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Merge tag 'md/4.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
[mirror_ubuntu-artful-kernel.git] / arch / x86 / kvm / svm.c
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * AMD SVM support
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
8 *
9 * Authors:
10 * Yaniv Kamay <yaniv@qumranet.com>
11 * Avi Kivity <avi@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 #define pr_fmt(fmt) "SVM: " fmt
19
20 #include <linux/kvm_host.h>
21
22 #include "irq.h"
23 #include "mmu.h"
24 #include "kvm_cache_regs.h"
25 #include "x86.h"
26 #include "cpuid.h"
27 #include "pmu.h"
28
29 #include <linux/module.h>
30 #include <linux/mod_devicetable.h>
31 #include <linux/kernel.h>
32 #include <linux/vmalloc.h>
33 #include <linux/highmem.h>
34 #include <linux/sched.h>
35 #include <linux/trace_events.h>
36 #include <linux/slab.h>
37 #include <linux/amd-iommu.h>
38 #include <linux/hashtable.h>
39 #include <linux/frame.h>
40
41 #include <asm/apic.h>
42 #include <asm/perf_event.h>
43 #include <asm/tlbflush.h>
44 #include <asm/desc.h>
45 #include <asm/debugreg.h>
46 #include <asm/kvm_para.h>
47 #include <asm/irq_remapping.h>
48
49 #include <asm/virtext.h>
50 #include "trace.h"
51
52 #define __ex(x) __kvm_handle_fault_on_reboot(x)
53
54 MODULE_AUTHOR("Qumranet");
55 MODULE_LICENSE("GPL");
56
57 static const struct x86_cpu_id svm_cpu_id[] = {
58 X86_FEATURE_MATCH(X86_FEATURE_SVM),
59 {}
60 };
61 MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
62
63 #define IOPM_ALLOC_ORDER 2
64 #define MSRPM_ALLOC_ORDER 1
65
66 #define SEG_TYPE_LDT 2
67 #define SEG_TYPE_BUSY_TSS16 3
68
69 #define SVM_FEATURE_NPT (1 << 0)
70 #define SVM_FEATURE_LBRV (1 << 1)
71 #define SVM_FEATURE_SVML (1 << 2)
72 #define SVM_FEATURE_NRIP (1 << 3)
73 #define SVM_FEATURE_TSC_RATE (1 << 4)
74 #define SVM_FEATURE_VMCB_CLEAN (1 << 5)
75 #define SVM_FEATURE_FLUSH_ASID (1 << 6)
76 #define SVM_FEATURE_DECODE_ASSIST (1 << 7)
77 #define SVM_FEATURE_PAUSE_FILTER (1 << 10)
78
79 #define SVM_AVIC_DOORBELL 0xc001011b
80
81 #define NESTED_EXIT_HOST 0 /* Exit handled on host level */
82 #define NESTED_EXIT_DONE 1 /* Exit caused nested vmexit */
83 #define NESTED_EXIT_CONTINUE 2 /* Further checks needed */
84
85 #define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
86
87 #define TSC_RATIO_RSVD 0xffffff0000000000ULL
88 #define TSC_RATIO_MIN 0x0000000000000001ULL
89 #define TSC_RATIO_MAX 0x000000ffffffffffULL
90
91 #define AVIC_HPA_MASK ~((0xFFFULL << 52) | 0xFFF)
92
93 /*
94 * 0xff is broadcast, so the max index allowed for physical APIC ID
95 * table is 0xfe. APIC IDs above 0xff are reserved.
96 */
97 #define AVIC_MAX_PHYSICAL_ID_COUNT 255
98
99 #define AVIC_UNACCEL_ACCESS_WRITE_MASK 1
100 #define AVIC_UNACCEL_ACCESS_OFFSET_MASK 0xFF0
101 #define AVIC_UNACCEL_ACCESS_VECTOR_MASK 0xFFFFFFFF
102
103 /* AVIC GATAG is encoded using VM and VCPU IDs */
104 #define AVIC_VCPU_ID_BITS 8
105 #define AVIC_VCPU_ID_MASK ((1 << AVIC_VCPU_ID_BITS) - 1)
106
107 #define AVIC_VM_ID_BITS 24
108 #define AVIC_VM_ID_NR (1 << AVIC_VM_ID_BITS)
109 #define AVIC_VM_ID_MASK ((1 << AVIC_VM_ID_BITS) - 1)
110
111 #define AVIC_GATAG(x, y) (((x & AVIC_VM_ID_MASK) << AVIC_VCPU_ID_BITS) | \
112 (y & AVIC_VCPU_ID_MASK))
113 #define AVIC_GATAG_TO_VMID(x) ((x >> AVIC_VCPU_ID_BITS) & AVIC_VM_ID_MASK)
114 #define AVIC_GATAG_TO_VCPUID(x) (x & AVIC_VCPU_ID_MASK)
115
116 static bool erratum_383_found __read_mostly;
117
118 static const u32 host_save_user_msrs[] = {
119 #ifdef CONFIG_X86_64
120 MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
121 MSR_FS_BASE,
122 #endif
123 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
124 MSR_TSC_AUX,
125 };
126
127 #define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
128
129 struct kvm_vcpu;
130
131 struct nested_state {
132 struct vmcb *hsave;
133 u64 hsave_msr;
134 u64 vm_cr_msr;
135 u64 vmcb;
136
137 /* These are the merged vectors */
138 u32 *msrpm;
139
140 /* gpa pointers to the real vectors */
141 u64 vmcb_msrpm;
142 u64 vmcb_iopm;
143
144 /* A VMEXIT is required but not yet emulated */
145 bool exit_required;
146
147 /* cache for intercepts of the guest */
148 u32 intercept_cr;
149 u32 intercept_dr;
150 u32 intercept_exceptions;
151 u64 intercept;
152
153 /* Nested Paging related state */
154 u64 nested_cr3;
155 };
156
157 #define MSRPM_OFFSETS 16
158 static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
159
160 /*
161 * Set osvw_len to higher value when updated Revision Guides
162 * are published and we know what the new status bits are
163 */
164 static uint64_t osvw_len = 4, osvw_status;
165
166 struct vcpu_svm {
167 struct kvm_vcpu vcpu;
168 struct vmcb *vmcb;
169 unsigned long vmcb_pa;
170 struct svm_cpu_data *svm_data;
171 uint64_t asid_generation;
172 uint64_t sysenter_esp;
173 uint64_t sysenter_eip;
174 uint64_t tsc_aux;
175
176 u64 next_rip;
177
178 u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
179 struct {
180 u16 fs;
181 u16 gs;
182 u16 ldt;
183 u64 gs_base;
184 } host;
185
186 u32 *msrpm;
187
188 ulong nmi_iret_rip;
189
190 struct nested_state nested;
191
192 bool nmi_singlestep;
193 u64 nmi_singlestep_guest_rflags;
194
195 unsigned int3_injected;
196 unsigned long int3_rip;
197
198 /* cached guest cpuid flags for faster access */
199 bool nrips_enabled : 1;
200
201 u32 ldr_reg;
202 struct page *avic_backing_page;
203 u64 *avic_physical_id_cache;
204 bool avic_is_running;
205
206 /*
207 * Per-vcpu list of struct amd_svm_iommu_ir:
208 * This is used mainly to store interrupt remapping information used
209 * when update the vcpu affinity. This avoids the need to scan for
210 * IRTE and try to match ga_tag in the IOMMU driver.
211 */
212 struct list_head ir_list;
213 spinlock_t ir_list_lock;
214 };
215
216 /*
217 * This is a wrapper of struct amd_iommu_ir_data.
218 */
219 struct amd_svm_iommu_ir {
220 struct list_head node; /* Used by SVM for per-vcpu ir_list */
221 void *data; /* Storing pointer to struct amd_ir_data */
222 };
223
224 #define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFF)
225 #define AVIC_LOGICAL_ID_ENTRY_VALID_MASK (1 << 31)
226
227 #define AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK (0xFFULL)
228 #define AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK (0xFFFFFFFFFFULL << 12)
229 #define AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK (1ULL << 62)
230 #define AVIC_PHYSICAL_ID_ENTRY_VALID_MASK (1ULL << 63)
231
232 static DEFINE_PER_CPU(u64, current_tsc_ratio);
233 #define TSC_RATIO_DEFAULT 0x0100000000ULL
234
235 #define MSR_INVALID 0xffffffffU
236
237 static const struct svm_direct_access_msrs {
238 u32 index; /* Index of the MSR */
239 bool always; /* True if intercept is always on */
240 } direct_access_msrs[] = {
241 { .index = MSR_STAR, .always = true },
242 { .index = MSR_IA32_SYSENTER_CS, .always = true },
243 #ifdef CONFIG_X86_64
244 { .index = MSR_GS_BASE, .always = true },
245 { .index = MSR_FS_BASE, .always = true },
246 { .index = MSR_KERNEL_GS_BASE, .always = true },
247 { .index = MSR_LSTAR, .always = true },
248 { .index = MSR_CSTAR, .always = true },
249 { .index = MSR_SYSCALL_MASK, .always = true },
250 #endif
251 { .index = MSR_IA32_LASTBRANCHFROMIP, .always = false },
252 { .index = MSR_IA32_LASTBRANCHTOIP, .always = false },
253 { .index = MSR_IA32_LASTINTFROMIP, .always = false },
254 { .index = MSR_IA32_LASTINTTOIP, .always = false },
255 { .index = MSR_INVALID, .always = false },
256 };
257
258 /* enable NPT for AMD64 and X86 with PAE */
259 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
260 static bool npt_enabled = true;
261 #else
262 static bool npt_enabled;
263 #endif
264
265 /* allow nested paging (virtualized MMU) for all guests */
266 static int npt = true;
267 module_param(npt, int, S_IRUGO);
268
269 /* allow nested virtualization in KVM/SVM */
270 static int nested = true;
271 module_param(nested, int, S_IRUGO);
272
273 /* enable / disable AVIC */
274 static int avic;
275 #ifdef CONFIG_X86_LOCAL_APIC
276 module_param(avic, int, S_IRUGO);
277 #endif
278
279 /* enable/disable Virtual VMLOAD VMSAVE */
280 static int vls = true;
281 module_param(vls, int, 0444);
282
283 /* AVIC VM ID bit masks and lock */
284 static DECLARE_BITMAP(avic_vm_id_bitmap, AVIC_VM_ID_NR);
285 static DEFINE_SPINLOCK(avic_vm_id_lock);
286
287 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
288 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
289 static void svm_complete_interrupts(struct vcpu_svm *svm);
290
291 static int nested_svm_exit_handled(struct vcpu_svm *svm);
292 static int nested_svm_intercept(struct vcpu_svm *svm);
293 static int nested_svm_vmexit(struct vcpu_svm *svm);
294 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
295 bool has_error_code, u32 error_code);
296
297 enum {
298 VMCB_INTERCEPTS, /* Intercept vectors, TSC offset,
299 pause filter count */
300 VMCB_PERM_MAP, /* IOPM Base and MSRPM Base */
301 VMCB_ASID, /* ASID */
302 VMCB_INTR, /* int_ctl, int_vector */
303 VMCB_NPT, /* npt_en, nCR3, gPAT */
304 VMCB_CR, /* CR0, CR3, CR4, EFER */
305 VMCB_DR, /* DR6, DR7 */
306 VMCB_DT, /* GDT, IDT */
307 VMCB_SEG, /* CS, DS, SS, ES, CPL */
308 VMCB_CR2, /* CR2 only */
309 VMCB_LBR, /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */
310 VMCB_AVIC, /* AVIC APIC_BAR, AVIC APIC_BACKING_PAGE,
311 * AVIC PHYSICAL_TABLE pointer,
312 * AVIC LOGICAL_TABLE pointer
313 */
314 VMCB_DIRTY_MAX,
315 };
316
317 /* TPR and CR2 are always written before VMRUN */
318 #define VMCB_ALWAYS_DIRTY_MASK ((1U << VMCB_INTR) | (1U << VMCB_CR2))
319
320 #define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL
321
322 static inline void mark_all_dirty(struct vmcb *vmcb)
323 {
324 vmcb->control.clean = 0;
325 }
326
327 static inline void mark_all_clean(struct vmcb *vmcb)
328 {
329 vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1)
330 & ~VMCB_ALWAYS_DIRTY_MASK;
331 }
332
333 static inline void mark_dirty(struct vmcb *vmcb, int bit)
334 {
335 vmcb->control.clean &= ~(1 << bit);
336 }
337
338 static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
339 {
340 return container_of(vcpu, struct vcpu_svm, vcpu);
341 }
342
343 static inline void avic_update_vapic_bar(struct vcpu_svm *svm, u64 data)
344 {
345 svm->vmcb->control.avic_vapic_bar = data & VMCB_AVIC_APIC_BAR_MASK;
346 mark_dirty(svm->vmcb, VMCB_AVIC);
347 }
348
349 static inline bool avic_vcpu_is_running(struct kvm_vcpu *vcpu)
350 {
351 struct vcpu_svm *svm = to_svm(vcpu);
352 u64 *entry = svm->avic_physical_id_cache;
353
354 if (!entry)
355 return false;
356
357 return (READ_ONCE(*entry) & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK);
358 }
359
360 static void recalc_intercepts(struct vcpu_svm *svm)
361 {
362 struct vmcb_control_area *c, *h;
363 struct nested_state *g;
364
365 mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
366
367 if (!is_guest_mode(&svm->vcpu))
368 return;
369
370 c = &svm->vmcb->control;
371 h = &svm->nested.hsave->control;
372 g = &svm->nested;
373
374 c->intercept_cr = h->intercept_cr | g->intercept_cr;
375 c->intercept_dr = h->intercept_dr | g->intercept_dr;
376 c->intercept_exceptions = h->intercept_exceptions | g->intercept_exceptions;
377 c->intercept = h->intercept | g->intercept;
378 }
379
380 static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
381 {
382 if (is_guest_mode(&svm->vcpu))
383 return svm->nested.hsave;
384 else
385 return svm->vmcb;
386 }
387
388 static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
389 {
390 struct vmcb *vmcb = get_host_vmcb(svm);
391
392 vmcb->control.intercept_cr |= (1U << bit);
393
394 recalc_intercepts(svm);
395 }
396
397 static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
398 {
399 struct vmcb *vmcb = get_host_vmcb(svm);
400
401 vmcb->control.intercept_cr &= ~(1U << bit);
402
403 recalc_intercepts(svm);
404 }
405
406 static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
407 {
408 struct vmcb *vmcb = get_host_vmcb(svm);
409
410 return vmcb->control.intercept_cr & (1U << bit);
411 }
412
413 static inline void set_dr_intercepts(struct vcpu_svm *svm)
414 {
415 struct vmcb *vmcb = get_host_vmcb(svm);
416
417 vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
418 | (1 << INTERCEPT_DR1_READ)
419 | (1 << INTERCEPT_DR2_READ)
420 | (1 << INTERCEPT_DR3_READ)
421 | (1 << INTERCEPT_DR4_READ)
422 | (1 << INTERCEPT_DR5_READ)
423 | (1 << INTERCEPT_DR6_READ)
424 | (1 << INTERCEPT_DR7_READ)
425 | (1 << INTERCEPT_DR0_WRITE)
426 | (1 << INTERCEPT_DR1_WRITE)
427 | (1 << INTERCEPT_DR2_WRITE)
428 | (1 << INTERCEPT_DR3_WRITE)
429 | (1 << INTERCEPT_DR4_WRITE)
430 | (1 << INTERCEPT_DR5_WRITE)
431 | (1 << INTERCEPT_DR6_WRITE)
432 | (1 << INTERCEPT_DR7_WRITE);
433
434 recalc_intercepts(svm);
435 }
436
437 static inline void clr_dr_intercepts(struct vcpu_svm *svm)
438 {
439 struct vmcb *vmcb = get_host_vmcb(svm);
440
441 vmcb->control.intercept_dr = 0;
442
443 recalc_intercepts(svm);
444 }
445
446 static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
447 {
448 struct vmcb *vmcb = get_host_vmcb(svm);
449
450 vmcb->control.intercept_exceptions |= (1U << bit);
451
452 recalc_intercepts(svm);
453 }
454
455 static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
456 {
457 struct vmcb *vmcb = get_host_vmcb(svm);
458
459 vmcb->control.intercept_exceptions &= ~(1U << bit);
460
461 recalc_intercepts(svm);
462 }
463
464 static inline void set_intercept(struct vcpu_svm *svm, int bit)
465 {
466 struct vmcb *vmcb = get_host_vmcb(svm);
467
468 vmcb->control.intercept |= (1ULL << bit);
469
470 recalc_intercepts(svm);
471 }
472
473 static inline void clr_intercept(struct vcpu_svm *svm, int bit)
474 {
475 struct vmcb *vmcb = get_host_vmcb(svm);
476
477 vmcb->control.intercept &= ~(1ULL << bit);
478
479 recalc_intercepts(svm);
480 }
481
482 static inline void enable_gif(struct vcpu_svm *svm)
483 {
484 svm->vcpu.arch.hflags |= HF_GIF_MASK;
485 }
486
487 static inline void disable_gif(struct vcpu_svm *svm)
488 {
489 svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
490 }
491
492 static inline bool gif_set(struct vcpu_svm *svm)
493 {
494 return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
495 }
496
497 static unsigned long iopm_base;
498
499 struct kvm_ldttss_desc {
500 u16 limit0;
501 u16 base0;
502 unsigned base1:8, type:5, dpl:2, p:1;
503 unsigned limit1:4, zero0:3, g:1, base2:8;
504 u32 base3;
505 u32 zero1;
506 } __attribute__((packed));
507
508 struct svm_cpu_data {
509 int cpu;
510
511 u64 asid_generation;
512 u32 max_asid;
513 u32 next_asid;
514 struct kvm_ldttss_desc *tss_desc;
515
516 struct page *save_area;
517 };
518
519 static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
520
521 struct svm_init_data {
522 int cpu;
523 int r;
524 };
525
526 static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
527
528 #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
529 #define MSRS_RANGE_SIZE 2048
530 #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
531
532 static u32 svm_msrpm_offset(u32 msr)
533 {
534 u32 offset;
535 int i;
536
537 for (i = 0; i < NUM_MSR_MAPS; i++) {
538 if (msr < msrpm_ranges[i] ||
539 msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
540 continue;
541
542 offset = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
543 offset += (i * MSRS_RANGE_SIZE); /* add range offset */
544
545 /* Now we have the u8 offset - but need the u32 offset */
546 return offset / 4;
547 }
548
549 /* MSR not in any range */
550 return MSR_INVALID;
551 }
552
553 #define MAX_INST_SIZE 15
554
555 static inline void clgi(void)
556 {
557 asm volatile (__ex(SVM_CLGI));
558 }
559
560 static inline void stgi(void)
561 {
562 asm volatile (__ex(SVM_STGI));
563 }
564
565 static inline void invlpga(unsigned long addr, u32 asid)
566 {
567 asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid));
568 }
569
570 static int get_npt_level(void)
571 {
572 #ifdef CONFIG_X86_64
573 return PT64_ROOT_LEVEL;
574 #else
575 return PT32E_ROOT_LEVEL;
576 #endif
577 }
578
579 static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
580 {
581 vcpu->arch.efer = efer;
582 if (!npt_enabled && !(efer & EFER_LMA))
583 efer &= ~EFER_LME;
584
585 to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
586 mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
587 }
588
589 static int is_external_interrupt(u32 info)
590 {
591 info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
592 return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
593 }
594
595 static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
596 {
597 struct vcpu_svm *svm = to_svm(vcpu);
598 u32 ret = 0;
599
600 if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
601 ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
602 return ret;
603 }
604
605 static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
606 {
607 struct vcpu_svm *svm = to_svm(vcpu);
608
609 if (mask == 0)
610 svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
611 else
612 svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
613
614 }
615
616 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
617 {
618 struct vcpu_svm *svm = to_svm(vcpu);
619
620 if (svm->vmcb->control.next_rip != 0) {
621 WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
622 svm->next_rip = svm->vmcb->control.next_rip;
623 }
624
625 if (!svm->next_rip) {
626 if (emulate_instruction(vcpu, EMULTYPE_SKIP) !=
627 EMULATE_DONE)
628 printk(KERN_DEBUG "%s: NOP\n", __func__);
629 return;
630 }
631 if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
632 printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
633 __func__, kvm_rip_read(vcpu), svm->next_rip);
634
635 kvm_rip_write(vcpu, svm->next_rip);
636 svm_set_interrupt_shadow(vcpu, 0);
637 }
638
639 static void svm_queue_exception(struct kvm_vcpu *vcpu)
640 {
641 struct vcpu_svm *svm = to_svm(vcpu);
642 unsigned nr = vcpu->arch.exception.nr;
643 bool has_error_code = vcpu->arch.exception.has_error_code;
644 bool reinject = vcpu->arch.exception.reinject;
645 u32 error_code = vcpu->arch.exception.error_code;
646
647 /*
648 * If we are within a nested VM we'd better #VMEXIT and let the guest
649 * handle the exception
650 */
651 if (!reinject &&
652 nested_svm_check_exception(svm, nr, has_error_code, error_code))
653 return;
654
655 if (nr == BP_VECTOR && !static_cpu_has(X86_FEATURE_NRIPS)) {
656 unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu);
657
658 /*
659 * For guest debugging where we have to reinject #BP if some
660 * INT3 is guest-owned:
661 * Emulate nRIP by moving RIP forward. Will fail if injection
662 * raises a fault that is not intercepted. Still better than
663 * failing in all cases.
664 */
665 skip_emulated_instruction(&svm->vcpu);
666 rip = kvm_rip_read(&svm->vcpu);
667 svm->int3_rip = rip + svm->vmcb->save.cs.base;
668 svm->int3_injected = rip - old_rip;
669 }
670
671 svm->vmcb->control.event_inj = nr
672 | SVM_EVTINJ_VALID
673 | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
674 | SVM_EVTINJ_TYPE_EXEPT;
675 svm->vmcb->control.event_inj_err = error_code;
676 }
677
678 static void svm_init_erratum_383(void)
679 {
680 u32 low, high;
681 int err;
682 u64 val;
683
684 if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
685 return;
686
687 /* Use _safe variants to not break nested virtualization */
688 val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
689 if (err)
690 return;
691
692 val |= (1ULL << 47);
693
694 low = lower_32_bits(val);
695 high = upper_32_bits(val);
696
697 native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);
698
699 erratum_383_found = true;
700 }
701
702 static void svm_init_osvw(struct kvm_vcpu *vcpu)
703 {
704 /*
705 * Guests should see errata 400 and 415 as fixed (assuming that
706 * HLT and IO instructions are intercepted).
707 */
708 vcpu->arch.osvw.length = (osvw_len >= 3) ? (osvw_len) : 3;
709 vcpu->arch.osvw.status = osvw_status & ~(6ULL);
710
711 /*
712 * By increasing VCPU's osvw.length to 3 we are telling the guest that
713 * all osvw.status bits inside that length, including bit 0 (which is
714 * reserved for erratum 298), are valid. However, if host processor's
715 * osvw_len is 0 then osvw_status[0] carries no information. We need to
716 * be conservative here and therefore we tell the guest that erratum 298
717 * is present (because we really don't know).
