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UBUNTU: Ubuntu-5.3.0-29.31
[mirror_ubuntu-eoan-kernel.git] / arch / x86 / kvm / cpuid.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Kernel-based Virtual Machine driver for Linux
4 * cpuid support routines
5 *
6 * derived from arch/x86/kvm/x86.c
7 *
8 * Copyright 2011 Red Hat, Inc. and/or its affiliates.
9 * Copyright IBM Corporation, 2008
10 */
11
12 #include <linux/kvm_host.h>
13 #include <linux/export.h>
14 #include <linux/vmalloc.h>
15 #include <linux/uaccess.h>
16 #include <linux/sched/stat.h>
17
18 #include <asm/processor.h>
19 #include <asm/user.h>
20 #include <asm/fpu/xstate.h>
21 #include "cpuid.h"
22 #include "lapic.h"
23 #include "mmu.h"
24 #include "trace.h"
25 #include "pmu.h"
26
27 static u32 xstate_required_size(u64 xstate_bv, bool compacted)
28 {
29 int feature_bit = 0;
30 u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
31
32 xstate_bv &= XFEATURE_MASK_EXTEND;
33 while (xstate_bv) {
34 if (xstate_bv & 0x1) {
35 u32 eax, ebx, ecx, edx, offset;
36 cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx);
37 offset = compacted ? ret : ebx;
38 ret = max(ret, offset + eax);
39 }
40
41 xstate_bv >>= 1;
42 feature_bit++;
43 }
44
45 return ret;
46 }
47
48 bool kvm_mpx_supported(void)
49 {
50 return ((host_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR))
51 && kvm_x86_ops->mpx_supported());
52 }
53 EXPORT_SYMBOL_GPL(kvm_mpx_supported);
54
55 u64 kvm_supported_xcr0(void)
56 {
57 u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0;
58
59 if (!kvm_mpx_supported())
60 xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
61
62 return xcr0;
63 }
64
65 #define F(x) bit(X86_FEATURE_##x)
66
67 int kvm_update_cpuid(struct kvm_vcpu *vcpu)
68 {
69 struct kvm_cpuid_entry2 *best;
70 struct kvm_lapic *apic = vcpu->arch.apic;
71
72 best = kvm_find_cpuid_entry(vcpu, 1, 0);
73 if (!best)
74 return 0;
75
76 /* Update OSXSAVE bit */
77 if (boot_cpu_has(X86_FEATURE_XSAVE) && best->function == 0x1) {
78 best->ecx &= ~F(OSXSAVE);
79 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
80 best->ecx |= F(OSXSAVE);
81 }
82
83 best->edx &= ~F(APIC);
84 if (vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE)
85 best->edx |= F(APIC);
86
87 if (apic) {
88 if (best->ecx & F(TSC_DEADLINE_TIMER))
89 apic->lapic_timer.timer_mode_mask = 3 << 17;
90 else
91 apic->lapic_timer.timer_mode_mask = 1 << 17;
92 }
93
94 best = kvm_find_cpuid_entry(vcpu, 7, 0);
95 if (best) {
96 /* Update OSPKE bit */
97 if (boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7) {
98 best->ecx &= ~F(OSPKE);
99 if (kvm_read_cr4_bits(vcpu, X86_CR4_PKE))
100 best->ecx |= F(OSPKE);
101 }
102 }
103
104 best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
105 if (!best) {
106 vcpu->arch.guest_supported_xcr0 = 0;
107 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
108 } else {
109 vcpu->arch.guest_supported_xcr0 =
110 (best->eax | ((u64)best->edx << 32)) &
111 kvm_supported_xcr0();
112 vcpu->arch.guest_xstate_size = best->ebx =
113 xstate_required_size(vcpu->arch.xcr0, false);
114 }
115
116 best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
117 if (best && (best->eax & (F(XSAVES) | F(XSAVEC))))
118 best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
119
120 /*
121 * The existing code assumes virtual address is 48-bit or 57-bit in the
122 * canonical address checks; exit if it is ever changed.
