?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/nouveau/tegra: Fix error handling
[linux/fpc-iii.git] / arch / x86 / kvm / cpuid.c
blobafa7bbb596cd745be6494c53bd9764af503616e2
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 * cpuid support routines
4 *
5 * derived from arch/x86/kvm/x86.c
6 *
7 * Copyright 2011 Red Hat, Inc. and/or its affiliates.
8 * Copyright IBM Corporation, 2008
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2. See
11 * the COPYING file in the top-level directory.
12 *
13 */
14
15 #include <linux/kvm_host.h>
16 #include <linux/export.h>
17 #include <linux/vmalloc.h>
18 #include <linux/uaccess.h>
19 #include <asm/fpu/internal.h> /* For use_eager_fpu. Ugh! */
20 #include <asm/user.h>
21 #include <asm/fpu/xstate.h>
22 #include "cpuid.h"
23 #include "lapic.h"
24 #include "mmu.h"
25 #include "trace.h"
26 #include "pmu.h"
27
28 static u32 xstate_required_size(u64 xstate_bv, bool compacted)
29 {
30 int feature_bit = 0;
31 u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
32
33 xstate_bv &= XFEATURE_MASK_EXTEND;
34 while (xstate_bv) {
35 if (xstate_bv & 0x1) {
36 u32 eax, ebx, ecx, edx, offset;
37 cpuid_count(0xD, feature_bit, &eax, &ebx, &ecx, &edx);
38 offset = compacted ? ret : ebx;
39 ret = max(ret, offset + eax);
40 }
41
42 xstate_bv >>= 1;
43 feature_bit++;
44 }
45
46 return ret;
47 }
48
49 bool kvm_mpx_supported(void)
50 {
51 return ((host_xcr0 & (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR))
52 && kvm_x86_ops->mpx_supported());
53 }
54 EXPORT_SYMBOL_GPL(kvm_mpx_supported);
55
56 u64 kvm_supported_xcr0(void)
57 {
58 u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0;
59
60 if (!kvm_mpx_supported())
61 xcr0 &= ~(XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR);
62
63 return xcr0;
64 }
65
66 #define F(x) bit(X86_FEATURE_##x)
67
68 int kvm_update_cpuid(struct kvm_vcpu *vcpu)
69 {
70 struct kvm_cpuid_entry2 *best;
71 struct kvm_lapic *apic = vcpu->arch.apic;
72
73 best = kvm_find_cpuid_entry(vcpu, 1, 0);
74 if (!best)
75 return 0;
76
77 /* Update OSXSAVE bit */
78 if (boot_cpu_has(X86_FEATURE_XSAVE) && best->function == 0x1) {
79 best->ecx &= ~F(OSXSAVE);
80 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
81 best->ecx |= F(OSXSAVE);
82 }
83
84 if (apic) {
85 if (best->ecx & F(TSC_DEADLINE_TIMER))
86 apic->lapic_timer.timer_mode_mask = 3 << 17;
87 else
88 apic->lapic_timer.timer_mode_mask = 1 << 17;
89 }
90
91 best = kvm_find_cpuid_entry(vcpu, 7, 0);
92 if (best) {
93 /* Update OSPKE bit */
94 if (boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7) {
95 best->ecx &= ~F(OSPKE);
96 if (kvm_read_cr4_bits(vcpu, X86_CR4_PKE))
97 best->ecx |= F(OSPKE);
98 }
99 }
100
101 best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
102 if (!best) {
103 vcpu->arch.guest_supported_xcr0 = 0;
104 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
105 } else {
106 vcpu->arch.guest_supported_xcr0 =
107 (best->eax | ((u64)best->edx << 32)) &
108 kvm_supported_xcr0();
109 vcpu->arch.guest_xstate_size = best->ebx =
110 xstate_required_size(vcpu->arch.xcr0, false);
111 }
112
113 best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
114 if (best && (best->eax & (F(XSAVES) | F(XSAVEC))))
115 best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
116
117 if (use_eager_fpu())
118 kvm_x86_ops->fpu_activate(vcpu);
119
120 /*
121 * The existing code assumes virtual address is 48-bit in the canonical
122 * address checks; exit if it is ever changed.
