2 * Kernel-based Virtual Machine driver for Linux
3 * cpuid support routines
5 * derived from arch/x86/kvm/x86.c
7 * Copyright 2011 Red Hat, Inc. and/or its affiliates.
8 * Copyright IBM Corporation, 2008
10 * This work is licensed under the terms of the GNU GPL, version 2. See
11 * the COPYING file in the top-level directory.
15 #include <linux/kvm_host.h>
16 #include <linux/module.h>
17 #include <linux/vmalloc.h>
18 #include <linux/uaccess.h>
20 #include <asm/xsave.h>
26 static u32 xstate_required_size(u64 xstate_bv)
29 u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
31 xstate_bv &= XSTATE_EXTEND_MASK;
33 if (xstate_bv & 0x1) {
34 u32 eax, ebx, ecx, edx;
35 cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx);
36 ret = max(ret, eax + ebx);
46 u64 kvm_supported_xcr0(void)
48 u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0;
50 if (!kvm_x86_ops->mpx_supported())
51 xcr0 &= ~(XSTATE_BNDREGS | XSTATE_BNDCSR);
56 int kvm_update_cpuid(struct kvm_vcpu *vcpu)
58 struct kvm_cpuid_entry2 *best;
59 struct kvm_lapic *apic = vcpu->arch.apic;
61 best = kvm_find_cpuid_entry(vcpu, 1, 0);
65 /* Update OSXSAVE bit */
66 if (cpu_has_xsave && best->function == 0x1) {
67 best->ecx &= ~(bit(X86_FEATURE_OSXSAVE));
68 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
69 best->ecx |= bit(X86_FEATURE_OSXSAVE);
73 if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER))
74 apic->lapic_timer.timer_mode_mask = 3 << 17;
76 apic->lapic_timer.timer_mode_mask = 1 << 17;
79 best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
81 vcpu->arch.guest_supported_xcr0 = 0;
82 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
84 vcpu->arch.guest_supported_xcr0 =
85 (best->eax | ((u64)best->edx << 32)) &
87 vcpu->arch.guest_xstate_size = best->ebx =
88 xstate_required_size(vcpu->arch.xcr0);
92 * The existing code assumes virtual address is 48-bit in the canonical
93 * address checks; exit if it is ever changed.
95 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
96 if (best && ((best->eax & 0xff00) >> 8) != 48 &&
97 ((best->eax & 0xff00) >> 8) != 0)
100 kvm_pmu_cpuid_update(vcpu);
104 static int is_efer_nx(void)
106 unsigned long long efer = 0;
108 rdmsrl_safe(MSR_EFER, &efer);
109 return efer & EFER_NX;
112 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
115 struct kvm_cpuid_entry2 *e, *entry;
118 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
119 e = &vcpu->arch.cpuid_entries[i];
120 if (e->function == 0x80000001) {
125 if (entry && (entry->edx & bit(X86_FEATURE_NX)) && !is_efer_nx()) {
126 entry->edx &= ~bit(X86_FEATURE_NX);
127 printk(KERN_INFO "kvm: guest NX capability removed\n");
131 /* when an old userspace process fills a new kernel module */
132 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
133 struct kvm_cpuid *cpuid,
134 struct kvm_cpuid_entry __user *entries)
137 struct kvm_cpuid_entry *cpuid_entries;
140 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
143 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
147 if (copy_from_user(cpuid_entries, entries,
148 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
150 for (i = 0; i < cpuid->nent; i++) {
151 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
152 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
153 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
154 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
155 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
156 vcpu->arch.cpuid_entries[i].index = 0;
157 vcpu->arch.cpuid_entries[i].flags = 0;
158 vcpu->arch.cpuid_entries[i].padding[0] = 0;
159 vcpu->arch.cpuid_entries[i].padding[1] = 0;
160 vcpu->arch.cpuid_entries[i].padding[2] = 0;
162 vcpu->arch.cpuid_nent = cpuid->nent;
163 cpuid_fix_nx_cap(vcpu);
164 kvm_apic_set_version(vcpu);
165 kvm_x86_ops->cpuid_update(vcpu);
166 r = kvm_update_cpuid(vcpu);
169 vfree(cpuid_entries);
174 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
175 struct kvm_cpuid2 *cpuid,
176 struct kvm_cpuid_entry2 __user *entries)
181 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
184 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
185 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
187 vcpu->arch.cpuid_nent = cpuid->nent;
188 kvm_apic_set_version(vcpu);
189 kvm_x86_ops->cpuid_update(vcpu);
190 r = kvm_update_cpuid(vcpu);
195 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
196 struct kvm_cpuid2 *cpuid,
197 struct kvm_cpuid_entry2 __user *entries)
202 if (cpuid->nent < vcpu->arch.cpuid_nent)
205 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
206 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
211 cpuid->nent = vcpu->arch.cpuid_nent;
215 static void cpuid_mask(u32 *word, int wordnum)
217 *word &= boot_cpu_data.x86_capability[wordnum];
220 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
223 entry->function = function;
224 entry->index = index;
225 cpuid_count(entry->function, entry->index,