123 */
124 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
125 if (best) {
126 int vaddr_bits = (best->eax & 0xff00) >> 8;
127
128 if (vaddr_bits != 48 && vaddr_bits != 57 && vaddr_bits != 0)
129 return -EINVAL;
130 }
131
132 best = kvm_find_cpuid_entry(vcpu, KVM_CPUID_FEATURES, 0);
133 if (kvm_hlt_in_guest(vcpu->kvm) && best &&
134 (best->eax & (1 << KVM_FEATURE_PV_UNHALT)))
135 best->eax &= ~(1 << KVM_FEATURE_PV_UNHALT);
136
137 if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT)) {
138 best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
139 if (best) {
140 if (vcpu->arch.ia32_misc_enable_msr & MSR_IA32_MISC_ENABLE_MWAIT)
141 best->ecx |= F(MWAIT);
142 else
143 best->ecx &= ~F(MWAIT);
144 }
145 }
146
147 /* Update physical-address width */
148 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
149 kvm_mmu_reset_context(vcpu);
150
151 kvm_pmu_refresh(vcpu);
152 return 0;
153 }
154
155 static int is_efer_nx(void)
156 {
157 unsigned long long efer = 0;
158
159 rdmsrl_safe(MSR_EFER, &efer);
160 return efer & EFER_NX;
161 }
162
163 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
164 {
165 int i;
166 struct kvm_cpuid_entry2 *e, *entry;
167
168 entry = NULL;
169 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
170 e = &vcpu->arch.cpuid_entries[i];
171 if (e->function == 0x80000001) {
172 entry = e;
173 break;
174 }
175 }
176 if (entry && (entry->edx & F(NX)) && !is_efer_nx()) {
177 entry->edx &= ~F(NX);
178 printk(KERN_INFO "kvm: guest NX capability removed\n");
179 }
180 }
181
182 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu)
183 {
184 struct kvm_cpuid_entry2 *best;
185
186 best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
187 if (!best || best->eax < 0x80000008)
188 goto not_found;
189 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
190 if (best)
191 return best->eax & 0xff;
192 not_found:
193 return 36;
194 }
195 EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr);
196
197 /* when an old userspace process fills a new kernel module */
198 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
199 struct kvm_cpuid *cpuid,
200 struct kvm_cpuid_entry __user *entries)
201 {
202 int r, i;
203 struct kvm_cpuid_entry *cpuid_entries = NULL;
204
205 r = -E2BIG;
206 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
207 goto out;
208 r = -ENOMEM;
209 if (cpuid->nent) {
210 cpuid_entries =
211 vmalloc(array_size(sizeof(struct kvm_cpuid_entry),
212 cpuid->nent));
213 if (!cpuid_entries)
214 goto out;
215 r = -EFAULT;
216 if (copy_from_user(cpuid_entries, entries,
217 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
218 goto out;
219 }
220 for (i = 0; i < cpuid->nent; i++) {
221 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
222 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
223 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
224 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
225 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
226 vcpu->arch.cpuid_entries[i].index = 0;
227 vcpu->arch.cpuid_entries[i].flags = 0;
228 vcpu->arch.cpuid_entries[i].padding[0] = 0;
229 vcpu->arch.cpuid_entries[i].padding[1] = 0;
230 vcpu->arch.cpuid_entries[i].padding[2] = 0;
231 }
232 vcpu->arch.cpuid_nent = cpuid->nent;
233 cpuid_fix_nx_cap(vcpu);
234 kvm_apic_set_version(vcpu);
235 kvm_x86_ops->cpuid_update(vcpu);
236 r = kvm_update_cpuid(vcpu);
237
238 out:
239 vfree(cpuid_entries);
240 return r;
241 }
242
243 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
244 struct kvm_cpuid2 *cpuid,
245 struct kvm_cpuid_entry2 __user *entries)
246 {
247 int r;
248
249 r = -E2BIG;
250 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
251 goto out;
252 r = -EFAULT;
253 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
254 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
255 goto out;
256 vcpu->arch.cpuid_nent = cpuid->nent;
257 kvm_apic_set_version(vcpu);
258 kvm_x86_ops->cpuid_update(vcpu);
259 r = kvm_update_cpuid(vcpu);
