | |
1586 | { | |
1587 | vcpu->arch.shadow_efer &= ~EFER_LMA; | |
1588 | ||
1589 | vmcs_write32(VM_ENTRY_CONTROLS, | |
1590 | vmcs_read32(VM_ENTRY_CONTROLS) | |
1591 | & ~VM_ENTRY_IA32E_MODE); | |
1592 | } | |
1593 | ||
1594 | #endif | |
1595 | ||
1596 | static void vmx_flush_tlb(struct kvm_vcpu *vcpu) | |
1597 | { | |
1598 | vpid_sync_vcpu_all(to_vmx(vcpu)); | |
1599 | if (enable_ept) | |
1600 | ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa)); | |
1601 | } | |
1602 | ||
1603 | static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu) | |
1604 | { | |
1605 | vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK; | |
1606 | vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK; | |
1607 | } | |
1608 | ||
1609 | static void ept_load_pdptrs(struct kvm_vcpu *vcpu) | |
1610 | { | |
1611 | if (!test_bit(VCPU_EXREG_PDPTR, | |
1612 | (unsigned long *)&vcpu->arch.regs_dirty)) | |
1613 | return; | |
1614 | ||
1615 | if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { | |
1616 | vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]); | |
1617 | vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]); | |
1618 | vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]); | |
1619 | vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]); | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | static void ept_save_pdptrs(struct kvm_vcpu *vcpu) | |
1624 | { | |
1625 | if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) { | |
1626 | vcpu->arch.pdptrs[0] = vmcs_read64(GUEST_PDPTR0); | |
1627 | vcpu->arch.pdptrs[1] = vmcs_read64(GUEST_PDPTR1); | |
1628 | vcpu->arch.pdptrs[2] = vmcs_read64(GUEST_PDPTR2); | |
1629 | vcpu->arch.pdptrs[3] = vmcs_read64(GUEST_PDPTR3); | |
1630 | } | |
1631 | ||
1632 | __set_bit(VCPU_EXREG_PDPTR, | |
1633 | (unsigned long *)&vcpu->arch.regs_avail); | |
1634 | __set_bit(VCPU_EXREG_PDPTR, | |
1635 | (unsigned long *)&vcpu->arch.regs_dirty); | |
1636 | } | |
1637 | ||
1638 | static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4); | |
1639 | ||
1640 | static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, | |
1641 | unsigned long cr0, | |
1642 | struct kvm_vcpu *vcpu) | |
1643 | { | |
1644 | if (!(cr0 & X86_CR0_PG)) { | |
1645 | /* From paging/starting to nonpaging */ | |
1646 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, | |
1647 | vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) | | |
1648 | (CPU_BASED_CR3_LOAD_EXITING | | |
1649 | CPU_BASED_CR3_STORE_EXITING)); | |
1650 | vcpu->arch.cr0 = cr0; | |
1651 | vmx_set_cr4(vcpu, vcpu->arch.cr4); | |
1652 | } else if (!is_paging(vcpu)) { | |
1653 | /* From nonpaging to paging */ | |
1654 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, | |
1655 | vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) & | |
1656 | ~(CPU_BASED_CR3_LOAD_EXITING | | |
1657 | CPU_BASED_CR3_STORE_EXITING)); | |
1658 | vcpu->arch.cr0 = cr0; | |
1659 | vmx_set_cr4(vcpu, vcpu->arch.cr4); | |
1660 | } | |
1661 | ||
1662 | if (!(cr0 & X86_CR0_WP)) | |
1663 | *hw_cr0 &= ~X86_CR0_WP; | |
1664 | } | |
1665 | ||
1666 | static void ept_update_paging_mode_cr4(unsigned long *hw_cr4, | |
1667 | struct kvm_vcpu *vcpu) | |
1668 | { | |
1669 | if (!is_paging(vcpu)) { | |
1670 | *hw_cr4 &= ~X86_CR4_PAE; | |
1671 | *hw_cr4 |= X86_CR4_PSE; | |
1672 | } else if (!(vcpu->arch.cr4 & X86_CR4_PAE)) | |
1673 | *hw_cr4 &= ~X86_CR4_PAE; | |
1674 | } | |
1675 | ||
1676 | static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) | |
1677 | { | |
1678 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1679 | unsigned long hw_cr0; | |
1680 | ||
1681 | if (enable_unrestricted_guest) | |
1682 | hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST) | |
1683 | | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST; | |
1684 | else | |
1685 | hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON; | |
1686 | ||
1687 | vmx_fpu_deactivate(vcpu); | |
1688 | ||
1689 | if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE)) | |
1690 | enter_pmode(vcpu); | |
1691 | ||
1692 | if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE)) | |
1693 | enter_rmode(vcpu); | |
1694 | ||
1695 | #ifdef CONFIG_X86_64 | |
1696 | if (vcpu->arch.shadow_efer & EFER_LME) { | |
1697 | if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) | |
1698 | enter_lmode(vcpu); | |
1699 | if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) | |
1700 | exit_lmode(vcpu); | |
1701 | } | |
1702 | #endif | |
1703 | ||
1704 | if (enable_ept) | |
1705 | ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); | |
1706 | ||
1707 | vmcs_writel(CR0_READ_SHADOW, cr0); | |
1708 | vmcs_writel(GUEST_CR0, hw_cr0); | |
1709 | vcpu->arch.cr0 = cr0; | |
1710 | ||
1711 | if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE)) | |
1712 | vmx_fpu_activate(vcpu); | |
1713 | } | |
1714 | ||
1715 | static u64 construct_eptp(unsigned long root_hpa) | |
1716 | { | |
1717 | u64 eptp; | |
1718 | ||
1719 | /* TODO write the value reading from MSR */ | |
1720 | eptp = VMX_EPT_DEFAULT_MT | | |
1721 | VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT; | |
1722 | eptp |= (root_hpa & PAGE_MASK); | |
1723 | ||
1724 | return eptp; | |
1725 | } | |
1726 | ||
1727 | static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) | |
1728 | { | |
1729 | unsigned long guest_cr3; | |
1730 | u64 eptp; | |
1731 | ||
1732 | guest_cr3 = cr3; | |
1733 | if (enable_ept) { | |
1734 | eptp = construct_eptp(cr3); | |
1735 | vmcs_write64(EPT_POINTER, eptp); | |
1736 | guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 : | |
1737 | vcpu->kvm->arch.ept_identity_map_addr; | |
1738 | ept_load_pdptrs(vcpu); | |
1739 | } | |
1740 | ||
1741 | vmx_flush_tlb(vcpu); | |
1742 | vmcs_writel(GUEST_CR3, guest_cr3); | |
1743 | if (vcpu->arch.cr0 & X86_CR0_PE) | |
1744 | vmx_fpu_deactivate(vcpu); | |
1745 | } | |
1746 | ||
1747 | static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) | |
1748 | { | |
1749 | unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ? | |
1750 | KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON); | |
1751 | ||
1752 | vcpu->arch.cr4 = cr4; | |
1753 | if (enable_ept) | |
1754 | ept_update_paging_mode_cr4(&hw_cr4, vcpu); | |
1755 | ||
1756 | vmcs_writel(CR4_READ_SHADOW, cr4); | |
1757 | vmcs_writel(GUEST_CR4, hw_cr4); | |
1758 | } | |
1759 | ||
1760 | static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg) | |
1761 | { | |
1762 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
1763 | ||
1764 | return vmcs_readl(sf->base); | |
1765 | } | |
1766 | ||
1767 | static void vmx_get_segment(struct kvm_vcpu *vcpu, | |
1768 | struct kvm_segment *var, int seg) | |
1769 | { | |
1770 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
1771 | u32 ar; | |
1772 | ||
1773 | var->base = vmcs_readl(sf->base); | |
1774 | var->limit = vmcs_read32(sf->limit); | |
1775 | var->selector = vmcs_read16(sf->selector); | |
1776 | ar = vmcs_read32(sf->ar_bytes); | |
1777 | if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state) | |
1778 | ar = 0; | |
1779 | var->type = ar & 15; | |
1780 | var->s = (ar >> 4) & 1; | |
1781 | var->dpl = (ar >> 5) & 3; | |
1782 | var->present = (ar >> 7) & 1; | |
1783 | var->avl = (ar >> 12) & 1; | |
1784 | var->l = (ar >> 13) & 1; | |
1785 | var->db = (ar >> 14) & 1; | |
1786 | var->g = (ar >> 15) & 1; | |
1787 | var->unusable = (ar >> 16) & 1; | |
1788 | } | |
1789 | ||
1790 | static int vmx_get_cpl(struct kvm_vcpu *vcpu) | |
1791 | { | |
1792 | if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */ | |
1793 | return 0; | |
1794 | ||
1795 | if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */ | |
1796 | return 3; | |
1797 | ||
1798 | return vmcs_read16(GUEST_CS_SELECTOR) & 3; | |
1799 | } | |
1800 | ||
1801 | static u32 vmx_segment_access_rights(struct kvm_segment *var) | |
1802 | { | |
1803 | u32 ar; | |
1804 | ||
1805 | if (var->unusable) | |
1806 | ar = 1 << 16; | |
1807 | else { | |
1808 | ar = var->type & 15; | |
1809 | ar |= (var->s & 1) << 4; | |
1810 | ar |= (var->dpl & 3) << 5; | |
1811 | ar |= (var->present & 1) << 7; | |
1812 | ar |= (var->avl & 1) << 12; | |
1813 | ar |= (var->l & 1) << 13; | |
1814 | ar |= (var->db & 1) << 14; | |
1815 | ar |= (var->g & 1) << 15; | |
1816 | } | |
1817 | if (ar == 0) /* a 0 value means unusable */ | |
1818 | ar = AR_UNUSABLE_MASK; | |
1819 | ||
1820 | return ar; | |
1821 | } | |
1822 | ||
1823 | static void vmx_set_segment(struct kvm_vcpu *vcpu, | |
1824 | struct kvm_segment *var, int seg) | |
1825 | { | |
1826 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
1827 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
1828 | u32 ar; | |
1829 | ||
1830 | if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) { | |
1831 | vmx->rmode.tr.selector = var->selector; | |
1832 | vmx->rmode.tr.base = var->base; | |
1833 | vmx->rmode.tr.limit = var->limit; | |
1834 | vmx->rmode.tr.ar = vmx_segment_access_rights(var); | |
1835 | return; | |
1836 | } | |
1837 | vmcs_writel(sf->base, var->base); | |
1838 | vmcs_write32(sf->limit, var->limit); | |
1839 | vmcs_write16(sf->selector, var->selector); | |
1840 | if (vmx->rmode.vm86_active && var->s) { | |
1841 | /* | |
1842 | * Hack real-mode segments into vm86 compatibility. | |
1843 | */ | |
1844 | if (var->base == 0xffff0000 && var->selector == 0xf000) | |
1845 | vmcs_writel(sf->base, 0xf0000); | |
1846 | ar = 0xf3; | |
1847 | } else | |
1848 | ar = vmx_segment_access_rights(var); | |
1849 | ||
1850 | /* | |
1851 | * Fix the "Accessed" bit in AR field of segment registers for older | |
1852 | * qemu binaries. | |
1853 | * IA32 arch specifies that at the time of processor reset the | |
1854 | * "Accessed" bit in the AR field of segment registers is 1. And qemu | |
1855 | * is setting it to 0 in the usedland code. This causes invalid guest | |
1856 | * state vmexit when "unrestricted guest" mode is turned on. | |
1857 | * Fix for this setup issue in cpu_reset is being pushed in the qemu | |
1858 | * tree. Newer qemu binaries with that qemu fix would not need this | |
1859 | * kvm hack. | |
1860 | */ | |
1861 | if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR)) | |
1862 | ar |= 0x1; /* Accessed */ | |
1863 | ||
1864 | vmcs_write32(sf->ar_bytes, ar); | |
1865 | } | |
1866 | ||
1867 | static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) | |
1868 | { | |
1869 | u32 ar = vmcs_read32(GUEST_CS_AR_BYTES); | |
1870 | ||
1871 | *db = (ar >> 14) & 1; | |
1872 | *l = (ar >> 13) & 1; | |
1873 | } | |
1874 | ||
1875 | static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) | |
1876 | { | |
1877 | dt->limit = vmcs_read32(GUEST_IDTR_LIMIT); | |
1878 | dt->base = vmcs_readl(GUEST_IDTR_BASE); | |
1879 | } | |
1880 | ||
1881 | static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) | |
1882 | { | |
1883 | vmcs_write32(GUEST_IDTR_LIMIT, dt->limit); | |
1884 | vmcs_writel(GUEST_IDTR_BASE, dt->base); | |
1885 | } | |
1886 | ||
1887 | static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) | |
1888 | { | |
1889 | dt->limit = vmcs_read32(GUEST_GDTR_LIMIT); | |
1890 | dt->base = vmcs_readl(GUEST_GDTR_BASE); | |
1891 | } | |
1892 | ||
1893 | static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt) | |
1894 | { | |
1895 | vmcs_write32(GUEST_GDTR_LIMIT, dt->limit); | |
1896 | vmcs_writel(GUEST_GDTR_BASE, dt->base); | |
1897 | } | |
1898 | ||
1899 | static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) | |
1900 | { | |
1901 | struct kvm_segment var; | |
1902 | u32 ar; | |
1903 | ||
1904 | vmx_get_segment(vcpu, &var, seg); | |
1905 | ar = vmx_segment_access_rights(&var); | |
1906 | ||
1907 | if (var.base != (var.selector << 4)) | |