718 */
719 if (osvw_len == 0 && boot_cpu_data.x86 == 0x10)
720 vcpu->arch.osvw.status |= 1;
721 }
722
723 static int has_svm(void)
724 {
725 const char *msg;
726
727 if (!cpu_has_svm(&msg)) {
728 printk(KERN_INFO "has_svm: %s\n", msg);
729 return 0;
730 }
731
732 return 1;
733 }
734
735 static void svm_hardware_disable(void)
736 {
737 /* Make sure we clean up behind us */
738 if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
739 wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
740
741 cpu_svm_disable();
742
743 amd_pmu_disable_virt();
744 }
745
746 static int svm_hardware_enable(void)
747 {
748
749 struct svm_cpu_data *sd;
750 uint64_t efer;
751 struct desc_struct *gdt;
752 int me = raw_smp_processor_id();
753
754 rdmsrl(MSR_EFER, efer);
755 if (efer & EFER_SVME)
756 return -EBUSY;
757
758 if (!has_svm()) {
759 pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
760 return -EINVAL;
761 }
762 sd = per_cpu(svm_data, me);
763 if (!sd) {
764 pr_err("%s: svm_data is NULL on %d\n", __func__, me);
765 return -EINVAL;
766 }
767
768 sd->asid_generation = 1;
769 sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
770 sd->next_asid = sd->max_asid + 1;
771
772 gdt = get_current_gdt_rw();
773 sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
774
775 wrmsrl(MSR_EFER, efer | EFER_SVME);
776
777 wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
778
779 if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
780 wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
781 __this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
782 }
783
784
785 /*
786 * Get OSVW bits.
787 *
788 * Note that it is possible to have a system with mixed processor
789 * revisions and therefore different OSVW bits. If bits are not the same
790 * on different processors then choose the worst case (i.e. if erratum
791 * is present on one processor and not on another then assume that the
792 * erratum is present everywhere).
793 */
794 if (cpu_has(&boot_cpu_data, X86_FEATURE_OSVW)) {
795 uint64_t len, status = 0;
796 int err;
797
798 len = native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &err);
799 if (!err)
800 status = native_read_msr_safe(MSR_AMD64_OSVW_STATUS,
801 &err);
802
803 if (err)
804 osvw_status = osvw_len = 0;
805 else {
806 if (len < osvw_len)
807 osvw_len = len;
808 osvw_status |= status;
809 osvw_status &= (1ULL << osvw_len) - 1;
810 }
811 } else
812 osvw_status = osvw_len = 0;
813
814 svm_init_erratum_383();
815
816 amd_pmu_enable_virt();
817
818 return 0;
819 }
820
821 static void svm_cpu_uninit(int cpu)
822 {
823 struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
824
825 if (!sd)
826 return;
827
828 per_cpu(svm_data, raw_smp_processor_id()) = NULL;
829 __free_page(sd->save_area);
830 kfree(sd);
831 }
832
833 static int svm_cpu_init(int cpu)
834 {
835 struct svm_cpu_data *sd;
836 int r;
837
838 sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
839 if (!sd)
840 return -ENOMEM;
841 sd->cpu = cpu;
842 sd->save_area = alloc_page(GFP_KERNEL);
843 r = -ENOMEM;
844 if (!sd->save_area)
845 goto err_1;
846
847 per_cpu(svm_data, cpu) = sd;
848
849 return 0;
850
851 err_1:
852 kfree(sd);
853 return r;
854
855 }
856
857 static bool valid_msr_intercept(u32 index)
858 {
859 int i;
860
861 for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
862 if (direct_access_msrs[i].index == index)
863 return true;
864
865 return false;
866 }
867
868 static void set_msr_interception(u32 *msrpm, unsigned msr,
869 int read, int write)
870 {
871 u8 bit_read, bit_write;
872 unsigned long tmp;
873 u32 offset;
874
875 /*
876 * If this warning triggers extend the direct_access_msrs list at the
877 * beginning of the file
878 */
879 WARN_ON(!valid_msr_intercept(msr));
880
881 offset = svm_msrpm_offset(msr);
882 bit_read = 2 * (msr & 0x0f);
883 bit_write = 2 * (msr & 0x0f) + 1;
884 tmp = msrpm[offset];
885
886 BUG_ON(offset == MSR_INVALID);
887
888 read ? clear_bit(bit_read, &tmp) : set_bit(bit_read, &tmp);
889 write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);
890
891 msrpm[offset] = tmp;
892 }
893
894 static void svm_vcpu_init_msrpm(u32 *msrpm)
895 {
896 int i;
897
898 memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
899
900 for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
901 if (!direct_access_msrs[i].always)
902 continue;
903
904 set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
905 }
906 }
907
908 static void add_msr_offset(u32 offset)
909 {
910 int i;
911
912 for (i = 0; i < MSRPM_OFFSETS; ++i) {
913
914 /* Offset already in list? */
915 if (msrpm_offsets[i] == offset)
916 return;
917
918 /* Slot used by another offset? */
919 if (msrpm_offsets[i] != MSR_INVALID)
920 continue;
921
922 /* Add offset to list */
923 msrpm_offsets[i] = offset;
924
925 return;
926 }
927
928 /*
929 * If this BUG triggers the msrpm_offsets table has an overflow. Just
930 * increase MSRPM_OFFSETS in this case.
931 */
932 BUG();
933 }
934
935 static void init_msrpm_offsets(void)
936 {
937 int i;
938
939 memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));
940
941 for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
942 u32 offset;
943
944 offset = svm_msrpm_offset(direct_access_msrs[i].index);
945 BUG_ON(offset == MSR_INVALID);
946
947 add_msr_offset(offset);
948 }
949 }
950
951 static void svm_enable_lbrv(struct vcpu_svm *svm)
952 {
953 u32 *msrpm = svm->msrpm;
954
955 svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
956 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
957 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
958 set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
959 set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
960 }
961
962 static void svm_disable_lbrv(struct vcpu_svm *svm)
963 {
964 u32 *msrpm = svm->msrpm;
965
966 svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
967 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
968 set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
969 set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
970 set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
971 }
972
973 static void disable_nmi_singlestep(struct vcpu_svm *svm)
974 {
975 svm->nmi_singlestep = false;
976 if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) {
977 /* Clear our flags if they were not set by the guest */
978 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
979 svm->vmcb->save.rflags &= ~X86_EFLAGS_TF;
980 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
981 svm->vmcb->save.rflags &= ~X86_EFLAGS_RF;
982 }
983 }
984
985 /* Note:
986 * This hash table is used to map VM_ID to a struct kvm_arch,
987 * when handling AMD IOMMU GALOG notification to schedule in
988 * a particular vCPU.
989 */
990 #define SVM_VM_DATA_HASH_BITS 8
991 static DEFINE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
992 static DEFINE_SPINLOCK(svm_vm_data_hash_lock);
993
994 /* Note:
995 * This function is called from IOMMU driver to notify
996 * SVM to schedule in a particular vCPU of a particular VM.
997 */
998 static int avic_ga_log_notifier(u32 ga_tag)
999 {
1000 unsigned long flags;
1001 struct kvm_arch *ka = NULL;
1002 struct kvm_vcpu *vcpu = NULL;
1003 u32 vm_id = AVIC_GATAG_TO_VMID(ga_tag);
1004 u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);
1005
1006 pr_debug("SVM: %s: vm_id=%#x, vcpu_id=%#x\n", __func__, vm_id, vcpu_id);
1007
1008 spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1009 hash_for_each_possible(svm_vm_data_hash, ka, hnode, vm_id) {
1010 struct kvm *kvm = container_of(ka, struct kvm, arch);
1011 struct kvm_arch *vm_data = &kvm->arch;
1012
1013 if (vm_data->avic_vm_id != vm_id)
1014 continue;
1015 vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
1016 break;
1017 }
1018 spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
1019
1020 if (!vcpu)
1021 return 0;
1022
1023 /* Note:
1024 * At this point, the IOMMU should have already set the pending
1025 * bit in the vAPIC backing page. So, we just need to schedule
1026 * in the vcpu.
1027 */
1028 if (vcpu->mode == OUTSIDE_GUEST_MODE)
1029 kvm_vcpu_wake_up(vcpu);
1030
1031 return 0;
1032 }
1033
1034 static __init int svm_hardware_setup(void)
1035 {
1036 int cpu;
1037 struct page *iopm_pages;
1038 void *iopm_va;
1039 int r;
1040
1041 iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
1042
1043 if (!iopm_pages)
1044 return -ENOMEM;
1045
1046 iopm_va = page_address(iopm_pages);
1047 memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
1048 iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
1049
1050 init_msrpm_offsets();
1051
1052 if (boot_cpu_has(X86_FEATURE_NX))
1053 kvm_enable_efer_bits(EFER_NX);
1054
1055 if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
1056 kvm_enable_efer_bits(EFER_FFXSR);
1057
1058 if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
1059 kvm_has_tsc_control = true;
1060 kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
1061 kvm_tsc_scaling_ratio_frac_bits = 32;
1062 }
1063
1064 if (nested) {
1065 printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
1066 kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
1067 }
1068
1069 for_each_possible_cpu(cpu) {
1070 r = svm_cpu_init(cpu);
1071 if (r)
1072 goto err;
1073 }
1074
1075 if (!boot_cpu_has(X86_FEATURE_NPT))
1076 npt_enabled = false;
1077
1078 if (npt_enabled && !npt) {
1079 printk(KERN_INFO "kvm: Nested Paging disabled\n");
1080 npt_enabled = false;
1081 }
1082
1083 if (npt_enabled) {
1084 printk(KERN_INFO "kvm: Nested Paging enabled\n");
1085 kvm_enable_tdp();
1086 } else
1087 kvm_disable_tdp();
1088
1089 if (avic) {
1090 if (!npt_enabled ||
1091 !boot_cpu_has(X86_FEATURE_AVIC) ||
1092 !IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
1093 avic = false;
1094 } else {
1095 pr_info("AVIC enabled\n");
1096
1097 amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
1098 }
1099 }
1100
1101 if (vls) {
1102 if (!npt_enabled ||
1103 !boot_cpu_has(X86_FEATURE_VIRTUAL_VMLOAD_VMSAVE) ||
1104 !IS_ENABLED(CONFIG_X86_64)) {
1105 vls = false;
1106 } else {
1107 pr_info("Virtual VMLOAD VMSAVE supported\n");
1108 }
1109 }
1110
1111 return 0;
1112
1113 err:
1114 __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
1115 iopm_base = 0;
1116 return r;
1117 }
1118
1119 static __exit void svm_hardware_unsetup(void)
1120 {
1121 int cpu;
1122
1123 for_each_possible_cpu(cpu)
1124 svm_cpu_uninit(cpu);
1125
1126 __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
1127 iopm_base = 0;
1128 }
1129
1130 static void init_seg(struct vmcb_seg *seg)
1131 {
1132 seg->selector = 0;
1133 seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
1134 SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
1135 seg->limit = 0xffff;
1136 seg->base = 0;
1137 }
1138
1139 static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
1140 {
1141 seg->selector = 0;
1142 seg->attrib = SVM_SELECTOR_P_MASK | type;
1143 seg->limit = 0xffff;
1144 seg->base = 0;
1145 }
1146
1147 static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1148 {
1149 struct vcpu_svm *svm = to_svm(vcpu);
1150 u64 g_tsc_offset = 0;
1151
1152 if (is_guest_mode(vcpu)) {
1153 g_tsc_offset = svm->vmcb->control.tsc_offset -
1154 svm->nested.hsave->control.tsc_offset;
1155 svm->nested.hsave->control.tsc_offset = offset;
1156 } else
1157 trace_kvm_write_tsc_offset(vcpu->vcpu_id,
1158 svm->vmcb->control.tsc_offset,
1159 offset);
1160
1161 svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
1162
1163 mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
1164 }
1165
1166 static void avic_init_vmcb(struct vcpu_svm *svm)
1167 {
1168 struct vmcb *vmcb = svm->vmcb;
1169 struct kvm_arch *vm_data = &svm->vcpu.kvm->arch;
1170 phys_addr_t bpa = page_to_phys(svm->avic_backing_page);
1171 phys_addr_t lpa = page_to_phys(vm_data->avic_logical_id_table_page);
1172 phys_addr_t ppa = page_to_phys(vm_data->avic_physical_id_table_page);
1173
1174 vmcb->control.avic_backing_page = bpa & AVIC_HPA_MASK;
1175 vmcb->control.avic_logical_id = lpa & AVIC_HPA_MASK;
1176 vmcb->control.avic_physical_id = ppa & AVIC_HPA_MASK;
1177 vmcb->control.avic_physical_id |= AVIC_MAX_PHYSICAL_ID_COUNT;
1178 vmcb->control.int_ctl |= AVIC_ENABLE_MASK;
1179 svm->vcpu.arch.apicv_active = true;
1180 }
1181
1182 static void init_vmcb(struct vcpu_svm *svm)
1183 {
1184 struct vmcb_control_area *control = &svm->vmcb->control;
1185 struct vmcb_save_area *save = &svm->vmcb->save;
1186
1187 svm->vcpu.arch.hflags = 0;
1188
1189 set_cr_intercept(svm, INTERCEPT_CR0_READ);
1190 set_cr_intercept(svm, INTERCEPT_CR3_READ);
1191 set_cr_intercept(svm, INTERCEPT_CR4_READ);
1192 set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
1193 set_cr_intercept(svm, INTERCEPT_CR3_WRITE);
1194 set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
1195 if (!kvm_vcpu_apicv_active(&svm->vcpu))
1196 set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
1197
1198 set_dr_intercepts(svm);
1199
1200 set_exception_intercept(svm, PF_VECTOR);
1201 set_exception_intercept(svm, UD_VECTOR);
1202 set_exception_intercept(svm, MC_VECTOR);
1203 set_exception_intercept(svm, AC_VECTOR);
1204 set_exception_intercept(svm, DB_VECTOR);
1205
1206 set_intercept(svm, INTERCEPT_INTR);
1207 set_intercept(svm, INTERCEPT_NMI);
1208 set_intercept(svm, INTERCEPT_SMI);
1209 set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
1210 set_intercept(svm, INTERCEPT_RDPMC);
1211 set_intercept(svm, INTERCEPT_CPUID);
1212 set_intercept(svm, INTERCEPT_INVD);
1213 set_intercept(svm, INTERCEPT_HLT);
1214 set_intercept(svm, INTERCEPT_INVLPG);
1215 set_intercept(svm, INTERCEPT_INVLPGA);
1216 set_intercept(svm, INTERCEPT_IOIO_PROT);
1217 set_intercept(svm, INTERCEPT_MSR_PROT);
1218 set_intercept(svm, INTERCEPT_TASK_SWITCH);
1219 set_intercept(svm, INTERCEPT_SHUTDOWN);
1220 set_intercept(svm, INTERCEPT_VMRUN);
1221 set_intercept(svm, INTERCEPT_VMMCALL);
1222 set_intercept(svm, INTERCEPT_VMLOAD);
1223 set_intercept(svm, INTERCEPT_VMSAVE);
1224 set_intercept(svm, INTERCEPT_STGI);
1225 set_intercept(svm, INTERCEPT_CLGI);
1226 set_intercept(svm, INTERCEPT_SKINIT);
1227 set_intercept(svm, INTERCEPT_WBINVD);
1228 set_intercept(svm, INTERCEPT_XSETBV);
1229
1230 if (!kvm_mwait_in_guest()) {
1231 set_intercept(svm, INTERCEPT_MONITOR);
1232 set_intercept(svm, INTERCEPT_MWAIT);
1233 }
1234
1235 control->iopm_base_pa = iopm_base;
1236 control->msrpm_base_pa = __pa(svm->msrpm);
1237 control->int_ctl = V_INTR_MASKING_MASK;
1238
1239 init_seg(&save->es);
1240 init_seg(&save->ss);
1241 init_seg(&save->ds);
1242 init_seg(&save->fs);
1243 init_seg(&save->gs);
1244
1245 save->cs.selector = 0xf000;
1246 save->cs.base = 0xffff0000;
1247 /* Executable/Readable Code Segment */
1248 save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
1249 SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
1250 save->cs.limit = 0xffff;
1251
1252 save->gdtr.limit = 0xffff;
1253 save->idtr.limit = 0xffff;
1254
1255 init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
1256 init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
1257
1258 svm_set_efer(&svm->vcpu, 0);
1259 save->dr6 = 0xffff0ff0;
1260 kvm_set_rflags(&svm->vcpu, 2);
1261 save->rip = 0x0000fff0;
1262 svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
1263
1264 /*
1265 * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
1266 * It also updates the guest-visible cr0 value.
1267 */
1268 svm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
1269 kvm_mmu_reset_context(&svm->vcpu);
1270
1271 save->cr4 = X86_CR4_PAE;
1272 /* rdx = ?? */
1273
1274 if (npt_enabled) {
1275 /* Setup VMCB for Nested Paging */
1276 control->nested_ctl = 1;
1277 clr_intercept(svm, INTERCEPT_INVLPG);
1278 clr_exception_intercept(svm, PF_VECTOR);
1279 clr_cr_intercept(svm, INTERCEPT_CR3_READ);
1280 clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
1281 save->g_pat = svm->vcpu.arch.pat;
1282 save->cr3 = 0;
1283 save->cr4 = 0;
1284 }
1285 svm->asid_generation = 0;
1286
1287 svm->nested.vmcb = 0;
1288 svm->vcpu.arch.hflags = 0;
1289
1290 if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
1291 control->pause_filter_count = 3000;
1292 set_intercept(svm, INTERCEPT_PAUSE);
1293 }
1294
1295 if (avic)
1296 avic_init_vmcb(svm);
1297
1298 /*
1299 * If hardware supports Virtual VMLOAD VMSAVE then enable it
1300 * in VMCB and clear intercepts to avoid #VMEXIT.
1301 */
1302 if (vls) {
1303 clr_intercept(svm, INTERCEPT_VMLOAD);
1304 clr_intercept(svm, INTERCEPT_VMSAVE);
1305 svm->vmcb->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK;
1306 }
1307
1308 mark_all_dirty(svm->vmcb);
1309
1310 enable_gif(svm);
1311
1312 }
1313
1314 static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
1315 unsigned int index)
1316 {
1317 u64 *avic_physical_id_table;
1318 struct kvm_arch *vm_data = &vcpu->kvm->arch;
1319
1320 if (index >= AVIC_MAX_PHYSICAL_ID_COUNT)
1321 return NULL;
1322
1323 avic_physical_id_table = page_address(vm_data->avic_physical_id_table_page);
1324
1325 return &avic_physical_id_table[index];
1326 }
1327
1328 /**
1329 * Note:
1330 * AVIC hardware walks the nested page table to check permissions,
1331 * but does not use the SPA address specified in the leaf page
1332 * table entry since it uses address in the AVIC_BACKING_PAGE pointer
1333 * field of the VMCB. Therefore, we set up the
1334 * APIC_ACCESS_PAGE_PRIVATE_MEMSLOT (4KB) here.
1335 */
1336 static int avic_init_access_page(struct kvm_vcpu *vcpu)
1337 {
1338 struct kvm *kvm = vcpu->kvm;
1339 int ret;
1340
1341 if (kvm->arch.apic_access_page_done)
1342 return 0;
1343
1344 ret = x86_set_memory_region(kvm,
1345 APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
1346 APIC_DEFAULT_PHYS_BASE,
1347 PAGE_SIZE);
1348 if (ret)
1349 return ret;
1350
1351 kvm->arch.apic_access_page_done = true;
1352 return 0;
1353 }
1354
1355 static int avic_init_backing_page(struct kvm_vcpu *vcpu)
1356 {
1357 int ret;
1358 u64 *entry, new_entry;
1359 int id = vcpu->vcpu_id;
1360 struct vcpu_svm *svm = to_svm(vcpu);
1361
1362 ret = avic_init_access_page(vcpu);
1363 if (ret)
1364 return ret;
1365
1366 if (id >= AVIC_MAX_PHYSICAL_ID_COUNT)
1367 return -EINVAL;
1368
1369 if (!svm->vcpu.arch.apic->regs)
1370 return -EINVAL;
1371
1372 svm->avic_backing_page = virt_to_page(svm->vcpu.arch.apic->regs);
1373
1374 /* Setting AVIC backing page address in the phy APIC ID table */
1375 entry = avic_get_physical_id_entry(vcpu, id);
1376 if (!entry)
1377 return -EINVAL;
1378
1379 new_entry = READ_ONCE(*entry);
1380 new_entry = (page_to_phys(svm->avic_backing_page) &
1381 AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK) |
1382 AVIC_PHYSICAL_ID_ENTRY_VALID_MASK;
1383 WRITE_ONCE(*entry, new_entry);
1384
1385 svm->avic_physical_id_cache = entry;
1386
1387 return 0;
1388 }
1389
1390 static inline int avic_get_next_vm_id(void)
1391 {
1392 int id;
1393
1394 spin_lock(&avic_vm_id_lock);
1395
1396 /* AVIC VM ID is one-based. */
1397 id = find_next_zero_bit(avic_vm_id_bitmap, AVIC_VM_ID_NR, 1);
1398 if (id <= AVIC_VM_ID_MASK)
1399 __set_bit(id, avic_vm_id_bitmap);
1400 else
1401 id = -EAGAIN;
1402
1403 spin_unlock(&avic_vm_id_lock);
1404 return id;
1405 }
1406
1407 static inline int avic_free_vm_id(int id)
1408 {
1409 if (id <= 0 || id > AVIC_VM_ID_MASK)
1410 return -EINVAL;
1411
1412 spin_lock(&avic_vm_id_lock);
1413 __clear_bit(id, avic_vm_id_bitmap);
1414 spin_unlock(&avic_vm_id_lock);
1415 return 0;
1416 }
1417
1418 static void avic_vm_destroy(struct kvm *kvm)
1419 {
1420 unsigned long flags;
1421 struct kvm_arch *vm_data = &kvm->arch;
1422
1423 if (!avic)
1424 return;
1425
1426 avic_free_vm_id(vm_data->avic_vm_id);
1427
1428 if (vm_data->avic_logical_id_table_page)
1429 __free_page(vm_data->avic_logical_id_table_page);
1430 if (vm_data->avic_physical_id_table_page)
1431 __free_page(vm_data->avic_physical_id_table_page);
1432
1433 spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1434 hash_del(&vm_data->hnode);
1435 spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
1436 }
1437
1438 static int avic_vm_init(struct kvm *kvm)
1439 {
1440 unsigned long flags;
1441 int vm_id, err = -ENOMEM;
1442 struct kvm_arch *vm_data = &kvm->arch;
1443 struct page *p_page;
1444 struct page *l_page;
1445
1446 if (!avic)
1447 return 0;
1448
1449 vm_id = avic_get_next_vm_id();
1450 if (vm_id < 0)
1451 return vm_id;
1452 vm_data->avic_vm_id = (u32)vm_id;
1453
1454 /* Allocating physical APIC ID table (4KB) */
1455 p_page = alloc_page(GFP_KERNEL);
1456 if (!p_page)
1457 goto free_avic;
1458
1459 vm_data->avic_physical_id_table_page = p_page;
1460 clear_page(page_address(p_page));
1461
1462 /* Allocating logical APIC ID table (4KB) */
1463 l_page = alloc_page(GFP_KERNEL);
1464 if (!l_page)
1465 goto free_avic;
1466
1467 vm_data->avic_logical_id_table_page = l_page;
1468 clear_page(page_address(l_page));
1469
1470 spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1471 hash_add(svm_vm_data_hash, &vm_data->hnode, vm_data->avic_vm_id);
1472 spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
1473
1474 return 0;
1475
1476 free_avic:
1477 avic_vm_destroy(kvm);
1478 return err;
1479 }
1480
1481 static inline int
1482 avic_update_iommu_vcpu_affinity(struct kvm_vcpu *vcpu, int cpu, bool r)
1483 {
1484 int ret = 0;
1485 unsigned long flags;
1486 struct amd_svm_iommu_ir *ir;
1487 struct vcpu_svm *svm = to_svm(vcpu);
1488
1489 if (!kvm_arch_has_assigned_device(vcpu->kvm))
1490 return 0;
1491
1492 /*
1493 * Here, we go through the per-vcpu ir_list to update all existing
1494 * interrupt remapping table entry targeting this vcpu.