260 out:
261 return r;
262 }
263
264 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
265 struct kvm_cpuid2 *cpuid,
266 struct kvm_cpuid_entry2 __user *entries)
267 {
268 int r;
269
270 r = -E2BIG;
271 if (cpuid->nent < vcpu->arch.cpuid_nent)
272 goto out;
273 r = -EFAULT;
274 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
275 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
276 goto out;
277 return 0;
278
279 out:
280 cpuid->nent = vcpu->arch.cpuid_nent;
281 return r;
282 }
283
284 static void cpuid_mask(u32 *word, int wordnum)
285 {
286 *word &= boot_cpu_data.x86_capability[wordnum];
287 }
288
289 static void do_host_cpuid(struct kvm_cpuid_entry2 *entry, u32 function,
290 u32 index)
291 {
292 entry->function = function;
293 entry->index = index;
294 entry->flags = 0;
295
296 cpuid_count(entry->function, entry->index,
297 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
298
299 switch (function) {
300 case 2:
301 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
302 break;
303 case 4:
304 case 7:
305 case 0xb:
306 case 0xd:
307 case 0xf:
308 case 0x10:
309 case 0x12:
310 case 0x14:
311 case 0x17:
312 case 0x18:
313 case 0x1f:
314 case 0x8000001d:
315 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
316 break;
317 }
318 }
319
320 static int __do_cpuid_func_emulated(struct kvm_cpuid_entry2 *entry,
321 u32 func, int *nent, int maxnent)
322 {
323 entry->function = func;
324 entry->index = 0;
325 entry->flags = 0;
326
327 switch (func) {
328 case 0:
329 entry->eax = 7;
330 ++*nent;
331 break;
332 case 1:
333 entry->ecx = F(MOVBE);
334 ++*nent;
335 break;
336 case 7:
337 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
338 entry->eax = 0;
339 entry->ecx = F(RDPID);
340 ++*nent;
341 default:
342 break;
343 }
344
345 return 0;
346 }
347
348 static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry, int index)
349 {
350 unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
351 unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0;
352 unsigned f_umip = kvm_x86_ops->umip_emulated() ? F(UMIP) : 0;
353 unsigned f_intel_pt = kvm_x86_ops->pt_supported() ? F(INTEL_PT) : 0;
354 unsigned f_la57;
355
356 /* cpuid 7.0.ebx */
357 const u32 kvm_cpuid_7_0_ebx_x86_features =
358 F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
359 F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) |
360 F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) |
361 F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) |
362 F(SHA_NI) | F(AVX512BW) | F(AVX512VL) | f_intel_pt;
363
364 /* cpuid 7.0.ecx*/
365 const u32 kvm_cpuid_7_0_ecx_x86_features =
366 F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ |
367 F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) |
368 F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) |
369 F(CLDEMOTE) | F(MOVDIRI) | F(MOVDIR64B);
370
371 /* cpuid 7.0.edx*/
372 const u32 kvm_cpuid_7_0_edx_x86_features =
373 F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
374 F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
375 F(MD_CLEAR);
376
377 /* cpuid 7.1.eax */
378 const u32 kvm_cpuid_7_1_eax_x86_features =
379 F(AVX512_BF16);
380
381 switch (index) {
382 case 0:
383 entry->eax = min(entry->eax, 1u);
384 entry->ebx &= kvm_cpuid_7_0_ebx_x86_features;
385 cpuid_mask(&entry->ebx, CPUID_7_0_EBX);
386 /* TSC_ADJUST is emulated */
387 entry->ebx |= F(TSC_ADJUST);
388
389 entry->ecx &= kvm_cpuid_7_0_ecx_x86_features;
390 f_la57 = entry->ecx & F(LA57);
391 cpuid_mask(&entry->ecx, CPUID_7_ECX);
392 /* Set LA57 based on hardware capability. */
393 entry->ecx |= f_la57;
394 entry->ecx |= f_umip;
395 /* PKU is not yet implemented for shadow paging. */
396 if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE))
397 entry->ecx &= ~F(PKU);
398
399 entry->edx &= kvm_cpuid_7_0_edx_x86_features;
400 cpuid_mask(&entry->edx, CPUID_7_EDX);
401 /*
402 * We emulate ARCH_CAPABILITIES in software even
403 * if the host doesn't support it.