123 */
124 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
125 if (best && ((best->eax & 0xff00) >> 8) != 48 &&
126 ((best->eax & 0xff00) >> 8) != 0)
127 return -EINVAL;
128
129 /* Update physical-address width */
130 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
131
132 kvm_pmu_refresh(vcpu);
133 return 0;
134 }
135
136 static int is_efer_nx(void)
137 {
138 unsigned long long efer = 0;
139
140 rdmsrl_safe(MSR_EFER, &efer);
141 return efer & EFER_NX;
142 }
143
144 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
145 {
146 int i;
147 struct kvm_cpuid_entry2 *e, *entry;
148
149 entry = NULL;
150 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
151 e = &vcpu->arch.cpuid_entries[i];
152 if (e->function == 0x80000001) {
153 entry = e;
154 break;
155 }
156 }
157 if (entry && (entry->edx & F(NX)) && !is_efer_nx()) {
158 entry->edx &= ~F(NX);
159 printk(KERN_INFO "kvm: guest NX capability removed\n");
160 }
161 }
162
163 int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu)
164 {
165 struct kvm_cpuid_entry2 *best;
166
167 best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
168 if (!best || best->eax < 0x80000008)
169 goto not_found;
170 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
171 if (best)
172 return best->eax & 0xff;
173 not_found:
174 return 36;
175 }
176 EXPORT_SYMBOL_GPL(cpuid_query_maxphyaddr);
177
178 /* when an old userspace process fills a new kernel module */
179 int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
180 struct kvm_cpuid *cpuid,
181 struct kvm_cpuid_entry __user *entries)
182 {
183 int r, i;
184 struct kvm_cpuid_entry *cpuid_entries = NULL;
185
186 r = -E2BIG;
187 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
188 goto out;
189 r = -ENOMEM;
190 if (cpuid->nent) {
191 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) *
192 cpuid->nent);
193 if (!cpuid_entries)
194 goto out;
195 r = -EFAULT;
196 if (copy_from_user(cpuid_entries, entries,
197 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
198 goto out;
199 }
200 for (i = 0; i < cpuid->nent; i++) {
201 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
202 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
203 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
204 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
205 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
206 vcpu->arch.cpuid_entries[i].index = 0;
207 vcpu->arch.cpuid_entries[i].flags = 0;
208 vcpu->arch.cpuid_entries[i].padding[0] = 0;
209 vcpu->arch.cpuid_entries[i].padding[1] = 0;
210 vcpu->arch.cpuid_entries[i].padding[2] = 0;
211 }
212 vcpu->arch.cpuid_nent = cpuid->nent;
213 cpuid_fix_nx_cap(vcpu);
214 kvm_apic_set_version(vcpu);
215 kvm_x86_ops->cpuid_update(vcpu);
216 r = kvm_update_cpuid(vcpu);
217
218 out:
219 vfree(cpuid_entries);
220 return r;
221 }
222
223 int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
224 struct kvm_cpuid2 *cpuid,
225 struct kvm_cpuid_entry2 __user *entries)
226 {
227 int r;
228
229 r = -E2BIG;
230 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
231 goto out;
232 r = -EFAULT;
233 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
234 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
235 goto out;
236 vcpu->arch.cpuid_nent = cpuid->nent;
237 kvm_apic_set_version(vcpu);
238 kvm_x86_ops->cpuid_update(vcpu);
239 r = kvm_update_cpuid(vcpu);
240 out:
241 return r;
242 }
243
244 int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
245 struct kvm_cpuid2 *cpuid,
246 struct kvm_cpuid_entry2 __user *entries)
247 {
248 int r;
249
250 r = -E2BIG;
251 if (cpuid->nent < vcpu->arch.cpuid_nent)
252 goto out;
253 r = -EFAULT;
254 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
255 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
256 goto out;
257 return 0;
258
259 out:
260 cpuid->nent = vcpu->arch.cpuid_nent;
261 return r;
262 }
263
264 static void cpuid_mask(u32 *word, int wordnum)
265 {
266 *word &= boot_cpu_data.x86_capability[wordnum];
267 }
268
269 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
270 u32 index)
271 {
272 entry->function = function;
273 entry->index = index;
274 cpuid_count(entry->function, entry->index,