1495 */
1496 spin_lock_irqsave(&svm->ir_list_lock, flags);
1497
1498 if (list_empty(&svm->ir_list))
1499 goto out;
1500
1501 list_for_each_entry(ir, &svm->ir_list, node) {
1502 ret = amd_iommu_update_ga(cpu, r, ir->data);
1503 if (ret)
1504 break;
1505 }
1506 out:
1507 spin_unlock_irqrestore(&svm->ir_list_lock, flags);
1508 return ret;
1509 }
1510
1511 static void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1512 {
1513 u64 entry;
1514 /* ID = 0xff (broadcast), ID > 0xff (reserved) */
1515 int h_physical_id = kvm_cpu_get_apicid(cpu);
1516 struct vcpu_svm *svm = to_svm(vcpu);
1517
1518 if (!kvm_vcpu_apicv_active(vcpu))
1519 return;
1520
1521 if (WARN_ON(h_physical_id >= AVIC_MAX_PHYSICAL_ID_COUNT))
1522 return;
1523
1524 entry = READ_ONCE(*(svm->avic_physical_id_cache));
1525 WARN_ON(entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK);
1526
1527 entry &= ~AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK;
1528 entry |= (h_physical_id & AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK);
1529
1530 entry &= ~AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
1531 if (svm->avic_is_running)
1532 entry |= AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
1533
1534 WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
1535 avic_update_iommu_vcpu_affinity(vcpu, h_physical_id,
1536 svm->avic_is_running);
1537 }
1538
1539 static void avic_vcpu_put(struct kvm_vcpu *vcpu)
1540 {
1541 u64 entry;
1542 struct vcpu_svm *svm = to_svm(vcpu);
1543
1544 if (!kvm_vcpu_apicv_active(vcpu))
1545 return;
1546
1547 entry = READ_ONCE(*(svm->avic_physical_id_cache));
1548 if (entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK)
1549 avic_update_iommu_vcpu_affinity(vcpu, -1, 0);
1550
1551 entry &= ~AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
1552 WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
1553 }
1554
1555 /**
1556 * This function is called during VCPU halt/unhalt.
1557 */
1558 static void avic_set_running(struct kvm_vcpu *vcpu, bool is_run)
1559 {
1560 struct vcpu_svm *svm = to_svm(vcpu);
1561
1562 svm->avic_is_running = is_run;
1563 if (is_run)
1564 avic_vcpu_load(vcpu, vcpu->cpu);
1565 else
1566 avic_vcpu_put(vcpu);
1567 }
1568
1569 static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
1570 {
1571 struct vcpu_svm *svm = to_svm(vcpu);
1572 u32 dummy;
1573 u32 eax = 1;
1574
1575 if (!init_event) {
1576 svm->vcpu.arch.apic_base = APIC_DEFAULT_PHYS_BASE |
1577 MSR_IA32_APICBASE_ENABLE;
1578 if (kvm_vcpu_is_reset_bsp(&svm->vcpu))
1579 svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
1580 }
1581 init_vmcb(svm);
1582
1583 kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy);
1584 kvm_register_write(vcpu, VCPU_REGS_RDX, eax);
1585
1586 if (kvm_vcpu_apicv_active(vcpu) && !init_event)
1587 avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
1588 }
1589
1590 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
1591 {
1592 struct vcpu_svm *svm;
1593 struct page *page;
1594 struct page *msrpm_pages;
1595 struct page *hsave_page;
1596 struct page *nested_msrpm_pages;
1597 int err;
1598
1599 svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1600 if (!svm) {
1601 err = -ENOMEM;
1602 goto out;
1603 }
1604
1605 err = kvm_vcpu_init(&svm->vcpu, kvm, id);
1606 if (err)
1607 goto free_svm;
1608
1609 err = -ENOMEM;
1610 page = alloc_page(GFP_KERNEL);
1611 if (!page)
1612 goto uninit;
1613
1614 msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
1615 if (!msrpm_pages)
1616 goto free_page1;
1617
1618 nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
1619 if (!nested_msrpm_pages)
1620 goto free_page2;
1621
1622 hsave_page = alloc_page(GFP_KERNEL);
1623 if (!hsave_page)
1624 goto free_page3;
1625
1626 if (avic) {
1627 err = avic_init_backing_page(&svm->vcpu);
1628 if (err)
1629 goto free_page4;
1630
1631 INIT_LIST_HEAD(&svm->ir_list);
1632 spin_lock_init(&svm->ir_list_lock);
1633 }
1634
1635 /* We initialize this flag to true to make sure that the is_running
1636 * bit would be set the first time the vcpu is loaded.
1637 */
1638 svm->avic_is_running = true;
1639
1640 svm->nested.hsave = page_address(hsave_page);
1641
1642 svm->msrpm = page_address(msrpm_pages);
1643 svm_vcpu_init_msrpm(svm->msrpm);
1644
1645 svm->nested.msrpm = page_address(nested_msrpm_pages);
1646 svm_vcpu_init_msrpm(svm->nested.msrpm);
1647
1648 svm->vmcb = page_address(page);
1649 clear_page(svm->vmcb);
1650 svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
1651 svm->asid_generation = 0;
1652 init_vmcb(svm);
1653
1654 svm_init_osvw(&svm->vcpu);
1655
1656 return &svm->vcpu;
1657
1658 free_page4:
1659 __free_page(hsave_page);
1660 free_page3:
1661 __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
1662 free_page2:
1663 __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
1664 free_page1:
1665 __free_page(page);
1666 uninit:
1667 kvm_vcpu_uninit(&svm->vcpu);
1668 free_svm:
1669 kmem_cache_free(kvm_vcpu_cache, svm);
1670 out:
1671 return ERR_PTR(err);
1672 }
1673
1674 static void svm_free_vcpu(struct kvm_vcpu *vcpu)
1675 {
1676 struct vcpu_svm *svm = to_svm(vcpu);
1677
1678 __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
1679 __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
1680 __free_page(virt_to_page(svm->nested.hsave));
1681 __free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
1682 kvm_vcpu_uninit(vcpu);
1683 kmem_cache_free(kvm_vcpu_cache, svm);
1684 }
1685
1686 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1687 {
1688 struct vcpu_svm *svm = to_svm(vcpu);
1689 int i;
1690
1691 if (unlikely(cpu != vcpu->cpu)) {
1692 svm->asid_generation = 0;
1693 mark_all_dirty(svm->vmcb);
1694 }
1695
1696 #ifdef CONFIG_X86_64
1697 rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
1698 #endif
1699 savesegment(fs, svm->host.fs);
1700 savesegment(gs, svm->host.gs);
1701 svm->host.ldt = kvm_read_ldt();
1702
1703 for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
1704 rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
1705
1706 if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
1707 u64 tsc_ratio = vcpu->arch.tsc_scaling_ratio;
1708 if (tsc_ratio != __this_cpu_read(current_tsc_ratio)) {
1709 __this_cpu_write(current_tsc_ratio, tsc_ratio);
1710 wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
1711 }
1712 }
1713 /* This assumes that the kernel never uses MSR_TSC_AUX */
1714 if (static_cpu_has(X86_FEATURE_RDTSCP))
1715 wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
1716
1717 avic_vcpu_load(vcpu, cpu);
1718 }
1719
1720 static void svm_vcpu_put(struct kvm_vcpu *vcpu)
1721 {
1722 struct vcpu_svm *svm = to_svm(vcpu);
1723 int i;
1724
1725 avic_vcpu_put(vcpu);
1726
1727 ++vcpu->stat.host_state_reload;
1728 kvm_load_ldt(svm->host.ldt);
1729 #ifdef CONFIG_X86_64
1730 loadsegment(fs, svm->host.fs);
1731 wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gsbase);
1732 load_gs_index(svm->host.gs);
1733 #else
1734 #ifdef CONFIG_X86_32_LAZY_GS
1735 loadsegment(gs, svm->host.gs);
1736 #endif
1737 #endif
1738 for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
1739 wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
1740 }
1741
1742 static void svm_vcpu_blocking(struct kvm_vcpu *vcpu)
1743 {
1744 avic_set_running(vcpu, false);
1745 }
1746
1747 static void svm_vcpu_unblocking(struct kvm_vcpu *vcpu)
1748 {
1749 avic_set_running(vcpu, true);
1750 }
1751
1752 static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
1753 {
1754 struct vcpu_svm *svm = to_svm(vcpu);
1755 unsigned long rflags = svm->vmcb->save.rflags;
1756
1757 if (svm->nmi_singlestep) {
1758 /* Hide our flags if they were not set by the guest */
1759 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
1760 rflags &= ~X86_EFLAGS_TF;
1761 if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
1762 rflags &= ~X86_EFLAGS_RF;
1763 }
1764 return rflags;
1765 }
1766
1767 static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
1768 {
1769 if (to_svm(vcpu)->nmi_singlestep)
1770 rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
1771
1772 /*
1773 * Any change of EFLAGS.VM is accompanied by a reload of SS
1774 * (caused by either a task switch or an inter-privilege IRET),
1775 * so we do not need to update the CPL here.
1776 */
1777 to_svm(vcpu)->vmcb->save.rflags = rflags;
1778 }
1779
1780 static u32 svm_get_pkru(struct kvm_vcpu *vcpu)
1781 {
1782 return 0;
1783 }
1784
1785 static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
1786 {
1787 switch (reg) {
1788 case VCPU_EXREG_PDPTR:
1789 BUG_ON(!npt_enabled);
1790 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
1791 break;
1792 default:
1793 BUG();
1794 }
1795 }
1796
1797 static void svm_set_vintr(struct vcpu_svm *svm)
1798 {
1799 set_intercept(svm, INTERCEPT_VINTR);
1800 }
1801
1802 static void svm_clear_vintr(struct vcpu_svm *svm)
1803 {
1804 clr_intercept(svm, INTERCEPT_VINTR);
1805 }
1806
1807 static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
1808 {
1809 struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1810
1811 switch (seg) {
1812 case VCPU_SREG_CS: return &save->cs;
1813 case VCPU_SREG_DS: return &save->ds;
1814 case VCPU_SREG_ES: return &save->es;
1815 case VCPU_SREG_FS: return &save->fs;
1816 case VCPU_SREG_GS: return &save->gs;
1817 case VCPU_SREG_SS: return &save->ss;
1818 case VCPU_SREG_TR: return &save->tr;
1819 case VCPU_SREG_LDTR: return &save->ldtr;
1820 }
1821 BUG();
1822 return NULL;
1823 }
1824
1825 static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
1826 {
1827 struct vmcb_seg *s = svm_seg(vcpu, seg);
1828
1829 return s->base;
1830 }
1831
1832 static void svm_get_segment(struct kvm_vcpu *vcpu,
1833 struct kvm_segment *var, int seg)
1834 {
1835 struct vmcb_seg *s = svm_seg(vcpu, seg);
1836
1837 var->base = s->base;
1838 var->limit = s->limit;
1839 var->selector = s->selector;
1840 var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
1841 var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
1842 var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
1843 var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
1844 var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
1845 var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
1846 var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
1847
1848 /*
1849 * AMD CPUs circa 2014 track the G bit for all segments except CS.
1850 * However, the SVM spec states that the G bit is not observed by the
1851 * CPU, and some VMware virtual CPUs drop the G bit for all segments.
1852 * So let's synthesize a legal G bit for all segments, this helps
1853 * running KVM nested. It also helps cross-vendor migration, because
1854 * Intel's vmentry has a check on the 'G' bit.
1855 */
1856 var->g = s->limit > 0xfffff;
1857
1858 /*
1859 * AMD's VMCB does not have an explicit unusable field, so emulate it
1860 * for cross vendor migration purposes by "not present"
1861 */
1862 var->unusable = !var->present;
1863
1864 switch (seg) {
1865 case VCPU_SREG_TR:
1866 /*
1867 * Work around a bug where the busy flag in the tr selector
1868 * isn't exposed
1869 */
1870 var->type |= 0x2;
1871 break;
1872 case VCPU_SREG_DS:
1873 case VCPU_SREG_ES:
1874 case VCPU_SREG_FS:
1875 case VCPU_SREG_GS:
1876 /*
1877 * The accessed bit must always be set in the segment
1878 * descriptor cache, although it can be cleared in the
1879 * descriptor, the cached bit always remains at 1. Since
1880 * Intel has a check on this, set it here to support
1881 * cross-vendor migration.
1882 */
1883 if (!var->unusable)
1884 var->type |= 0x1;
1885 break;
1886 case VCPU_SREG_SS:
1887 /*
1888 * On AMD CPUs sometimes the DB bit in the segment
1889 * descriptor is left as 1, although the whole segment has
1890 * been made unusable. Clear it here to pass an Intel VMX
1891 * entry check when cross vendor migrating.
1892 */
1893 if (var->unusable)
1894 var->db = 0;
1895 /* This is symmetric with svm_set_segment() */
1896 var->dpl = to_svm(vcpu)->vmcb->save.cpl;
1897 break;
1898 }
1899 }
1900
1901 static int svm_get_cpl(struct kvm_vcpu *vcpu)
1902 {
1903 struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
1904
1905 return save->cpl;
1906 }
1907
1908 static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1909 {
1910 struct vcpu_svm *svm = to_svm(vcpu);
1911
1912 dt->size = svm->vmcb->save.idtr.limit;
1913 dt->address = svm->vmcb->save.idtr.base;
1914 }
1915
1916 static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1917 {
1918 struct vcpu_svm *svm = to_svm(vcpu);
1919
1920 svm->vmcb->save.idtr.limit = dt->size;
1921 svm->vmcb->save.idtr.base = dt->address ;
1922 mark_dirty(svm->vmcb, VMCB_DT);
1923 }
1924
1925 static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1926 {
1927 struct vcpu_svm *svm = to_svm(vcpu);
1928
1929 dt->size = svm->vmcb->save.gdtr.limit;
1930 dt->address = svm->vmcb->save.gdtr.base;
1931 }
1932
1933 static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
1934 {
1935 struct vcpu_svm *svm = to_svm(vcpu);
1936
1937 svm->vmcb->save.gdtr.limit = dt->size;
1938 svm->vmcb->save.gdtr.base = dt->address ;
1939 mark_dirty(svm->vmcb, VMCB_DT);
1940 }
1941
1942 static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
1943 {
1944 }
1945
1946 static void svm_decache_cr3(struct kvm_vcpu *vcpu)
1947 {
1948 }
1949
1950 static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1951 {
1952 }
1953
1954 static void update_cr0_intercept(struct vcpu_svm *svm)
1955 {
1956 ulong gcr0 = svm->vcpu.arch.cr0;
1957 u64 *hcr0 = &svm->vmcb->save.cr0;
1958
1959 *hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
1960 | (gcr0 & SVM_CR0_SELECTIVE_MASK);
1961
1962 mark_dirty(svm->vmcb, VMCB_CR);
1963
1964 if (gcr0 == *hcr0) {
1965 clr_cr_intercept(svm, INTERCEPT_CR0_READ);
1966 clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
1967 } else {
1968 set_cr_intercept(svm, INTERCEPT_CR0_READ);
1969 set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
1970 }
1971 }
1972
1973 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
1974 {
1975 struct vcpu_svm *svm = to_svm(vcpu);
1976
1977 #ifdef CONFIG_X86_64
1978 if (vcpu->arch.efer & EFER_LME) {
1979 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
1980 vcpu->arch.efer |= EFER_LMA;
1981 svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
1982 }
1983
1984 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
1985 vcpu->arch.efer &= ~EFER_LMA;
1986 svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
1987 }
1988 }
1989 #endif
1990 vcpu->arch.cr0 = cr0;
1991
1992 if (!npt_enabled)
1993 cr0 |= X86_CR0_PG | X86_CR0_WP;
1994
1995 /*
1996 * re-enable caching here because the QEMU bios
1997 * does not do it - this results in some delay at
1998 * reboot
1999 */
2000 if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
2001 cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
2002 svm->vmcb->save.cr0 = cr0;
2003 mark_dirty(svm->vmcb, VMCB_CR);
2004 update_cr0_intercept(svm);
2005 }
2006
2007 static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
2008 {
2009 unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
2010 unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
2011
2012 if (cr4 & X86_CR4_VMXE)
2013 return 1;
2014
2015 if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
2016 svm_flush_tlb(vcpu);
2017
2018 vcpu->arch.cr4 = cr4;
2019 if (!npt_enabled)
2020 cr4 |= X86_CR4_PAE;
2021 cr4 |= host_cr4_mce;
2022 to_svm(vcpu)->vmcb->save.cr4 = cr4;
2023 mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
2024 return 0;
2025 }
2026
2027 static void svm_set_segment(struct kvm_vcpu *vcpu,
2028 struct kvm_segment *var, int seg)
2029 {
2030 struct vcpu_svm *svm = to_svm(vcpu);
2031 struct vmcb_seg *s = svm_seg(vcpu, seg);
2032
2033 s->base = var->base;
2034 s->limit = var->limit;
2035 s->selector = var->selector;
2036 s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
2037 s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
2038 s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
2039 s->attrib |= ((var->present & 1) && !var->unusable) << SVM_SELECTOR_P_SHIFT;
2040 s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
2041 s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
2042 s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
2043 s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
2044
2045 /*
2046 * This is always accurate, except if SYSRET returned to a segment
2047 * with SS.DPL != 3. Intel does not have this quirk, and always
2048 * forces SS.DPL to 3 on sysret, so we ignore that case; fixing it
2049 * would entail passing the CPL to userspace and back.
2050 */
2051 if (seg == VCPU_SREG_SS)
2052 /* This is symmetric with svm_get_segment() */
2053 svm->vmcb->save.cpl = (var->dpl & 3);
2054
2055 mark_dirty(svm->vmcb, VMCB_SEG);
2056 }
2057
2058 static void update_bp_intercept(struct kvm_vcpu *vcpu)
2059 {
2060 struct vcpu_svm *svm = to_svm(vcpu);
2061
2062 clr_exception_intercept(svm, BP_VECTOR);
2063
2064 if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
2065 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2066 set_exception_intercept(svm, BP_VECTOR);
2067 } else
2068 vcpu->guest_debug = 0;
2069 }
2070
2071 static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
2072 {
2073 if (sd->next_asid > sd->max_asid) {
2074 ++sd->asid_generation;
2075 sd->next_asid = 1;
2076 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
2077 }
2078
2079 svm->asid_generation = sd->asid_generation;
2080 svm->vmcb->control.asid = sd->next_asid++;
2081
2082 mark_dirty(svm->vmcb, VMCB_ASID);
2083 }
2084
2085 static u64 svm_get_dr6(struct kvm_vcpu *vcpu)
2086 {
2087 return to_svm(vcpu)->vmcb->save.dr6;
2088 }
2089
2090 static void svm_set_dr6(struct kvm_vcpu *vcpu, unsigned long value)
2091 {
2092 struct vcpu_svm *svm = to_svm(vcpu);
2093
2094 svm->vmcb->save.dr6 = value;
2095 mark_dirty(svm->vmcb, VMCB_DR);
2096 }
2097
2098 static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
2099 {
2100 struct vcpu_svm *svm = to_svm(vcpu);
2101
2102 get_debugreg(vcpu->arch.db[0], 0);
2103 get_debugreg(vcpu->arch.db[1], 1);
2104 get_debugreg(vcpu->arch.db[2], 2);
2105 get_debugreg(vcpu->arch.db[3], 3);
2106 vcpu->arch.dr6 = svm_get_dr6(vcpu);
2107 vcpu->arch.dr7 = svm->vmcb->save.dr7;
2108
2109 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
2110 set_dr_intercepts(svm);
2111 }
2112
2113 static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
2114 {
2115 struct vcpu_svm *svm = to_svm(vcpu);
2116
2117 svm->vmcb->save.dr7 = value;
2118 mark_dirty(svm->vmcb, VMCB_DR);
2119 }
2120
2121 static int pf_interception(struct vcpu_svm *svm)
2122 {
2123 u64 fault_address = svm->vmcb->control.exit_info_2;
2124 u64 error_code = svm->vmcb->control.exit_info_1;
2125
2126 return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
2127 svm->vmcb->control.insn_bytes,
2128 svm->vmcb->control.insn_len, !npt_enabled);
2129 }
2130
2131 static int db_interception(struct vcpu_svm *svm)
2132 {
2133 struct kvm_run *kvm_run = svm->vcpu.run;
2134
2135 if (!(svm->vcpu.guest_debug &
2136 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
2137 !svm->nmi_singlestep) {
2138 kvm_queue_exception(&svm->vcpu, DB_VECTOR);
2139 return 1;
2140 }
2141
2142 if (svm->nmi_singlestep) {
2143 disable_nmi_singlestep(svm);
2144 }
2145
2146 if (svm->vcpu.guest_debug &
2147 (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
2148 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2149 kvm_run->debug.arch.pc =
2150 svm->vmcb->save.cs.base + svm->vmcb->save.rip;
2151 kvm_run->debug.arch.exception = DB_VECTOR;
2152 return 0;
2153 }
2154
2155 return 1;
2156 }
2157
2158 static int bp_interception(struct vcpu_svm *svm)
2159 {
2160 struct kvm_run *kvm_run = svm->vcpu.run;
2161
2162 kvm_run->exit_reason = KVM_EXIT_DEBUG;
2163 kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
2164 kvm_run->debug.arch.exception = BP_VECTOR;
2165 return 0;
2166 }
2167
2168 static int ud_interception(struct vcpu_svm *svm)
2169 {
2170 int er;
2171
2172 er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
2173 if (er != EMULATE_DONE)
2174 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2175 return 1;
2176 }
2177
2178 static int ac_interception(struct vcpu_svm *svm)
2179 {
2180 kvm_queue_exception_e(&svm->vcpu, AC_VECTOR, 0);
2181 return 1;
2182 }
2183
2184 static bool is_erratum_383(void)
2185 {
2186 int err, i;
2187 u64 value;
2188
2189 if (!erratum_383_found)
2190 return false;
2191
2192 value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
2193 if (err)
2194 return false;
2195
2196 /* Bit 62 may or may not be set for this mce */
2197 value &= ~(1ULL << 62);
2198
2199 if (value != 0xb600000000010015ULL)
2200 return false;
2201
2202 /* Clear MCi_STATUS registers */
2203 for (i = 0; i < 6; ++i)
2204 native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);
2205
2206 value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
2207 if (!err) {
2208 u32 low, high;
2209
2210 value &= ~(1ULL << 2);
2211 low = lower_32_bits(value);
2212 high = upper_32_bits(value);
2213
2214 native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
2215 }
2216
2217 /* Flush tlb to evict multi-match entries */
2218 __flush_tlb_all();
2219
2220 return true;
2221 }
2222
2223 static void svm_handle_mce(struct vcpu_svm *svm)
2224 {
2225 if (is_erratum_383()) {
2226 /*
2227 * Erratum 383 triggered. Guest state is corrupt so kill the
2228 * guest.
2229 */
2230 pr_err("KVM: Guest triggered AMD Erratum 383\n");
2231
2232 kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
2233
2234 return;
2235 }
2236
2237 /*
2238 * On an #MC intercept the MCE handler is not called automatically in
2239 * the host. So do it by hand here.