404 */
405 entry->edx |= F(ARCH_CAPABILITIES);
406 break;
407 case 1:
408 entry->eax &= kvm_cpuid_7_1_eax_x86_features;
409 entry->ebx = 0;
410 entry->ecx = 0;
411 entry->edx = 0;
412 break;
413 default:
414 WARN_ON_ONCE(1);
415 entry->eax = 0;
416 entry->ebx = 0;
417 entry->ecx = 0;
418 entry->edx = 0;
419 break;
420 }
421 }
422
423 static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
424 int *nent, int maxnent)
425 {
426 int r;
427 unsigned f_nx = is_efer_nx() ? F(NX) : 0;
428 #ifdef CONFIG_X86_64
429 unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
430 ? F(GBPAGES) : 0;
431 unsigned f_lm = F(LM);
432 #else
433 unsigned f_gbpages = 0;
434 unsigned f_lm = 0;
435 #endif
436 unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
437 unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0;
438 unsigned f_intel_pt = kvm_x86_ops->pt_supported() ? F(INTEL_PT) : 0;
439
440 /* cpuid 1.edx */
441 const u32 kvm_cpuid_1_edx_x86_features =
442 F(FPU) | F(VME) | F(DE) | F(PSE) |
443 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
444 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
445 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
446 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) |
447 0 /* Reserved, DS, ACPI */ | F(MMX) |
448 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
449 0 /* HTT, TM, Reserved, PBE */;
450 /* cpuid 0x80000001.edx */
451 const u32 kvm_cpuid_8000_0001_edx_x86_features =
452 F(FPU) | F(VME) | F(DE) | F(PSE) |
453 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
454 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
455 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
456 F(PAT) | F(PSE36) | 0 /* Reserved */ |
457 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
458 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
459 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
460 /* cpuid 1.ecx */
461 const u32 kvm_cpuid_1_ecx_x86_features =
462 /* NOTE: MONITOR (and MWAIT) are emulated as NOP,
463 * but *not* advertised to guests via CPUID ! */
464 F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
465 0 /* DS-CPL, VMX, SMX, EST */ |
466 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
467 F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ |
468 F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
469 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
470 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
471 F(F16C) | F(RDRAND);
472 /* cpuid 0x80000001.ecx */
473 const u32 kvm_cpuid_8000_0001_ecx_x86_features =
474 F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
475 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
476 F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) |
477 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM) |
478 F(TOPOEXT) | F(PERFCTR_CORE);
479
480 /* cpuid 0x80000008.ebx */
481 const u32 kvm_cpuid_8000_0008_ebx_x86_features =
482 F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) |
483 F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON);
484
485 /* cpuid 0xC0000001.edx */
486 const u32 kvm_cpuid_C000_0001_edx_x86_features =
487 F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