226 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
230 #define F(x) bit(X86_FEATURE_##x)
232 static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry,
233 u32 func, u32 index, int *nent, int maxnent)
237 entry->eax = 1; /* only one leaf currently */
241 entry->ecx = F(MOVBE);
248 entry->function = func;
249 entry->index = index;
254 static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
255 u32 index, int *nent, int maxnent)
258 unsigned f_nx = is_efer_nx() ? F(NX) : 0;
260 unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
262 unsigned f_lm = F(LM);
264 unsigned f_gbpages = 0;
267 unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
268 unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
269 unsigned f_mpx = kvm_x86_ops->mpx_supported() ? F(MPX) : 0;
272 const u32 kvm_supported_word0_x86_features =
273 F(FPU) | F(VME) | F(DE) | F(PSE) |
274 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
275 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
276 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
277 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) |
278 0 /* Reserved, DS, ACPI */ | F(MMX) |
279 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
280 0 /* HTT, TM, Reserved, PBE */;
281 /* cpuid 0x80000001.edx */
282 const u32 kvm_supported_word1_x86_features =
283 F(FPU) | F(VME) | F(DE) | F(PSE) |
284 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
285 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
286 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
287 F(PAT) | F(PSE36) | 0 /* Reserved */ |
288 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
289 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
290 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
292 const u32 kvm_supported_word4_x86_features =
293 /* NOTE: MONITOR (and MWAIT) are emulated as NOP,
294 * but *not* advertised to guests via CPUID ! */
295 F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
296 0 /* DS-CPL, VMX, SMX, EST */ |
297 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
298 F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ |
299 F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
300 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
301 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
303 /* cpuid 0x80000001.ecx */
304 const u32 kvm_supported_word6_x86_features =
305 F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
306 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
307 F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) |
308 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
310 /* cpuid 0xC0000001.edx */
311 const u32 kvm_supported_word5_x86_features =
312 F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
313 F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
317 const u32 kvm_supported_word9_x86_features =
318 F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
319 F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) |
322 /* all calls to cpuid_count() should be made on the same cpu */
327 if (*nent >= maxnent)
330 do_cpuid_1_ent(entry, function, index);
335 entry->eax = min(entry->eax, (u32)0xd);
338 entry->edx &= kvm_supported_word0_x86_features;
339 cpuid_mask(&entry->edx, 0);
340 entry->ecx &= kvm_supported_word4_x86_features;
341 cpuid_mask(&entry->ecx, 4);
342 /* we support x2apic emulation even if host does not support
343 * it since we emulate x2apic in software */
344 entry->ecx |= F(X2APIC);
346 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
347 * may return different values. This forces us to get_cpu() before
348 * issuing the first command, and also to emulate this annoying behavior
349 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
351 int t, times = entry->eax & 0xff;
353 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
354 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
355 for (t = 1; t < times; ++t) {
356 if (*nent >= maxnent)
359 do_cpuid_1_ent(&entry[t], function, 0);
360 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
365 /* function 4 has additional index. */
369 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
370 /* read more entries until cache_type is zero */
372 if (*nent >= maxnent)
375 cache_type = entry[i - 1].eax & 0x1f;
378 do_cpuid_1_ent(&entry[i], function, i);
380 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
386 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
387 /* Mask ebx against host capability word 9 */
389 entry->ebx &= kvm_supported_word9_x86_features;
390 cpuid_mask(&entry->ebx, 9);
391 // TSC_ADJUST is emulated
392 entry->ebx |= F(TSC_ADJUST);
402 case 0xa: { /* Architectural Performance Monitoring */
403 struct x86_pmu_capability cap;
404 union cpuid10_eax eax;
405 union cpuid10_edx edx;
407 perf_get_x86_pmu_capability(&cap);
410 * Only support guest architectural pmu on a host
411 * with architectural pmu.