1908 | return false; | |
1909 | if (var.limit != 0xffff) | |
1910 | return false; | |
1911 | if (ar != 0xf3) | |
1912 | return false; | |
1913 | ||
1914 | return true; | |
1915 | } | |
1916 | ||
1917 | static bool code_segment_valid(struct kvm_vcpu *vcpu) | |
1918 | { | |
1919 | struct kvm_segment cs; | |
1920 | unsigned int cs_rpl; | |
1921 | ||
1922 | vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); | |
1923 | cs_rpl = cs.selector & SELECTOR_RPL_MASK; | |
1924 | ||
1925 | if (cs.unusable) | |
1926 | return false; | |
1927 | if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK)) | |
1928 | return false; | |
1929 | if (!cs.s) | |
1930 | return false; | |
1931 | if (cs.type & AR_TYPE_WRITEABLE_MASK) { | |
1932 | if (cs.dpl > cs_rpl) | |
1933 | return false; | |
1934 | } else { | |
1935 | if (cs.dpl != cs_rpl) | |
1936 | return false; | |
1937 | } | |
1938 | if (!cs.present) | |
1939 | return false; | |
1940 | ||
1941 | /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */ | |
1942 | return true; | |
1943 | } | |
1944 | ||
1945 | static bool stack_segment_valid(struct kvm_vcpu *vcpu) | |
1946 | { | |
1947 | struct kvm_segment ss; | |
1948 | unsigned int ss_rpl; | |
1949 | ||
1950 | vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); | |
1951 | ss_rpl = ss.selector & SELECTOR_RPL_MASK; | |
1952 | ||
1953 | if (ss.unusable) | |
1954 | return true; | |
1955 | if (ss.type != 3 && ss.type != 7) | |
1956 | return false; | |
1957 | if (!ss.s) | |
1958 | return false; | |
1959 | if (ss.dpl != ss_rpl) /* DPL != RPL */ | |
1960 | return false; | |
1961 | if (!ss.present) | |
1962 | return false; | |
1963 | ||
1964 | return true; | |
1965 | } | |
1966 | ||
1967 | static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg) | |
1968 | { | |
1969 | struct kvm_segment var; | |
1970 | unsigned int rpl; | |
1971 | ||
1972 | vmx_get_segment(vcpu, &var, seg); | |
1973 | rpl = var.selector & SELECTOR_RPL_MASK; | |
1974 | ||
1975 | if (var.unusable) | |
1976 | return true; | |
1977 | if (!var.s) | |
1978 | return false; | |
1979 | if (!var.present) | |
1980 | return false; | |
1981 | if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) { | |
1982 | if (var.dpl < rpl) /* DPL < RPL */ | |
1983 | return false; | |
1984 | } | |
1985 | ||
1986 | /* TODO: Add other members to kvm_segment_field to allow checking for other access | |
1987 | * rights flags | |
1988 | */ | |
1989 | return true; | |
1990 | } | |
1991 | ||
1992 | static bool tr_valid(struct kvm_vcpu *vcpu) | |
1993 | { | |
1994 | struct kvm_segment tr; | |
1995 | ||
1996 | vmx_get_segment(vcpu, &tr, VCPU_SREG_TR); | |
1997 | ||
1998 | if (tr.unusable) | |
1999 | return false; | |
2000 | if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */ | |
2001 | return false; | |
2002 | if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */ | |
2003 | return false; | |
2004 | if (!tr.present) | |
2005 | return false; | |
2006 | ||
2007 | return true; | |
2008 | } | |
2009 | ||
2010 | static bool ldtr_valid(struct kvm_vcpu *vcpu) | |
2011 | { | |
2012 | struct kvm_segment ldtr; | |
2013 | ||
2014 | vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR); | |
2015 | ||
2016 | if (ldtr.unusable) | |
2017 | return true; | |
2018 | if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */ | |
2019 | return false; | |
2020 | if (ldtr.type != 2) | |
2021 | return false; | |
2022 | if (!ldtr.present) | |
2023 | return false; | |
2024 | ||
2025 | return true; | |
2026 | } | |
2027 | ||
2028 | static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu) | |
2029 | { | |
2030 | struct kvm_segment cs, ss; | |
2031 | ||
2032 | vmx_get_segment(vcpu, &cs, VCPU_SREG_CS); | |
2033 | vmx_get_segment(vcpu, &ss, VCPU_SREG_SS); | |
2034 | ||
2035 | return ((cs.selector & SELECTOR_RPL_MASK) == | |
2036 | (ss.selector & SELECTOR_RPL_MASK)); | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * Check if guest state is valid. Returns true if valid, false if | |
2041 | * not. | |
2042 | * We assume that registers are always usable | |
2043 | */ | |
2044 | static bool guest_state_valid(struct kvm_vcpu *vcpu) | |
2045 | { | |
2046 | /* real mode guest state checks */ | |
2047 | if (!(vcpu->arch.cr0 & X86_CR0_PE)) { | |
2048 | if (!rmode_segment_valid(vcpu, VCPU_SREG_CS)) | |
2049 | return false; | |
2050 | if (!rmode_segment_valid(vcpu, VCPU_SREG_SS)) | |
2051 | return false; | |
2052 | if (!rmode_segment_valid(vcpu, VCPU_SREG_DS)) | |
2053 | return false; | |
2054 | if (!rmode_segment_valid(vcpu, VCPU_SREG_ES)) | |
2055 | return false; | |
2056 | if (!rmode_segment_valid(vcpu, VCPU_SREG_FS)) | |
2057 | return false; | |
2058 | if (!rmode_segment_valid(vcpu, VCPU_SREG_GS)) | |
2059 | return false; | |
2060 | } else { | |
2061 | /* protected mode guest state checks */ | |
2062 | if (!cs_ss_rpl_check(vcpu)) | |
2063 | return false; | |
2064 | if (!code_segment_valid(vcpu)) | |
2065 | return false; | |
2066 | if (!stack_segment_valid(vcpu)) | |
2067 | return false; | |
2068 | if (!data_segment_valid(vcpu, VCPU_SREG_DS)) | |
2069 | return false; | |
2070 | if (!data_segment_valid(vcpu, VCPU_SREG_ES)) | |
2071 | return false; | |
2072 | if (!data_segment_valid(vcpu, VCPU_SREG_FS)) | |
2073 | return false; | |
2074 | if (!data_segment_valid(vcpu, VCPU_SREG_GS)) | |
2075 | return false; | |
2076 | if (!tr_valid(vcpu)) | |
2077 | return false; | |
2078 | if (!ldtr_valid(vcpu)) | |
2079 | return false; | |
2080 | } | |
2081 | /* TODO: | |
2082 | * - Add checks on RIP | |
2083 | * - Add checks on RFLAGS | |
2084 | */ | |
2085 | ||
2086 | return true; | |
2087 | } | |
2088 | ||
2089 | static int init_rmode_tss(struct kvm *kvm) | |
2090 | { | |
2091 | gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT; | |
2092 | u16 data = 0; | |
2093 | int ret = 0; | |
2094 | int r; | |
2095 | ||
2096 | r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); | |
2097 | if (r < 0) | |
2098 | goto out; | |
2099 | data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; | |
2100 | r = kvm_write_guest_page(kvm, fn++, &data, | |
2101 | TSS_IOPB_BASE_OFFSET, sizeof(u16)); | |
2102 | if (r < 0) | |
2103 | goto out; | |
2104 | r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); | |
2105 | if (r < 0) | |
2106 | goto out; | |
2107 | r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); | |
2108 | if (r < 0) | |
2109 | goto out; | |
2110 | data = ~0; | |
2111 | r = kvm_write_guest_page(kvm, fn, &data, | |
2112 | RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, | |
2113 | sizeof(u8)); | |
2114 | if (r < 0) | |
2115 | goto out; | |
2116 | ||
2117 | ret = 1; | |
2118 | out: | |
2119 | return ret; | |
2120 | } | |
2121 | ||
2122 | static int init_rmode_identity_map(struct kvm *kvm) | |
2123 | { | |
2124 | int i, r, ret; | |
2125 | pfn_t identity_map_pfn; | |
2126 | u32 tmp; | |
2127 | ||
2128 | if (!enable_ept) | |
2129 | return 1; | |
2130 | if (unlikely(!kvm->arch.ept_identity_pagetable)) { | |
2131 | printk(KERN_ERR "EPT: identity-mapping pagetable " | |
2132 | "haven't been allocated!\n"); | |
2133 | return 0; | |
2134 | } | |
2135 | if (likely(kvm->arch.ept_identity_pagetable_done)) | |
2136 | return 1; | |
2137 | ret = 0; | |
2138 | identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT; | |
2139 | r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); | |
2140 | if (r < 0) | |
2141 | goto out; | |
2142 | /* Set up identity-mapping pagetable for EPT in real mode */ | |
2143 | for (i = 0; i < PT32_ENT_PER_PAGE; i++) { | |
2144 | tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | | |
2145 | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); | |
2146 | r = kvm_write_guest_page(kvm, identity_map_pfn, | |
2147 | &tmp, i * sizeof(tmp), sizeof(tmp)); | |
2148 | if (r < 0) | |
2149 | goto out; | |
2150 | } | |
2151 | kvm->arch.ept_identity_pagetable_done = true; | |
2152 | ret = 1; | |
2153 | out: | |
2154 | return ret; | |
2155 | } | |
2156 | ||
2157 | static void seg_setup(int seg) | |
2158 | { | |
2159 | struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg]; | |
2160 | unsigned int ar; | |
2161 | ||
2162 | vmcs_write16(sf->selector, 0); | |
2163 | vmcs_writel(sf->base, 0); | |
2164 | vmcs_write32(sf->limit, 0xffff); | |
2165 | if (enable_unrestricted_guest) { | |
2166 | ar = 0x93; | |
2167 | if (seg == VCPU_SREG_CS) | |
2168 | ar |= 0x08; /* code segment */ | |
2169 | } else | |
2170 | ar = 0xf3; | |
2171 | ||
2172 | vmcs_write32(sf->ar_bytes, ar); | |
2173 | } | |
2174 | ||
2175 | static int alloc_apic_access_page(struct kvm *kvm) | |
2176 | { | |
2177 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2178 | int r = 0; | |
2179 | ||
2180 | down_write(&kvm->slots_lock); | |
2181 | if (kvm->arch.apic_access_page) | |
2182 | goto out; | |
2183 | kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT; | |
2184 | kvm_userspace_mem.flags = 0; | |
2185 | kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL; | |
2186 | kvm_userspace_mem.memory_size = PAGE_SIZE; | |
2187 | r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); | |
2188 | if (r) | |
2189 | goto out; | |
2190 | ||
2191 | kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00); | |
2192 | out: | |
2193 | up_write(&kvm->slots_lock); | |
2194 | return r; | |
2195 | } | |
2196 | ||
2197 | static int alloc_identity_pagetable(struct kvm *kvm) | |
2198 | { | |
2199 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2200 | int r = 0; | |
2201 | ||
2202 | down_write(&kvm->slots_lock); | |
2203 | if (kvm->arch.ept_identity_pagetable) | |
2204 | goto out; | |
2205 | kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT; | |
2206 | kvm_userspace_mem.flags = 0; | |
2207 | kvm_userspace_mem.guest_phys_addr = | |
2208 | kvm->arch.ept_identity_map_addr; | |
2209 | kvm_userspace_mem.memory_size = PAGE_SIZE; | |
2210 | r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); | |
2211 | if (r) | |
2212 | goto out; | |
2213 | ||
2214 | kvm->arch.ept_identity_pagetable = gfn_to_page(kvm, | |
2215 | kvm->arch.ept_identity_map_addr >> PAGE_SHIFT); | |
2216 | out: | |
2217 | up_write(&kvm->slots_lock); | |
2218 | return r; | |
2219 | } | |
2220 | ||
2221 | static void allocate_vpid(struct vcpu_vmx *vmx) | |
2222 | { | |
2223 | int vpid; | |
2224 | ||
2225 | vmx->vpid = 0; | |
2226 | if (!enable_vpid) | |
2227 | return; | |
2228 | spin_lock(&vmx_vpid_lock); | |
2229 | vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS); | |
2230 | if (vpid < VMX_NR_VPIDS) { | |
2231 | vmx->vpid = vpid; | |
2232 | __set_bit(vpid, vmx_vpid_bitmap); | |
2233 | } | |
2234 | spin_unlock(&vmx_vpid_lock); | |
2235 | } | |
2236 | ||
2237 | static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr) | |
2238 | { | |
2239 | int f = sizeof(unsigned long); | |
2240 | ||
2241 | if (!cpu_has_vmx_msr_bitmap()) | |
2242 | return; | |
2243 | ||
2244 | /* | |
2245 | * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals | |
2246 | * have the write-low and read-high bitmap offsets the wrong way round. | |
2247 | * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff. | |
2248 | */ | |
2249 | if (msr <= 0x1fff) { | |
2250 | __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */ | |
2251 | __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */ | |
2252 | } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) { | |
2253 | msr &= 0x1fff; | |
2254 | __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */ | |
2255 | __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */ | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only) | |
2260 | { | |
2261 | if (!longmode_only) | |
2262 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr); | |