2240 */
2241 asm volatile (
2242 "int $0x12\n");
2243 /* not sure if we ever come back to this point */
2244
2245 return;
2246 }
2247
2248 static int mc_interception(struct vcpu_svm *svm)
2249 {
2250 return 1;
2251 }
2252
2253 static int shutdown_interception(struct vcpu_svm *svm)
2254 {
2255 struct kvm_run *kvm_run = svm->vcpu.run;
2256
2257 /*
2258 * VMCB is undefined after a SHUTDOWN intercept
2259 * so reinitialize it.
2260 */
2261 clear_page(svm->vmcb);
2262 init_vmcb(svm);
2263
2264 kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
2265 return 0;
2266 }
2267
2268 static int io_interception(struct vcpu_svm *svm)
2269 {
2270 struct kvm_vcpu *vcpu = &svm->vcpu;
2271 u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
2272 int size, in, string, ret;
2273 unsigned port;
2274
2275 ++svm->vcpu.stat.io_exits;
2276 string = (io_info & SVM_IOIO_STR_MASK) != 0;
2277 in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
2278 if (string)
2279 return emulate_instruction(vcpu, 0) == EMULATE_DONE;
2280
2281 port = io_info >> 16;
2282 size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
2283 svm->next_rip = svm->vmcb->control.exit_info_2;
2284 ret = kvm_skip_emulated_instruction(&svm->vcpu);
2285
2286 /*
2287 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered
2288 * KVM_EXIT_DEBUG here.
2289 */
2290 if (in)
2291 return kvm_fast_pio_in(vcpu, size, port) && ret;
2292 else
2293 return kvm_fast_pio_out(vcpu, size, port) && ret;
2294 }
2295
2296 static int nmi_interception(struct vcpu_svm *svm)
2297 {
2298 return 1;
2299 }
2300
2301 static int intr_interception(struct vcpu_svm *svm)
2302 {
2303 ++svm->vcpu.stat.irq_exits;
2304 return 1;
2305 }
2306
2307 static int nop_on_interception(struct vcpu_svm *svm)
2308 {
2309 return 1;
2310 }
2311
2312 static int halt_interception(struct vcpu_svm *svm)
2313 {
2314 svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
2315 return kvm_emulate_halt(&svm->vcpu);
2316 }
2317
2318 static int vmmcall_interception(struct vcpu_svm *svm)
2319 {
2320 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2321 return kvm_emulate_hypercall(&svm->vcpu);
2322 }
2323
2324 static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
2325 {
2326 struct vcpu_svm *svm = to_svm(vcpu);
2327
2328 return svm->nested.nested_cr3;
2329 }
2330
2331 static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
2332 {
2333 struct vcpu_svm *svm = to_svm(vcpu);
2334 u64 cr3 = svm->nested.nested_cr3;
2335 u64 pdpte;
2336 int ret;
2337
2338 ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(cr3), &pdpte,
2339 offset_in_page(cr3) + index * 8, 8);
2340 if (ret)
2341 return 0;
2342 return pdpte;
2343 }
2344
2345 static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
2346 unsigned long root)
2347 {
2348 struct vcpu_svm *svm = to_svm(vcpu);
2349
2350 svm->vmcb->control.nested_cr3 = root;
2351 mark_dirty(svm->vmcb, VMCB_NPT);
2352 svm_flush_tlb(vcpu);
2353 }
2354
2355 static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
2356 struct x86_exception *fault)
2357 {
2358 struct vcpu_svm *svm = to_svm(vcpu);
2359
2360 if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
2361 /*
2362 * TODO: track the cause of the nested page fault, and
2363 * correctly fill in the high bits of exit_info_1.
2364 */
2365 svm->vmcb->control.exit_code = SVM_EXIT_NPF;
2366 svm->vmcb->control.exit_code_hi = 0;
2367 svm->vmcb->control.exit_info_1 = (1ULL << 32);
2368 svm->vmcb->control.exit_info_2 = fault->address;
2369 }
2370
2371 svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
2372 svm->vmcb->control.exit_info_1 |= fault->error_code;
2373
2374 /*
2375 * The present bit is always zero for page structure faults on real
2376 * hardware.
2377 */
2378 if (svm->vmcb->control.exit_info_1 & (2ULL << 32))
2379 svm->vmcb->control.exit_info_1 &= ~1;
2380
2381 nested_svm_vmexit(svm);
2382 }
2383
2384 static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
2385 {
2386 WARN_ON(mmu_is_nested(vcpu));
2387 kvm_init_shadow_mmu(vcpu);
2388 vcpu->arch.mmu.set_cr3 = nested_svm_set_tdp_cr3;
2389 vcpu->arch.mmu.get_cr3 = nested_svm_get_tdp_cr3;
2390 vcpu->arch.mmu.get_pdptr = nested_svm_get_tdp_pdptr;
2391 vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
2392 vcpu->arch.mmu.shadow_root_level = get_npt_level();
2393 reset_shadow_zero_bits_mask(vcpu, &vcpu->arch.mmu);
2394 vcpu->arch.walk_mmu = &vcpu->arch.nested_mmu;
2395 }
2396
2397 static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
2398 {
2399 vcpu->arch.walk_mmu = &vcpu->arch.mmu;
2400 }
2401
2402 static int nested_svm_check_permissions(struct vcpu_svm *svm)
2403 {
2404 if (!(svm->vcpu.arch.efer & EFER_SVME) ||
2405 !is_paging(&svm->vcpu)) {
2406 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2407 return 1;
2408 }
2409
2410 if (svm->vmcb->save.cpl) {
2411 kvm_inject_gp(&svm->vcpu, 0);
2412 return 1;
2413 }
2414
2415 return 0;
2416 }
2417
2418 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
2419 bool has_error_code, u32 error_code)
2420 {
2421 int vmexit;
2422
2423 if (!is_guest_mode(&svm->vcpu))
2424 return 0;
2425
2426 vmexit = nested_svm_intercept(svm);
2427 if (vmexit != NESTED_EXIT_DONE)
2428 return 0;
2429
2430 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
2431 svm->vmcb->control.exit_code_hi = 0;
2432 svm->vmcb->control.exit_info_1 = error_code;
2433 if (svm->vcpu.arch.exception.nested_apf)
2434 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
2435 else
2436 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
2437
2438 svm->nested.exit_required = true;
2439 return vmexit;
2440 }
2441
2442 /* This function returns true if it is save to enable the irq window */
2443 static inline bool nested_svm_intr(struct vcpu_svm *svm)
2444 {
2445 if (!is_guest_mode(&svm->vcpu))
2446 return true;
2447
2448 if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
2449 return true;
2450
2451 if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
2452 return false;
2453
2454 /*
2455 * if vmexit was already requested (by intercepted exception
2456 * for instance) do not overwrite it with "external interrupt"
2457 * vmexit.
2458 */
2459 if (svm->nested.exit_required)
2460 return false;
2461
2462 svm->vmcb->control.exit_code = SVM_EXIT_INTR;
2463 svm->vmcb->control.exit_info_1 = 0;
2464 svm->vmcb->control.exit_info_2 = 0;
2465
2466 if (svm->nested.intercept & 1ULL) {
2467 /*
2468 * The #vmexit can't be emulated here directly because this
2469 * code path runs with irqs and preemption disabled. A
2470 * #vmexit emulation might sleep. Only signal request for
2471 * the #vmexit here.
2472 */
2473 svm->nested.exit_required = true;
2474 trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
2475 return false;
2476 }
2477
2478 return true;
2479 }
2480
2481 /* This function returns true if it is save to enable the nmi window */
2482 static inline bool nested_svm_nmi(struct vcpu_svm *svm)
2483 {
2484 if (!is_guest_mode(&svm->vcpu))
2485 return true;
2486
2487 if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI)))
2488 return true;
2489
2490 svm->vmcb->control.exit_code = SVM_EXIT_NMI;
2491 svm->nested.exit_required = true;
2492
2493 return false;
2494 }
2495
2496 static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
2497 {
2498 struct page *page;
2499
2500 might_sleep();
2501
2502 page = kvm_vcpu_gfn_to_page(&svm->vcpu, gpa >> PAGE_SHIFT);
2503 if (is_error_page(page))
2504 goto error;
2505
2506 *_page = page;
2507
2508 return kmap(page);
2509
2510 error:
2511 kvm_inject_gp(&svm->vcpu, 0);
2512
2513 return NULL;
2514 }
2515
2516 static void nested_svm_unmap(struct page *page)
2517 {
2518 kunmap(page);
2519 kvm_release_page_dirty(page);
2520 }
2521
2522 static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
2523 {
2524 unsigned port, size, iopm_len;
2525 u16 val, mask;
2526 u8 start_bit;
2527 u64 gpa;
2528
2529 if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
2530 return NESTED_EXIT_HOST;
2531
2532 port = svm->vmcb->control.exit_info_1 >> 16;
2533 size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
2534 SVM_IOIO_SIZE_SHIFT;
2535 gpa = svm->nested.vmcb_iopm + (port / 8);
2536 start_bit = port % 8;
2537 iopm_len = (start_bit + size > 8) ? 2 : 1;
2538 mask = (0xf >> (4 - size)) << start_bit;
2539 val = 0;
2540
2541 if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
2542 return NESTED_EXIT_DONE;
2543
2544 return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
2545 }
2546
2547 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
2548 {
2549 u32 offset, msr, value;
2550 int write, mask;
2551
2552 if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
2553 return NESTED_EXIT_HOST;
2554
2555 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
2556 offset = svm_msrpm_offset(msr);
2557 write = svm->vmcb->control.exit_info_1 & 1;
2558 mask = 1 << ((2 * (msr & 0xf)) + write);
2559
2560 if (offset == MSR_INVALID)
2561 return NESTED_EXIT_DONE;
2562
2563 /* Offset is in 32 bit units but need in 8 bit units */
2564 offset *= 4;
2565
2566 if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.vmcb_msrpm + offset, &value, 4))
2567 return NESTED_EXIT_DONE;
2568
2569 return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
2570 }
2571
2572 /* DB exceptions for our internal use must not cause vmexit */
2573 static int nested_svm_intercept_db(struct vcpu_svm *svm)
2574 {
2575 unsigned long dr6;
2576
2577 /* if we're not singlestepping, it's not ours */
2578 if (!svm->nmi_singlestep)
2579 return NESTED_EXIT_DONE;
2580
2581 /* if it's not a singlestep exception, it's not ours */
2582 if (kvm_get_dr(&svm->vcpu, 6, &dr6))
2583 return NESTED_EXIT_DONE;
2584 if (!(dr6 & DR6_BS))
2585 return NESTED_EXIT_DONE;
2586
2587 /* if the guest is singlestepping, it should get the vmexit */
2588 if (svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF) {
2589 disable_nmi_singlestep(svm);
2590 return NESTED_EXIT_DONE;
2591 }
2592
2593 /* it's ours, the nested hypervisor must not see this one */
2594 return NESTED_EXIT_HOST;
2595 }
2596
2597 static int nested_svm_exit_special(struct vcpu_svm *svm)
2598 {
2599 u32 exit_code = svm->vmcb->control.exit_code;
2600
2601 switch (exit_code) {
2602 case SVM_EXIT_INTR:
2603 case SVM_EXIT_NMI:
2604 case SVM_EXIT_EXCP_BASE + MC_VECTOR:
2605 return NESTED_EXIT_HOST;
2606 case SVM_EXIT_NPF:
2607 /* For now we are always handling NPFs when using them */
2608 if (npt_enabled)
2609 return NESTED_EXIT_HOST;
2610 break;
2611 case SVM_EXIT_EXCP_BASE + PF_VECTOR:
2612 /* When we're shadowing, trap PFs, but not async PF */
2613 if (!npt_enabled && svm->vcpu.arch.apf.host_apf_reason == 0)
2614 return NESTED_EXIT_HOST;
2615 break;
2616 default:
2617 break;
2618 }
2619
2620 return NESTED_EXIT_CONTINUE;
2621 }
2622
2623 /*
2624 * If this function returns true, this #vmexit was already handled
2625 */
2626 static int nested_svm_intercept(struct vcpu_svm *svm)
2627 {
2628 u32 exit_code = svm->vmcb->control.exit_code;
2629 int vmexit = NESTED_EXIT_HOST;
2630
2631 switch (exit_code) {
2632 case SVM_EXIT_MSR:
2633 vmexit = nested_svm_exit_handled_msr(svm);
2634 break;
2635 case SVM_EXIT_IOIO:
2636 vmexit = nested_svm_intercept_ioio(svm);
2637 break;
2638 case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
2639 u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
2640 if (svm->nested.intercept_cr & bit)
2641 vmexit = NESTED_EXIT_DONE;
2642 break;
2643 }
2644 case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
2645 u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
2646 if (svm->nested.intercept_dr & bit)
2647 vmexit = NESTED_EXIT_DONE;
2648 break;
2649 }
2650 case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
2651 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
2652 if (svm->nested.intercept_exceptions & excp_bits) {
2653 if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR)
2654 vmexit = nested_svm_intercept_db(svm);
2655 else
2656 vmexit = NESTED_EXIT_DONE;
2657 }
2658 /* async page fault always cause vmexit */
2659 else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) &&
2660 svm->vcpu.arch.exception.nested_apf != 0)
2661 vmexit = NESTED_EXIT_DONE;
2662 break;
2663 }
2664 case SVM_EXIT_ERR: {
2665 vmexit = NESTED_EXIT_DONE;
2666 break;
2667 }
2668 default: {
2669 u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
2670 if (svm->nested.intercept & exit_bits)
2671 vmexit = NESTED_EXIT_DONE;
2672 }
2673 }
2674
2675 return vmexit;
2676 }
2677
2678 static int nested_svm_exit_handled(struct vcpu_svm *svm)
2679 {
2680 int vmexit;
2681
2682 vmexit = nested_svm_intercept(svm);
2683
2684 if (vmexit == NESTED_EXIT_DONE)
2685 nested_svm_vmexit(svm);
2686
2687 return vmexit;
2688 }
2689
2690 static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb)
2691 {
2692 struct vmcb_control_area *dst = &dst_vmcb->control;
2693 struct vmcb_control_area *from = &from_vmcb->control;
2694
2695 dst->intercept_cr = from->intercept_cr;
2696 dst->intercept_dr = from->intercept_dr;
2697 dst->intercept_exceptions = from->intercept_exceptions;
2698 dst->intercept = from->intercept;
2699 dst->iopm_base_pa = from->iopm_base_pa;
2700 dst->msrpm_base_pa = from->msrpm_base_pa;
2701 dst->tsc_offset = from->tsc_offset;
2702 dst->asid = from->asid;
2703 dst->tlb_ctl = from->tlb_ctl;
2704 dst->int_ctl = from->int_ctl;
2705 dst->int_vector = from->int_vector;
2706 dst->int_state = from->int_state;
2707 dst->exit_code = from->exit_code;
2708 dst->exit_code_hi = from->exit_code_hi;
2709 dst->exit_info_1 = from->exit_info_1;
2710 dst->exit_info_2 = from->exit_info_2;
2711 dst->exit_int_info = from->exit_int_info;
2712 dst->exit_int_info_err = from->exit_int_info_err;
2713 dst->nested_ctl = from->nested_ctl;
2714 dst->event_inj = from->event_inj;
2715 dst->event_inj_err = from->event_inj_err;
2716 dst->nested_cr3 = from->nested_cr3;
2717 dst->virt_ext = from->virt_ext;
2718 }
2719
2720 static int nested_svm_vmexit(struct vcpu_svm *svm)
2721 {
2722 struct vmcb *nested_vmcb;
2723 struct vmcb *hsave = svm->nested.hsave;
2724 struct vmcb *vmcb = svm->vmcb;
2725 struct page *page;
2726
2727 trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
2728 vmcb->control.exit_info_1,
2729 vmcb->control.exit_info_2,
2730 vmcb->control.exit_int_info,
2731 vmcb->control.exit_int_info_err,
2732 KVM_ISA_SVM);
2733
2734 nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page);
2735 if (!nested_vmcb)
2736 return 1;
2737
2738 /* Exit Guest-Mode */
2739 leave_guest_mode(&svm->vcpu);
2740 svm->nested.vmcb = 0;
2741
2742 /* Give the current vmcb to the guest */
2743 disable_gif(svm);
2744
2745 nested_vmcb->save.es = vmcb->save.es;
2746 nested_vmcb->save.cs = vmcb->save.cs;
2747 nested_vmcb->save.ss = vmcb->save.ss;
2748 nested_vmcb->save.ds = vmcb->save.ds;
2749 nested_vmcb->save.gdtr = vmcb->save.gdtr;
2750 nested_vmcb->save.idtr = vmcb->save.idtr;
2751 nested_vmcb->save.efer = svm->vcpu.arch.efer;
2752 nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu);
2753 nested_vmcb->save.cr3 = kvm_read_cr3(&svm->vcpu);
2754 nested_vmcb->save.cr2 = vmcb->save.cr2;
2755 nested_vmcb->save.cr4 = svm->vcpu.arch.cr4;
2756 nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
2757 nested_vmcb->save.rip = vmcb->save.rip;
2758 nested_vmcb->save.rsp = vmcb->save.rsp;
2759 nested_vmcb->save.rax = vmcb->save.rax;
2760 nested_vmcb->save.dr7 = vmcb->save.dr7;
2761 nested_vmcb->save.dr6 = vmcb->save.dr6;
2762 nested_vmcb->save.cpl = vmcb->save.cpl;
2763
2764 nested_vmcb->control.int_ctl = vmcb->control.int_ctl;
2765 nested_vmcb->control.int_vector = vmcb->control.int_vector;
2766 nested_vmcb->control.int_state = vmcb->control.int_state;
2767 nested_vmcb->control.exit_code = vmcb->control.exit_code;
2768 nested_vmcb->control.exit_code_hi = vmcb->control.exit_code_hi;
2769 nested_vmcb->control.exit_info_1 = vmcb->control.exit_info_1;
2770 nested_vmcb->control.exit_info_2 = vmcb->control.exit_info_2;
2771 nested_vmcb->control.exit_int_info = vmcb->control.exit_int_info;
2772 nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
2773
2774 if (svm->nrips_enabled)
2775 nested_vmcb->control.next_rip = vmcb->control.next_rip;
2776
2777 /*
2778 * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have
2779 * to make sure that we do not lose injected events. So check event_inj
2780 * here and copy it to exit_int_info if it is valid.
2781 * Exit_int_info and event_inj can't be both valid because the case
2782 * below only happens on a VMRUN instruction intercept which has
2783 * no valid exit_int_info set.