488 F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
489 F(PMM) | F(PMM_EN);
490
491 /* cpuid 0xD.1.eax */
492 const u32 kvm_cpuid_D_1_eax_x86_features =
493 F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves;
494
495 /* all calls to cpuid_count() should be made on the same cpu */
496 get_cpu();
497
498 r = -E2BIG;
499
500 if (*nent >= maxnent)
501 goto out;
502
503 do_host_cpuid(entry, function, 0);
504 ++*nent;
505
506 switch (function) {
507 case 0:
508 /* Limited to the highest leaf implemented in KVM. */
509 entry->eax = min(entry->eax, 0x1fU);
510 break;
511 case 1:
512 entry->edx &= kvm_cpuid_1_edx_x86_features;
513 cpuid_mask(&entry->edx, CPUID_1_EDX);
514 entry->ecx &= kvm_cpuid_1_ecx_x86_features;
515 cpuid_mask(&entry->ecx, CPUID_1_ECX);
516 /* we support x2apic emulation even if host does not support
517 * it since we emulate x2apic in software */
518 entry->ecx |= F(X2APIC);
519 break;
520 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
521 * may return different values. This forces us to get_cpu() before
522 * issuing the first command, and also to emulate this annoying behavior
523 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
524 case 2: {
525 int t, times = entry->eax & 0xff;
526
527 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
528 for (t = 1; t < times; ++t) {
529 if (*nent >= maxnent)
530 goto out;
531
532 do_host_cpuid(&entry[t], function, 0);
533 ++*nent;
534 }
535 break;
536 }
537 /* functions 4 and 0x8000001d have additional index. */
538 case 4:
539 case 0x8000001d: {
540 int i, cache_type;
541
542 /* read more entries until cache_type is zero */
543 for (i = 1; ; ++i) {
544 if (*nent >= maxnent)
545 goto out;
546
547 cache_type = entry[i - 1].eax & 0x1f;
548 if (!cache_type)
549 break;
550 do_host_cpuid(&entry[i], function, i);
551 ++*nent;
552 }
553 break;
554 }
555 case 6: /* Thermal management */
556 entry->eax = 0x4; /* allow ARAT */
557 entry->ebx = 0;
558 entry->ecx = 0;
559 entry->edx = 0;
560 break;
561 /* function 7 has additional index. */
562 case 7: {
563 int i;
564
565 for (i = 0; ; ) {
566 do_cpuid_7_mask(&entry[i], i);
567 if (i == entry->eax)
568 break;
569 if (*nent >= maxnent)
570 goto out;
571
572 ++i;
573 do_host_cpuid(&entry[i], function, i);
574 ++*nent;
575 }
576 break;
577 }
578 case 9:
579 break;
580 case 0xa: { /* Architectural Performance Monitoring */
581 struct x86_pmu_capability cap;
582 union cpuid10_eax eax;
583 union cpuid10_edx edx;
584
585 perf_get_x86_pmu_capability(&cap);
586
587 /*
588 * Only support guest architectural pmu on a host
589 * with architectural pmu.
590 */
591 if (!cap.version)
592 memset(&cap, 0, sizeof(cap));
593
594 eax.split.version_id = min(cap.version, 2);
595 eax.split.num_counters = cap.num_counters_gp;
596 eax.split.bit_width = cap.bit_width_gp;
597 eax.split.mask_length = cap.events_mask_len;
598
599 edx.split.num_counters_fixed = cap.num_counters_fixed;
600 edx.split.bit_width_fixed = cap.bit_width_fixed;
601 edx.split.reserved = 0;
602
603 entry->eax = eax.full;
604 entry->ebx = cap.events_mask;
605 entry->ecx = 0;
606 entry->edx = edx.full;
607 break;
608 }
609 /*
610 * Per Intel's SDM, the 0x1f is a superset of 0xb,
611 * thus they can be handled by common code.