2263 | __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr); | |
2264 | } | |
2265 | ||
2266 | /* | |
2267 | * Sets up the vmcs for emulated real mode. | |
2268 | */ | |
2269 | static int vmx_vcpu_setup(struct vcpu_vmx *vmx) | |
2270 | { | |
2271 | u32 host_sysenter_cs, msr_low, msr_high; | |
2272 | u32 junk; | |
2273 | u64 host_pat, tsc_this, tsc_base; | |
2274 | unsigned long a; | |
2275 | struct descriptor_table dt; | |
2276 | int i; | |
2277 | unsigned long kvm_vmx_return; | |
2278 | u32 exec_control; | |
2279 | ||
2280 | /* I/O */ | |
2281 | vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a)); | |
2282 | vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b)); | |
2283 | ||
2284 | if (cpu_has_vmx_msr_bitmap()) | |
2285 | vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy)); | |
2286 | ||
2287 | vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */ | |
2288 | ||
2289 | /* Control */ | |
2290 | vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, | |
2291 | vmcs_config.pin_based_exec_ctrl); | |
2292 | ||
2293 | exec_control = vmcs_config.cpu_based_exec_ctrl; | |
2294 | if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) { | |
2295 | exec_control &= ~CPU_BASED_TPR_SHADOW; | |
2296 | #ifdef CONFIG_X86_64 | |
2297 | exec_control |= CPU_BASED_CR8_STORE_EXITING | | |
2298 | CPU_BASED_CR8_LOAD_EXITING; | |
2299 | #endif | |
2300 | } | |
2301 | if (!enable_ept) | |
2302 | exec_control |= CPU_BASED_CR3_STORE_EXITING | | |
2303 | CPU_BASED_CR3_LOAD_EXITING | | |
2304 | CPU_BASED_INVLPG_EXITING; | |
2305 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control); | |
2306 | ||
2307 | if (cpu_has_secondary_exec_ctrls()) { | |
2308 | exec_control = vmcs_config.cpu_based_2nd_exec_ctrl; | |
2309 | if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) | |
2310 | exec_control &= | |
2311 | ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES; | |
2312 | if (vmx->vpid == 0) | |
2313 | exec_control &= ~SECONDARY_EXEC_ENABLE_VPID; | |
2314 | if (!enable_ept) { | |
2315 | exec_control &= ~SECONDARY_EXEC_ENABLE_EPT; | |
2316 | enable_unrestricted_guest = 0; | |
2317 | } | |
2318 | if (!enable_unrestricted_guest) | |
2319 | exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST; | |
2320 | if (!ple_gap) | |
2321 | exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING; | |
2322 | vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control); | |
2323 | } | |
2324 | ||
2325 | if (ple_gap) { | |
2326 | vmcs_write32(PLE_GAP, ple_gap); | |
2327 | vmcs_write32(PLE_WINDOW, ple_window); | |
2328 | } | |
2329 | ||
2330 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf); | |
2331 | vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf); | |
2332 | vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */ | |
2333 | ||
2334 | vmcs_writel(HOST_CR0, read_cr0()); /* 22.2.3 */ | |
2335 | vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */ | |
2336 | vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */ | |
2337 | ||
2338 | vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */ | |
2339 | vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ | |
2340 | vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */ | |
2341 | vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs()); /* 22.2.4 */ | |
2342 | vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs()); /* 22.2.4 */ | |
2343 | vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */ | |
2344 | #ifdef CONFIG_X86_64 | |
2345 | rdmsrl(MSR_FS_BASE, a); | |
2346 | vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */ | |
2347 | rdmsrl(MSR_GS_BASE, a); | |
2348 | vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */ | |
2349 | #else | |
2350 | vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */ | |
2351 | vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */ | |
2352 | #endif | |
2353 | ||
2354 | vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */ | |
2355 | ||
2356 | kvm_get_idt(&dt); | |
2357 | vmcs_writel(HOST_IDTR_BASE, dt.base); /* 22.2.4 */ | |
2358 | ||
2359 | asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return)); | |
2360 | vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */ | |
2361 | vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0); | |
2362 | vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0); | |
2363 | vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0); | |
2364 | ||
2365 | rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk); | |
2366 | vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs); | |
2367 | rdmsrl(MSR_IA32_SYSENTER_ESP, a); | |
2368 | vmcs_writel(HOST_IA32_SYSENTER_ESP, a); /* 22.2.3 */ | |
2369 | rdmsrl(MSR_IA32_SYSENTER_EIP, a); | |
2370 | vmcs_writel(HOST_IA32_SYSENTER_EIP, a); /* 22.2.3 */ | |
2371 | ||
2372 | if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) { | |
2373 | rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high); | |
2374 | host_pat = msr_low | ((u64) msr_high << 32); | |
2375 | vmcs_write64(HOST_IA32_PAT, host_pat); | |
2376 | } | |
2377 | if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { | |
2378 | rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high); | |
2379 | host_pat = msr_low | ((u64) msr_high << 32); | |
2380 | /* Write the default value follow host pat */ | |
2381 | vmcs_write64(GUEST_IA32_PAT, host_pat); | |
2382 | /* Keep arch.pat sync with GUEST_IA32_PAT */ | |
2383 | vmx->vcpu.arch.pat = host_pat; | |
2384 | } | |
2385 | ||
2386 | for (i = 0; i < NR_VMX_MSR; ++i) { | |
2387 | u32 index = vmx_msr_index[i]; | |
2388 | u32 data_low, data_high; | |
2389 | u64 data; | |
2390 | int j = vmx->nmsrs; | |
2391 | ||
2392 | if (rdmsr_safe(index, &data_low, &data_high) < 0) | |
2393 | continue; | |
2394 | if (wrmsr_safe(index, data_low, data_high) < 0) | |
2395 | continue; | |
2396 | data = data_low | ((u64)data_high << 32); | |
2397 | vmx->guest_msrs[j].index = i; | |
2398 | vmx->guest_msrs[j].data = 0; | |
2399 | vmx->guest_msrs[j].mask = -1ull; | |
2400 | ++vmx->nmsrs; | |
2401 | } | |
2402 | ||
2403 | vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl); | |
2404 | ||
2405 | /* 22.2.1, 20.8.1 */ | |
2406 | vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl); | |
2407 | ||
2408 | vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL); | |
2409 | vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK); | |
2410 | ||
2411 | tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc; | |
2412 | rdtscll(tsc_this); | |
2413 | if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc) | |
2414 | tsc_base = tsc_this; | |
2415 | ||
2416 | guest_write_tsc(0, tsc_base); | |
2417 | ||
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | static int init_rmode(struct kvm *kvm) | |
2422 | { | |
2423 | if (!init_rmode_tss(kvm)) | |
2424 | return 0; | |
2425 | if (!init_rmode_identity_map(kvm)) | |
2426 | return 0; | |
2427 | return 1; | |
2428 | } | |
2429 | ||
2430 | static int vmx_vcpu_reset(struct kvm_vcpu *vcpu) | |
2431 | { | |
2432 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2433 | u64 msr; | |
2434 | int ret; | |
2435 | ||
2436 | vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)); | |
2437 | down_read(&vcpu->kvm->slots_lock); | |
2438 | if (!init_rmode(vmx->vcpu.kvm)) { | |
2439 | ret = -ENOMEM; | |
2440 | goto out; | |
2441 | } | |
2442 | ||
2443 | vmx->rmode.vm86_active = 0; | |
2444 | ||
2445 | vmx->soft_vnmi_blocked = 0; | |
2446 | ||
2447 | vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val(); | |
2448 | kvm_set_cr8(&vmx->vcpu, 0); | |
2449 | msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE; | |
2450 | if (kvm_vcpu_is_bsp(&vmx->vcpu)) | |
2451 | msr |= MSR_IA32_APICBASE_BSP; | |
2452 | kvm_set_apic_base(&vmx->vcpu, msr); | |
2453 | ||
2454 | fx_init(&vmx->vcpu); | |
2455 | ||
2456 | seg_setup(VCPU_SREG_CS); | |
2457 | /* | |
2458 | * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode | |
2459 | * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh. | |
2460 | */ | |
2461 | if (kvm_vcpu_is_bsp(&vmx->vcpu)) { | |
2462 | vmcs_write16(GUEST_CS_SELECTOR, 0xf000); | |
2463 | vmcs_writel(GUEST_CS_BASE, 0x000f0000); | |
2464 | } else { | |
2465 | vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8); | |
2466 | vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12); | |
2467 | } | |
2468 | ||
2469 | seg_setup(VCPU_SREG_DS); | |
2470 | seg_setup(VCPU_SREG_ES); | |
2471 | seg_setup(VCPU_SREG_FS); | |
2472 | seg_setup(VCPU_SREG_GS); | |
2473 | seg_setup(VCPU_SREG_SS); | |
2474 | ||
2475 | vmcs_write16(GUEST_TR_SELECTOR, 0); | |
2476 | vmcs_writel(GUEST_TR_BASE, 0); | |
2477 | vmcs_write32(GUEST_TR_LIMIT, 0xffff); | |
2478 | vmcs_write32(GUEST_TR_AR_BYTES, 0x008b); | |
2479 | ||
2480 | vmcs_write16(GUEST_LDTR_SELECTOR, 0); | |
2481 | vmcs_writel(GUEST_LDTR_BASE, 0); | |
2482 | vmcs_write32(GUEST_LDTR_LIMIT, 0xffff); | |
2483 | vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082); | |
2484 | ||
2485 | vmcs_write32(GUEST_SYSENTER_CS, 0); | |
2486 | vmcs_writel(GUEST_SYSENTER_ESP, 0); | |
2487 | vmcs_writel(GUEST_SYSENTER_EIP, 0); | |
2488 | ||
2489 | vmcs_writel(GUEST_RFLAGS, 0x02); | |
2490 | if (kvm_vcpu_is_bsp(&vmx->vcpu)) | |
2491 | kvm_rip_write(vcpu, 0xfff0); | |
2492 | else | |
2493 | kvm_rip_write(vcpu, 0); | |
2494 | kvm_register_write(vcpu, VCPU_REGS_RSP, 0); | |
2495 | ||
2496 | vmcs_writel(GUEST_DR7, 0x400); | |
2497 | ||
2498 | vmcs_writel(GUEST_GDTR_BASE, 0); | |
2499 | vmcs_write32(GUEST_GDTR_LIMIT, 0xffff); | |
2500 | ||
2501 | vmcs_writel(GUEST_IDTR_BASE, 0); | |
2502 | vmcs_write32(GUEST_IDTR_LIMIT, 0xffff); | |
2503 | ||
2504 | vmcs_write32(GUEST_ACTIVITY_STATE, 0); | |
2505 | vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0); | |
2506 | vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0); | |
2507 | ||
2508 | /* Special registers */ | |
2509 | vmcs_write64(GUEST_IA32_DEBUGCTL, 0); | |
2510 | ||
2511 | setup_msrs(vmx); | |
2512 | ||
2513 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ | |
2514 | ||
2515 | if (cpu_has_vmx_tpr_shadow()) { | |
2516 | vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); | |
2517 | if (vm_need_tpr_shadow(vmx->vcpu.kvm)) | |
2518 | vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, | |
2519 | page_to_phys(vmx->vcpu.arch.apic->regs_page)); | |
2520 | vmcs_write32(TPR_THRESHOLD, 0); | |
2521 | } | |
2522 | ||
2523 | if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) | |
2524 | vmcs_write64(APIC_ACCESS_ADDR, | |
2525 | page_to_phys(vmx->vcpu.kvm->arch.apic_access_page)); | |
2526 | ||
2527 | if (vmx->vpid != 0) | |
2528 | vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid); | |
2529 | ||
2530 | vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; | |
2531 | vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */ | |
2532 | vmx_set_cr4(&vmx->vcpu, 0); | |
2533 | vmx_set_efer(&vmx->vcpu, 0); | |
2534 | vmx_fpu_activate(&vmx->vcpu); | |
2535 | update_exception_bitmap(&vmx->vcpu); | |
2536 | ||
2537 | vpid_sync_vcpu_all(vmx); | |
2538 | ||
2539 | ret = 0; | |
2540 | ||
2541 | /* HACK: Don't enable emulation on guest boot/reset */ | |
2542 | vmx->emulation_required = 0; | |
2543 | ||
2544 | out: | |
2545 | up_read(&vcpu->kvm->slots_lock); | |
2546 | return ret; | |
2547 | } | |
2548 | ||
2549 | static void enable_irq_window(struct kvm_vcpu *vcpu) | |
2550 | { | |
2551 | u32 cpu_based_vm_exec_control; | |
2552 | ||
2553 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
2554 | cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING; | |
2555 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
2556 | } | |
2557 | ||