275 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
276 entry->flags = 0;
277 }
278
279 static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry,
280 u32 func, u32 index, int *nent, int maxnent)
281 {
282 switch (func) {
283 case 0:
284 entry->eax = 1; /* only one leaf currently */
285 ++*nent;
286 break;
287 case 1:
288 entry->ecx = F(MOVBE);
289 ++*nent;
290 break;
291 default:
292 break;
293 }
294
295 entry->function = func;
296 entry->index = index;
297
298 return 0;
299 }
300
301 static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
302 u32 index, int *nent, int maxnent)
303 {
304 int r;
305 unsigned f_nx = is_efer_nx() ? F(NX) : 0;
306 #ifdef CONFIG_X86_64
307 unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
308 ? F(GBPAGES) : 0;
309 unsigned f_lm = F(LM);
310 #else
311 unsigned f_gbpages = 0;
312 unsigned f_lm = 0;
313 #endif
314 unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
315 unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
316 unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0;
317 unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0;
318
319 /* cpuid 1.edx */
320 const u32 kvm_cpuid_1_edx_x86_features =
321 F(FPU) | F(VME) | F(DE) | F(PSE) |
322 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
323 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
324 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
325 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) |
326 0 /* Reserved, DS, ACPI */ | F(MMX) |
327 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
328 0 /* HTT, TM, Reserved, PBE */;
329 /* cpuid 0x80000001.edx */
330 const u32 kvm_cpuid_8000_0001_edx_x86_features =
331 F(FPU) | F(VME) | F(DE) | F(PSE) |
332 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
333 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
334 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
335 F(PAT) | F(PSE36) | 0 /* Reserved */ |
336 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
337 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
338 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
339 /* cpuid 1.ecx */
340 const u32 kvm_cpuid_1_ecx_x86_features =
341 /* NOTE: MONITOR (and MWAIT) are emulated as NOP,
342 * but *not* advertised to guests via CPUID ! */
343 F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
344 0 /* DS-CPL, VMX, SMX, EST */ |
345 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
346 F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ |
347 F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
348 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
349 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
350 F(F16C) | F(RDRAND);
351 /* cpuid 0x80000001.ecx */
352 const u32 kvm_cpuid_8000_0001_ecx_x86_features =
353 F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
354 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
355 F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) |
356 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
357
358 /* cpuid 0xC0000001.edx */
359 const u32 kvm_cpuid_C000_0001_edx_x86_features =
360 F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
361 F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
362 F(PMM) | F(PMM_EN);
363
364 /* cpuid 7.0.ebx */
365 const u32 kvm_cpuid_7_0_ebx_x86_features =
366 F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
367 F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) |
368 F(ADX) | F(SMAP) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) |
369 F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) |
370 F(AVX512BW) | F(AVX512VL);
371
372 /* cpuid 0xD.1.eax */
373 const u32 kvm_cpuid_D_1_eax_x86_features =
374 F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves;
375
376 /* cpuid 7.0.ecx*/
377 const u32 kvm_cpuid_7_0_ecx_x86_features = F(PKU) | 0 /*OSPKE*/;
378
379 /* all calls to cpuid_count() should be made on the same cpu */
380 get_cpu();
381
382 r = -E2BIG;
383
384 if (*nent >= maxnent)
385 goto out;
386
387 do_cpuid_1_ent(entry, function, index);
388 ++*nent;
389
390 switch (function) {
391 case 0:
392 entry->eax = min(entry->eax, (u32)0xd);