2784 */
2785 if (vmcb->control.event_inj & SVM_EVTINJ_VALID) {
2786 struct vmcb_control_area *nc = &nested_vmcb->control;
2787
2788 nc->exit_int_info = vmcb->control.event_inj;
2789 nc->exit_int_info_err = vmcb->control.event_inj_err;
2790 }
2791
2792 nested_vmcb->control.tlb_ctl = 0;
2793 nested_vmcb->control.event_inj = 0;
2794 nested_vmcb->control.event_inj_err = 0;
2795
2796 /* We always set V_INTR_MASKING and remember the old value in hflags */
2797 if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
2798 nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
2799
2800 /* Restore the original control entries */
2801 copy_vmcb_control_area(vmcb, hsave);
2802
2803 kvm_clear_exception_queue(&svm->vcpu);
2804 kvm_clear_interrupt_queue(&svm->vcpu);
2805
2806 svm->nested.nested_cr3 = 0;
2807
2808 /* Restore selected save entries */
2809 svm->vmcb->save.es = hsave->save.es;
2810 svm->vmcb->save.cs = hsave->save.cs;
2811 svm->vmcb->save.ss = hsave->save.ss;
2812 svm->vmcb->save.ds = hsave->save.ds;
2813 svm->vmcb->save.gdtr = hsave->save.gdtr;
2814 svm->vmcb->save.idtr = hsave->save.idtr;
2815 kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
2816 svm_set_efer(&svm->vcpu, hsave->save.efer);
2817 svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
2818 svm_set_cr4(&svm->vcpu, hsave->save.cr4);
2819 if (npt_enabled) {
2820 svm->vmcb->save.cr3 = hsave->save.cr3;
2821 svm->vcpu.arch.cr3 = hsave->save.cr3;
2822 } else {
2823 (void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
2824 }
2825 kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
2826 kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
2827 kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
2828 svm->vmcb->save.dr7 = 0;
2829 svm->vmcb->save.cpl = 0;
2830 svm->vmcb->control.exit_int_info = 0;
2831
2832 mark_all_dirty(svm->vmcb);
2833
2834 nested_svm_unmap(page);
2835
2836 nested_svm_uninit_mmu_context(&svm->vcpu);
2837 kvm_mmu_reset_context(&svm->vcpu);
2838 kvm_mmu_load(&svm->vcpu);
2839
2840 return 0;
2841 }
2842
2843 static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
2844 {
2845 /*
2846 * This function merges the msr permission bitmaps of kvm and the
2847 * nested vmcb. It is optimized in that it only merges the parts where
2848 * the kvm msr permission bitmap may contain zero bits
2849 */
2850 int i;
2851
2852 if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
2853 return true;
2854
2855 for (i = 0; i < MSRPM_OFFSETS; i++) {
2856 u32 value, p;
2857 u64 offset;
2858
2859 if (msrpm_offsets[i] == 0xffffffff)
2860 break;
2861
2862 p = msrpm_offsets[i];
2863 offset = svm->nested.vmcb_msrpm + (p * 4);
2864
2865 if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
2866 return false;
2867
2868 svm->nested.msrpm[p] = svm->msrpm[p] | value;
2869 }
2870
2871 svm->vmcb->control.msrpm_base_pa = __pa(svm->nested.msrpm);
2872
2873 return true;
2874 }
2875
2876 static bool nested_vmcb_checks(struct vmcb *vmcb)
2877 {
2878 if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
2879 return false;
2880
2881 if (vmcb->control.asid == 0)
2882 return false;
2883
2884 if (vmcb->control.nested_ctl && !npt_enabled)
2885 return false;
2886
2887 return true;
2888 }
2889
2890 static bool nested_svm_vmrun(struct vcpu_svm *svm)
2891 {
2892 struct vmcb *nested_vmcb;
2893 struct vmcb *hsave = svm->nested.hsave;
2894 struct vmcb *vmcb = svm->vmcb;
2895 struct page *page;
2896 u64 vmcb_gpa;
2897
2898 vmcb_gpa = svm->vmcb->save.rax;
2899
2900 nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
2901 if (!nested_vmcb)
2902 return false;
2903
2904 if (!nested_vmcb_checks(nested_vmcb)) {
2905 nested_vmcb->control.exit_code = SVM_EXIT_ERR;
2906 nested_vmcb->control.exit_code_hi = 0;
2907 nested_vmcb->control.exit_info_1 = 0;
2908 nested_vmcb->control.exit_info_2 = 0;
2909
2910 nested_svm_unmap(page);
2911
2912 return false;
2913 }
2914
2915 trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
2916 nested_vmcb->save.rip,
2917 nested_vmcb->control.int_ctl,
2918 nested_vmcb->control.event_inj,
2919 nested_vmcb->control.nested_ctl);
2920
2921 trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
2922 nested_vmcb->control.intercept_cr >> 16,
2923 nested_vmcb->control.intercept_exceptions,
2924 nested_vmcb->control.intercept);
2925
2926 /* Clear internal status */
2927 kvm_clear_exception_queue(&svm->vcpu);
2928 kvm_clear_interrupt_queue(&svm->vcpu);
2929
2930 /*
2931 * Save the old vmcb, so we don't need to pick what we save, but can
2932 * restore everything when a VMEXIT occurs
2933 */
2934 hsave->save.es = vmcb->save.es;
2935 hsave->save.cs = vmcb->save.cs;
2936 hsave->save.ss = vmcb->save.ss;
2937 hsave->save.ds = vmcb->save.ds;
2938 hsave->save.gdtr = vmcb->save.gdtr;
2939 hsave->save.idtr = vmcb->save.idtr;
2940 hsave->save.efer = svm->vcpu.arch.efer;
2941 hsave->save.cr0 = kvm_read_cr0(&svm->vcpu);
2942 hsave->save.cr4 = svm->vcpu.arch.cr4;
2943 hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
2944 hsave->save.rip = kvm_rip_read(&svm->vcpu);
2945 hsave->save.rsp = vmcb->save.rsp;
2946 hsave->save.rax = vmcb->save.rax;
2947 if (npt_enabled)
2948 hsave->save.cr3 = vmcb->save.cr3;
2949 else
2950 hsave->save.cr3 = kvm_read_cr3(&svm->vcpu);
2951
2952 copy_vmcb_control_area(hsave, vmcb);
2953
2954 if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF)
2955 svm->vcpu.arch.hflags |= HF_HIF_MASK;
2956 else
2957 svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
2958
2959 if (nested_vmcb->control.nested_ctl) {
2960 kvm_mmu_unload(&svm->vcpu);
2961 svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
2962 nested_svm_init_mmu_context(&svm->vcpu);
2963 }
2964
2965 /* Load the nested guest state */
2966 svm->vmcb->save.es = nested_vmcb->save.es;
2967 svm->vmcb->save.cs = nested_vmcb->save.cs;
2968 svm->vmcb->save.ss = nested_vmcb->save.ss;
2969 svm->vmcb->save.ds = nested_vmcb->save.ds;
2970 svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
2971 svm->vmcb->save.idtr = nested_vmcb->save.idtr;
2972 kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
2973 svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
2974 svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
2975 svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
2976 if (npt_enabled) {
2977 svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
2978 svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
2979 } else
2980 (void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
2981
2982 /* Guest paging mode is active - reset mmu */
2983 kvm_mmu_reset_context(&svm->vcpu);
2984
2985 svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
2986 kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
2987 kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
2988 kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);
2989
2990 /* In case we don't even reach vcpu_run, the fields are not updated */
2991 svm->vmcb->save.rax = nested_vmcb->save.rax;
2992 svm->vmcb->save.rsp = nested_vmcb->save.rsp;
2993 svm->vmcb->save.rip = nested_vmcb->save.rip;
2994 svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
2995 svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
2996 svm->vmcb->save.cpl = nested_vmcb->save.cpl;
2997
2998 svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
2999 svm->nested.vmcb_iopm = nested_vmcb->control.iopm_base_pa & ~0x0fffULL;
3000
3001 /* cache intercepts */
3002 svm->nested.intercept_cr = nested_vmcb->control.intercept_cr;
3003 svm->nested.intercept_dr = nested_vmcb->control.intercept_dr;
3004 svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
3005 svm->nested.intercept = nested_vmcb->control.intercept;
3006
3007 svm_flush_tlb(&svm->vcpu);
3008 svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
3009 if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
3010 svm->vcpu.arch.hflags |= HF_VINTR_MASK;
3011 else
3012 svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;
3013
3014 if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
3015 /* We only want the cr8 intercept bits of the guest */
3016 clr_cr_intercept(svm, INTERCEPT_CR8_READ);
3017 clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
3018 }
3019
3020 /* We don't want to see VMMCALLs from a nested guest */
3021 clr_intercept(svm, INTERCEPT_VMMCALL);
3022
3023 svm->vmcb->control.virt_ext = nested_vmcb->control.virt_ext;
3024 svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
3025 svm->vmcb->control.int_state = nested_vmcb->control.int_state;
3026 svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
3027 svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
3028 svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;
3029
3030 nested_svm_unmap(page);
3031
3032 /* Enter Guest-Mode */
3033 enter_guest_mode(&svm->vcpu);
3034
3035 /*
3036 * Merge guest and host intercepts - must be called with vcpu in
3037 * guest-mode to take affect here
3038 */
3039 recalc_intercepts(svm);
3040
3041 svm->nested.vmcb = vmcb_gpa;
3042
3043 enable_gif(svm);
3044
3045 mark_all_dirty(svm->vmcb);
3046
3047 return true;
3048 }
3049
3050 static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
3051 {
3052 to_vmcb->save.fs = from_vmcb->save.fs;
3053 to_vmcb->save.gs = from_vmcb->save.gs;
3054 to_vmcb->save.tr = from_vmcb->save.tr;
3055 to_vmcb->save.ldtr = from_vmcb->save.ldtr;
3056 to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
3057 to_vmcb->save.star = from_vmcb->save.star;
3058 to_vmcb->save.lstar = from_vmcb->save.lstar;
3059 to_vmcb->save.cstar = from_vmcb->save.cstar;
3060 to_vmcb->save.sfmask = from_vmcb->save.sfmask;
3061 to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
3062 to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
3063 to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
3064 }
3065
3066 static int vmload_interception(struct vcpu_svm *svm)
3067 {
3068 struct vmcb *nested_vmcb;
3069 struct page *page;
3070 int ret;
3071
3072 if (nested_svm_check_permissions(svm))
3073 return 1;
3074
3075 nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
3076 if (!nested_vmcb)
3077 return 1;
3078
3079 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3080 ret = kvm_skip_emulated_instruction(&svm->vcpu);
3081
3082 nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
3083 nested_svm_unmap(page);
3084
3085 return ret;
3086 }
3087
3088 static int vmsave_interception(struct vcpu_svm *svm)
3089 {
3090 struct vmcb *nested_vmcb;
3091 struct page *page;
3092 int ret;
3093
3094 if (nested_svm_check_permissions(svm))
3095 return 1;
3096
3097 nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
3098 if (!nested_vmcb)
3099 return 1;
3100
3101 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3102 ret = kvm_skip_emulated_instruction(&svm->vcpu);
3103
3104 nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
3105 nested_svm_unmap(page);
3106
3107 return ret;
3108 }
3109
3110 static int vmrun_interception(struct vcpu_svm *svm)
3111 {
3112 if (nested_svm_check_permissions(svm))
3113 return 1;
3114
3115 /* Save rip after vmrun instruction */
3116 kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);
3117
3118 if (!nested_svm_vmrun(svm))
3119 return 1;
3120
3121 if (!nested_svm_vmrun_msrpm(svm))
3122 goto failed;
3123
3124 return 1;
3125
3126 failed:
3127
3128 svm->vmcb->control.exit_code = SVM_EXIT_ERR;
3129 svm->vmcb->control.exit_code_hi = 0;
3130 svm->vmcb->control.exit_info_1 = 0;
3131 svm->vmcb->control.exit_info_2 = 0;
3132
3133 nested_svm_vmexit(svm);
3134
3135 return 1;
3136 }
3137
3138 static int stgi_interception(struct vcpu_svm *svm)
3139 {
3140 int ret;
3141
3142 if (nested_svm_check_permissions(svm))
3143 return 1;
3144
3145 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3146 ret = kvm_skip_emulated_instruction(&svm->vcpu);
3147 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3148
3149 enable_gif(svm);
3150
3151 return ret;
3152 }
3153
3154 static int clgi_interception(struct vcpu_svm *svm)
3155 {
3156 int ret;
3157
3158 if (nested_svm_check_permissions(svm))
3159 return 1;
3160
3161 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3162 ret = kvm_skip_emulated_instruction(&svm->vcpu);
3163
3164 disable_gif(svm);
3165
3166 /* After a CLGI no interrupts should come */
3167 if (!kvm_vcpu_apicv_active(&svm->vcpu)) {
3168 svm_clear_vintr(svm);
3169 svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
3170 mark_dirty(svm->vmcb, VMCB_INTR);
3171 }
3172
3173 return ret;
3174 }
3175
3176 static int invlpga_interception(struct vcpu_svm *svm)
3177 {
3178 struct kvm_vcpu *vcpu = &svm->vcpu;
3179
3180 trace_kvm_invlpga(svm->vmcb->save.rip, kvm_register_read(&svm->vcpu, VCPU_REGS_RCX),
3181 kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3182
3183 /* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
3184 kvm_mmu_invlpg(vcpu, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3185
3186 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3187 return kvm_skip_emulated_instruction(&svm->vcpu);
3188 }
3189
3190 static int skinit_interception(struct vcpu_svm *svm)
3191 {
3192 trace_kvm_skinit(svm->vmcb->save.rip, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3193
3194 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
3195 return 1;
3196 }
3197
3198 static int wbinvd_interception(struct vcpu_svm *svm)
3199 {
3200 return kvm_emulate_wbinvd(&svm->vcpu);
3201 }
3202
3203 static int xsetbv_interception(struct vcpu_svm *svm)
3204 {
3205 u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
3206 u32 index = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
3207
3208 if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
3209 svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3210 return kvm_skip_emulated_instruction(&svm->vcpu);
3211 }
3212
3213 return 1;
3214 }
3215
3216 static int task_switch_interception(struct vcpu_svm *svm)
3217 {
3218 u16 tss_selector;
3219 int reason;
3220 int int_type = svm->vmcb->control.exit_int_info &
3221 SVM_EXITINTINFO_TYPE_MASK;
3222 int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
3223 uint32_t type =
3224 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
3225 uint32_t idt_v =
3226 svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
3227 bool has_error_code = false;
3228 u32 error_code = 0;
3229
3230 tss_selector = (u16)svm->vmcb->control.exit_info_1;
3231
3232 if (svm->vmcb->control.exit_info_2 &
3233 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
3234 reason = TASK_SWITCH_IRET;
3235 else if (svm->vmcb->control.exit_info_2 &
3236 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
3237 reason = TASK_SWITCH_JMP;
3238 else if (idt_v)
3239 reason = TASK_SWITCH_GATE;
3240 else
3241 reason = TASK_SWITCH_CALL;
3242
3243 if (reason == TASK_SWITCH_GATE) {
3244 switch (type) {
3245 case SVM_EXITINTINFO_TYPE_NMI:
3246 svm->vcpu.arch.nmi_injected = false;
3247 break;
3248 case SVM_EXITINTINFO_TYPE_EXEPT:
3249 if (svm->vmcb->control.exit_info_2 &
3250 (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
3251 has_error_code = true;
3252 error_code =
3253 (u32)svm->vmcb->control.exit_info_2;
3254 }
3255 kvm_clear_exception_queue(&svm->vcpu);
3256 break;
3257 case SVM_EXITINTINFO_TYPE_INTR:
3258 kvm_clear_interrupt_queue(&svm->vcpu);
3259 break;
3260 default:
3261 break;
3262 }
3263 }
3264
3265 if (reason != TASK_SWITCH_GATE ||
3266 int_type == SVM_EXITINTINFO_TYPE_SOFT ||
3267 (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
3268 (int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
3269 skip_emulated_instruction(&svm->vcpu);
3270
3271 if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
3272 int_vec = -1;
3273
3274 if (kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
3275 has_error_code, error_code) == EMULATE_FAIL) {
3276 svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
3277 svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
3278 svm->vcpu.run->internal.ndata = 0;
3279 return 0;
3280 }
3281 return 1;
3282 }
3283
3284 static int cpuid_interception(struct vcpu_svm *svm)
3285 {
3286 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3287 return kvm_emulate_cpuid(&svm->vcpu);
3288 }
3289
3290 static int iret_interception(struct vcpu_svm *svm)
3291 {
3292 ++svm->vcpu.stat.nmi_window_exits;
3293 clr_intercept(svm, INTERCEPT_IRET);
3294 svm->vcpu.arch.hflags |= HF_IRET_MASK;
3295 svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu);
3296 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3297 return 1;
3298 }
3299
3300 static int invlpg_interception(struct vcpu_svm *svm)
3301 {
3302 if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
3303 return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
3304
3305 kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
3306 return kvm_skip_emulated_instruction(&svm->vcpu);
3307 }
3308
3309 static int emulate_on_interception(struct vcpu_svm *svm)
3310 {
3311 return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
3312 }
3313
3314 static int rdpmc_interception(struct vcpu_svm *svm)
3315 {
3316 int err;
3317
3318 if (!static_cpu_has(X86_FEATURE_NRIPS))
3319 return emulate_on_interception(svm);
3320
3321 err = kvm_rdpmc(&svm->vcpu);
3322 return kvm_complete_insn_gp(&svm->vcpu, err);
3323 }
3324
3325 static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
3326 unsigned long val)
3327 {
3328 unsigned long cr0 = svm->vcpu.arch.cr0;
3329 bool ret = false;
3330 u64 intercept;
3331
3332 intercept = svm->nested.intercept;
3333
3334 if (!is_guest_mode(&svm->vcpu) ||
3335 (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0))))
3336 return false;
3337
3338 cr0 &= ~SVM_CR0_SELECTIVE_MASK;
3339 val &= ~SVM_CR0_SELECTIVE_MASK;
3340
3341 if (cr0 ^ val) {
3342 svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
3343 ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE);
3344 }
3345
3346 return ret;
3347 }
3348
3349 #define CR_VALID (1ULL << 63)
3350
3351 static int cr_interception(struct vcpu_svm *svm)
3352 {
3353 int reg, cr;
3354 unsigned long val;
3355 int err;
3356
3357 if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
3358 return emulate_on_interception(svm);
3359
3360 if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
3361 return emulate_on_interception(svm);
3362
3363 reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
3364 if (svm->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE)
3365 cr = SVM_EXIT_WRITE_CR0 - SVM_EXIT_READ_CR0;
3366 else
3367 cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;
3368
3369 err = 0;
3370 if (cr >= 16) { /* mov to cr */
3371 cr -= 16;
3372 val = kvm_register_read(&svm->vcpu, reg);
3373 switch (cr) {
3374 case 0:
3375 if (!check_selective_cr0_intercepted(svm, val))
3376 err = kvm_set_cr0(&svm->vcpu, val);
3377 else
3378 return 1;
3379
3380 break;
3381 case 3:
3382 err = kvm_set_cr3(&svm->vcpu, val);
3383 break;
3384 case 4:
3385 err = kvm_set_cr4(&svm->vcpu, val);
3386 break;
3387 case 8:
3388 err = kvm_set_cr8(&svm->vcpu, val);
3389 break;
3390 default:
3391 WARN(1, "unhandled write to CR%d", cr);
3392 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
3393 return 1;
3394 }
3395 } else { /* mov from cr */
3396 switch (cr) {
3397 case 0:
3398 val = kvm_read_cr0(&svm->vcpu);
3399 break;
3400 case 2:
3401 val = svm->vcpu.arch.cr2;
3402 break;
3403 case 3:
3404 val = kvm_read_cr3(&svm->vcpu);
3405 break;
3406 case 4:
3407 val = kvm_read_cr4(&svm->vcpu);
3408 break;
3409 case 8:
3410 val = kvm_get_cr8(&svm->vcpu);
3411 break;
3412 default:
3413 WARN(1, "unhandled read from CR%d", cr);
3414 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
3415 return 1;
3416 }
3417 kvm_register_write(&svm->vcpu, reg, val);
3418 }
3419 return kvm_complete_insn_gp(&svm->vcpu, err);
3420 }
3421
3422 static int dr_interception(struct vcpu_svm *svm)
3423 {
3424 int reg, dr;
3425 unsigned long val;
3426
3427 if (svm->vcpu.guest_debug == 0) {
3428 /*
3429 * No more DR vmexits; force a reload of the debug registers
3430 * and reenter on this instruction. The next vmexit will
3431 * retrieve the full state of the debug registers.
3432 */
3433 clr_dr_intercepts(svm);
3434 svm->vcpu.arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
3435 return 1;
3436 }
3437
3438 if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
3439 return emulate_on_interception(svm);
3440
3441 reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
3442 dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
3443
3444 if (dr >= 16) { /* mov to DRn */
3445 if (!kvm_require_dr(&svm->vcpu, dr - 16))
3446 return 1;
3447 val = kvm_register_read(&svm->vcpu, reg);
3448 kvm_set_dr(&svm->vcpu, dr - 16, val);
3449 } else {
3450 if (!kvm_require_dr(&svm->vcpu, dr))
3451 return 1;
3452 kvm_get_dr(&svm->vcpu, dr, &val);
3453 kvm_register_write(&svm->vcpu, reg, val);
3454 }
3455
3456 return kvm_skip_emulated_instruction(&svm->vcpu);
3457 }
3458
3459 static int cr8_write_interception(struct vcpu_svm *svm)
3460 {
3461 struct kvm_run *kvm_run = svm->vcpu.run;
3462 int r;
3463
3464 u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
3465 /* instruction emulation calls kvm_set_cr8() */
3466 r = cr_interception(svm);
3467 if (lapic_in_kernel(&svm->vcpu))
3468 return r;
3469 if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
3470 return r;
3471 kvm_run->exit_reason = KVM_EXIT_SET_TPR;
3472 return 0;
3473 }
3474
3475 static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
3476 {
3477 struct vcpu_svm *svm = to_svm(vcpu);
3478
3479 switch (msr_info->index) {
3480 case MSR_IA32_TSC: {
3481 msr_info->data = svm->vmcb->control.tsc_offset +
3482 kvm_scale_tsc(vcpu, rdtsc());
3483
3484 break;
3485 }
3486 case MSR_STAR:
3487 msr_info->data = svm->vmcb->save.star;
3488 break;
3489 #ifdef CONFIG_X86_64
3490 case MSR_LSTAR:
3491 msr_info->data = svm->vmcb->save.lstar;
3492 break;
3493 case MSR_CSTAR:
3494 msr_info->data = svm->vmcb->save.cstar;
3495 break;
3496 case MSR_KERNEL_GS_BASE:
3497 msr_info->data = svm->vmcb->save.kernel_gs_base;
3498 break;
3499 case MSR_SYSCALL_MASK:
3500 msr_info->data = svm->vmcb->save.sfmask;
3501 break;
3502 #endif
3503 case MSR_IA32_SYSENTER_CS:
3504 msr_info->data = svm->vmcb->save.sysenter_cs;
3505 break;
3506 case MSR_IA32_SYSENTER_EIP:
3507 msr_info->data = svm->sysenter_eip;
3508 break;
3509 case MSR_IA32_SYSENTER_ESP:
3510 msr_info->data = svm->sysenter_esp;
3511 break;
3512 case MSR_TSC_AUX:
3513 if (!boot_cpu_has(X86_FEATURE_RDTSCP))
3514 return 1;
3515 msr_info->data = svm->tsc_aux;
3516 break;
3517 /*
3518 * Nobody will change the following 5 values in the VMCB so we can
3519 * safely return them on rdmsr. They will always be 0 until LBRV is
3520 * implemented.
3521 */
3522 case MSR_IA32_DEBUGCTLMSR:
3523 msr_info->data = svm->vmcb->save.dbgctl;
3524 break;
3525 case MSR_IA32_LASTBRANCHFROMIP:
3526 msr_info->data = svm->vmcb->save.br_from;
3527 break;
3528 case MSR_IA32_LASTBRANCHTOIP:
3529 msr_info->data = svm->vmcb->save.br_to;
3530 break;
3531 case MSR_IA32_LASTINTFROMIP:
3532 msr_info->data = svm->vmcb->save.last_excp_from;
3533 break;
3534 case MSR_IA32_LASTINTTOIP:
3535 msr_info->data = svm->vmcb->save.last_excp_to;
3536 break;
3537 case MSR_VM_HSAVE_PA:
3538 msr_info->data = svm->nested.hsave_msr;
3539 break;
3540 case MSR_VM_CR:
3541 msr_info->data = svm->nested.vm_cr_msr;
3542 break;
3543 case MSR_IA32_UCODE_REV:
3544 msr_info->data = 0x01000065;
3545 break;
3546 case MSR_F15H_IC_CFG: {
3547
3548 int family, model;
3549
3550 family = guest_cpuid_family(vcpu);
3551 model = guest_cpuid_model(vcpu);
3552
3553 if (family < 0 || model < 0)
3554 return kvm_get_msr_common(vcpu, msr_info);
3555
3556 msr_info->data = 0;
3557
3558 if (family == 0x15 &&
3559 (model >= 0x2 && model < 0x20))
3560 msr_info->data = 0x1E;
3561 }
3562 break;
3563 default:
3564 return kvm_get_msr_common(vcpu, msr_info);
3565 }
3566 return 0;
3567 }
3568
3569 static int rdmsr_interception(struct vcpu_svm *svm)
3570 {
3571 u32 ecx = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
3572 struct msr_data msr_info;
3573
3574 msr_info.index = ecx;
3575 msr_info.host_initiated = false;
3576 if (svm_get_msr(&svm->vcpu, &msr_info)) {
3577 trace_kvm_msr_read_ex(ecx);
3578 kvm_inject_gp(&svm->vcpu, 0);
3579 return 1;
3580 } else {
3581 trace_kvm_msr_read(ecx, msr_info.data);
3582
3583 kvm_register_write(&svm->vcpu, VCPU_REGS_RAX,
3584 msr_info.data & 0xffffffff);
3585 kvm_register_write(&svm->vcpu, VCPU_REGS_RDX,
3586 msr_info.data >> 32);
3587 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3588 return kvm_skip_emulated_instruction(&svm->vcpu);
3589 }
3590 }
3591
3592 static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
3593 {
3594 struct vcpu_svm *svm = to_svm(vcpu);
3595 int svm_dis, chg_mask;
3596
3597 if (data & ~SVM_VM_CR_VALID_MASK)
3598 return 1;
3599
3600 chg_mask = SVM_VM_CR_VALID_MASK;
3601
3602 if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
3603 chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);
3604
3605 svm->nested.vm_cr_msr &= ~chg_mask;
3606 svm->nested.vm_cr_msr |= (data & chg_mask);
3607
3608 svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;
3609
3610 /* check for svm_disable while efer.svme is set */
3611 if (svm_dis && (vcpu->arch.efer & EFER_SVME))
3612 return 1;
3613
3614 return 0;
3615 }
3616
3617 static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
3618 {
3619 struct vcpu_svm *svm = to_svm(vcpu);
3620
3621 u32 ecx = msr->index;
3622 u64 data = msr->data;
3623 switch (ecx) {
3624 case MSR_IA32_TSC:
3625 kvm_write_tsc(vcpu, msr);
3626 break;
3627 case MSR_STAR:
3628 svm->vmcb->save.star = data;
3629 break;
3630 #ifdef CONFIG_X86_64
3631 case MSR_LSTAR:
3632 svm->vmcb->save.lstar = data;
3633 break;
3634 case MSR_CSTAR:
3635 svm->vmcb->save.cstar = data;
3636 break;
3637 case MSR_KERNEL_GS_BASE:
3638 svm->vmcb->save.kernel_gs_base = data;
3639 break;
3640 case MSR_SYSCALL_MASK:
3641 svm->vmcb->save.sfmask = data;
3642 break;
3643 #endif
3644 case MSR_IA32_SYSENTER_CS:
3645 svm->vmcb->save.sysenter_cs = data;
3646 break;
3647 case MSR_IA32_SYSENTER_EIP:
3648 svm->sysenter_eip = data;
3649 svm->vmcb->save.sysenter_eip = data;
3650 break;
3651 case MSR_IA32_SYSENTER_ESP:
3652 svm->sysenter_esp = data;
3653 svm->vmcb->save.sysenter_esp = data;
3654 break;
3655 case MSR_TSC_AUX:
3656 if (!boot_cpu_has(X86_FEATURE_RDTSCP))
3657 return 1;
3658
3659 /*
3660 * This is rare, so we update the MSR here instead of using
3661 * direct_access_msrs. Doing that would require a rdmsr in
3662 * svm_vcpu_put.