2558 | static void enable_nmi_window(struct kvm_vcpu *vcpu) | |
2559 | { | |
2560 | u32 cpu_based_vm_exec_control; | |
2561 | ||
2562 | if (!cpu_has_virtual_nmis()) { | |
2563 | enable_irq_window(vcpu); | |
2564 | return; | |
2565 | } | |
2566 | ||
2567 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
2568 | cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING; | |
2569 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
2570 | } | |
2571 | ||
2572 | static void vmx_inject_irq(struct kvm_vcpu *vcpu) | |
2573 | { | |
2574 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2575 | uint32_t intr; | |
2576 | int irq = vcpu->arch.interrupt.nr; | |
2577 | ||
2578 | trace_kvm_inj_virq(irq); | |
2579 | ||
2580 | ++vcpu->stat.irq_injections; | |
2581 | if (vmx->rmode.vm86_active) { | |
2582 | vmx->rmode.irq.pending = true; | |
2583 | vmx->rmode.irq.vector = irq; | |
2584 | vmx->rmode.irq.rip = kvm_rip_read(vcpu); | |
2585 | if (vcpu->arch.interrupt.soft) | |
2586 | vmx->rmode.irq.rip += | |
2587 | vmx->vcpu.arch.event_exit_inst_len; | |
2588 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, | |
2589 | irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK); | |
2590 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1); | |
2591 | kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1); | |
2592 | return; | |
2593 | } | |
2594 | intr = irq | INTR_INFO_VALID_MASK; | |
2595 | if (vcpu->arch.interrupt.soft) { | |
2596 | intr |= INTR_TYPE_SOFT_INTR; | |
2597 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, | |
2598 | vmx->vcpu.arch.event_exit_inst_len); | |
2599 | } else | |
2600 | intr |= INTR_TYPE_EXT_INTR; | |
2601 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr); | |
2602 | } | |
2603 | ||
2604 | static void vmx_inject_nmi(struct kvm_vcpu *vcpu) | |
2605 | { | |
2606 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2607 | ||
2608 | if (!cpu_has_virtual_nmis()) { | |
2609 | /* | |
2610 | * Tracking the NMI-blocked state in software is built upon | |
2611 | * finding the next open IRQ window. This, in turn, depends on | |
2612 | * well-behaving guests: They have to keep IRQs disabled at | |
2613 | * least as long as the NMI handler runs. Otherwise we may | |
2614 | * cause NMI nesting, maybe breaking the guest. But as this is | |
2615 | * highly unlikely, we can live with the residual risk. | |
2616 | */ | |
2617 | vmx->soft_vnmi_blocked = 1; | |
2618 | vmx->vnmi_blocked_time = 0; | |
2619 | } | |
2620 | ||
2621 | ++vcpu->stat.nmi_injections; | |
2622 | if (vmx->rmode.vm86_active) { | |
2623 | vmx->rmode.irq.pending = true; | |
2624 | vmx->rmode.irq.vector = NMI_VECTOR; | |
2625 | vmx->rmode.irq.rip = kvm_rip_read(vcpu); | |
2626 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, | |
2627 | NMI_VECTOR | INTR_TYPE_SOFT_INTR | | |
2628 | INTR_INFO_VALID_MASK); | |
2629 | vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1); | |
2630 | kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1); | |
2631 | return; | |
2632 | } | |
2633 | vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, | |
2634 | INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR); | |
2635 | } | |
2636 | ||
2637 | static int vmx_nmi_allowed(struct kvm_vcpu *vcpu) | |
2638 | { | |
2639 | if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked) | |
2640 | return 0; | |
2641 | ||
2642 | return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & | |
2643 | (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS | | |
2644 | GUEST_INTR_STATE_NMI)); | |
2645 | } | |
2646 | ||
2647 | static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu) | |
2648 | { | |
2649 | if (!cpu_has_virtual_nmis()) | |
2650 | return to_vmx(vcpu)->soft_vnmi_blocked; | |
2651 | else | |
2652 | return !!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & | |
2653 | GUEST_INTR_STATE_NMI); | |
2654 | } | |
2655 | ||
2656 | static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked) | |
2657 | { | |
2658 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2659 | ||
2660 | if (!cpu_has_virtual_nmis()) { | |
2661 | if (vmx->soft_vnmi_blocked != masked) { | |
2662 | vmx->soft_vnmi_blocked = masked; | |
2663 | vmx->vnmi_blocked_time = 0; | |
2664 | } | |
2665 | } else { | |
2666 | if (masked) | |
2667 | vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, | |
2668 | GUEST_INTR_STATE_NMI); | |
2669 | else | |
2670 | vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, | |
2671 | GUEST_INTR_STATE_NMI); | |
2672 | } | |
2673 | } | |
2674 | ||
2675 | static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu) | |
2676 | { | |
2677 | return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) && | |
2678 | !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & | |
2679 | (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)); | |
2680 | } | |
2681 | ||
2682 | static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) | |
2683 | { | |
2684 | int ret; | |
2685 | struct kvm_userspace_memory_region tss_mem = { | |
2686 | .slot = TSS_PRIVATE_MEMSLOT, | |
2687 | .guest_phys_addr = addr, | |
2688 | .memory_size = PAGE_SIZE * 3, | |
2689 | .flags = 0, | |
2690 | }; | |
2691 | ||
2692 | ret = kvm_set_memory_region(kvm, &tss_mem, 0); | |
2693 | if (ret) | |
2694 | return ret; | |
2695 | kvm->arch.tss_addr = addr; | |
2696 | return 0; | |
2697 | } | |
2698 | ||
2699 | static int handle_rmode_exception(struct kvm_vcpu *vcpu, | |
2700 | int vec, u32 err_code) | |
2701 | { | |
2702 | /* | |
2703 | * Instruction with address size override prefix opcode 0x67 | |
2704 | * Cause the #SS fault with 0 error code in VM86 mode. | |
2705 | */ | |
2706 | if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0) | |
2707 | if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE) | |
2708 | return 1; | |
2709 | /* | |
2710 | * Forward all other exceptions that are valid in real mode. | |
2711 | * FIXME: Breaks guest debugging in real mode, needs to be fixed with | |
2712 | * the required debugging infrastructure rework. | |
2713 | */ | |
2714 | switch (vec) { | |
2715 | case DB_VECTOR: | |
2716 | if (vcpu->guest_debug & | |
2717 | (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) | |
2718 | return 0; | |
2719 | kvm_queue_exception(vcpu, vec); | |
2720 | return 1; | |
2721 | case BP_VECTOR: | |
2722 | if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) | |
2723 | return 0; | |
2724 | /* fall through */ | |
2725 | case DE_VECTOR: | |
2726 | case OF_VECTOR: | |
2727 | case BR_VECTOR: | |
2728 | case UD_VECTOR: | |
2729 | case DF_VECTOR: | |
2730 | case SS_VECTOR: | |
2731 | case GP_VECTOR: | |
2732 | case MF_VECTOR: | |
2733 | kvm_queue_exception(vcpu, vec); | |
2734 | return 1; | |
2735 | } | |
2736 | return 0; | |
2737 | } | |
2738 | ||
2739 | /* | |
2740 | * Trigger machine check on the host. We assume all the MSRs are already set up | |
2741 | * by the CPU and that we still run on the same CPU as the MCE occurred on. | |
2742 | * We pass a fake environment to the machine check handler because we want | |
2743 | * the guest to be always treated like user space, no matter what context | |
2744 | * it used internally. | |
2745 | */ | |
2746 | static void kvm_machine_check(void) | |
2747 | { | |
2748 | #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64) | |
2749 | struct pt_regs regs = { | |
2750 | .cs = 3, /* Fake ring 3 no matter what the guest ran on */ | |
2751 | .flags = X86_EFLAGS_IF, | |
2752 | }; | |
2753 | ||
2754 | do_machine_check(®s, 0); | |
2755 | #endif | |
2756 | } | |
2757 | ||
2758 | static int handle_machine_check(struct kvm_vcpu *vcpu) | |
2759 | { | |
2760 | /* already handled by vcpu_run */ | |
2761 | return 1; | |
2762 | } | |
2763 | ||
2764 | static int handle_exception(struct kvm_vcpu *vcpu) | |
2765 | { | |
2766 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
2767 | struct kvm_run *kvm_run = vcpu->run; | |
2768 | u32 intr_info, ex_no, error_code; | |
2769 | unsigned long cr2, rip, dr6; | |
2770 | u32 vect_info; | |
2771 | enum emulation_result er; | |
2772 | ||
2773 | vect_info = vmx->idt_vectoring_info; | |
2774 | intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
2775 | ||
2776 | if (is_machine_check(intr_info)) | |
2777 | return handle_machine_check(vcpu); | |
2778 | ||
2779 | if ((vect_info & VECTORING_INFO_VALID_MASK) && | |
2780 | !is_page_fault(intr_info)) { | |
2781 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
2782 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX; | |
2783 | vcpu->run->internal.ndata = 2; | |
2784 | vcpu->run->internal.data[0] = vect_info; | |
2785 | vcpu->run->internal.data[1] = intr_info; | |
2786 | return 0; | |
2787 | } | |
2788 | ||
2789 | if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR) | |
2790 | return 1; /* already handled by vmx_vcpu_run() */ | |
2791 | ||
2792 | if (is_no_device(intr_info)) { | |
2793 | vmx_fpu_activate(vcpu); | |
2794 | return 1; | |
2795 | } | |
2796 | ||
2797 | if (is_invalid_opcode(intr_info)) { | |
2798 | er = emulate_instruction(vcpu, 0, 0, EMULTYPE_TRAP_UD); | |
2799 | if (er != EMULATE_DONE) | |
2800 | kvm_queue_exception(vcpu, UD_VECTOR); | |
2801 | return 1; | |
2802 | } | |
2803 | ||
2804 | error_code = 0; | |
2805 | rip = kvm_rip_read(vcpu); | |
2806 | if (intr_info & INTR_INFO_DELIVER_CODE_MASK) | |
2807 | error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE); | |
2808 | if (is_page_fault(intr_info)) { | |
2809 | /* EPT won't cause page fault directly */ | |
2810 | if (enable_ept) | |
2811 | BUG(); | |
2812 | cr2 = vmcs_readl(EXIT_QUALIFICATION); | |
2813 | trace_kvm_page_fault(cr2, error_code); | |
2814 | ||
2815 | if (kvm_event_needs_reinjection(vcpu)) | |
2816 | kvm_mmu_unprotect_page_virt(vcpu, cr2); | |
2817 | return kvm_mmu_page_fault(vcpu, cr2, error_code); | |
2818 | } | |
2819 | ||
2820 | if (vmx->rmode.vm86_active && | |
2821 | handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK, | |
2822 | error_code)) { | |
2823 | if (vcpu->arch.halt_request) { | |
2824 | vcpu->arch.halt_request = 0; | |
2825 | return kvm_emulate_halt(vcpu); | |
2826 | } | |
2827 | return 1; | |
2828 | } | |
2829 | ||
2830 | ex_no = intr_info & INTR_INFO_VECTOR_MASK; | |
2831 | switch (ex_no) { | |
2832 | case DB_VECTOR: | |
2833 | dr6 = vmcs_readl(EXIT_QUALIFICATION); | |
2834 | if (!(vcpu->guest_debug & | |
2835 | (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { | |
2836 | vcpu->arch.dr6 = dr6 | DR6_FIXED_1; | |
2837 | kvm_queue_exception(vcpu, DB_VECTOR); | |
2838 | return 1; | |
2839 | } | |
2840 | kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1; | |
2841 | kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7); | |
2842 | /* fall through */ | |
2843 | case BP_VECTOR: | |
2844 | kvm_run->exit_reason = KVM_EXIT_DEBUG; | |
2845 | kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip; | |
2846 | kvm_run->debug.arch.exception = ex_no; | |
2847 | break; | |
2848 | default: | |
2849 | kvm_run->exit_reason = KVM_EXIT_EXCEPTION; | |
2850 | kvm_run->ex.exception = ex_no; | |
2851 | kvm_run->ex.error_code = error_code; | |
2852 | break; | |
2853 | } | |
2854 | return 0; | |
2855 | } | |
2856 | ||
2857 | static int handle_external_interrupt(struct kvm_vcpu *vcpu) | |
2858 | { | |
2859 | ++vcpu->stat.irq_exits; | |
2860 | return 1; | |
2861 | } | |
2862 | ||
2863 | static int handle_triple_fault(struct kvm_vcpu *vcpu) | |
2864 | { | |
2865 | vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; | |
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | static int handle_io(struct kvm_vcpu *vcpu) | |
2870 | { | |
2871 | unsigned long exit_qualification; | |
2872 | int size, in, string; | |