612 */
613 case 0x1f:
614 case 0xb: {
615 int i, level_type;
616
617 /* read more entries until level_type is zero */
618 for (i = 1; ; ++i) {
619 if (*nent >= maxnent)
620 goto out;
621
622 level_type = entry[i - 1].ecx & 0xff00;
623 if (!level_type)
624 break;
625 do_host_cpuid(&entry[i], function, i);
626 ++*nent;
627 }
628 break;
629 }
630 case 0xd: {
631 int idx, i;
632 u64 supported = kvm_supported_xcr0();
633
634 entry->eax &= supported;
635 entry->ebx = xstate_required_size(supported, false);
636 entry->ecx = entry->ebx;
637 entry->edx &= supported >> 32;
638 if (!supported)
639 break;
640
641 for (idx = 1, i = 1; idx < 64; ++idx) {
642 u64 mask = ((u64)1 << idx);
643 if (*nent >= maxnent)
644 goto out;
645
646 do_host_cpuid(&entry[i], function, idx);
647 if (idx == 1) {
648 entry[i].eax &= kvm_cpuid_D_1_eax_x86_features;
649 cpuid_mask(&entry[i].eax, CPUID_D_1_EAX);
650 entry[i].ebx = 0;
651 if (entry[i].eax & (F(XSAVES)|F(XSAVEC)))
652 entry[i].ebx =
653 xstate_required_size(supported,
654 true);
655 } else {
656 if (entry[i].eax == 0 || !(supported & mask))
657 continue;
658 if (WARN_ON_ONCE(entry[i].ecx & 1))
659 continue;
660 }
661 entry[i].ecx = 0;
662 entry[i].edx = 0;
663 ++*nent;
664 ++i;
665 }
666 break;
667 }
668 /* Intel PT */
669 case 0x14: {
670 int t, times = entry->eax;
671
672 if (!f_intel_pt)
673 break;
674
675 for (t = 1; t <= times; ++t) {
676 if (*nent >= maxnent)
677 goto out;
678 do_host_cpuid(&entry[t], function, t);
679 ++*nent;
680 }
681 break;
682 }
683 case KVM_CPUID_SIGNATURE: {
684 static const char signature[12] = "KVMKVMKVM\0\0";
685 const u32 *sigptr = (const u32 *)signature;
686 entry->eax = KVM_CPUID_FEATURES;
687 entry->ebx = sigptr[0];
688 entry->ecx = sigptr[1];
689 entry->edx = sigptr[2];
690 break;
691 }
692 case KVM_CPUID_FEATURES:
693 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
694 (1 << KVM_FEATURE_NOP_IO_DELAY) |
695 (1 << KVM_FEATURE_CLOCKSOURCE2) |
696 (1 << KVM_FEATURE_ASYNC_PF) |
697 (1 << KVM_FEATURE_PV_EOI) |
698 (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
699 (1 << KVM_FEATURE_PV_UNHALT) |
700 (1 << KVM_FEATURE_PV_TLB_FLUSH) |
701 (1 << KVM_FEATURE_ASYNC_PF_VMEXIT) |
702 (1 << KVM_FEATURE_PV_SEND_IPI) |
703 (1 << KVM_FEATURE_POLL_CONTROL) |
704 (1 << KVM_FEATURE_PV_SCHED_YIELD);
705
706 if (sched_info_on())
707 entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
708
709 entry->ebx = 0;
710 entry->ecx = 0;
711 entry->edx = 0;
712 break;
713 case 0x80000000:
714 entry->eax = min(entry->eax, 0x8000001f);
715 break;
716 case 0x80000001:
717 entry->edx &= kvm_cpuid_8000_0001_edx_x86_features;
718 cpuid_mask(&entry->edx, CPUID_8000_0001_EDX);
719 entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features;
720 cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX);
721 break;
722 case 0x80000007: /* Advanced power management */
723 /* invariant TSC is CPUID.80000007H:EDX[8] */
724 entry->edx &= (1 << 8);
725 /* mask against host */
726 entry->edx &= boot_cpu_data.x86_power;
727 entry->eax = entry->ebx = entry->ecx = 0;
728 break;
729 case 0x80000008: {
730 unsigned g_phys_as = (entry->eax >> 16) & 0xff;
731 unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
732 unsigned phys_as = entry->eax & 0xff;
733
734 if (!g_phys_as)
735 g_phys_as = phys_as;
736 entry->eax = g_phys_as | (virt_as << 8);
737 entry->edx = 0;
738 /*
739 * IBRS, IBPB and VIRT_SSBD aren't necessarily present in
740 * hardware cpuid
741 */
742 if (boot_cpu_has(X86_FEATURE_AMD_IBPB))
743 entry->ebx |= F(AMD_IBPB);
744 if (boot_cpu_has(X86_FEATURE_AMD_IBRS))
745 entry->ebx |= F(AMD_IBRS);
746 if (boot_cpu_has(X86_FEATURE_VIRT_SSBD))
747 entry->ebx |= F(VIRT_SSBD);
748 entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features;
749 cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX);
750 /*
751 * The preference is to use SPEC CTRL MSR instead of the
752 * VIRT_SPEC MSR.