3663 */
3664 svm->tsc_aux = data;
3665 wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
3666 break;
3667 case MSR_IA32_DEBUGCTLMSR:
3668 if (!boot_cpu_has(X86_FEATURE_LBRV)) {
3669 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
3670 __func__, data);
3671 break;
3672 }
3673 if (data & DEBUGCTL_RESERVED_BITS)
3674 return 1;
3675
3676 svm->vmcb->save.dbgctl = data;
3677 mark_dirty(svm->vmcb, VMCB_LBR);
3678 if (data & (1ULL<<0))
3679 svm_enable_lbrv(svm);
3680 else
3681 svm_disable_lbrv(svm);
3682 break;
3683 case MSR_VM_HSAVE_PA:
3684 svm->nested.hsave_msr = data;
3685 break;
3686 case MSR_VM_CR:
3687 return svm_set_vm_cr(vcpu, data);
3688 case MSR_VM_IGNNE:
3689 vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
3690 break;
3691 case MSR_IA32_APICBASE:
3692 if (kvm_vcpu_apicv_active(vcpu))
3693 avic_update_vapic_bar(to_svm(vcpu), data);
3694 /* Follow through */
3695 default:
3696 return kvm_set_msr_common(vcpu, msr);
3697 }
3698 return 0;
3699 }
3700
3701 static int wrmsr_interception(struct vcpu_svm *svm)
3702 {
3703 struct msr_data msr;
3704 u32 ecx = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
3705 u64 data = kvm_read_edx_eax(&svm->vcpu);
3706
3707 msr.data = data;
3708 msr.index = ecx;
3709 msr.host_initiated = false;
3710
3711 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3712 if (kvm_set_msr(&svm->vcpu, &msr)) {
3713 trace_kvm_msr_write_ex(ecx, data);
3714 kvm_inject_gp(&svm->vcpu, 0);
3715 return 1;
3716 } else {
3717 trace_kvm_msr_write(ecx, data);
3718 return kvm_skip_emulated_instruction(&svm->vcpu);
3719 }
3720 }
3721
3722 static int msr_interception(struct vcpu_svm *svm)
3723 {
3724 if (svm->vmcb->control.exit_info_1)
3725 return wrmsr_interception(svm);
3726 else
3727 return rdmsr_interception(svm);
3728 }
3729
3730 static int interrupt_window_interception(struct vcpu_svm *svm)
3731 {
3732 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3733 svm_clear_vintr(svm);
3734 svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
3735 mark_dirty(svm->vmcb, VMCB_INTR);
3736 ++svm->vcpu.stat.irq_window_exits;
3737 return 1;
3738 }
3739
3740 static int pause_interception(struct vcpu_svm *svm)
3741 {
3742 kvm_vcpu_on_spin(&(svm->vcpu));
3743 return 1;
3744 }
3745
3746 static int nop_interception(struct vcpu_svm *svm)
3747 {
3748 return kvm_skip_emulated_instruction(&(svm->vcpu));
3749 }
3750
3751 static int monitor_interception(struct vcpu_svm *svm)
3752 {
3753 printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n");
3754 return nop_interception(svm);
3755 }
3756
3757 static int mwait_interception(struct vcpu_svm *svm)
3758 {
3759 printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n");
3760 return nop_interception(svm);
3761 }
3762
3763 enum avic_ipi_failure_cause {
3764 AVIC_IPI_FAILURE_INVALID_INT_TYPE,
3765 AVIC_IPI_FAILURE_TARGET_NOT_RUNNING,
3766 AVIC_IPI_FAILURE_INVALID_TARGET,
3767 AVIC_IPI_FAILURE_INVALID_BACKING_PAGE,
3768 };
3769
3770 static int avic_incomplete_ipi_interception(struct vcpu_svm *svm)
3771 {
3772 u32 icrh = svm->vmcb->control.exit_info_1 >> 32;
3773 u32 icrl = svm->vmcb->control.exit_info_1;
3774 u32 id = svm->vmcb->control.exit_info_2 >> 32;
3775 u32 index = svm->vmcb->control.exit_info_2 & 0xFF;
3776 struct kvm_lapic *apic = svm->vcpu.arch.apic;
3777
3778 trace_kvm_avic_incomplete_ipi(svm->vcpu.vcpu_id, icrh, icrl, id, index);
3779
3780 switch (id) {
3781 case AVIC_IPI_FAILURE_INVALID_INT_TYPE:
3782 /*
3783 * AVIC hardware handles the generation of
3784 * IPIs when the specified Message Type is Fixed
3785 * (also known as fixed delivery mode) and
3786 * the Trigger Mode is edge-triggered. The hardware
3787 * also supports self and broadcast delivery modes
3788 * specified via the Destination Shorthand(DSH)
3789 * field of the ICRL. Logical and physical APIC ID
3790 * formats are supported. All other IPI types cause
3791 * a #VMEXIT, which needs to emulated.
3792 */
3793 kvm_lapic_reg_write(apic, APIC_ICR2, icrh);
3794 kvm_lapic_reg_write(apic, APIC_ICR, icrl);
3795 break;
3796 case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING: {
3797 int i;
3798 struct kvm_vcpu *vcpu;
3799 struct kvm *kvm = svm->vcpu.kvm;
3800 struct kvm_lapic *apic = svm->vcpu.arch.apic;
3801
3802 /*
3803 * At this point, we expect that the AVIC HW has already
3804 * set the appropriate IRR bits on the valid target
3805 * vcpus. So, we just need to kick the appropriate vcpu.
3806 */
3807 kvm_for_each_vcpu(i, vcpu, kvm) {
3808 bool m = kvm_apic_match_dest(vcpu, apic,
3809 icrl & KVM_APIC_SHORT_MASK,
3810 GET_APIC_DEST_FIELD(icrh),
3811 icrl & KVM_APIC_DEST_MASK);
3812
3813 if (m && !avic_vcpu_is_running(vcpu))
3814 kvm_vcpu_wake_up(vcpu);
3815 }
3816 break;
3817 }
3818 case AVIC_IPI_FAILURE_INVALID_TARGET:
3819 break;
3820 case AVIC_IPI_FAILURE_INVALID_BACKING_PAGE:
3821 WARN_ONCE(1, "Invalid backing page\n");
3822 break;
3823 default:
3824 pr_err("Unknown IPI interception\n");
3825 }
3826
3827 return 1;
3828 }
3829
3830 static u32 *avic_get_logical_id_entry(struct kvm_vcpu *vcpu, u32 ldr, bool flat)
3831 {
3832 struct kvm_arch *vm_data = &vcpu->kvm->arch;
3833 int index;
3834 u32 *logical_apic_id_table;
3835 int dlid = GET_APIC_LOGICAL_ID(ldr);
3836
3837 if (!dlid)
3838 return NULL;
3839
3840 if (flat) { /* flat */
3841 index = ffs(dlid) - 1;
3842 if (index > 7)
3843 return NULL;
3844 } else { /* cluster */
3845 int cluster = (dlid & 0xf0) >> 4;
3846 int apic = ffs(dlid & 0x0f) - 1;
3847
3848 if ((apic < 0) || (apic > 7) ||
3849 (cluster >= 0xf))
3850 return NULL;
3851 index = (cluster << 2) + apic;
3852 }
3853
3854 logical_apic_id_table = (u32 *) page_address(vm_data->avic_logical_id_table_page);
3855
3856 return &logical_apic_id_table[index];
3857 }
3858
3859 static int avic_ldr_write(struct kvm_vcpu *vcpu, u8 g_physical_id, u32 ldr,
3860 bool valid)
3861 {
3862 bool flat;
3863 u32 *entry, new_entry;
3864
3865 flat = kvm_lapic_get_reg(vcpu->arch.apic, APIC_DFR) == APIC_DFR_FLAT;
3866 entry = avic_get_logical_id_entry(vcpu, ldr, flat);
3867 if (!entry)
3868 return -EINVAL;
3869
3870 new_entry = READ_ONCE(*entry);
3871 new_entry &= ~AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK;
3872 new_entry |= (g_physical_id & AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK);
3873 if (valid)
3874 new_entry |= AVIC_LOGICAL_ID_ENTRY_VALID_MASK;
3875 else
3876 new_entry &= ~AVIC_LOGICAL_ID_ENTRY_VALID_MASK;
3877 WRITE_ONCE(*entry, new_entry);
3878
3879 return 0;
3880 }
3881
3882 static int avic_handle_ldr_update(struct kvm_vcpu *vcpu)
3883 {
3884 int ret;
3885 struct vcpu_svm *svm = to_svm(vcpu);
3886 u32 ldr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LDR);
3887
3888 if (!ldr)
3889 return 1;
3890
3891 ret = avic_ldr_write(vcpu, vcpu->vcpu_id, ldr, true);
3892 if (ret && svm->ldr_reg) {
3893 avic_ldr_write(vcpu, 0, svm->ldr_reg, false);
3894 svm->ldr_reg = 0;
3895 } else {
3896 svm->ldr_reg = ldr;
3897 }
3898 return ret;
3899 }
3900
3901 static int avic_handle_apic_id_update(struct kvm_vcpu *vcpu)
3902 {
3903 u64 *old, *new;
3904 struct vcpu_svm *svm = to_svm(vcpu);
3905 u32 apic_id_reg = kvm_lapic_get_reg(vcpu->arch.apic, APIC_ID);
3906 u32 id = (apic_id_reg >> 24) & 0xff;
3907
3908 if (vcpu->vcpu_id == id)
3909 return 0;
3910
3911 old = avic_get_physical_id_entry(vcpu, vcpu->vcpu_id);
3912 new = avic_get_physical_id_entry(vcpu, id);
3913 if (!new || !old)
3914 return 1;
3915
3916 /* We need to move physical_id_entry to new offset */
3917 *new = *old;
3918 *old = 0ULL;
3919 to_svm(vcpu)->avic_physical_id_cache = new;
3920
3921 /*
3922 * Also update the guest physical APIC ID in the logical
3923 * APIC ID table entry if already setup the LDR.
3924 */
3925 if (svm->ldr_reg)
3926 avic_handle_ldr_update(vcpu);
3927
3928 return 0;
3929 }
3930
3931 static int avic_handle_dfr_update(struct kvm_vcpu *vcpu)
3932 {
3933 struct vcpu_svm *svm = to_svm(vcpu);
3934 struct kvm_arch *vm_data = &vcpu->kvm->arch;
3935 u32 dfr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_DFR);
3936 u32 mod = (dfr >> 28) & 0xf;
3937
3938 /*
3939 * We assume that all local APICs are using the same type.
3940 * If this changes, we need to flush the AVIC logical
3941 * APID id table.
3942 */
3943 if (vm_data->ldr_mode == mod)
3944 return 0;
3945
3946 clear_page(page_address(vm_data->avic_logical_id_table_page));
3947 vm_data->ldr_mode = mod;
3948
3949 if (svm->ldr_reg)
3950 avic_handle_ldr_update(vcpu);
3951 return 0;
3952 }
3953
3954 static int avic_unaccel_trap_write(struct vcpu_svm *svm)
3955 {
3956 struct kvm_lapic *apic = svm->vcpu.arch.apic;
3957 u32 offset = svm->vmcb->control.exit_info_1 &
3958 AVIC_UNACCEL_ACCESS_OFFSET_MASK;
3959
3960 switch (offset) {
3961 case APIC_ID:
3962 if (avic_handle_apic_id_update(&svm->vcpu))
3963 return 0;
3964 break;
3965 case APIC_LDR:
3966 if (avic_handle_ldr_update(&svm->vcpu))
3967 return 0;
3968 break;
3969 case APIC_DFR:
3970 avic_handle_dfr_update(&svm->vcpu);
3971 break;
3972 default:
3973 break;
3974 }
3975
3976 kvm_lapic_reg_write(apic, offset, kvm_lapic_get_reg(apic, offset));
3977
3978 return 1;
3979 }
3980
3981 static bool is_avic_unaccelerated_access_trap(u32 offset)
3982 {
3983 bool ret = false;
3984
3985 switch (offset) {
3986 case APIC_ID:
3987 case APIC_EOI:
3988 case APIC_RRR:
3989 case APIC_LDR:
3990 case APIC_DFR:
3991 case APIC_SPIV:
3992 case APIC_ESR:
3993 case APIC_ICR:
3994 case APIC_LVTT:
3995 case APIC_LVTTHMR:
3996 case APIC_LVTPC:
3997 case APIC_LVT0:
3998 case APIC_LVT1:
3999 case APIC_LVTERR:
4000 case APIC_TMICT:
4001 case APIC_TDCR:
4002 ret = true;
4003 break;
4004 default:
4005 break;
4006 }
4007 return ret;
4008 }
4009
4010 static int avic_unaccelerated_access_interception(struct vcpu_svm *svm)
4011 {
4012 int ret = 0;
4013 u32 offset = svm->vmcb->control.exit_info_1 &
4014 AVIC_UNACCEL_ACCESS_OFFSET_MASK;
4015 u32 vector = svm->vmcb->control.exit_info_2 &
4016 AVIC_UNACCEL_ACCESS_VECTOR_MASK;
4017 bool write = (svm->vmcb->control.exit_info_1 >> 32) &
4018 AVIC_UNACCEL_ACCESS_WRITE_MASK;
4019 bool trap = is_avic_unaccelerated_access_trap(offset);
4020
4021 trace_kvm_avic_unaccelerated_access(svm->vcpu.vcpu_id, offset,
4022 trap, write, vector);
4023 if (trap) {
4024 /* Handling Trap */
4025 WARN_ONCE(!write, "svm: Handling trap read.\n");
4026 ret = avic_unaccel_trap_write(svm);
4027 } else {
4028 /* Handling Fault */
4029 ret = (emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE);
4030 }
4031
4032 return ret;
4033 }
4034
4035 static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
4036 [SVM_EXIT_READ_CR0] = cr_interception,
4037 [SVM_EXIT_READ_CR3] = cr_interception,
4038 [SVM_EXIT_READ_CR4] = cr_interception,
4039 [SVM_EXIT_READ_CR8] = cr_interception,
4040 [SVM_EXIT_CR0_SEL_WRITE] = cr_interception,
4041 [SVM_EXIT_WRITE_CR0] = cr_interception,
4042 [SVM_EXIT_WRITE_CR3] = cr_interception,
4043 [SVM_EXIT_WRITE_CR4] = cr_interception,
4044 [SVM_EXIT_WRITE_CR8] = cr8_write_interception,
4045 [SVM_EXIT_READ_DR0] = dr_interception,
4046 [SVM_EXIT_READ_DR1] = dr_interception,
4047 [SVM_EXIT_READ_DR2] = dr_interception,
4048 [SVM_EXIT_READ_DR3] = dr_interception,
4049 [SVM_EXIT_READ_DR4] = dr_interception,
4050 [SVM_EXIT_READ_DR5] = dr_interception,
4051 [SVM_EXIT_READ_DR6] = dr_interception,
4052 [SVM_EXIT_READ_DR7] = dr_interception,
4053 [SVM_EXIT_WRITE_DR0] = dr_interception,
4054 [SVM_EXIT_WRITE_DR1] = dr_interception,
4055 [SVM_EXIT_WRITE_DR2] = dr_interception,
4056 [SVM_EXIT_WRITE_DR3] = dr_interception,
4057 [SVM_EXIT_WRITE_DR4] = dr_interception,
4058 [SVM_EXIT_WRITE_DR5] = dr_interception,
4059 [SVM_EXIT_WRITE_DR6] = dr_interception,
4060 [SVM_EXIT_WRITE_DR7] = dr_interception,
4061 [SVM_EXIT_EXCP_BASE + DB_VECTOR] = db_interception,
4062 [SVM_EXIT_EXCP_BASE + BP_VECTOR] = bp_interception,
4063 [SVM_EXIT_EXCP_BASE + UD_VECTOR] = ud_interception,
4064 [SVM_EXIT_EXCP_BASE + PF_VECTOR] = pf_interception,
4065 [SVM_EXIT_EXCP_BASE + MC_VECTOR] = mc_interception,
4066 [SVM_EXIT_EXCP_BASE + AC_VECTOR] = ac_interception,
4067 [SVM_EXIT_INTR] = intr_interception,
4068 [SVM_EXIT_NMI] = nmi_interception,
4069 [SVM_EXIT_SMI] = nop_on_interception,
4070 [SVM_EXIT_INIT] = nop_on_interception,
4071 [SVM_EXIT_VINTR] = interrupt_window_interception,
4072 [SVM_EXIT_RDPMC] = rdpmc_interception,
4073 [SVM_EXIT_CPUID] = cpuid_interception,
4074 [SVM_EXIT_IRET] = iret_interception,
4075 [SVM_EXIT_INVD] = emulate_on_interception,
4076 [SVM_EXIT_PAUSE] = pause_interception,
4077 [SVM_EXIT_HLT] = halt_interception,
4078 [SVM_EXIT_INVLPG] = invlpg_interception,
4079 [SVM_EXIT_INVLPGA] = invlpga_interception,
4080 [SVM_EXIT_IOIO] = io_interception,
4081 [SVM_EXIT_MSR] = msr_interception,
4082 [SVM_EXIT_TASK_SWITCH] = task_switch_interception,
4083 [SVM_EXIT_SHUTDOWN] = shutdown_interception,
4084 [SVM_EXIT_VMRUN] = vmrun_interception,
4085 [SVM_EXIT_VMMCALL] = vmmcall_interception,
4086 [SVM_EXIT_VMLOAD] = vmload_interception,
4087 [SVM_EXIT_VMSAVE] = vmsave_interception,
4088 [SVM_EXIT_STGI] = stgi_interception,
4089 [SVM_EXIT_CLGI] = clgi_interception,
4090 [SVM_EXIT_SKINIT] = skinit_interception,
4091 [SVM_EXIT_WBINVD] = wbinvd_interception,
4092 [SVM_EXIT_MONITOR] = monitor_interception,
4093 [SVM_EXIT_MWAIT] = mwait_interception,
4094 [SVM_EXIT_XSETBV] = xsetbv_interception,
4095 [SVM_EXIT_NPF] = pf_interception,
4096 [SVM_EXIT_RSM] = emulate_on_interception,
4097 [SVM_EXIT_AVIC_INCOMPLETE_IPI] = avic_incomplete_ipi_interception,
4098 [SVM_EXIT_AVIC_UNACCELERATED_ACCESS] = avic_unaccelerated_access_interception,
4099 };
4100
4101 static void dump_vmcb(struct kvm_vcpu *vcpu)
4102 {
4103 struct vcpu_svm *svm = to_svm(vcpu);
4104 struct vmcb_control_area *control = &svm->vmcb->control;
4105 struct vmcb_save_area *save = &svm->vmcb->save;
4106
4107 pr_err("VMCB Control Area:\n");
4108 pr_err("%-20s%04x\n", "cr_read:", control->intercept_cr & 0xffff);
4109 pr_err("%-20s%04x\n", "cr_write:", control->intercept_cr >> 16);
4110 pr_err("%-20s%04x\n", "dr_read:", control->intercept_dr & 0xffff);
4111 pr_err("%-20s%04x\n", "dr_write:", control->intercept_dr >> 16);
4112 pr_err("%-20s%08x\n", "exceptions:", control->intercept_exceptions);
4113 pr_err("%-20s%016llx\n", "intercepts:", control->intercept);
4114 pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
4115 pr_err("%-20s%016llx\n", "iopm_base_pa:", control->iopm_base_pa);
4116 pr_err("%-20s%016llx\n", "msrpm_base_pa:", control->msrpm_base_pa);
4117 pr_err("%-20s%016llx\n", "tsc_offset:", control->tsc_offset);
4118 pr_err("%-20s%d\n", "asid:", control->asid);
4119 pr_err("%-20s%d\n", "tlb_ctl:", control->tlb_ctl);
4120 pr_err("%-20s%08x\n", "int_ctl:", control->int_ctl);
4121 pr_err("%-20s%08x\n", "int_vector:", control->int_vector);
4122 pr_err("%-20s%08x\n", "int_state:", control->int_state);
4123 pr_err("%-20s%08x\n", "exit_code:", control->exit_code);
4124 pr_err("%-20s%016llx\n", "exit_info1:", control->exit_info_1);
4125 pr_err("%-20s%016llx\n", "exit_info2:", control->exit_info_2);
4126 pr_err("%-20s%08x\n", "exit_int_info:", control->exit_int_info);
4127 pr_err("%-20s%08x\n", "exit_int_info_err:", control->exit_int_info_err);
4128 pr_err("%-20s%lld\n", "nested_ctl:", control->nested_ctl);
4129 pr_err("%-20s%016llx\n", "nested_cr3:", control->nested_cr3);
4130 pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
4131 pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
4132 pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
4133 pr_err("%-20s%lld\n", "virt_ext:", control->virt_ext);
4134 pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
4135 pr_err("%-20s%016llx\n", "avic_backing_page:", control->avic_backing_page);
4136 pr_err("%-20s%016llx\n", "avic_logical_id:", control->avic_logical_id);
4137 pr_err("%-20s%016llx\n", "avic_physical_id:", control->avic_physical_id);
4138 pr_err("VMCB State Save Area:\n");
4139 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4140 "es:",
4141 save->es.selector, save->es.attrib,
4142 save->es.limit, save->es.base);
4143 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4144 "cs:",
4145 save->cs.selector, save->cs.attrib,
4146 save->cs.limit, save->cs.base);
4147 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4148 "ss:",
4149 save->ss.selector, save->ss.attrib,
4150 save->ss.limit, save->ss.base);
4151 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4152 "ds:",
4153 save->ds.selector, save->ds.attrib,
4154 save->ds.limit, save->ds.base);
4155 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4156 "fs:",
4157 save->fs.selector, save->fs.attrib,
4158 save->fs.limit, save->fs.base);
4159 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4160 "gs:",
4161 save->gs.selector, save->gs.attrib,
4162 save->gs.limit, save->gs.base);
4163 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4164 "gdtr:",
4165 save->gdtr.selector, save->gdtr.attrib,
4166 save->gdtr.limit, save->gdtr.base);
4167 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4168 "ldtr:",
4169 save->ldtr.selector, save->ldtr.attrib,
4170 save->ldtr.limit, save->ldtr.base);
4171 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4172 "idtr:",
4173 save->idtr.selector, save->idtr.attrib,
4174 save->idtr.limit, save->idtr.base);
4175 pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
4176 "tr:",
4177 save->tr.selector, save->tr.attrib,
4178 save->tr.limit, save->tr.base);
4179 pr_err("cpl: %d efer: %016llx\n",
4180 save->cpl, save->efer);
4181 pr_err("%-15s %016llx %-13s %016llx\n",
4182 "cr0:", save->cr0, "cr2:", save->cr2);
4183 pr_err("%-15s %016llx %-13s %016llx\n",
4184 "cr3:", save->cr3, "cr4:", save->cr4);
4185 pr_err("%-15s %016llx %-13s %016llx\n",
4186 "dr6:", save->dr6, "dr7:", save->dr7);
4187 pr_err("%-15s %016llx %-13s %016llx\n",
4188 "rip:", save->rip, "rflags:", save->rflags);
4189 pr_err("%-15s %016llx %-13s %016llx\n",
4190 "rsp:", save->rsp, "rax:", save->rax);
4191 pr_err("%-15s %016llx %-13s %016llx\n",
4192 "star:", save->star, "lstar:", save->lstar);
4193 pr_err("%-15s %016llx %-13s %016llx\n",
4194 "cstar:", save->cstar, "sfmask:", save->sfmask);
4195 pr_err("%-15s %016llx %-13s %016llx\n",
4196 "kernel_gs_base:", save->kernel_gs_base,
4197 "sysenter_cs:", save->sysenter_cs);
4198 pr_err("%-15s %016llx %-13s %016llx\n",
4199 "sysenter_esp:", save->sysenter_esp,
4200 "sysenter_eip:", save->sysenter_eip);
4201 pr_err("%-15s %016llx %-13s %016llx\n",
4202 "gpat:", save->g_pat, "dbgctl:", save->dbgctl);
4203 pr_err("%-15s %016llx %-13s %016llx\n",
4204 "br_from:", save->br_from, "br_to:", save->br_to);
4205 pr_err("%-15s %016llx %-13s %016llx\n",
4206 "excp_from:", save->last_excp_from,
4207 "excp_to:", save->last_excp_to);
4208 }
4209
4210 static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
4211 {
4212 struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
4213
4214 *info1 = control->exit_info_1;
4215 *info2 = control->exit_info_2;