2873 | unsigned port; | |
2874 | ||
2875 | ++vcpu->stat.io_exits; | |
2876 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
2877 | string = (exit_qualification & 16) != 0; | |
2878 | ||
2879 | if (string) { | |
2880 | if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DO_MMIO) | |
2881 | return 0; | |
2882 | return 1; | |
2883 | } | |
2884 | ||
2885 | size = (exit_qualification & 7) + 1; | |
2886 | in = (exit_qualification & 8) != 0; | |
2887 | port = exit_qualification >> 16; | |
2888 | ||
2889 | skip_emulated_instruction(vcpu); | |
2890 | return kvm_emulate_pio(vcpu, in, size, port); | |
2891 | } | |
2892 | ||
2893 | static void | |
2894 | vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) | |
2895 | { | |
2896 | /* | |
2897 | * Patch in the VMCALL instruction: | |
2898 | */ | |
2899 | hypercall[0] = 0x0f; | |
2900 | hypercall[1] = 0x01; | |
2901 | hypercall[2] = 0xc1; | |
2902 | } | |
2903 | ||
2904 | static int handle_cr(struct kvm_vcpu *vcpu) | |
2905 | { | |
2906 | unsigned long exit_qualification, val; | |
2907 | int cr; | |
2908 | int reg; | |
2909 | ||
2910 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
2911 | cr = exit_qualification & 15; | |
2912 | reg = (exit_qualification >> 8) & 15; | |
2913 | switch ((exit_qualification >> 4) & 3) { | |
2914 | case 0: /* mov to cr */ | |
2915 | val = kvm_register_read(vcpu, reg); | |
2916 | trace_kvm_cr_write(cr, val); | |
2917 | switch (cr) { | |
2918 | case 0: | |
2919 | kvm_set_cr0(vcpu, val); | |
2920 | skip_emulated_instruction(vcpu); | |
2921 | return 1; | |
2922 | case 3: | |
2923 | kvm_set_cr3(vcpu, val); | |
2924 | skip_emulated_instruction(vcpu); | |
2925 | return 1; | |
2926 | case 4: | |
2927 | kvm_set_cr4(vcpu, val); | |
2928 | skip_emulated_instruction(vcpu); | |
2929 | return 1; | |
2930 | case 8: { | |
2931 | u8 cr8_prev = kvm_get_cr8(vcpu); | |
2932 | u8 cr8 = kvm_register_read(vcpu, reg); | |
2933 | kvm_set_cr8(vcpu, cr8); | |
2934 | skip_emulated_instruction(vcpu); | |
2935 | if (irqchip_in_kernel(vcpu->kvm)) | |
2936 | return 1; | |
2937 | if (cr8_prev <= cr8) | |
2938 | return 1; | |
2939 | vcpu->run->exit_reason = KVM_EXIT_SET_TPR; | |
2940 | return 0; | |
2941 | } | |
2942 | }; | |
2943 | break; | |
2944 | case 2: /* clts */ | |
2945 | vmx_fpu_deactivate(vcpu); | |
2946 | vcpu->arch.cr0 &= ~X86_CR0_TS; | |
2947 | vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0); | |
2948 | vmx_fpu_activate(vcpu); | |
2949 | skip_emulated_instruction(vcpu); | |
2950 | return 1; | |
2951 | case 1: /*mov from cr*/ | |
2952 | switch (cr) { | |
2953 | case 3: | |
2954 | kvm_register_write(vcpu, reg, vcpu->arch.cr3); | |
2955 | trace_kvm_cr_read(cr, vcpu->arch.cr3); | |
2956 | skip_emulated_instruction(vcpu); | |
2957 | return 1; | |
2958 | case 8: | |
2959 | val = kvm_get_cr8(vcpu); | |
2960 | kvm_register_write(vcpu, reg, val); | |
2961 | trace_kvm_cr_read(cr, val); | |
2962 | skip_emulated_instruction(vcpu); | |
2963 | return 1; | |
2964 | } | |
2965 | break; | |
2966 | case 3: /* lmsw */ | |
2967 | kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f); | |
2968 | ||
2969 | skip_emulated_instruction(vcpu); | |
2970 | return 1; | |
2971 | default: | |
2972 | break; | |
2973 | } | |
2974 | vcpu->run->exit_reason = 0; | |
2975 | pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n", | |
2976 | (int)(exit_qualification >> 4) & 3, cr); | |
2977 | return 0; | |
2978 | } | |
2979 | ||
2980 | static int handle_dr(struct kvm_vcpu *vcpu) | |
2981 | { | |
2982 | unsigned long exit_qualification; | |
2983 | unsigned long val; | |
2984 | int dr, reg; | |
2985 | ||
2986 | if (!kvm_require_cpl(vcpu, 0)) | |
2987 | return 1; | |
2988 | dr = vmcs_readl(GUEST_DR7); | |
2989 | if (dr & DR7_GD) { | |
2990 | /* | |
2991 | * As the vm-exit takes precedence over the debug trap, we | |
2992 | * need to emulate the latter, either for the host or the | |
2993 | * guest debugging itself. | |
2994 | */ | |
2995 | if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { | |
2996 | vcpu->run->debug.arch.dr6 = vcpu->arch.dr6; | |
2997 | vcpu->run->debug.arch.dr7 = dr; | |
2998 | vcpu->run->debug.arch.pc = | |
2999 | vmcs_readl(GUEST_CS_BASE) + | |
3000 | vmcs_readl(GUEST_RIP); | |
3001 | vcpu->run->debug.arch.exception = DB_VECTOR; | |
3002 | vcpu->run->exit_reason = KVM_EXIT_DEBUG; | |
3003 | return 0; | |
3004 | } else { | |
3005 | vcpu->arch.dr7 &= ~DR7_GD; | |
3006 | vcpu->arch.dr6 |= DR6_BD; | |
3007 | vmcs_writel(GUEST_DR7, vcpu->arch.dr7); | |
3008 | kvm_queue_exception(vcpu, DB_VECTOR); | |
3009 | return 1; | |
3010 | } | |
3011 | } | |
3012 | ||
3013 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
3014 | dr = exit_qualification & DEBUG_REG_ACCESS_NUM; | |
3015 | reg = DEBUG_REG_ACCESS_REG(exit_qualification); | |
3016 | if (exit_qualification & TYPE_MOV_FROM_DR) { | |
3017 | switch (dr) { | |
3018 | case 0 ... 3: | |
3019 | val = vcpu->arch.db[dr]; | |
3020 | break; | |
3021 | case 6: | |
3022 | val = vcpu->arch.dr6; | |
3023 | break; | |
3024 | case 7: | |
3025 | val = vcpu->arch.dr7; | |
3026 | break; | |
3027 | default: | |
3028 | val = 0; | |
3029 | } | |
3030 | kvm_register_write(vcpu, reg, val); | |
3031 | } else { | |
3032 | val = vcpu->arch.regs[reg]; | |
3033 | switch (dr) { | |
3034 | case 0 ... 3: | |
3035 | vcpu->arch.db[dr] = val; | |
3036 | if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) | |
3037 | vcpu->arch.eff_db[dr] = val; | |
3038 | break; | |
3039 | case 4 ... 5: | |
3040 | if (vcpu->arch.cr4 & X86_CR4_DE) | |
3041 | kvm_queue_exception(vcpu, UD_VECTOR); | |
3042 | break; | |
3043 | case 6: | |
3044 | if (val & 0xffffffff00000000ULL) { | |
3045 | kvm_queue_exception(vcpu, GP_VECTOR); | |
3046 | break; | |
3047 | } | |
3048 | vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1; | |
3049 | break; | |
3050 | case 7: | |
3051 | if (val & 0xffffffff00000000ULL) { | |
3052 | kvm_queue_exception(vcpu, GP_VECTOR); | |
3053 | break; | |
3054 | } | |
3055 | vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; | |
3056 | if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { | |
3057 | vmcs_writel(GUEST_DR7, vcpu->arch.dr7); | |
3058 | vcpu->arch.switch_db_regs = | |
3059 | (val & DR7_BP_EN_MASK); | |
3060 | } | |
3061 | break; | |
3062 | } | |
3063 | } | |
3064 | skip_emulated_instruction(vcpu); | |
3065 | return 1; | |
3066 | } | |
3067 | ||
3068 | static int handle_cpuid(struct kvm_vcpu *vcpu) | |
3069 | { | |
3070 | kvm_emulate_cpuid(vcpu); | |
3071 | return 1; | |
3072 | } | |
3073 | ||
3074 | static int handle_rdmsr(struct kvm_vcpu *vcpu) | |
3075 | { | |
3076 | u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; | |
3077 | u64 data; | |
3078 | ||
3079 | if (vmx_get_msr(vcpu, ecx, &data)) { | |
3080 | kvm_inject_gp(vcpu, 0); | |
3081 | return 1; | |
3082 | } | |
3083 | ||
3084 | trace_kvm_msr_read(ecx, data); | |
3085 | ||
3086 | /* FIXME: handling of bits 32:63 of rax, rdx */ | |
3087 | vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u; | |
3088 | vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u; | |
3089 | skip_emulated_instruction(vcpu); | |
3090 | return 1; | |
3091 | } | |
3092 | ||
3093 | static int handle_wrmsr(struct kvm_vcpu *vcpu) | |
3094 | { | |
3095 | u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; | |
3096 | u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) | |
3097 | | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); | |
3098 | ||
3099 | trace_kvm_msr_write(ecx, data); | |
3100 | ||
3101 | if (vmx_set_msr(vcpu, ecx, data) != 0) { | |
3102 | kvm_inject_gp(vcpu, 0); | |
3103 | return 1; | |
3104 | } | |
3105 | ||
3106 | skip_emulated_instruction(vcpu); | |
3107 | return 1; | |
3108 | } | |
3109 | ||
3110 | static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu) | |
3111 | { | |
3112 | return 1; | |
3113 | } | |
3114 | ||
3115 | static int handle_interrupt_window(struct kvm_vcpu *vcpu) | |
3116 | { | |
3117 | u32 cpu_based_vm_exec_control; | |
3118 | ||
3119 | /* clear pending irq */ | |
3120 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
3121 | cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING; | |
3122 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
3123 | ||
3124 | ++vcpu->stat.irq_window_exits; | |
3125 | ||
3126 | /* | |
3127 | * If the user space waits to inject interrupts, exit as soon as | |
3128 | * possible | |
3129 | */ | |
3130 | if (!irqchip_in_kernel(vcpu->kvm) && | |
3131 | vcpu->run->request_interrupt_window && | |
3132 | !kvm_cpu_has_interrupt(vcpu)) { | |
3133 | vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN; | |
3134 | return 0; | |
3135 | } | |
3136 | return 1; | |
3137 | } | |
3138 | ||
3139 | static int handle_halt(struct kvm_vcpu *vcpu) | |
3140 | { | |
3141 | skip_emulated_instruction(vcpu); | |
3142 | return kvm_emulate_halt(vcpu); | |
3143 | } | |
3144 | ||
3145 | static int handle_vmcall(struct kvm_vcpu *vcpu) | |
3146 | { | |
3147 | skip_emulated_instruction(vcpu); | |
3148 | kvm_emulate_hypercall(vcpu); | |
3149 | return 1; | |
3150 | } | |
3151 | ||
3152 | static int handle_vmx_insn(struct kvm_vcpu *vcpu) | |
3153 | { | |
3154 | kvm_queue_exception(vcpu, UD_VECTOR); | |
3155 | return 1; | |
3156 | } | |
3157 | ||
3158 | static int handle_invlpg(struct kvm_vcpu *vcpu) | |
3159 | { | |
3160 | unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
3161 | ||
3162 | kvm_mmu_invlpg(vcpu, exit_qualification); | |
3163 | skip_emulated_instruction(vcpu); | |
3164 | return 1; | |
3165 | } | |
3166 | ||
3167 | static int handle_wbinvd(struct kvm_vcpu *vcpu) | |
3168 | { | |
3169 | skip_emulated_instruction(vcpu); | |
3170 | /* TODO: Add support for VT-d/pass-through device */ | |
3171 | return 1; | |
3172 | } | |
3173 | ||
3174 | static int handle_apic_access(struct kvm_vcpu *vcpu) | |
3175 | { | |
3176 | unsigned long exit_qualification; | |
3177 | enum emulation_result er; | |
3178 | unsigned long offset; | |
3179 | ||
3180 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
3181 | offset = exit_qualification & 0xffful; | |
3182 | ||
3183 | er = emulate_instruction(vcpu, 0, 0, 0); | |
3184 | ||
3185 | if (er != EMULATE_DONE) { | |
3186 | printk(KERN_ERR | |
3187 | "Fail to handle apic access vmexit! Offset is 0x%lx\n", | |
3188 | offset); | |
3189 | return -ENOEXEC; | |
3190 | } | |
3191 | return 1; | |
3192 | } | |
3193 | ||
3194 | static int handle_task_switch(struct kvm_vcpu *vcpu) | |
3195 | { | |
3196 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3197 | unsigned long exit_qualification; | |
3198 | u16 tss_selector; | |
3199 | int reason, type, idt_v; | |
3200 | ||
3201 | idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK); | |
3202 | type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK); | |
3203 | ||
3204 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
3205 | ||
3206 | reason = (u32)exit_qualification >> 30; | |
3207 | if (reason == TASK_SWITCH_GATE && idt_v) { | |
3208 | switch (type) { | |
3209 | case INTR_TYPE_NMI_INTR: | |
3210 | vcpu->arch.nmi_injected = false; | |
3211 | if (cpu_has_virtual_nmis()) | |
3212 | vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, | |
3213 | GUEST_INTR_STATE_NMI); | |
3214 | break; | |
3215 | case INTR_TYPE_EXT_INTR: | |
3216 | case INTR_TYPE_SOFT_INTR: | |
3217 | kvm_clear_interrupt_queue(vcpu); | |
3218 | break; | |
3219 | case INTR_TYPE_HARD_EXCEPTION: | |
3220 | case INTR_TYPE_SOFT_EXCEPTION: | |
3221 | kvm_clear_exception_queue(vcpu); | |
3222 | break; | |
3223 | default: | |
3224 | break; | |
3225 | } | |
3226 | } | |
3227 | tss_selector = exit_qualification; | |
3228 | ||