393 break;
394 case 1:
395 entry->edx &= kvm_cpuid_1_edx_x86_features;
396 cpuid_mask(&entry->edx, CPUID_1_EDX);
397 entry->ecx &= kvm_cpuid_1_ecx_x86_features;
398 cpuid_mask(&entry->ecx, CPUID_1_ECX);
399 /* we support x2apic emulation even if host does not support
400 * it since we emulate x2apic in software */
401 entry->ecx |= F(X2APIC);
402 break;
403 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
404 * may return different values. This forces us to get_cpu() before
405 * issuing the first command, and also to emulate this annoying behavior
406 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
407 case 2: {
408 int t, times = entry->eax & 0xff;
409
410 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
411 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
412 for (t = 1; t < times; ++t) {
413 if (*nent >= maxnent)
414 goto out;
415
416 do_cpuid_1_ent(&entry[t], function, 0);
417 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
418 ++*nent;
419 }
420 break;
421 }
422 /* function 4 has additional index. */
423 case 4: {
424 int i, cache_type;
425
426 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
427 /* read more entries until cache_type is zero */
428 for (i = 1; ; ++i) {
429 if (*nent >= maxnent)
430 goto out;
431
432 cache_type = entry[i - 1].eax & 0x1f;
433 if (!cache_type)
434 break;
435 do_cpuid_1_ent(&entry[i], function, i);
436 entry[i].flags |=
437 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
438 ++*nent;
439 }
440 break;
441 }
442 case 6: /* Thermal management */
443 entry->eax = 0x4; /* allow ARAT */
444 entry->ebx = 0;
445 entry->ecx = 0;
446 entry->edx = 0;
447 break;
448 case 7: {
449 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
450 /* Mask ebx against host capability word 9 */
451 if (index == 0) {
452 entry->ebx &= kvm_cpuid_7_0_ebx_x86_features;
453 cpuid_mask(&entry->ebx, CPUID_7_0_EBX);
454 // TSC_ADJUST is emulated
455 entry->ebx |= F(TSC_ADJUST);
456 entry->ecx &= kvm_cpuid_7_0_ecx_x86_features;
457 cpuid_mask(&entry->ecx, CPUID_7_ECX);
458 /* PKU is not yet implemented for shadow paging. */
459 if (!tdp_enabled)
460 entry->ecx &= ~F(PKU);
461 } else {
462 entry->ebx = 0;
463 entry->ecx = 0;
464 }
465 entry->eax = 0;
466 entry->edx = 0;
467 break;
468 }
469 case 9:
470 break;
471 case 0xa: { /* Architectural Performance Monitoring */
472 struct x86_pmu_capability cap;
473 union cpuid10_eax eax;
474 union cpuid10_edx edx;
475
476 perf_get_x86_pmu_capability(&cap);
477
478 /*
479 * Only support guest architectural pmu on a host
480 * with architectural pmu.
481 */
482 if (!cap.version)
483 memset(&cap, 0, sizeof(cap));
484
485 eax.split.version_id = min(cap.version, 2);
486 eax.split.num_counters = cap.num_counters_gp;
487 eax.split.bit_width = cap.bit_width_gp;
488 eax.split.mask_length = cap.events_mask_len;
489
490 edx.split.num_counters_fixed = cap.num_counters_fixed;
491 edx.split.bit_width_fixed = cap.bit_width_fixed;
492 edx.split.reserved = 0;
493
494 entry->eax = eax.full;
495 entry->ebx = cap.events_mask;
496 entry->ecx = 0;
497 entry->edx = edx.full;
498 break;
499 }
500 /* function 0xb has additional index. */
501 case 0xb: {
502 int i, level_type;
503
504 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
505 /* read more entries until level_type is zero */
506 for (i = 1; ; ++i) {
507 if (*nent >= maxnent)
508 goto out;
509
510 level_type = entry[i - 1].ecx & 0xff00;
511 if (!level_type)
512 break;
513 do_cpuid_1_ent(&entry[i], function, i);
514 entry[i].flags |=
515 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
516 ++*nent;
517 }
518 break;
519 }
520 case 0xd: {
521 int idx, i;
522 u64 supported = kvm_supported_xcr0();
523
524 entry->eax &= supported;
525 entry->ebx = xstate_required_size(supported, false);
526 entry->ecx = entry->ebx;
527 entry->edx &= supported >> 32;
528 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
529 if (!supported)
530 break;
531
532 for (idx = 1, i = 1; idx < 64; ++idx) {
533 u64 mask = ((u64)1 << idx);
534 if (*nent >= maxnent)
535 goto out;
536
537 do_cpuid_1_ent(&entry[i], function, idx);
538 if (idx == 1) {