414 memset(&cap, 0, sizeof(cap));
416 eax.split.version_id = min(cap.version, 2);
417 eax.split.num_counters = cap.num_counters_gp;
418 eax.split.bit_width = cap.bit_width_gp;
419 eax.split.mask_length = cap.events_mask_len;
421 edx.split.num_counters_fixed = cap.num_counters_fixed;
422 edx.split.bit_width_fixed = cap.bit_width_fixed;
423 edx.split.reserved = 0;
425 entry->eax = eax.full;
426 entry->ebx = cap.events_mask;
428 entry->edx = edx.full;
431 /* function 0xb has additional index. */
435 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
436 /* read more entries until level_type is zero */
438 if (*nent >= maxnent)
441 level_type = entry[i - 1].ecx & 0xff00;
444 do_cpuid_1_ent(&entry[i], function, i);
446 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
453 u64 supported = kvm_supported_xcr0();
455 entry->eax &= supported;
456 entry->edx &= supported >> 32;
457 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
458 for (idx = 1, i = 1; idx < 64; ++idx) {
459 u64 mask = ((u64)1 << idx);
460 if (*nent >= maxnent)
463 do_cpuid_1_ent(&entry[i], function, idx);
464 if (entry[i].eax == 0 || !(supported & mask))
467 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
473 case KVM_CPUID_SIGNATURE: {
474 static const char signature[12] = "KVMKVMKVM\0\0";
475 const u32 *sigptr = (const u32 *)signature;
476 entry->eax = KVM_CPUID_FEATURES;
477 entry->ebx = sigptr[0];
478 entry->ecx = sigptr[1];
479 entry->edx = sigptr[2];
482 case KVM_CPUID_FEATURES:
483 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
484 (1 << KVM_FEATURE_NOP_IO_DELAY) |
485 (1 << KVM_FEATURE_CLOCKSOURCE2) |
486 (1 << KVM_FEATURE_ASYNC_PF) |
487 (1 << KVM_FEATURE_PV_EOI) |
488 (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
489 (1 << KVM_FEATURE_PV_UNHALT);
492 entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
499 entry->eax = min(entry->eax, 0x8000001a);
502 entry->edx &= kvm_supported_word1_x86_features;
503 cpuid_mask(&entry->edx, 1);
504 entry->ecx &= kvm_supported_word6_x86_features;
505 cpuid_mask(&entry->ecx, 6);
507 case 0x80000007: /* Advanced power management */
508 /* invariant TSC is CPUID.80000007H:EDX[8] */
509 entry->edx &= (1 << 8);
510 /* mask against host */
511 entry->edx &= boot_cpu_data.x86_power;
512 entry->eax = entry->ebx = entry->ecx = 0;
515 unsigned g_phys_as = (entry->eax >> 16) & 0xff;
516 unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
517 unsigned phys_as = entry->eax & 0xff;
521 entry->eax = g_phys_as | (virt_as << 8);
522 entry->ebx = entry->edx = 0;
526 entry->ecx = entry->edx = 0;
532 /*Add support for Centaur's CPUID instruction*/
534 /*Just support up to 0xC0000004 now*/
535 entry->eax = min(entry->eax, 0xC0000004);
538 entry->edx &= kvm_supported_word5_x86_features;
539 cpuid_mask(&entry->edx, 5);
541 case 3: /* Processor serial number */
542 case 5: /* MONITOR/MWAIT */
543 case 6: /* Thermal management */
548 entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
552 kvm_x86_ops->set_supported_cpuid(function, entry);
562 static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func,
563 u32 idx, int *nent, int maxnent, unsigned int type)
565 if (type == KVM_GET_EMULATED_CPUID)
566 return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent);
568 return __do_cpuid_ent(entry, func, idx, nent, maxnent);
573 struct kvm_cpuid_param {
577 bool (*qualifier)(const struct kvm_cpuid_param *param);
580 static bool is_centaur_cpu(const struct kvm_cpuid_param *param)
582 return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR;
585 static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries,
586 __u32 num_entries, unsigned int ioctl_type)
591 if (ioctl_type != KVM_GET_EMULATED_CPUID)
595 * We want to make sure that ->padding is being passed clean from
596 * userspace in case we want to use it for something in the future.