753 */
754 if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) &&
755 !boot_cpu_has(X86_FEATURE_AMD_SSBD))
756 entry->ebx |= F(VIRT_SSBD);
757 break;
758 }
759 case 0x80000019:
760 entry->ecx = entry->edx = 0;
761 break;
762 case 0x8000001a:
763 case 0x8000001e:
764 break;
765 /*Add support for Centaur's CPUID instruction*/
766 case 0xC0000000:
767 /*Just support up to 0xC0000004 now*/
768 entry->eax = min(entry->eax, 0xC0000004);
769 break;
770 case 0xC0000001:
771 entry->edx &= kvm_cpuid_C000_0001_edx_x86_features;
772 cpuid_mask(&entry->edx, CPUID_C000_0001_EDX);
773 break;
774 case 3: /* Processor serial number */
775 case 5: /* MONITOR/MWAIT */
776 case 0xC0000002:
777 case 0xC0000003:
778 case 0xC0000004:
779 default:
780 entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
781 break;
782 }
783
784 kvm_x86_ops->set_supported_cpuid(function, entry);
785
786 r = 0;
787
788 out:
789 put_cpu();
790
791 return r;
792 }
793
794 static int do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 func,
795 int *nent, int maxnent, unsigned int type)
796 {
797 if (type == KVM_GET_EMULATED_CPUID)
798 return __do_cpuid_func_emulated(entry, func, nent, maxnent);
799
800 return __do_cpuid_func(entry, func, nent, maxnent);
801 }
802
803 #undef F
804
805 struct kvm_cpuid_param {
806 u32 func;
807 bool (*qualifier)(const struct kvm_cpuid_param *param);
808 };
809
810 static bool is_centaur_cpu(const struct kvm_cpuid_param *param)
811 {
812 return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR;
813 }
814
815 static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries,
816 __u32 num_entries, unsigned int ioctl_type)
817 {
818 int i;
819 __u32 pad[3];
820
821 if (ioctl_type != KVM_GET_EMULATED_CPUID)
822 return false;
823
824 /*
825 * We want to make sure that ->padding is being passed clean from
826 * userspace in case we want to use it for something in the future.
827 *
828 * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we
829 * have to give ourselves satisfied only with the emulated side. /me
830 * sheds a tear.
831 */
832 for (i = 0; i < num_entries; i++) {
833 if (copy_from_user(pad, entries[i].padding, sizeof(pad)))
834 return true;
835
836 if (pad[0] || pad[1] || pad[2])
837 return true;
838 }
839 return false;
840 }
841
842 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
843 struct kvm_cpuid_entry2 __user *entries,
844 unsigned int type)
845 {
846 struct kvm_cpuid_entry2 *cpuid_entries;
847 int limit, nent = 0, r = -E2BIG, i;
848 u32 func;
849 static const struct kvm_cpuid_param param[] = {
850 { .func = 0 },
851 { .func = 0x80000000 },
852 { .func = 0xC0000000, .qualifier = is_centaur_cpu },
853 { .func = KVM_CPUID_SIGNATURE },
854 };
855
856 if (cpuid->nent < 1)
857 goto out;
858 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
859 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
860
861 if (sanity_check_entries(entries, cpuid->nent, type))
862 return -EINVAL;
863
864 r = -ENOMEM;
865 cpuid_entries = vzalloc(array_size(sizeof(struct kvm_cpuid_entry2),
866 cpuid->nent));
867 if (!cpuid_entries)
868 goto out;
869
870 r = 0;
871 for (i = 0; i < ARRAY_SIZE(param); i++) {
872 const struct kvm_cpuid_param *ent = &param[i];
873
874 if (ent->qualifier && !ent->qualifier(ent))
875 continue;
876
877 r = do_cpuid_func(&cpuid_entries[nent], ent->func,
878 &nent, cpuid->nent, type);
879
880 if (r)
881 goto out_free;
882
883 limit = cpuid_entries[nent - 1].eax;
884 for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func)
885 r = do_cpuid_func(&cpuid_entries[nent], func,
886 &nent, cpuid->nent, type);
887
888 if (r)
889 goto out_free;
890 }
891
892 r = -EFAULT;
893 if (copy_to_user(entries, cpuid_entries,
894 nent * sizeof(struct kvm_cpuid_entry2)))
895 goto out_free;