3229 | if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION && | |
3230 | type != INTR_TYPE_EXT_INTR && | |
3231 | type != INTR_TYPE_NMI_INTR)) | |
3232 | skip_emulated_instruction(vcpu); | |
3233 | ||
3234 | if (!kvm_task_switch(vcpu, tss_selector, reason)) | |
3235 | return 0; | |
3236 | ||
3237 | /* clear all local breakpoint enable flags */ | |
3238 | vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55); | |
3239 | ||
3240 | /* | |
3241 | * TODO: What about debug traps on tss switch? | |
3242 | * Are we supposed to inject them and update dr6? | |
3243 | */ | |
3244 | ||
3245 | return 1; | |
3246 | } | |
3247 | ||
3248 | static int handle_ept_violation(struct kvm_vcpu *vcpu) | |
3249 | { | |
3250 | unsigned long exit_qualification; | |
3251 | gpa_t gpa; | |
3252 | int gla_validity; | |
3253 | ||
3254 | exit_qualification = vmcs_readl(EXIT_QUALIFICATION); | |
3255 | ||
3256 | if (exit_qualification & (1 << 6)) { | |
3257 | printk(KERN_ERR "EPT: GPA exceeds GAW!\n"); | |
3258 | return -EINVAL; | |
3259 | } | |
3260 | ||
3261 | gla_validity = (exit_qualification >> 7) & 0x3; | |
3262 | if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) { | |
3263 | printk(KERN_ERR "EPT: Handling EPT violation failed!\n"); | |
3264 | printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n", | |
3265 | (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS), | |
3266 | vmcs_readl(GUEST_LINEAR_ADDRESS)); | |
3267 | printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n", | |
3268 | (long unsigned int)exit_qualification); | |
3269 | vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; | |
3270 | vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION; | |
3271 | return 0; | |
3272 | } | |
3273 | ||
3274 | gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); | |
3275 | trace_kvm_page_fault(gpa, exit_qualification); | |
3276 | return kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0); | |
3277 | } | |
3278 | ||
3279 | static u64 ept_rsvd_mask(u64 spte, int level) | |
3280 | { | |
3281 | int i; | |
3282 | u64 mask = 0; | |
3283 | ||
3284 | for (i = 51; i > boot_cpu_data.x86_phys_bits; i--) | |
3285 | mask |= (1ULL << i); | |
3286 | ||
3287 | if (level > 2) | |
3288 | /* bits 7:3 reserved */ | |
3289 | mask |= 0xf8; | |
3290 | else if (level == 2) { | |
3291 | if (spte & (1ULL << 7)) | |
3292 | /* 2MB ref, bits 20:12 reserved */ | |
3293 | mask |= 0x1ff000; | |
3294 | else | |
3295 | /* bits 6:3 reserved */ | |
3296 | mask |= 0x78; | |
3297 | } | |
3298 | ||
3299 | return mask; | |
3300 | } | |
3301 | ||
3302 | static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte, | |
3303 | int level) | |
3304 | { | |
3305 | printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level); | |
3306 | ||
3307 | /* 010b (write-only) */ | |
3308 | WARN_ON((spte & 0x7) == 0x2); | |
3309 | ||
3310 | /* 110b (write/execute) */ | |
3311 | WARN_ON((spte & 0x7) == 0x6); | |
3312 | ||
3313 | /* 100b (execute-only) and value not supported by logical processor */ | |
3314 | if (!cpu_has_vmx_ept_execute_only()) | |
3315 | WARN_ON((spte & 0x7) == 0x4); | |
3316 | ||
3317 | /* not 000b */ | |
3318 | if ((spte & 0x7)) { | |
3319 | u64 rsvd_bits = spte & ept_rsvd_mask(spte, level); | |
3320 | ||
3321 | if (rsvd_bits != 0) { | |
3322 | printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n", | |
3323 | __func__, rsvd_bits); | |
3324 | WARN_ON(1); | |
3325 | } | |
3326 | ||
3327 | if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) { | |
3328 | u64 ept_mem_type = (spte & 0x38) >> 3; | |
3329 | ||
3330 | if (ept_mem_type == 2 || ept_mem_type == 3 || | |
3331 | ept_mem_type == 7) { | |
3332 | printk(KERN_ERR "%s: ept_mem_type=0x%llx\n", | |
3333 | __func__, ept_mem_type); | |
3334 | WARN_ON(1); | |
3335 | } | |
3336 | } | |
3337 | } | |
3338 | } | |
3339 | ||
3340 | static int handle_ept_misconfig(struct kvm_vcpu *vcpu) | |
3341 | { | |
3342 | u64 sptes[4]; | |
3343 | int nr_sptes, i; | |
3344 | gpa_t gpa; | |
3345 | ||
3346 | gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS); | |
3347 | ||
3348 | printk(KERN_ERR "EPT: Misconfiguration.\n"); | |
3349 | printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa); | |
3350 | ||
3351 | nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes); | |
3352 | ||
3353 | for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i) | |
3354 | ept_misconfig_inspect_spte(vcpu, sptes[i-1], i); | |
3355 | ||
3356 | vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; | |
3357 | vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG; | |
3358 | ||
3359 | return 0; | |
3360 | } | |
3361 | ||
3362 | static int handle_nmi_window(struct kvm_vcpu *vcpu) | |
3363 | { | |
3364 | u32 cpu_based_vm_exec_control; | |
3365 | ||
3366 | /* clear pending NMI */ | |
3367 | cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); | |
3368 | cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING; | |
3369 | vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); | |
3370 | ++vcpu->stat.nmi_window_exits; | |
3371 | ||
3372 | return 1; | |
3373 | } | |
3374 | ||
3375 | static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) | |
3376 | { | |
3377 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3378 | enum emulation_result err = EMULATE_DONE; | |
3379 | int ret = 1; | |
3380 | ||
3381 | while (!guest_state_valid(vcpu)) { | |
3382 | err = emulate_instruction(vcpu, 0, 0, 0); | |
3383 | ||
3384 | if (err == EMULATE_DO_MMIO) { | |
3385 | ret = 0; | |
3386 | goto out; | |
3387 | } | |
3388 | ||
3389 | if (err != EMULATE_DONE) { | |
3390 | kvm_report_emulation_failure(vcpu, "emulation failure"); | |
3391 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; | |
3392 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; | |
3393 | vcpu->run->internal.ndata = 0; | |
3394 | ret = 0; | |
3395 | goto out; | |
3396 | } | |
3397 | ||
3398 | if (signal_pending(current)) | |
3399 | goto out; | |
3400 | if (need_resched()) | |
3401 | schedule(); | |
3402 | } | |
3403 | ||
3404 | vmx->emulation_required = 0; | |
3405 | out: | |
3406 | return ret; | |
3407 | } | |
3408 | ||
3409 | /* | |
3410 | * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE | |
3411 | * exiting, so only get here on cpu with PAUSE-Loop-Exiting. | |
3412 | */ | |
3413 | static int handle_pause(struct kvm_vcpu *vcpu) | |
3414 | { | |
3415 | skip_emulated_instruction(vcpu); | |
3416 | kvm_vcpu_on_spin(vcpu); | |
3417 | ||
3418 | return 1; | |
3419 | } | |
3420 | ||
3421 | static int handle_invalid_op(struct kvm_vcpu *vcpu) | |
3422 | { | |
3423 | kvm_queue_exception(vcpu, UD_VECTOR); | |
3424 | return 1; | |
3425 | } | |
3426 | ||
3427 | /* | |
3428 | * The exit handlers return 1 if the exit was handled fully and guest execution | |
3429 | * may resume. Otherwise they set the kvm_run parameter to indicate what needs | |
3430 | * to be done to userspace and return 0. | |
3431 | */ | |
3432 | static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = { | |
3433 | [EXIT_REASON_EXCEPTION_NMI] = handle_exception, | |
3434 | [EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt, | |
3435 | [EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault, | |
3436 | [EXIT_REASON_NMI_WINDOW] = handle_nmi_window, | |
3437 | [EXIT_REASON_IO_INSTRUCTION] = handle_io, | |
3438 | [EXIT_REASON_CR_ACCESS] = handle_cr, | |
3439 | [EXIT_REASON_DR_ACCESS] = handle_dr, | |
3440 | [EXIT_REASON_CPUID] = handle_cpuid, | |
3441 | [EXIT_REASON_MSR_READ] = handle_rdmsr, | |
3442 | [EXIT_REASON_MSR_WRITE] = handle_wrmsr, | |
3443 | [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window, | |
3444 | [EXIT_REASON_HLT] = handle_halt, | |
3445 | [EXIT_REASON_INVLPG] = handle_invlpg, | |
3446 | [EXIT_REASON_VMCALL] = handle_vmcall, | |
3447 | [EXIT_REASON_VMCLEAR] = handle_vmx_insn, | |
3448 | [EXIT_REASON_VMLAUNCH] = handle_vmx_insn, | |
3449 | [EXIT_REASON_VMPTRLD] = handle_vmx_insn, | |
3450 | [EXIT_REASON_VMPTRST] = handle_vmx_insn, | |
3451 | [EXIT_REASON_VMREAD] = handle_vmx_insn, | |
3452 | [EXIT_REASON_VMRESUME] = handle_vmx_insn, | |
3453 | [EXIT_REASON_VMWRITE] = handle_vmx_insn, | |
3454 | [EXIT_REASON_VMOFF] = handle_vmx_insn, | |
3455 | [EXIT_REASON_VMON] = handle_vmx_insn, | |
3456 | [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold, | |
3457 | [EXIT_REASON_APIC_ACCESS] = handle_apic_access, | |
3458 | [EXIT_REASON_WBINVD] = handle_wbinvd, | |
3459 | [EXIT_REASON_TASK_SWITCH] = handle_task_switch, | |
3460 | [EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check, | |
3461 | [EXIT_REASON_EPT_VIOLATION] = handle_ept_violation, | |
3462 | [EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig, | |
3463 | [EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause, | |
3464 | [EXIT_REASON_MWAIT_INSTRUCTION] = handle_invalid_op, | |
3465 | [EXIT_REASON_MONITOR_INSTRUCTION] = handle_invalid_op, | |
3466 | }; | |
3467 | ||
3468 | static const int kvm_vmx_max_exit_handlers = | |
3469 | ARRAY_SIZE(kvm_vmx_exit_handlers); | |
3470 | ||
3471 | /* | |
3472 | * The guest has exited. See if we can fix it or if we need userspace | |
3473 | * assistance. | |
3474 | */ | |
3475 | static int vmx_handle_exit(struct kvm_vcpu *vcpu) | |
3476 | { | |
3477 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3478 | u32 exit_reason = vmx->exit_reason; | |
3479 | u32 vectoring_info = vmx->idt_vectoring_info; | |
3480 | ||
3481 | trace_kvm_exit(exit_reason, kvm_rip_read(vcpu)); | |
3482 | ||
3483 | /* If guest state is invalid, start emulating */ | |
3484 | if (vmx->emulation_required && emulate_invalid_guest_state) | |
3485 | return handle_invalid_guest_state(vcpu); | |
3486 | ||
3487 | /* Access CR3 don't cause VMExit in paging mode, so we need | |
3488 | * to sync with guest real CR3. */ | |
3489 | if (enable_ept && is_paging(vcpu)) | |
3490 | vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); | |
3491 | ||
3492 | if (unlikely(vmx->fail)) { | |
3493 | vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY; | |
3494 | vcpu->run->fail_entry.hardware_entry_failure_reason | |
3495 | = vmcs_read32(VM_INSTRUCTION_ERROR); | |
3496 | return 0; | |
3497 | } | |
3498 | ||
3499 | if ((vectoring_info & VECTORING_INFO_VALID_MASK) && | |
3500 | (exit_reason != EXIT_REASON_EXCEPTION_NMI && | |
3501 | exit_reason != EXIT_REASON_EPT_VIOLATION && | |
3502 | exit_reason != EXIT_REASON_TASK_SWITCH)) | |
3503 | printk(KERN_WARNING "%s: unexpected, valid vectoring info " | |
3504 | "(0x%x) and exit reason is 0x%x\n", | |
3505 | __func__, vectoring_info, exit_reason); | |
3506 | ||
3507 | if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) { | |
3508 | if (vmx_interrupt_allowed(vcpu)) { | |
3509 | vmx->soft_vnmi_blocked = 0; | |
3510 | } else if (vmx->vnmi_blocked_time > 1000000000LL && | |
3511 | vcpu->arch.nmi_pending) { | |
3512 | /* | |
3513 | * This CPU don't support us in finding the end of an | |
3514 | * NMI-blocked window if the guest runs with IRQs | |
3515 | * disabled. So we pull the trigger after 1 s of | |
3516 | * futile waiting, but inform the user about this. | |
3517 | */ | |
3518 | printk(KERN_WARNING "%s: Breaking out of NMI-blocked " | |
3519 | "state on VCPU %d after 1 s timeout\n", | |
3520 | __func__, vcpu->vcpu_id); | |
3521 | vmx->soft_vnmi_blocked = 0; | |
3522 | } | |
3523 | } | |
3524 | ||
3525 | if (exit_reason < kvm_vmx_max_exit_handlers | |
3526 | && kvm_vmx_exit_handlers[exit_reason]) | |
3527 | return kvm_vmx_exit_handlers[exit_reason](vcpu); | |
3528 | else { | |
3529 | vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; | |
3530 | vcpu->run->hw.hardware_exit_reason = exit_reason; | |
3531 | } | |