4216 }
4217
4218 static int handle_exit(struct kvm_vcpu *vcpu)
4219 {
4220 struct vcpu_svm *svm = to_svm(vcpu);
4221 struct kvm_run *kvm_run = vcpu->run;
4222 u32 exit_code = svm->vmcb->control.exit_code;
4223
4224 trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
4225
4226 vcpu->arch.gpa_available = (exit_code == SVM_EXIT_NPF);
4227
4228 if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
4229 vcpu->arch.cr0 = svm->vmcb->save.cr0;
4230 if (npt_enabled)
4231 vcpu->arch.cr3 = svm->vmcb->save.cr3;
4232
4233 if (unlikely(svm->nested.exit_required)) {
4234 nested_svm_vmexit(svm);
4235 svm->nested.exit_required = false;
4236
4237 return 1;
4238 }
4239
4240 if (is_guest_mode(vcpu)) {
4241 int vmexit;
4242
4243 trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
4244 svm->vmcb->control.exit_info_1,
4245 svm->vmcb->control.exit_info_2,
4246 svm->vmcb->control.exit_int_info,
4247 svm->vmcb->control.exit_int_info_err,
4248 KVM_ISA_SVM);
4249
4250 vmexit = nested_svm_exit_special(svm);
4251
4252 if (vmexit == NESTED_EXIT_CONTINUE)
4253 vmexit = nested_svm_exit_handled(svm);
4254
4255 if (vmexit == NESTED_EXIT_DONE)
4256 return 1;
4257 }
4258
4259 svm_complete_interrupts(svm);
4260
4261 if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
4262 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
4263 kvm_run->fail_entry.hardware_entry_failure_reason
4264 = svm->vmcb->control.exit_code;
4265 pr_err("KVM: FAILED VMRUN WITH VMCB:\n");
4266 dump_vmcb(vcpu);
4267 return 0;
4268 }
4269
4270 if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
4271 exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
4272 exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
4273 exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
4274 printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
4275 "exit_code 0x%x\n",
4276 __func__, svm->vmcb->control.exit_int_info,
4277 exit_code);
4278
4279 if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
4280 || !svm_exit_handlers[exit_code]) {
4281 WARN_ONCE(1, "svm: unexpected exit reason 0x%x\n", exit_code);
4282 kvm_queue_exception(vcpu, UD_VECTOR);
4283 return 1;
4284 }
4285
4286 return svm_exit_handlers[exit_code](svm);
4287 }
4288
4289 static void reload_tss(struct kvm_vcpu *vcpu)
4290 {
4291 int cpu = raw_smp_processor_id();
4292
4293 struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
4294 sd->tss_desc->type = 9; /* available 32/64-bit TSS */
4295 load_TR_desc();
4296 }
4297
4298 static void pre_svm_run(struct vcpu_svm *svm)
4299 {
4300 int cpu = raw_smp_processor_id();
4301
4302 struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
4303
4304 /* FIXME: handle wraparound of asid_generation */
4305 if (svm->asid_generation != sd->asid_generation)
4306 new_asid(svm, sd);
4307 }
4308
4309 static void svm_inject_nmi(struct kvm_vcpu *vcpu)
4310 {
4311 struct vcpu_svm *svm = to_svm(vcpu);
4312
4313 svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
4314 vcpu->arch.hflags |= HF_NMI_MASK;
4315 set_intercept(svm, INTERCEPT_IRET);
4316 ++vcpu->stat.nmi_injections;
4317 }
4318
4319 static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
4320 {
4321 struct vmcb_control_area *control;
4322
4323 /* The following fields are ignored when AVIC is enabled */
4324 control = &svm->vmcb->control;
4325 control->int_vector = irq;
4326 control->int_ctl &= ~V_INTR_PRIO_MASK;
4327 control->int_ctl |= V_IRQ_MASK |
4328 ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
4329 mark_dirty(svm->vmcb, VMCB_INTR);
4330 }
4331
4332 static void svm_set_irq(struct kvm_vcpu *vcpu)
4333 {
4334 struct vcpu_svm *svm = to_svm(vcpu);
4335
4336 BUG_ON(!(gif_set(svm)));
4337
4338 trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
4339 ++vcpu->stat.irq_injections;
4340
4341 svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
4342 SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
4343 }
4344
4345 static inline bool svm_nested_virtualize_tpr(struct kvm_vcpu *vcpu)
4346 {
4347 return is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK);
4348 }
4349
4350 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
4351 {
4352 struct vcpu_svm *svm = to_svm(vcpu);
4353
4354 if (svm_nested_virtualize_tpr(vcpu) ||
4355 kvm_vcpu_apicv_active(vcpu))
4356 return;
4357
4358 clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
4359
4360 if (irr == -1)
4361 return;
4362
4363 if (tpr >= irr)
4364 set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
4365 }
4366
4367 static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
4368 {
4369 return;
4370 }
4371
4372 static bool svm_get_enable_apicv(void)
4373 {
4374 return avic;
4375 }
4376
4377 static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
4378 {
4379 }
4380
4381 static void svm_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
4382 {
4383 }
4384
4385 /* Note: Currently only used by Hyper-V. */
4386 static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
4387 {
4388 struct vcpu_svm *svm = to_svm(vcpu);
4389 struct vmcb *vmcb = svm->vmcb;
4390
4391 if (!avic)
4392 return;
4393
4394 vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
4395 mark_dirty(vmcb, VMCB_INTR);
4396 }
4397
4398 static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
4399 {
4400 return;
4401 }
4402
4403 static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
4404 {
4405 kvm_lapic_set_irr(vec, vcpu->arch.apic);
4406 smp_mb__after_atomic();
4407
4408 if (avic_vcpu_is_running(vcpu))
4409 wrmsrl(SVM_AVIC_DOORBELL,
4410 kvm_cpu_get_apicid(vcpu->cpu));
4411 else
4412 kvm_vcpu_wake_up(vcpu);
4413 }
4414
4415 static void svm_ir_list_del(struct vcpu_svm *svm, struct amd_iommu_pi_data *pi)
4416 {
4417 unsigned long flags;
4418 struct amd_svm_iommu_ir *cur;
4419
4420 spin_lock_irqsave(&svm->ir_list_lock, flags);
4421 list_for_each_entry(cur, &svm->ir_list, node) {
4422 if (cur->data != pi->ir_data)
4423 continue;
4424 list_del(&cur->node);
4425 kfree(cur);
4426 break;
4427 }
4428 spin_unlock_irqrestore(&svm->ir_list_lock, flags);
4429 }
4430
4431 static int svm_ir_list_add(struct vcpu_svm *svm, struct amd_iommu_pi_data *pi)
4432 {
4433 int ret = 0;
4434 unsigned long flags;
4435 struct amd_svm_iommu_ir *ir;
4436
4437 /**
4438 * In some cases, the existing irte is updaed and re-set,
4439 * so we need to check here if it's already been * added
4440 * to the ir_list.
4441 */
4442 if (pi->ir_data && (pi->prev_ga_tag != 0)) {
4443 struct kvm *kvm = svm->vcpu.kvm;
4444 u32 vcpu_id = AVIC_GATAG_TO_VCPUID(pi->prev_ga_tag);
4445 struct kvm_vcpu *prev_vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
4446 struct vcpu_svm *prev_svm;
4447
4448 if (!prev_vcpu) {
4449 ret = -EINVAL;
4450 goto out;
4451 }
4452
4453 prev_svm = to_svm(prev_vcpu);
4454 svm_ir_list_del(prev_svm, pi);
4455 }
4456
4457 /**
4458 * Allocating new amd_iommu_pi_data, which will get
4459 * add to the per-vcpu ir_list.
4460 */
4461 ir = kzalloc(sizeof(struct amd_svm_iommu_ir), GFP_KERNEL);
4462 if (!ir) {
4463 ret = -ENOMEM;
4464 goto out;
4465 }
4466 ir->data = pi->ir_data;
4467
4468 spin_lock_irqsave(&svm->ir_list_lock, flags);
4469 list_add(&ir->node, &svm->ir_list);
4470 spin_unlock_irqrestore(&svm->ir_list_lock, flags);
4471 out:
4472 return ret;
4473 }
4474
4475 /**
4476 * Note:
4477 * The HW cannot support posting multicast/broadcast
4478 * interrupts to a vCPU. So, we still use legacy interrupt
4479 * remapping for these kind of interrupts.
4480 *
4481 * For lowest-priority interrupts, we only support
4482 * those with single CPU as the destination, e.g. user
4483 * configures the interrupts via /proc/irq or uses
4484 * irqbalance to make the interrupts single-CPU.
4485 */
4486 static int
4487 get_pi_vcpu_info(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
4488 struct vcpu_data *vcpu_info, struct vcpu_svm **svm)
4489 {
4490 struct kvm_lapic_irq irq;
4491 struct kvm_vcpu *vcpu = NULL;
4492
4493 kvm_set_msi_irq(kvm, e, &irq);
4494
4495 if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu)) {
4496 pr_debug("SVM: %s: use legacy intr remap mode for irq %u\n",
4497 __func__, irq.vector);
4498 return -1;
4499 }
4500
4501 pr_debug("SVM: %s: use GA mode for irq %u\n", __func__,
4502 irq.vector);
4503 *svm = to_svm(vcpu);
4504 vcpu_info->pi_desc_addr = page_to_phys((*svm)->avic_backing_page);
4505 vcpu_info->vector = irq.vector;
4506
4507 return 0;
4508 }
4509
4510 /*
4511 * svm_update_pi_irte - set IRTE for Posted-Interrupts
4512 *
4513 * @kvm: kvm
4514 * @host_irq: host irq of the interrupt
4515 * @guest_irq: gsi of the interrupt
4516 * @set: set or unset PI
4517 * returns 0 on success, < 0 on failure
4518 */
4519 static int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
4520 uint32_t guest_irq, bool set)
4521 {
4522 struct kvm_kernel_irq_routing_entry *e;
4523 struct kvm_irq_routing_table *irq_rt;
4524 int idx, ret = -EINVAL;
4525
4526 if (!kvm_arch_has_assigned_device(kvm) ||
4527 !irq_remapping_cap(IRQ_POSTING_CAP))
4528 return 0;
4529
4530 pr_debug("SVM: %s: host_irq=%#x, guest_irq=%#x, set=%#x\n",
4531 __func__, host_irq, guest_irq, set);
4532
4533 idx = srcu_read_lock(&kvm->irq_srcu);
4534 irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
4535 WARN_ON(guest_irq >= irq_rt->nr_rt_entries);
4536
4537 hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) {
4538 struct vcpu_data vcpu_info;
4539 struct vcpu_svm *svm = NULL;
4540
4541 if (e->type != KVM_IRQ_ROUTING_MSI)
4542 continue;
4543
4544 /**
4545 * Here, we setup with legacy mode in the following cases:
4546 * 1. When cannot target interrupt to a specific vcpu.
4547 * 2. Unsetting posted interrupt.
4548 * 3. APIC virtialization is disabled for the vcpu.
4549 */
4550 if (!get_pi_vcpu_info(kvm, e, &vcpu_info, &svm) && set &&
4551 kvm_vcpu_apicv_active(&svm->vcpu)) {
4552 struct amd_iommu_pi_data pi;
4553
4554 /* Try to enable guest_mode in IRTE */
4555 pi.base = page_to_phys(svm->avic_backing_page) & AVIC_HPA_MASK;
4556 pi.ga_tag = AVIC_GATAG(kvm->arch.avic_vm_id,
4557 svm->vcpu.vcpu_id);
4558 pi.is_guest_mode = true;
4559 pi.vcpu_data = &vcpu_info;
4560 ret = irq_set_vcpu_affinity(host_irq, &pi);
4561
4562 /**
4563 * Here, we successfully setting up vcpu affinity in
4564 * IOMMU guest mode. Now, we need to store the posted
4565 * interrupt information in a per-vcpu ir_list so that
4566 * we can reference to them directly when we update vcpu
4567 * scheduling information in IOMMU irte.
4568 */
4569 if (!ret && pi.is_guest_mode)
4570 svm_ir_list_add(svm, &pi);
4571 } else {
4572 /* Use legacy mode in IRTE */
4573 struct amd_iommu_pi_data pi;
4574
4575 /**
4576 * Here, pi is used to:
4577 * - Tell IOMMU to use legacy mode for this interrupt.
4578 * - Retrieve ga_tag of prior interrupt remapping data.
4579 */
4580 pi.is_guest_mode = false;
4581 ret = irq_set_vcpu_affinity(host_irq, &pi);
4582
4583 /**
4584 * Check if the posted interrupt was previously
4585 * setup with the guest_mode by checking if the ga_tag
4586 * was cached. If so, we need to clean up the per-vcpu
4587 * ir_list.
4588 */
4589 if (!ret && pi.prev_ga_tag) {
4590 int id = AVIC_GATAG_TO_VCPUID(pi.prev_ga_tag);
4591 struct kvm_vcpu *vcpu;
4592
4593 vcpu = kvm_get_vcpu_by_id(kvm, id);
4594 if (vcpu)
4595 svm_ir_list_del(to_svm(vcpu), &pi);
4596 }
4597 }
4598
4599 if (!ret && svm) {
4600 trace_kvm_pi_irte_update(svm->vcpu.vcpu_id,
4601 host_irq, e->gsi,
4602 vcpu_info.vector,
4603 vcpu_info.pi_desc_addr, set);
4604 }
4605
4606 if (ret < 0) {
4607 pr_err("%s: failed to update PI IRTE\n", __func__);
4608 goto out;
4609 }
4610 }
4611
4612 ret = 0;
4613 out:
4614 srcu_read_unlock(&kvm->irq_srcu, idx);
4615 return ret;
4616 }
4617
4618 static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
4619 {
4620 struct vcpu_svm *svm = to_svm(vcpu);
4621 struct vmcb *vmcb = svm->vmcb;
4622 int ret;
4623 ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
4624 !(svm->vcpu.arch.hflags & HF_NMI_MASK);
4625 ret = ret && gif_set(svm) && nested_svm_nmi(svm);
4626
4627 return ret;
4628 }
4629
4630 static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
4631 {
4632 struct vcpu_svm *svm = to_svm(vcpu);
4633
4634 return !!(svm->vcpu.arch.hflags & HF_NMI_MASK);
4635 }
4636
4637 static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
4638 {
4639 struct vcpu_svm *svm = to_svm(vcpu);
4640
4641 if (masked) {
4642 svm->vcpu.arch.hflags |= HF_NMI_MASK;
4643 set_intercept(svm, INTERCEPT_IRET);
4644 } else {
4645 svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
4646 clr_intercept(svm, INTERCEPT_IRET);
4647 }
4648 }
4649
4650 static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
4651 {
4652 struct vcpu_svm *svm = to_svm(vcpu);
4653 struct vmcb *vmcb = svm->vmcb;
4654 int ret;
4655
4656 if (!gif_set(svm) ||
4657 (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
4658 return 0;
4659
4660 ret = !!(kvm_get_rflags(vcpu) & X86_EFLAGS_IF);
4661
4662 if (is_guest_mode(vcpu))
4663 return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);
4664
4665 return ret;
4666 }
4667
4668 static void enable_irq_window(struct kvm_vcpu *vcpu)
4669 {
4670 struct vcpu_svm *svm = to_svm(vcpu);
4671
4672 if (kvm_vcpu_apicv_active(vcpu))
4673 return;
4674
4675 /*
4676 * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
4677 * 1, because that's a separate STGI/VMRUN intercept. The next time we
4678 * get that intercept, this function will be called again though and
4679 * we'll get the vintr intercept.
4680 */
4681 if (gif_set(svm) && nested_svm_intr(svm)) {
4682 svm_set_vintr(svm);
4683 svm_inject_irq(svm, 0x0);
4684 }
4685 }
4686
4687 static void enable_nmi_window(struct kvm_vcpu *vcpu)
4688 {
4689 struct vcpu_svm *svm = to_svm(vcpu);
4690
4691 if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
4692 == HF_NMI_MASK)
4693 return; /* IRET will cause a vm exit */
4694
4695 if ((svm->vcpu.arch.hflags & HF_GIF_MASK) == 0)
4696 return; /* STGI will cause a vm exit */
4697
4698 if (svm->nested.exit_required)
4699 return; /* we're not going to run the guest yet */
4700
4701 /*
4702 * Something prevents NMI from been injected. Single step over possible
4703 * problem (IRET or exception injection or interrupt shadow)
4704 */
4705 svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu);
4706 svm->nmi_singlestep = true;
4707 svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
4708 }
4709
4710 static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
4711 {
4712 return 0;
4713 }
4714
4715 static void svm_flush_tlb(struct kvm_vcpu *vcpu)
4716 {
4717 struct vcpu_svm *svm = to_svm(vcpu);
4718
4719 if (static_cpu_has(X86_FEATURE_FLUSHBYASID))
4720 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
4721 else
4722 svm->asid_generation--;
4723 }
4724
4725 static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
4726 {
4727 }
4728
4729 static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
4730 {
4731 struct vcpu_svm *svm = to_svm(vcpu);
4732
4733 if (svm_nested_virtualize_tpr(vcpu))
4734 return;
4735
4736 if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
4737 int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
4738 kvm_set_cr8(vcpu, cr8);
4739 }
4740 }
4741
4742 static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
4743 {
4744 struct vcpu_svm *svm = to_svm(vcpu);
4745 u64 cr8;
4746
4747 if (svm_nested_virtualize_tpr(vcpu) ||
4748 kvm_vcpu_apicv_active(vcpu))
4749 return;
4750
4751 cr8 = kvm_get_cr8(vcpu);
4752 svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
4753 svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
4754 }
4755
4756 static void svm_complete_interrupts(struct vcpu_svm *svm)
4757 {
4758 u8 vector;
4759 int type;
4760 u32 exitintinfo = svm->vmcb->control.exit_int_info;
4761 unsigned int3_injected = svm->int3_injected;
4762
4763 svm->int3_injected = 0;
4764
4765 /*
4766 * If we've made progress since setting HF_IRET_MASK, we've
4767 * executed an IRET and can allow NMI injection.
4768 */
4769 if ((svm->vcpu.arch.hflags & HF_IRET_MASK)
4770 && kvm_rip_read(&svm->vcpu) != svm->nmi_iret_rip) {
4771 svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
4772 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
4773 }
4774
4775 svm->vcpu.arch.nmi_injected = false;
4776 kvm_clear_exception_queue(&svm->vcpu);
4777 kvm_clear_interrupt_queue(&svm->vcpu);
4778
4779 if (!(exitintinfo & SVM_EXITINTINFO_VALID))
4780 return;
4781
4782 kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
4783
4784 vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
4785 type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;
4786
4787 switch (type) {
4788 case SVM_EXITINTINFO_TYPE_NMI:
4789 svm->vcpu.arch.nmi_injected = true;
4790 break;
4791 case SVM_EXITINTINFO_TYPE_EXEPT:
4792 /*
4793 * In case of software exceptions, do not reinject the vector,
4794 * but re-execute the instruction instead. Rewind RIP first
4795 * if we emulated INT3 before.
4796 */
4797 if (kvm_exception_is_soft(vector)) {
4798 if (vector == BP_VECTOR && int3_injected &&
4799 kvm_is_linear_rip(&svm->vcpu, svm->int3_rip))
4800 kvm_rip_write(&svm->vcpu,
4801 kvm_rip_read(&svm->vcpu) -
4802 int3_injected);
4803 break;
4804 }
4805 if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
4806 u32 err = svm->vmcb->control.exit_int_info_err;
4807 kvm_requeue_exception_e(&svm->vcpu, vector, err);
4808
4809 } else
4810 kvm_requeue_exception(&svm->vcpu, vector);
4811 break;
4812 case SVM_EXITINTINFO_TYPE_INTR:
4813 kvm_queue_interrupt(&svm->vcpu, vector, false);
4814 break;
4815 default:
4816 break;
4817 }
4818 }
4819
4820 static void svm_cancel_injection(struct kvm_vcpu *vcpu)
4821 {
4822 struct vcpu_svm *svm = to_svm(vcpu);
4823 struct vmcb_control_area *control = &svm->vmcb->control;
4824
4825 control->exit_int_info = control->event_inj;
4826 control->exit_int_info_err = control->event_inj_err;
4827 control->event_inj = 0;
4828 svm_complete_interrupts(svm);
4829 }
4830
4831 static void svm_vcpu_run(struct kvm_vcpu *vcpu)
4832 {
4833 struct vcpu_svm *svm = to_svm(vcpu);
4834
4835 svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
4836 svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
4837 svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
4838
4839 /*
4840 * A vmexit emulation is required before the vcpu can be executed
4841 * again.
4842 */
4843 if (unlikely(svm->nested.exit_required))
4844 return;
4845
4846 /*
4847 * Disable singlestep if we're injecting an interrupt/exception.
4848 * We don't want our modified rflags to be pushed on the stack where
4849 * we might not be able to easily reset them if we disabled NMI
4850 * singlestep later.
4851 */
4852 if (svm->nmi_singlestep && svm->vmcb->control.event_inj) {
4853 /*
4854 * Event injection happens before external interrupts cause a
4855 * vmexit and interrupts are disabled here, so smp_send_reschedule
4856 * is enough to force an immediate vmexit.