539 entry[i].eax &= kvm_cpuid_D_1_eax_x86_features;
540 cpuid_mask(&entry[i].eax, CPUID_D_1_EAX);
541 entry[i].ebx = 0;
542 if (entry[i].eax & (F(XSAVES)|F(XSAVEC)))
543 entry[i].ebx =
544 xstate_required_size(supported,
545 true);
546 } else {
547 if (entry[i].eax == 0 || !(supported & mask))
548 continue;
549 if (WARN_ON_ONCE(entry[i].ecx & 1))
550 continue;
551 }
552 entry[i].ecx = 0;
553 entry[i].edx = 0;
554 entry[i].flags |=
555 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
556 ++*nent;
557 ++i;
558 }
559 break;
560 }
561 case KVM_CPUID_SIGNATURE: {
562 static const char signature[12] = "KVMKVMKVM\0\0";
563 const u32 *sigptr = (const u32 *)signature;
564 entry->eax = KVM_CPUID_FEATURES;
565 entry->ebx = sigptr[0];
566 entry->ecx = sigptr[1];
567 entry->edx = sigptr[2];
568 break;
569 }
570 case KVM_CPUID_FEATURES:
571 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
572 (1 << KVM_FEATURE_NOP_IO_DELAY) |
573 (1 << KVM_FEATURE_CLOCKSOURCE2) |
574 (1 << KVM_FEATURE_ASYNC_PF) |
575 (1 << KVM_FEATURE_PV_EOI) |
576 (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
577 (1 << KVM_FEATURE_PV_UNHALT);
578
579 if (sched_info_on())
580 entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
581
582 entry->ebx = 0;
583 entry->ecx = 0;
584 entry->edx = 0;
585 break;
586 case 0x80000000:
587 entry->eax = min(entry->eax, 0x8000001a);
588 break;
589 case 0x80000001:
590 entry->edx &= kvm_cpuid_8000_0001_edx_x86_features;
591 cpuid_mask(&entry->edx, CPUID_8000_0001_EDX);
592 entry->ecx &= kvm_cpuid_8000_0001_ecx_x86_features;
593 cpuid_mask(&entry->ecx, CPUID_8000_0001_ECX);
594 break;
595 case 0x80000007: /* Advanced power management */
596 /* invariant TSC is CPUID.80000007H:EDX[8] */
597 entry->edx &= (1 << 8);
598 /* mask against host */
599 entry->edx &= boot_cpu_data.x86_power;
600 entry->eax = entry->ebx = entry->ecx = 0;
601 break;
602 case 0x80000008: {
603 unsigned g_phys_as = (entry->eax >> 16) & 0xff;
604 unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
605 unsigned phys_as = entry->eax & 0xff;
606
607 if (!g_phys_as)
608 g_phys_as = phys_as;
609 entry->eax = g_phys_as | (virt_as << 8);
610 entry->ebx = entry->edx = 0;
611 break;
612 }
613 case 0x80000019:
614 entry->ecx = entry->edx = 0;
615 break;
616 case 0x8000001a:
617 break;
618 case 0x8000001d:
619 break;
620 /*Add support for Centaur's CPUID instruction*/
621 case 0xC0000000:
622 /*Just support up to 0xC0000004 now*/
623 entry->eax = min(entry->eax, 0xC0000004);
624 break;
625 case 0xC0000001:
626 entry->edx &= kvm_cpuid_C000_0001_edx_x86_features;
627 cpuid_mask(&entry->edx, CPUID_C000_0001_EDX);
628 break;
629 case 3: /* Processor serial number */
630 case 5: /* MONITOR/MWAIT */
631 case 0xC0000002:
632 case 0xC0000003:
633 case 0xC0000004:
634 default:
635 entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
636 break;
637 }
638
639 kvm_x86_ops->set_supported_cpuid(function, entry);
640
641 r = 0;
642
643 out:
644 put_cpu();
645
646 return r;
647 }
648
649 static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func,
650 u32 idx, int *nent, int maxnent, unsigned int type)
651 {
652 if (type == KVM_GET_EMULATED_CPUID)
653 return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent);
654
655 return __do_cpuid_ent(entry, func, idx, nent, maxnent);
656 }
657
658 #undef F
659
660 struct kvm_cpuid_param {
661 u32 func;
662 u32 idx;
663 bool has_leaf_count;
664 bool (*qualifier)(const struct kvm_cpuid_param *param);
665 };
666
667 static bool is_centaur_cpu(const struct kvm_cpuid_param *param)
668 {
669 return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR;
670 }
671
672 static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries,
673 __u32 num_entries, unsigned int ioctl_type)
674 {
675 int i;
676 __u32 pad[3];
677
678 if (ioctl_type != KVM_GET_EMULATED_CPUID)
679 return false;
680
681 /*
682 * We want to make sure that ->padding is being passed clean from
683 * userspace in case we want to use it for something in the future.
684 *
685 * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we
686 * have to give ourselves satisfied only with the emulated side. /me
687 * sheds a tear.