3532 | return 0; | |
3533 | } | |
3534 | ||
3535 | static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr) | |
3536 | { | |
3537 | if (irr == -1 || tpr < irr) { | |
3538 | vmcs_write32(TPR_THRESHOLD, 0); | |
3539 | return; | |
3540 | } | |
3541 | ||
3542 | vmcs_write32(TPR_THRESHOLD, irr); | |
3543 | } | |
3544 | ||
3545 | static void vmx_complete_interrupts(struct vcpu_vmx *vmx) | |
3546 | { | |
3547 | u32 exit_intr_info; | |
3548 | u32 idt_vectoring_info = vmx->idt_vectoring_info; | |
3549 | bool unblock_nmi; | |
3550 | u8 vector; | |
3551 | int type; | |
3552 | bool idtv_info_valid; | |
3553 | ||
3554 | exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO); | |
3555 | ||
3556 | vmx->exit_reason = vmcs_read32(VM_EXIT_REASON); | |
3557 | ||
3558 | /* Handle machine checks before interrupts are enabled */ | |
3559 | if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY) | |
3560 | || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI | |
3561 | && is_machine_check(exit_intr_info))) | |
3562 | kvm_machine_check(); | |
3563 | ||
3564 | /* We need to handle NMIs before interrupts are enabled */ | |
3565 | if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR && | |
3566 | (exit_intr_info & INTR_INFO_VALID_MASK)) | |
3567 | asm("int $2"); | |
3568 | ||
3569 | idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK; | |
3570 | ||
3571 | if (cpu_has_virtual_nmis()) { | |
3572 | unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0; | |
3573 | vector = exit_intr_info & INTR_INFO_VECTOR_MASK; | |
3574 | /* | |
3575 | * SDM 3: 27.7.1.2 (September 2008) | |
3576 | * Re-set bit "block by NMI" before VM entry if vmexit caused by | |
3577 | * a guest IRET fault. | |
3578 | * SDM 3: 23.2.2 (September 2008) | |
3579 | * Bit 12 is undefined in any of the following cases: | |
3580 | * If the VM exit sets the valid bit in the IDT-vectoring | |
3581 | * information field. | |
3582 | * If the VM exit is due to a double fault. | |
3583 | */ | |
3584 | if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi && | |
3585 | vector != DF_VECTOR && !idtv_info_valid) | |
3586 | vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, | |
3587 | GUEST_INTR_STATE_NMI); | |
3588 | } else if (unlikely(vmx->soft_vnmi_blocked)) | |
3589 | vmx->vnmi_blocked_time += | |
3590 | ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time)); | |
3591 | ||
3592 | vmx->vcpu.arch.nmi_injected = false; | |
3593 | kvm_clear_exception_queue(&vmx->vcpu); | |
3594 | kvm_clear_interrupt_queue(&vmx->vcpu); | |
3595 | ||
3596 | if (!idtv_info_valid) | |
3597 | return; | |
3598 | ||
3599 | vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK; | |
3600 | type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK; | |
3601 | ||
3602 | switch (type) { | |
3603 | case INTR_TYPE_NMI_INTR: | |
3604 | vmx->vcpu.arch.nmi_injected = true; | |
3605 | /* | |
3606 | * SDM 3: 27.7.1.2 (September 2008) | |
3607 | * Clear bit "block by NMI" before VM entry if a NMI | |
3608 | * delivery faulted. | |
3609 | */ | |
3610 | vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO, | |
3611 | GUEST_INTR_STATE_NMI); | |
3612 | break; | |
3613 | case INTR_TYPE_SOFT_EXCEPTION: | |
3614 | vmx->vcpu.arch.event_exit_inst_len = | |
3615 | vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
3616 | /* fall through */ | |
3617 | case INTR_TYPE_HARD_EXCEPTION: | |
3618 | if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) { | |
3619 | u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE); | |
3620 | kvm_queue_exception_e(&vmx->vcpu, vector, err); | |
3621 | } else | |
3622 | kvm_queue_exception(&vmx->vcpu, vector); | |
3623 | break; | |
3624 | case INTR_TYPE_SOFT_INTR: | |
3625 | vmx->vcpu.arch.event_exit_inst_len = | |
3626 | vmcs_read32(VM_EXIT_INSTRUCTION_LEN); | |
3627 | /* fall through */ | |
3628 | case INTR_TYPE_EXT_INTR: | |
3629 | kvm_queue_interrupt(&vmx->vcpu, vector, | |
3630 | type == INTR_TYPE_SOFT_INTR); | |
3631 | break; | |
3632 | default: | |
3633 | break; | |
3634 | } | |
3635 | } | |
3636 | ||
3637 | /* | |
3638 | * Failure to inject an interrupt should give us the information | |
3639 | * in IDT_VECTORING_INFO_FIELD. However, if the failure occurs | |
3640 | * when fetching the interrupt redirection bitmap in the real-mode | |
3641 | * tss, this doesn't happen. So we do it ourselves. | |
3642 | */ | |
3643 | static void fixup_rmode_irq(struct vcpu_vmx *vmx) | |
3644 | { | |
3645 | vmx->rmode.irq.pending = 0; | |
3646 | if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip) | |
3647 | return; | |
3648 | kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip); | |
3649 | if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) { | |
3650 | vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK; | |
3651 | vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR; | |
3652 | return; | |
3653 | } | |
3654 | vmx->idt_vectoring_info = | |
3655 | VECTORING_INFO_VALID_MASK | |
3656 | | INTR_TYPE_EXT_INTR | |
3657 | | vmx->rmode.irq.vector; | |
3658 | } | |
3659 | ||
3660 | #ifdef CONFIG_X86_64 | |
3661 | #define R "r" | |
3662 | #define Q "q" | |
3663 | #else | |
3664 | #define R "e" | |
3665 | #define Q "l" | |
3666 | #endif | |
3667 | ||
3668 | static void vmx_vcpu_run(struct kvm_vcpu *vcpu) | |
3669 | { | |
3670 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3671 | ||
3672 | /* Record the guest's net vcpu time for enforced NMI injections. */ | |
3673 | if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) | |
3674 | vmx->entry_time = ktime_get(); | |
3675 | ||
3676 | /* Don't enter VMX if guest state is invalid, let the exit handler | |
3677 | start emulation until we arrive back to a valid state */ | |
3678 | if (vmx->emulation_required && emulate_invalid_guest_state) | |
3679 | return; | |
3680 | ||
3681 | if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty)) | |
3682 | vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]); | |
3683 | if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty)) | |
3684 | vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]); | |
3685 | ||
3686 | /* When single-stepping over STI and MOV SS, we must clear the | |
3687 | * corresponding interruptibility bits in the guest state. Otherwise | |
3688 | * vmentry fails as it then expects bit 14 (BS) in pending debug | |
3689 | * exceptions being set, but that's not correct for the guest debugging | |
3690 | * case. */ | |
3691 | if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) | |
3692 | vmx_set_interrupt_shadow(vcpu, 0); | |
3693 | ||
3694 | /* | |
3695 | * Loading guest fpu may have cleared host cr0.ts | |
3696 | */ | |
3697 | vmcs_writel(HOST_CR0, read_cr0()); | |
3698 | ||
3699 | if (vcpu->arch.switch_db_regs) | |
3700 | set_debugreg(vcpu->arch.dr6, 6); | |
3701 | ||
3702 | asm( | |
3703 | /* Store host registers */ | |
3704 | "push %%"R"dx; push %%"R"bp;" | |
3705 | "push %%"R"cx \n\t" | |
3706 | "cmp %%"R"sp, %c[host_rsp](%0) \n\t" | |
3707 | "je 1f \n\t" | |
3708 | "mov %%"R"sp, %c[host_rsp](%0) \n\t" | |
3709 | __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" | |
3710 | "1: \n\t" | |
3711 | /* Reload cr2 if changed */ | |
3712 | "mov %c[cr2](%0), %%"R"ax \n\t" | |
3713 | "mov %%cr2, %%"R"dx \n\t" | |
3714 | "cmp %%"R"ax, %%"R"dx \n\t" | |
3715 | "je 2f \n\t" | |
3716 | "mov %%"R"ax, %%cr2 \n\t" | |
3717 | "2: \n\t" | |
3718 | /* Check if vmlaunch of vmresume is needed */ | |
3719 | "cmpl $0, %c[launched](%0) \n\t" | |
3720 | /* Load guest registers. Don't clobber flags. */ | |
3721 | "mov %c[rax](%0), %%"R"ax \n\t" | |
3722 | "mov %c[rbx](%0), %%"R"bx \n\t" | |
3723 | "mov %c[rdx](%0), %%"R"dx \n\t" | |
3724 | "mov %c[rsi](%0), %%"R"si \n\t" | |
3725 | "mov %c[rdi](%0), %%"R"di \n\t" | |
3726 | "mov %c[rbp](%0), %%"R"bp \n\t" | |
3727 | #ifdef CONFIG_X86_64 | |
3728 | "mov %c[r8](%0), %%r8 \n\t" | |
3729 | "mov %c[r9](%0), %%r9 \n\t" | |
3730 | "mov %c[r10](%0), %%r10 \n\t" | |
3731 | "mov %c[r11](%0), %%r11 \n\t" | |
3732 | "mov %c[r12](%0), %%r12 \n\t" | |
3733 | "mov %c[r13](%0), %%r13 \n\t" | |
3734 | "mov %c[r14](%0), %%r14 \n\t" | |
3735 | "mov %c[r15](%0), %%r15 \n\t" | |
3736 | #endif | |
3737 | "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */ | |
3738 | ||
3739 | /* Enter guest mode */ | |
3740 | "jne .Llaunched \n\t" | |
3741 | __ex(ASM_VMX_VMLAUNCH) "\n\t" | |
3742 | "jmp .Lkvm_vmx_return \n\t" | |
3743 | ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t" | |
3744 | ".Lkvm_vmx_return: " | |
3745 | /* Save guest registers, load host registers, keep flags */ | |
3746 | "xchg %0, (%%"R"sp) \n\t" | |
3747 | "mov %%"R"ax, %c[rax](%0) \n\t" | |
3748 | "mov %%"R"bx, %c[rbx](%0) \n\t" | |
3749 | "push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t" | |
3750 | "mov %%"R"dx, %c[rdx](%0) \n\t" | |
3751 | "mov %%"R"si, %c[rsi](%0) \n\t" | |
3752 | "mov %%"R"di, %c[rdi](%0) \n\t" | |
3753 | "mov %%"R"bp, %c[rbp](%0) \n\t" | |
3754 | #ifdef CONFIG_X86_64 | |
3755 | "mov %%r8, %c[r8](%0) \n\t" | |
3756 | "mov %%r9, %c[r9](%0) \n\t" | |
3757 | "mov %%r10, %c[r10](%0) \n\t" | |
3758 | "mov %%r11, %c[r11](%0) \n\t" | |
3759 | "mov %%r12, %c[r12](%0) \n\t" | |
3760 | "mov %%r13, %c[r13](%0) \n\t" | |
3761 | "mov %%r14, %c[r14](%0) \n\t" | |
3762 | "mov %%r15, %c[r15](%0) \n\t" | |
3763 | #endif | |
3764 | "mov %%cr2, %%"R"ax \n\t" | |
3765 | "mov %%"R"ax, %c[cr2](%0) \n\t" | |
3766 | ||
3767 | "pop %%"R"bp; pop %%"R"bp; pop %%"R"dx \n\t" | |
3768 | "setbe %c[fail](%0) \n\t" | |
3769 | : : "c"(vmx), "d"((unsigned long)HOST_RSP), | |
3770 | [launched]"i"(offsetof(struct vcpu_vmx, launched)), | |
3771 | [fail]"i"(offsetof(struct vcpu_vmx, fail)), | |
3772 | [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)), | |
3773 | [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])), | |
3774 | [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])), | |
3775 | [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])), | |
3776 | [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])), | |
3777 | [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])), | |
3778 | [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])), | |
3779 | [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])), | |
3780 | #ifdef CONFIG_X86_64 | |
3781 | [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])), | |
3782 | [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])), | |
3783 | [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])), | |
3784 | [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])), | |
3785 | [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])), | |
3786 | [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])), | |
3787 | [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])), | |
3788 | [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])), | |
3789 | #endif | |
3790 | [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)) | |
3791 | : "cc", "memory" | |
3792 | , R"bx", R"di", R"si" | |
3793 | #ifdef CONFIG_X86_64 | |
3794 | , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" | |
3795 | #endif | |
3796 | ); | |
3797 | ||
3798 | vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) | |
3799 | | (1 << VCPU_EXREG_PDPTR)); | |
3800 | vcpu->arch.regs_dirty = 0; | |
3801 | ||
3802 | if (vcpu->arch.switch_db_regs) | |
3803 | get_debugreg(vcpu->arch.dr6, 6); | |
3804 | ||
3805 | vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD); | |
3806 | if (vmx->rmode.irq.pending) | |
3807 | fixup_rmode_irq(vmx); | |
3808 | ||
3809 | asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS)); | |
3810 | vmx->launched = 1; | |
3811 | ||