4857 */
4858 disable_nmi_singlestep(svm);
4859 smp_send_reschedule(vcpu->cpu);
4860 }
4861
4862 pre_svm_run(svm);
4863
4864 sync_lapic_to_cr8(vcpu);
4865
4866 svm->vmcb->save.cr2 = vcpu->arch.cr2;
4867
4868 clgi();
4869
4870 local_irq_enable();
4871
4872 asm volatile (
4873 "push %%" _ASM_BP "; \n\t"
4874 "mov %c[rbx](%[svm]), %%" _ASM_BX " \n\t"
4875 "mov %c[rcx](%[svm]), %%" _ASM_CX " \n\t"
4876 "mov %c[rdx](%[svm]), %%" _ASM_DX " \n\t"
4877 "mov %c[rsi](%[svm]), %%" _ASM_SI " \n\t"
4878 "mov %c[rdi](%[svm]), %%" _ASM_DI " \n\t"
4879 "mov %c[rbp](%[svm]), %%" _ASM_BP " \n\t"
4880 #ifdef CONFIG_X86_64
4881 "mov %c[r8](%[svm]), %%r8 \n\t"
4882 "mov %c[r9](%[svm]), %%r9 \n\t"
4883 "mov %c[r10](%[svm]), %%r10 \n\t"
4884 "mov %c[r11](%[svm]), %%r11 \n\t"
4885 "mov %c[r12](%[svm]), %%r12 \n\t"
4886 "mov %c[r13](%[svm]), %%r13 \n\t"
4887 "mov %c[r14](%[svm]), %%r14 \n\t"
4888 "mov %c[r15](%[svm]), %%r15 \n\t"
4889 #endif
4890
4891 /* Enter guest mode */
4892 "push %%" _ASM_AX " \n\t"
4893 "mov %c[vmcb](%[svm]), %%" _ASM_AX " \n\t"
4894 __ex(SVM_VMLOAD) "\n\t"
4895 __ex(SVM_VMRUN) "\n\t"
4896 __ex(SVM_VMSAVE) "\n\t"
4897 "pop %%" _ASM_AX " \n\t"
4898
4899 /* Save guest registers, load host registers */
4900 "mov %%" _ASM_BX ", %c[rbx](%[svm]) \n\t"
4901 "mov %%" _ASM_CX ", %c[rcx](%[svm]) \n\t"
4902 "mov %%" _ASM_DX ", %c[rdx](%[svm]) \n\t"
4903 "mov %%" _ASM_SI ", %c[rsi](%[svm]) \n\t"
4904 "mov %%" _ASM_DI ", %c[rdi](%[svm]) \n\t"
4905 "mov %%" _ASM_BP ", %c[rbp](%[svm]) \n\t"
4906 #ifdef CONFIG_X86_64
4907 "mov %%r8, %c[r8](%[svm]) \n\t"
4908 "mov %%r9, %c[r9](%[svm]) \n\t"
4909 "mov %%r10, %c[r10](%[svm]) \n\t"
4910 "mov %%r11, %c[r11](%[svm]) \n\t"
4911 "mov %%r12, %c[r12](%[svm]) \n\t"
4912 "mov %%r13, %c[r13](%[svm]) \n\t"
4913 "mov %%r14, %c[r14](%[svm]) \n\t"
4914 "mov %%r15, %c[r15](%[svm]) \n\t"
4915 #endif
4916 "pop %%" _ASM_BP
4917 :
4918 : [svm]"a"(svm),
4919 [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
4920 [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
4921 [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
4922 [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
4923 [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
4924 [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
4925 [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
4926 #ifdef CONFIG_X86_64
4927 , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
4928 [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
4929 [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
4930 [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
4931 [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
4932 [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
4933 [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
4934 [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
4935 #endif
4936 : "cc", "memory"
4937 #ifdef CONFIG_X86_64
4938 , "rbx", "rcx", "rdx", "rsi", "rdi"
4939 , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
4940 #else
4941 , "ebx", "ecx", "edx", "esi", "edi"
4942 #endif
4943 );
4944
4945 #ifdef CONFIG_X86_64
4946 wrmsrl(MSR_GS_BASE, svm->host.gs_base);
4947 #else
4948 loadsegment(fs, svm->host.fs);
4949 #ifndef CONFIG_X86_32_LAZY_GS
4950 loadsegment(gs, svm->host.gs);
4951 #endif
4952 #endif
4953
4954 reload_tss(vcpu);
4955
4956 local_irq_disable();
4957
4958 vcpu->arch.cr2 = svm->vmcb->save.cr2;
4959 vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
4960 vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
4961 vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;
4962
4963 if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
4964 kvm_before_handle_nmi(&svm->vcpu);
4965
4966 stgi();
4967
4968 /* Any pending NMI will happen here */
4969
4970 if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
4971 kvm_after_handle_nmi(&svm->vcpu);
4972
4973 sync_cr8_to_lapic(vcpu);
4974
4975 svm->next_rip = 0;
4976
4977 svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
4978
4979 /* if exit due to PF check for async PF */
4980 if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
4981 svm->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
4982
4983 if (npt_enabled) {
4984 vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
4985 vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
4986 }
4987
4988 /*
4989 * We need to handle MC intercepts here before the vcpu has a chance to
4990 * change the physical cpu
4991 */
4992 if (unlikely(svm->vmcb->control.exit_code ==
4993 SVM_EXIT_EXCP_BASE + MC_VECTOR))
4994 svm_handle_mce(svm);
4995
4996 mark_all_clean(svm->vmcb);
4997 }
4998 STACK_FRAME_NON_STANDARD(svm_vcpu_run);
4999
5000 static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
5001 {
5002 struct vcpu_svm *svm = to_svm(vcpu);
5003
5004 svm->vmcb->save.cr3 = root;
5005 mark_dirty(svm->vmcb, VMCB_CR);
5006 svm_flush_tlb(vcpu);
5007 }
5008
5009 static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
5010 {
5011 struct vcpu_svm *svm = to_svm(vcpu);
5012
5013 svm->vmcb->control.nested_cr3 = root;
5014 mark_dirty(svm->vmcb, VMCB_NPT);
5015
5016 /* Also sync guest cr3 here in case we live migrate */
5017 svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
5018 mark_dirty(svm->vmcb, VMCB_CR);
5019
5020 svm_flush_tlb(vcpu);
5021 }
5022
5023 static int is_disabled(void)
5024 {
5025 u64 vm_cr;
5026
5027 rdmsrl(MSR_VM_CR, vm_cr);
5028 if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
5029 return 1;
5030
5031 return 0;
5032 }
5033
5034 static void
5035 svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
5036 {
5037 /*
5038 * Patch in the VMMCALL instruction:
5039 */
5040 hypercall[0] = 0x0f;
5041 hypercall[1] = 0x01;
5042 hypercall[2] = 0xd9;
5043 }
5044
5045 static void svm_check_processor_compat(void *rtn)
5046 {
5047 *(int *)rtn = 0;
5048 }
5049
5050 static bool svm_cpu_has_accelerated_tpr(void)
5051 {
5052 return false;
5053 }
5054
5055 static bool svm_has_high_real_mode_segbase(void)
5056 {
5057 return true;
5058 }
5059
5060 static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
5061 {
5062 return 0;
5063 }
5064
5065 static void svm_cpuid_update(struct kvm_vcpu *vcpu)
5066 {
5067 struct vcpu_svm *svm = to_svm(vcpu);
5068 struct kvm_cpuid_entry2 *entry;
5069
5070 /* Update nrips enabled cache */
5071 svm->nrips_enabled = !!guest_cpuid_has_nrips(&svm->vcpu);
5072
5073 if (!kvm_vcpu_apicv_active(vcpu))
5074 return;
5075
5076 entry = kvm_find_cpuid_entry(vcpu, 1, 0);
5077 if (entry)
5078 entry->ecx &= ~bit(X86_FEATURE_X2APIC);
5079 }
5080
5081 static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
5082 {
5083 switch (func) {
5084 case 0x1:
5085 if (avic)
5086 entry->ecx &= ~bit(X86_FEATURE_X2APIC);
5087 break;
5088 case 0x80000001:
5089 if (nested)
5090 entry->ecx |= (1 << 2); /* Set SVM bit */
5091 break;
5092 case 0x8000000A:
5093 entry->eax = 1; /* SVM revision 1 */
5094 entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
5095 ASID emulation to nested SVM */
5096 entry->ecx = 0; /* Reserved */
5097 entry->edx = 0; /* Per default do not support any
5098 additional features */
5099
5100 /* Support next_rip if host supports it */
5101 if (boot_cpu_has(X86_FEATURE_NRIPS))
5102 entry->edx |= SVM_FEATURE_NRIP;
5103
5104 /* Support NPT for the guest if enabled */
5105 if (npt_enabled)
5106 entry->edx |= SVM_FEATURE_NPT;
5107
5108 break;
5109 }
5110 }
5111
5112 static int svm_get_lpage_level(void)
5113 {
5114 return PT_PDPE_LEVEL;
5115 }
5116
5117 static bool svm_rdtscp_supported(void)
5118 {
5119 return boot_cpu_has(X86_FEATURE_RDTSCP);
5120 }
5121
5122 static bool svm_invpcid_supported(void)
5123 {
5124 return false;
5125 }
5126
5127 static bool svm_mpx_supported(void)
5128 {
5129 return false;
5130 }
5131
5132 static bool svm_xsaves_supported(void)
5133 {
5134 return false;
5135 }
5136
5137 static bool svm_has_wbinvd_exit(void)
5138 {
5139 return true;
5140 }
5141
5142 #define PRE_EX(exit) { .exit_code = (exit), \
5143 .stage = X86_ICPT_PRE_EXCEPT, }
5144 #define POST_EX(exit) { .exit_code = (exit), \
5145 .stage = X86_ICPT_POST_EXCEPT, }
5146 #define POST_MEM(exit) { .exit_code = (exit), \
5147 .stage = X86_ICPT_POST_MEMACCESS, }
5148
5149 static const struct __x86_intercept {
5150 u32 exit_code;
5151 enum x86_intercept_stage stage;
5152 } x86_intercept_map[] = {
5153 [x86_intercept_cr_read] = POST_EX(SVM_EXIT_READ_CR0),
5154 [x86_intercept_cr_write] = POST_EX(SVM_EXIT_WRITE_CR0),
5155 [x86_intercept_clts] = POST_EX(SVM_EXIT_WRITE_CR0),
5156 [x86_intercept_lmsw] = POST_EX(SVM_EXIT_WRITE_CR0),
5157 [x86_intercept_smsw] = POST_EX(SVM_EXIT_READ_CR0),
5158 [x86_intercept_dr_read] = POST_EX(SVM_EXIT_READ_DR0),
5159 [x86_intercept_dr_write] = POST_EX(SVM_EXIT_WRITE_DR0),
5160 [x86_intercept_sldt] = POST_EX(SVM_EXIT_LDTR_READ),
5161 [x86_intercept_str] = POST_EX(SVM_EXIT_TR_READ),
5162 [x86_intercept_lldt] = POST_EX(SVM_EXIT_LDTR_WRITE),
5163 [x86_intercept_ltr] = POST_EX(SVM_EXIT_TR_WRITE),
5164 [x86_intercept_sgdt] = POST_EX(SVM_EXIT_GDTR_READ),
5165 [x86_intercept_sidt] = POST_EX(SVM_EXIT_IDTR_READ),
5166 [x86_intercept_lgdt] = POST_EX(SVM_EXIT_GDTR_WRITE),
5167 [x86_intercept_lidt] = POST_EX(SVM_EXIT_IDTR_WRITE),
5168 [x86_intercept_vmrun] = POST_EX(SVM_EXIT_VMRUN),
5169 [x86_intercept_vmmcall] = POST_EX(SVM_EXIT_VMMCALL),
5170 [x86_intercept_vmload] = POST_EX(SVM_EXIT_VMLOAD),
5171 [x86_intercept_vmsave] = POST_EX(SVM_EXIT_VMSAVE),
5172 [x86_intercept_stgi] = POST_EX(SVM_EXIT_STGI),
5173 [x86_intercept_clgi] = POST_EX(SVM_EXIT_CLGI),
5174 [x86_intercept_skinit] = POST_EX(SVM_EXIT_SKINIT),
5175 [x86_intercept_invlpga] = POST_EX(SVM_EXIT_INVLPGA),
5176 [x86_intercept_rdtscp] = POST_EX(SVM_EXIT_RDTSCP),
5177 [x86_intercept_monitor] = POST_MEM(SVM_EXIT_MONITOR),
5178 [x86_intercept_mwait] = POST_EX(SVM_EXIT_MWAIT),
5179 [x86_intercept_invlpg] = POST_EX(SVM_EXIT_INVLPG),
5180 [x86_intercept_invd] = POST_EX(SVM_EXIT_INVD),
5181 [x86_intercept_wbinvd] = POST_EX(SVM_EXIT_WBINVD),
5182 [x86_intercept_wrmsr] = POST_EX(SVM_EXIT_MSR),
5183 [x86_intercept_rdtsc] = POST_EX(SVM_EXIT_RDTSC),
5184 [x86_intercept_rdmsr] = POST_EX(SVM_EXIT_MSR),
5185 [x86_intercept_rdpmc] = POST_EX(SVM_EXIT_RDPMC),
5186 [x86_intercept_cpuid] = PRE_EX(SVM_EXIT_CPUID),
5187 [x86_intercept_rsm] = PRE_EX(SVM_EXIT_RSM),
5188 [x86_intercept_pause] = PRE_EX(SVM_EXIT_PAUSE),
5189 [x86_intercept_pushf] = PRE_EX(SVM_EXIT_PUSHF),
5190 [x86_intercept_popf] = PRE_EX(SVM_EXIT_POPF),
5191 [x86_intercept_intn] = PRE_EX(SVM_EXIT_SWINT),
5192 [x86_intercept_iret] = PRE_EX(SVM_EXIT_IRET),
5193 [x86_intercept_icebp] = PRE_EX(SVM_EXIT_ICEBP),
5194 [x86_intercept_hlt] = POST_EX(SVM_EXIT_HLT),
5195 [x86_intercept_in] = POST_EX(SVM_EXIT_IOIO),
5196 [x86_intercept_ins] = POST_EX(SVM_EXIT_IOIO),
5197 [x86_intercept_out] = POST_EX(SVM_EXIT_IOIO),
5198 [x86_intercept_outs] = POST_EX(SVM_EXIT_IOIO),
5199 };
5200
5201 #undef PRE_EX
5202 #undef POST_EX
5203 #undef POST_MEM
5204
5205 static int svm_check_intercept(struct kvm_vcpu *vcpu,
5206 struct x86_instruction_info *info,
5207 enum x86_intercept_stage stage)
5208 {
5209 struct vcpu_svm *svm = to_svm(vcpu);
5210 int vmexit, ret = X86EMUL_CONTINUE;
5211 struct __x86_intercept icpt_info;
5212 struct vmcb *vmcb = svm->vmcb;
5213
5214 if (info->intercept >= ARRAY_SIZE(x86_intercept_map))
5215 goto out;
5216
5217 icpt_info = x86_intercept_map[info->intercept];
5218
5219 if (stage != icpt_info.stage)
5220 goto out;
5221
5222 switch (icpt_info.exit_code) {
5223 case SVM_EXIT_READ_CR0:
5224 if (info->intercept == x86_intercept_cr_read)
5225 icpt_info.exit_code += info->modrm_reg;
5226 break;
5227 case SVM_EXIT_WRITE_CR0: {
5228 unsigned long cr0, val;
5229 u64 intercept;
5230
5231 if (info->intercept == x86_intercept_cr_write)
5232 icpt_info.exit_code += info->modrm_reg;
5233
5234 if (icpt_info.exit_code != SVM_EXIT_WRITE_CR0 ||
5235 info->intercept == x86_intercept_clts)
5236 break;
5237
5238 intercept = svm->nested.intercept;
5239
5240 if (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0)))
5241 break;
5242
5243 cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
5244 val = info->src_val & ~SVM_CR0_SELECTIVE_MASK;
5245
5246 if (info->intercept == x86_intercept_lmsw) {
5247 cr0 &= 0xfUL;
5248 val &= 0xfUL;
5249 /* lmsw can't clear PE - catch this here */
5250 if (cr0 & X86_CR0_PE)
5251 val |= X86_CR0_PE;
5252 }
5253
5254 if (cr0 ^ val)
5255 icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;
5256
5257 break;
5258 }
5259 case SVM_EXIT_READ_DR0:
5260 case SVM_EXIT_WRITE_DR0:
5261 icpt_info.exit_code += info->modrm_reg;
5262 break;
5263 case SVM_EXIT_MSR:
5264 if (info->intercept == x86_intercept_wrmsr)
5265 vmcb->control.exit_info_1 = 1;
5266 else
5267 vmcb->control.exit_info_1 = 0;
5268 break;
5269 case SVM_EXIT_PAUSE:
5270 /*
5271 * We get this for NOP only, but pause
5272 * is rep not, check this here
5273 */
5274 if (info->rep_prefix != REPE_PREFIX)
5275 goto out;
5276 case SVM_EXIT_IOIO: {
5277 u64 exit_info;
5278 u32 bytes;
5279
5280 if (info->intercept == x86_intercept_in ||
5281 info->intercept == x86_intercept_ins) {
5282 exit_info = ((info->src_val & 0xffff) << 16) |
5283 SVM_IOIO_TYPE_MASK;
5284 bytes = info->dst_bytes;
5285 } else {
5286 exit_info = (info->dst_val & 0xffff) << 16;
5287 bytes = info->src_bytes;
5288 }
5289
5290 if (info->intercept == x86_intercept_outs ||
5291 info->intercept == x86_intercept_ins)
5292 exit_info |= SVM_IOIO_STR_MASK;
5293
5294 if (info->rep_prefix)
5295 exit_info |= SVM_IOIO_REP_MASK;
5296
5297 bytes = min(bytes, 4u);
5298
5299 exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;
5300
5301 exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);
5302
5303 vmcb->control.exit_info_1 = exit_info;
5304 vmcb->control.exit_info_2 = info->next_rip;
5305
5306 break;
5307 }
5308 default:
5309 break;
5310 }
5311
5312 /* TODO: Advertise NRIPS to guest hypervisor unconditionally */
5313 if (static_cpu_has(X86_FEATURE_NRIPS))
5314 vmcb->control.next_rip = info->next_rip;
5315 vmcb->control.exit_code = icpt_info.exit_code;
5316 vmexit = nested_svm_exit_handled(svm);
5317
5318 ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED
5319 : X86EMUL_CONTINUE;
5320
5321 out:
5322 return ret;
5323 }
5324
5325 static void svm_handle_external_intr(struct kvm_vcpu *vcpu)
5326 {
5327 local_irq_enable();
5328 /*
5329 * We must have an instruction with interrupts enabled, so
5330 * the timer interrupt isn't delayed by the interrupt shadow.
5331 */
5332 asm("nop");
5333 local_irq_disable();
5334 }
5335
5336 static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
5337 {
5338 }
5339
5340 static inline void avic_post_state_restore(struct kvm_vcpu *vcpu)
5341 {
5342 if (avic_handle_apic_id_update(vcpu) != 0)
5343 return;
5344 if (avic_handle_dfr_update(vcpu) != 0)
5345 return;
5346 avic_handle_ldr_update(vcpu);
5347 }
5348
5349 static void svm_setup_mce(struct kvm_vcpu *vcpu)
5350 {
5351 /* [63:9] are reserved. */
5352 vcpu->arch.mcg_cap &= 0x1ff;
5353 }
5354
5355 static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
5356 .cpu_has_kvm_support = has_svm,
5357 .disabled_by_bios = is_disabled,
5358 .hardware_setup = svm_hardware_setup,
5359 .hardware_unsetup = svm_hardware_unsetup,
5360 .check_processor_compatibility = svm_check_processor_compat,
5361 .hardware_enable = svm_hardware_enable,
5362 .hardware_disable = svm_hardware_disable,
5363 .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
5364 .cpu_has_high_real_mode_segbase = svm_has_high_real_mode_segbase,
5365
5366 .vcpu_create = svm_create_vcpu,
5367 .vcpu_free = svm_free_vcpu,
5368 .vcpu_reset = svm_vcpu_reset,
5369
5370 .vm_init = avic_vm_init,
5371 .vm_destroy = avic_vm_destroy,
5372
5373 .prepare_guest_switch = svm_prepare_guest_switch,
5374 .vcpu_load = svm_vcpu_load,
5375 .vcpu_put = svm_vcpu_put,
5376 .vcpu_blocking = svm_vcpu_blocking,
5377 .vcpu_unblocking = svm_vcpu_unblocking,
5378
5379 .update_bp_intercept = update_bp_intercept,
5380 .get_msr = svm_get_msr,
5381 .set_msr = svm_set_msr,
5382 .get_segment_base = svm_get_segment_base,
5383 .get_segment = svm_get_segment,
5384 .set_segment = svm_set_segment,
5385 .get_cpl = svm_get_cpl,
5386 .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
5387 .decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
5388 .decache_cr3 = svm_decache_cr3,
5389 .decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
5390 .set_cr0 = svm_set_cr0,
5391 .set_cr3 = svm_set_cr3,
5392 .set_cr4 = svm_set_cr4,
5393 .set_efer = svm_set_efer,
5394 .get_idt = svm_get_idt,
5395 .set_idt = svm_set_idt,
5396 .get_gdt = svm_get_gdt,
5397 .set_gdt = svm_set_gdt,
5398 .get_dr6 = svm_get_dr6,
5399 .set_dr6 = svm_set_dr6,
5400 .set_dr7 = svm_set_dr7,
5401 .sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
5402 .cache_reg = svm_cache_reg,
5403 .get_rflags = svm_get_rflags,
5404 .set_rflags = svm_set_rflags,
5405
5406 .get_pkru = svm_get_pkru,
5407
5408 .tlb_flush = svm_flush_tlb,
5409
5410 .run = svm_vcpu_run,
5411 .handle_exit = handle_exit,
5412 .skip_emulated_instruction = skip_emulated_instruction,
5413 .set_interrupt_shadow = svm_set_interrupt_shadow,
5414 .get_interrupt_shadow = svm_get_interrupt_shadow,
5415 .patch_hypercall = svm_patch_hypercall,
5416 .set_irq = svm_set_irq,
5417 .set_nmi = svm_inject_nmi,
5418 .queue_exception = svm_queue_exception,
5419 .cancel_injection = svm_cancel_injection,
5420 .interrupt_allowed = svm_interrupt_allowed,
5421 .nmi_allowed = svm_nmi_allowed,
5422 .get_nmi_mask = svm_get_nmi_mask,
5423 .set_nmi_mask = svm_set_nmi_mask,
5424 .enable_nmi_window = enable_nmi_window,
5425 .enable_irq_window = enable_irq_window,
5426 .update_cr8_intercept = update_cr8_intercept,
5427 .set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode,
5428 .get_enable_apicv = svm_get_enable_apicv,
5429 .refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
5430 .load_eoi_exitmap = svm_load_eoi_exitmap,
5431 .hwapic_irr_update = svm_hwapic_irr_update,
5432 .hwapic_isr_update = svm_hwapic_isr_update,
5433 .apicv_post_state_restore = avic_post_state_restore,
5434
5435 .set_tss_addr = svm_set_tss_addr,
5436 .get_tdp_level = get_npt_level,
5437 .get_mt_mask = svm_get_mt_mask,
5438
5439 .get_exit_info = svm_get_exit_info,
5440
5441 .get_lpage_level = svm_get_lpage_level,
5442
5443 .cpuid_update = svm_cpuid_update,
5444
5445 .rdtscp_supported = svm_rdtscp_supported,
5446 .invpcid_supported = svm_invpcid_supported,
5447 .mpx_supported = svm_mpx_supported,
5448 .xsaves_supported = svm_xsaves_supported,
5449
5450 .set_supported_cpuid = svm_set_supported_cpuid,
5451
5452 .has_wbinvd_exit = svm_has_wbinvd_exit,
5453
5454 .write_tsc_offset = svm_write_tsc_offset,
5455
5456 .set_tdp_cr3 = set_tdp_cr3,
5457
5458 .check_intercept = svm_check_intercept,
5459 .handle_external_intr = svm_handle_external_intr,
5460
5461 .sched_in = svm_sched_in,
5462
5463 .pmu_ops = &amd_pmu_ops,
5464 .deliver_posted_interrupt = svm_deliver_avic_intr,
5465 .update_pi_irte = svm_update_pi_irte,
5466 .setup_mce = svm_setup_mce,
5467 };
5468
5469 static int __init svm_init(void)
5470 {
5471 return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
5472 __alignof__(struct vcpu_svm), THIS_MODULE);
5473 }
5474
5475 static void __exit svm_exit(void)
5476 {
5477 kvm_exit();
5478 }
5479
5480 module_init(svm_init)
5481 module_exit(svm_exit)
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