598 * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we
599 * have to give ourselves satisfied only with the emulated side. /me
602 for (i = 0; i < num_entries; i++) {
603 if (copy_from_user(pad, entries[i].padding, sizeof(pad)))
606 if (pad[0] || pad[1] || pad[2])
612 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
613 struct kvm_cpuid_entry2 __user *entries,
616 struct kvm_cpuid_entry2 *cpuid_entries;
617 int limit, nent = 0, r = -E2BIG, i;
619 static const struct kvm_cpuid_param param[] = {
620 { .func = 0, .has_leaf_count = true },
621 { .func = 0x80000000, .has_leaf_count = true },
622 { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true },
623 { .func = KVM_CPUID_SIGNATURE },
624 { .func = KVM_CPUID_FEATURES },
629 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
630 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
632 if (sanity_check_entries(entries, cpuid->nent, type))
636 cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
641 for (i = 0; i < ARRAY_SIZE(param); i++) {
642 const struct kvm_cpuid_param *ent = ¶m[i];
644 if (ent->qualifier && !ent->qualifier(ent))
647 r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx,
648 &nent, cpuid->nent, type);
653 if (!ent->has_leaf_count)
656 limit = cpuid_entries[nent - 1].eax;
657 for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func)
658 r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx,
659 &nent, cpuid->nent, type);
666 if (copy_to_user(entries, cpuid_entries,
667 nent * sizeof(struct kvm_cpuid_entry2)))
673 vfree(cpuid_entries);
678 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
680 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
681 int j, nent = vcpu->arch.cpuid_nent;
683 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
684 /* when no next entry is found, the current entry[i] is reselected */
685 for (j = i + 1; ; j = (j + 1) % nent) {
686 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
687 if (ej->function == e->function) {
688 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
692 return 0; /* silence gcc, even though control never reaches here */
695 /* find an entry with matching function, matching index (if needed), and that
696 * should be read next (if it's stateful) */
697 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
698 u32 function, u32 index)
700 if (e->function != function)
702 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
704 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
705 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
710 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
711 u32 function, u32 index)
714 struct kvm_cpuid_entry2 *best = NULL;
716 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
717 struct kvm_cpuid_entry2 *e;
719 e = &vcpu->arch.cpuid_entries[i];
720 if (is_matching_cpuid_entry(e, function, index)) {
721 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
722 move_to_next_stateful_cpuid_entry(vcpu, i);
729 EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
731 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
733 struct kvm_cpuid_entry2 *best;
735 best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
736 if (!best || best->eax < 0x80000008)
738 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
740 return best->eax & 0xff;
744 EXPORT_SYMBOL_GPL(cpuid_maxphyaddr);
747 * If no match is found, check whether we exceed the vCPU's limit
748 * and return the content of the highest valid _standard_ leaf instead.
749 * This is to satisfy the CPUID specification.
751 static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu,
752 u32 function, u32 index)
754 struct kvm_cpuid_entry2 *maxlevel;
756 maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
757 if (!maxlevel || maxlevel->eax >= function)
759 if (function & 0x80000000) {
760 maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0);
764 return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index);
767 void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
769 u32 function = *eax, index = *ecx;
770 struct kvm_cpuid_entry2 *best;
772 best = kvm_find_cpuid_entry(vcpu, function, index);
775 best = check_cpuid_limit(vcpu, function, index);
778 * Perfmon not yet supported for L2 guest.
780 if (is_guest_mode(vcpu) && function == 0xa)
789 *eax = *ebx = *ecx = *edx = 0;
790 trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx);
792 EXPORT_SYMBOL_GPL(kvm_cpuid);
794 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
796 u32 function, eax, ebx, ecx, edx;
798 function = eax = kvm_register_read(vcpu, VCPU_REGS_RAX);
799 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
800 kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx);
801 kvm_register_write(vcpu, VCPU_REGS_RAX, eax);
802 kvm_register_write(vcpu, VCPU_REGS_RBX, ebx);
803 kvm_register_write(vcpu, VCPU_REGS_RCX, ecx);
804 kvm_register_write(vcpu, VCPU_REGS_RDX, edx);
805 kvm_x86_ops->skip_emulated_instruction(vcpu);
807 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);