3812 | vmx_complete_interrupts(vmx); | |
3813 | } | |
3814 | ||
3815 | #undef R | |
3816 | #undef Q | |
3817 | ||
3818 | static void vmx_free_vmcs(struct kvm_vcpu *vcpu) | |
3819 | { | |
3820 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3821 | ||
3822 | if (vmx->vmcs) { | |
3823 | vcpu_clear(vmx); | |
3824 | free_vmcs(vmx->vmcs); | |
3825 | vmx->vmcs = NULL; | |
3826 | } | |
3827 | } | |
3828 | ||
3829 | static void vmx_free_vcpu(struct kvm_vcpu *vcpu) | |
3830 | { | |
3831 | struct vcpu_vmx *vmx = to_vmx(vcpu); | |
3832 | ||
3833 | spin_lock(&vmx_vpid_lock); | |
3834 | if (vmx->vpid != 0) | |
3835 | __clear_bit(vmx->vpid, vmx_vpid_bitmap); | |
3836 | spin_unlock(&vmx_vpid_lock); | |
3837 | vmx_free_vmcs(vcpu); | |
3838 | kfree(vmx->guest_msrs); | |
3839 | kvm_vcpu_uninit(vcpu); | |
3840 | kmem_cache_free(kvm_vcpu_cache, vmx); | |
3841 | } | |
3842 | ||
3843 | static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) | |
3844 | { | |
3845 | int err; | |
3846 | struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
3847 | int cpu; | |
3848 | ||
3849 | if (!vmx) | |
3850 | return ERR_PTR(-ENOMEM); | |
3851 | ||
3852 | allocate_vpid(vmx); | |
3853 | ||
3854 | err = kvm_vcpu_init(&vmx->vcpu, kvm, id); | |
3855 | if (err) | |
3856 | goto free_vcpu; | |
3857 | ||
3858 | vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3859 | if (!vmx->guest_msrs) { | |
3860 | err = -ENOMEM; | |
3861 | goto uninit_vcpu; | |
3862 | } | |
3863 | ||
3864 | vmx->vmcs = alloc_vmcs(); | |
3865 | if (!vmx->vmcs) | |
3866 | goto free_msrs; | |
3867 | ||
3868 | vmcs_clear(vmx->vmcs); | |
3869 | ||
3870 | cpu = get_cpu(); | |
3871 | vmx_vcpu_load(&vmx->vcpu, cpu); | |
3872 | err = vmx_vcpu_setup(vmx); | |
3873 | vmx_vcpu_put(&vmx->vcpu); | |
3874 | put_cpu(); | |
3875 | if (err) | |
3876 | goto free_vmcs; | |
3877 | if (vm_need_virtualize_apic_accesses(kvm)) | |
3878 | if (alloc_apic_access_page(kvm) != 0) | |
3879 | goto free_vmcs; | |
3880 | ||
3881 | if (enable_ept) { | |
3882 | if (!kvm->arch.ept_identity_map_addr) | |
3883 | kvm->arch.ept_identity_map_addr = | |
3884 | VMX_EPT_IDENTITY_PAGETABLE_ADDR; | |
3885 | if (alloc_identity_pagetable(kvm) != 0) | |
3886 | goto free_vmcs; | |
3887 | } | |
3888 | ||
3889 | return &vmx->vcpu; | |
3890 | ||
3891 | free_vmcs: | |
3892 | free_vmcs(vmx->vmcs); | |
3893 | free_msrs: | |
3894 | kfree(vmx->guest_msrs); | |
3895 | uninit_vcpu: | |
3896 | kvm_vcpu_uninit(&vmx->vcpu); | |
3897 | free_vcpu: | |
3898 | kmem_cache_free(kvm_vcpu_cache, vmx); | |
3899 | return ERR_PTR(err); | |
3900 | } | |
3901 | ||
3902 | static void __init vmx_check_processor_compat(void *rtn) | |
3903 | { | |
3904 | struct vmcs_config vmcs_conf; | |
3905 | ||
3906 | *(int *)rtn = 0; | |
3907 | if (setup_vmcs_config(&vmcs_conf) < 0) | |
3908 | *(int *)rtn = -EIO; | |
3909 | if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) { | |
3910 | printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n", | |
3911 | smp_processor_id()); | |
3912 | *(int *)rtn = -EIO; | |
3913 | } | |
3914 | } | |
3915 | ||
3916 | static int get_ept_level(void) | |
3917 | { | |
3918 | return VMX_EPT_DEFAULT_GAW + 1; | |
3919 | } | |
3920 | ||
3921 | static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) | |
3922 | { | |
3923 | u64 ret; | |
3924 | ||
3925 | /* For VT-d and EPT combination | |
3926 | * 1. MMIO: always map as UC | |
3927 | * 2. EPT with VT-d: | |
3928 | * a. VT-d without snooping control feature: can't guarantee the | |
3929 | * result, try to trust guest. | |
3930 | * b. VT-d with snooping control feature: snooping control feature of | |
3931 | * VT-d engine can guarantee the cache correctness. Just set it | |
3932 | * to WB to keep consistent with host. So the same as item 3. | |
3933 | * 3. EPT without VT-d: always map as WB and set IGMT=1 to keep | |
3934 | * consistent with host MTRR | |
3935 | */ | |
3936 | if (is_mmio) | |
3937 | ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT; | |
3938 | else if (vcpu->kvm->arch.iommu_domain && | |
3939 | !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)) | |
3940 | ret = kvm_get_guest_memory_type(vcpu, gfn) << | |
3941 | VMX_EPT_MT_EPTE_SHIFT; | |
3942 | else | |
3943 | ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT) | |
3944 | | VMX_EPT_IGMT_BIT; | |
3945 | ||
3946 | return ret; | |
3947 | } | |
3948 | ||
3949 | static const struct trace_print_flags vmx_exit_reasons_str[] = { | |
3950 | { EXIT_REASON_EXCEPTION_NMI, "exception" }, | |
3951 | { EXIT_REASON_EXTERNAL_INTERRUPT, "ext_irq" }, | |
3952 | { EXIT_REASON_TRIPLE_FAULT, "triple_fault" }, | |
3953 | { EXIT_REASON_NMI_WINDOW, "nmi_window" }, | |
3954 | { EXIT_REASON_IO_INSTRUCTION, "io_instruction" }, | |
3955 | { EXIT_REASON_CR_ACCESS, "cr_access" }, | |
3956 | { EXIT_REASON_DR_ACCESS, "dr_access" }, | |
3957 | { EXIT_REASON_CPUID, "cpuid" }, | |
3958 | { EXIT_REASON_MSR_READ, "rdmsr" }, | |
3959 | { EXIT_REASON_MSR_WRITE, "wrmsr" }, | |
3960 | { EXIT_REASON_PENDING_INTERRUPT, "interrupt_window" }, | |
3961 | { EXIT_REASON_HLT, "halt" }, | |
3962 | { EXIT_REASON_INVLPG, "invlpg" }, | |
3963 | { EXIT_REASON_VMCALL, "hypercall" }, | |
3964 | { EXIT_REASON_TPR_BELOW_THRESHOLD, "tpr_below_thres" }, | |
3965 | { EXIT_REASON_APIC_ACCESS, "apic_access" }, | |
3966 | { EXIT_REASON_WBINVD, "wbinvd" }, | |
3967 | { EXIT_REASON_TASK_SWITCH, "task_switch" }, | |
3968 | { EXIT_REASON_EPT_VIOLATION, "ept_violation" }, | |
3969 | { -1, NULL } | |
3970 | }; | |
3971 | ||
3972 | static bool vmx_gb_page_enable(void) | |
3973 | { | |
3974 | return false; | |
3975 | } | |
3976 | ||
3977 | static struct kvm_x86_ops vmx_x86_ops = { | |
3978 | .cpu_has_kvm_support = cpu_has_kvm_support, | |
3979 | .disabled_by_bios = vmx_disabled_by_bios, | |
3980 | .hardware_setup = hardware_setup, | |
3981 | .hardware_unsetup = hardware_unsetup, | |
3982 | .check_processor_compatibility = vmx_check_processor_compat, | |
3983 | .hardware_enable = hardware_enable, | |
3984 | .hardware_disable = hardware_disable, | |
3985 | .cpu_has_accelerated_tpr = report_flexpriority, | |
3986 | ||
3987 | .vcpu_create = vmx_create_vcpu, | |
3988 | .vcpu_free = vmx_free_vcpu, | |
3989 | .vcpu_reset = vmx_vcpu_reset, | |
3990 | ||
3991 | .prepare_guest_switch = vmx_save_host_state, | |
3992 | .vcpu_load = vmx_vcpu_load, | |
3993 | .vcpu_put = vmx_vcpu_put, | |
3994 | ||
3995 | .set_guest_debug = set_guest_debug, | |
3996 | .get_msr = vmx_get_msr, | |
3997 | .set_msr = vmx_set_msr, | |
3998 | .get_segment_base = vmx_get_segment_base, | |
3999 | .get_segment = vmx_get_segment, | |
4000 | .set_segment = vmx_set_segment, | |
4001 | .get_cpl = vmx_get_cpl, | |
4002 | .get_cs_db_l_bits = vmx_get_cs_db_l_bits, | |
4003 | .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits, | |
4004 | .set_cr0 = vmx_set_cr0, | |
4005 | .set_cr3 = vmx_set_cr3, | |
4006 | .set_cr4 = vmx_set_cr4, | |
4007 | .set_efer = vmx_set_efer, | |
4008 | .get_idt = vmx_get_idt, | |
4009 | .set_idt = vmx_set_idt, | |
4010 | .get_gdt = vmx_get_gdt, | |
4011 | .set_gdt = vmx_set_gdt, | |
4012 | .cache_reg = vmx_cache_reg, | |
4013 | .get_rflags = vmx_get_rflags, | |
4014 | .set_rflags = vmx_set_rflags, | |
4015 | ||
4016 | .tlb_flush = vmx_flush_tlb, | |
4017 | ||
4018 | .run = vmx_vcpu_run, | |
4019 | .handle_exit = vmx_handle_exit, | |
4020 | .skip_emulated_instruction = skip_emulated_instruction, | |
4021 | .set_interrupt_shadow = vmx_set_interrupt_shadow, | |
4022 | .get_interrupt_shadow = vmx_get_interrupt_shadow, | |
4023 | .patch_hypercall = vmx_patch_hypercall, | |
4024 | .set_irq = vmx_inject_irq, | |
4025 | .set_nmi = vmx_inject_nmi, | |
4026 | .queue_exception = vmx_queue_exception, | |
4027 | .interrupt_allowed = vmx_interrupt_allowed, | |
4028 | .nmi_allowed = vmx_nmi_allowed, | |
4029 | .get_nmi_mask = vmx_get_nmi_mask, | |
4030 | .set_nmi_mask = vmx_set_nmi_mask, | |
4031 | .enable_nmi_window = enable_nmi_window, | |
4032 | .enable_irq_window = enable_irq_window, | |
4033 | .update_cr8_intercept = update_cr8_intercept, | |
4034 | ||
4035 | .set_tss_addr = vmx_set_tss_addr, | |
4036 | .get_tdp_level = get_ept_level, | |
4037 | .get_mt_mask = vmx_get_mt_mask, | |
4038 | ||
4039 | .exit_reasons_str = vmx_exit_reasons_str, | |
4040 | .gb_page_enable = vmx_gb_page_enable, | |
4041 | }; | |
4042 | ||
4043 | static int __init vmx_init(void) | |
4044 | { | |
4045 | int r, i; | |
4046 | ||
4047 | rdmsrl_safe(MSR_EFER, &host_efer); | |
4048 | ||
4049 | for (i = 0; i < NR_VMX_MSR; ++i) | |
4050 | kvm_define_shared_msr(i, vmx_msr_index[i]); | |
4051 | ||
4052 | vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL); | |
4053 | if (!vmx_io_bitmap_a) | |
4054 | return -ENOMEM; | |
4055 | ||
4056 | vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL); | |
4057 | if (!vmx_io_bitmap_b) { | |
4058 | r = -ENOMEM; | |
4059 | goto out; | |
4060 | } | |
4061 | ||
4062 | vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL); | |
4063 | if (!vmx_msr_bitmap_legacy) { | |
4064 | r = -ENOMEM; | |
4065 | goto out1; | |
4066 | } | |
4067 | ||
4068 | vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL); | |
4069 | if (!vmx_msr_bitmap_longmode) { | |
4070 | r = -ENOMEM; | |
4071 | goto out2; | |
4072 | } | |
4073 | ||
4074 | /* | |
4075 | * Allow direct access to the PC debug port (it is often used for I/O | |
4076 | * delays, but the vmexits simply slow things down). | |
4077 | */ | |
4078 | memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE); | |
4079 | clear_bit(0x80, vmx_io_bitmap_a); | |
4080 | ||
4081 | memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE); | |
4082 | ||
4083 | memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE); | |
4084 | memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE); | |
4085 | ||
4086 | set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */ | |
4087 | ||
4088 | r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE); | |
4089 | if (r) | |
4090 | goto out3; | |
4091 | ||
4092 | vmx_disable_intercept_for_msr(MSR_FS_BASE, false); | |
4093 | vmx_disable_intercept_for_msr(MSR_GS_BASE, false); | |
4094 | vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true); | |
4095 | vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false); | |
4096 | vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false); | |
4097 | vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false); | |
4098 | ||
4099 | if (enable_ept) { | |
4100 | bypass_guest_pf = 0; | |
4101 | kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK | | |
4102 | VMX_EPT_WRITABLE_MASK); | |
4103 | kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull, | |
4104 | VMX_EPT_EXECUTABLE_MASK); | |
4105 | kvm_enable_tdp(); | |
4106 | } else | |
4107 | kvm_disable_tdp(); | |
4108 | ||
4109 | if (bypass_guest_pf) | |
4110 | kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull); | |
4111 | ||
4112 | return 0; | |
4113 | ||
4114 | out3: | |
4115 | free_page((unsigned long)vmx_msr_bitmap_longmode); | |
4116 | out2: | |
4117 | free_page((unsigned long)vmx_msr_bitmap_legacy); | |
4118 | out1: | |
4119 | free_page((unsigned long)vmx_io_bitmap_b); | |
4120 | out: | |
4121 | free_page((unsigned long)vmx_io_bitmap_a); | |
4122 | return r; | |
4123 | } | |
4124 | ||
4125 | static void __exit vmx_exit(void) | |
4126 | { | |
4127 | free_page((unsigned long)vmx_msr_bitmap_legacy); | |
4128 | free_page((unsigned long)vmx_msr_bitmap_longmode); | |
4129 | free_page((unsigned long)vmx_io_bitmap_b); | |
4130 | free_page((unsigned long)vmx_io_bitmap_a); | |
4131 | ||
4132 | kvm_exit(); | |
4133 | } | |
4134 | ||
4135 | module_init(vmx_init) | |
4136 | module_exit(vmx_exit) |