896 cpuid->nent = nent;
897 r = 0;
898
899 out_free:
900 vfree(cpuid_entries);
901 out:
902 return r;
903 }
904
905 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
906 {
907 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
908 struct kvm_cpuid_entry2 *ej;
909 int j = i;
910 int nent = vcpu->arch.cpuid_nent;
911
912 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
913 /* when no next entry is found, the current entry[i] is reselected */
914 do {
915 j = (j + 1) % nent;
916 ej = &vcpu->arch.cpuid_entries[j];
917 } while (ej->function != e->function);
918
919 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
920
921 return j;
922 }
923
924 /* find an entry with matching function, matching index (if needed), and that
925 * should be read next (if it's stateful) */
926 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
927 u32 function, u32 index)
928 {
929 if (e->function != function)
930 return 0;
931 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
932 return 0;
933 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
934 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
935 return 0;
936 return 1;
937 }
938
939 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
940 u32 function, u32 index)
941 {
942 int i;
943 struct kvm_cpuid_entry2 *best = NULL;
944
945 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
946 struct kvm_cpuid_entry2 *e;
947
948 e = &vcpu->arch.cpuid_entries[i];
949 if (is_matching_cpuid_entry(e, function, index)) {
950 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
951 move_to_next_stateful_cpuid_entry(vcpu, i);
952 best = e;
953 break;
954 }
955 }
956 return best;
957 }
958 EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
959
960 /*
961 * If no match is found, check whether we exceed the vCPU's limit
962 * and return the content of the highest valid _standard_ leaf instead.
963 * This is to satisfy the CPUID specification.
964 */
965 static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu,
966 u32 function, u32 index)
967 {
968 struct kvm_cpuid_entry2 *maxlevel;
969
970 maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
971 if (!maxlevel || maxlevel->eax >= function)
972 return NULL;
973 if (function & 0x80000000) {
974 maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0);
975 if (!maxlevel)
976 return NULL;
977 }
978 return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index);
979 }
980
981 bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
982 u32 *ecx, u32 *edx, bool check_limit)
983 {
984 u32 function = *eax, index = *ecx;
985 struct kvm_cpuid_entry2 *best;
986 bool entry_found = true;
987
988 best = kvm_find_cpuid_entry(vcpu, function, index);
989
990 if (!best) {
991 entry_found = false;
992 if (!check_limit)
993 goto out;
994
995 best = check_cpuid_limit(vcpu, function, index);
996 }
997
998 out:
999 if (best) {
1000 *eax = best->eax;
1001 *ebx = best->ebx;
1002 *ecx = best->ecx;
1003 *edx = best->edx;
1004 } else
1005 *eax = *ebx = *ecx = *edx = 0;
1006 trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx, entry_found);
1007 return entry_found;
1008 }
1009 EXPORT_SYMBOL_GPL(kvm_cpuid);
1010
1011 int kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1012 {
1013 u32 eax, ebx, ecx, edx;
1014
1015 if (cpuid_fault_enabled(vcpu) && !kvm_require_cpl(vcpu, 0))
1016 return 1;
1017
1018 eax = kvm_rax_read(vcpu);
1019 ecx = kvm_rcx_read(vcpu);
1020 kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx, true);
1021 kvm_rax_write(vcpu, eax);
1022 kvm_rbx_write(vcpu, ebx);
1023 kvm_rcx_write(vcpu, ecx);
1024 kvm_rdx_write(vcpu, edx);
1025 return kvm_skip_emulated_instruction(vcpu);
1026 }
1027 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
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