688 */
689 for (i = 0; i < num_entries; i++) {
690 if (copy_from_user(pad, entries[i].padding, sizeof(pad)))
691 return true;
692
693 if (pad[0] || pad[1] || pad[2])
694 return true;
695 }
696 return false;
697 }
698
699 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
700 struct kvm_cpuid_entry2 __user *entries,
701 unsigned int type)
702 {
703 struct kvm_cpuid_entry2 *cpuid_entries;
704 int limit, nent = 0, r = -E2BIG, i;
705 u32 func;
706 static const struct kvm_cpuid_param param[] = {
707 { .func = 0, .has_leaf_count = true },
708 { .func = 0x80000000, .has_leaf_count = true },
709 { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true },
710 { .func = KVM_CPUID_SIGNATURE },
711 { .func = KVM_CPUID_FEATURES },
712 };
713
714 if (cpuid->nent < 1)
715 goto out;
716 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
717 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
718
719 if (sanity_check_entries(entries, cpuid->nent, type))
720 return -EINVAL;
721
722 r = -ENOMEM;
723 cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
724 if (!cpuid_entries)
725 goto out;
726
727 r = 0;
728 for (i = 0; i < ARRAY_SIZE(param); i++) {
729 const struct kvm_cpuid_param *ent = &param[i];
730
731 if (ent->qualifier && !ent->qualifier(ent))
732 continue;
733
734 r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx,
735 &nent, cpuid->nent, type);
736
737 if (r)
738 goto out_free;
739
740 if (!ent->has_leaf_count)
741 continue;
742
743 limit = cpuid_entries[nent - 1].eax;
744 for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func)
745 r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx,
746 &nent, cpuid->nent, type);
747
748 if (r)
749 goto out_free;
750 }
751
752 r = -EFAULT;
753 if (copy_to_user(entries, cpuid_entries,
754 nent * sizeof(struct kvm_cpuid_entry2)))
755 goto out_free;
756 cpuid->nent = nent;
757 r = 0;
758
759 out_free:
760 vfree(cpuid_entries);
761 out:
762 return r;
763 }
764
765 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
766 {
767 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
768 int j, nent = vcpu->arch.cpuid_nent;
769
770 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
771 /* when no next entry is found, the current entry[i] is reselected */
772 for (j = i + 1; ; j = (j + 1) % nent) {
773 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
774 if (ej->function == e->function) {
775 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
776 return j;
777 }
778 }
779 return 0; /* silence gcc, even though control never reaches here */
780 }
781
782 /* find an entry with matching function, matching index (if needed), and that
783 * should be read next (if it's stateful) */
784 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
785 u32 function, u32 index)
786 {
787 if (e->function != function)
788 return 0;
789 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
790 return 0;
791 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
792 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
793 return 0;
794 return 1;
795 }
796
797 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
798 u32 function, u32 index)
799 {
800 int i;
801 struct kvm_cpuid_entry2 *best = NULL;
802
803 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
804 struct kvm_cpuid_entry2 *e;
805
806 e = &vcpu->arch.cpuid_entries[i];
807 if (is_matching_cpuid_entry(e, function, index)) {
808 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
809 move_to_next_stateful_cpuid_entry(vcpu, i);
810 best = e;
811 break;
812 }
813 }
814 return best;
815 }
816 EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
817
818 /*
819 * If no match is found, check whether we exceed the vCPU's limit
820 * and return the content of the highest valid _standard_ leaf instead.
821 * This is to satisfy the CPUID specification.
822 */
823 static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu,
824 u32 function, u32 index)
825 {
826 struct kvm_cpuid_entry2 *maxlevel;
827
828 maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
829 if (!maxlevel || maxlevel->eax >= function)
830 return NULL;
831 if (function & 0x80000000) {
832 maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0);
833 if (!maxlevel)
834 return NULL;
835 }
836 return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index);
837 }
838
839 void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
840 {
841 u32 function = *eax, index = *ecx;
842 struct kvm_cpuid_entry2 *best;
843
844 best = kvm_find_cpuid_entry(vcpu, function, index);
845
846 if (!best)
847 best = check_cpuid_limit(vcpu, function, index);
848
849 /*
850 * Perfmon not yet supported for L2 guest.
851 */
852 if (is_guest_mode(vcpu) && function == 0xa)
853 best = NULL;
854
855 if (best) {
856 *eax = best->eax;
857 *ebx = best->ebx;
858 *ecx = best->ecx;
859 *edx = best->edx;
860 } else
861 *eax = *ebx = *ecx = *edx = 0;
862 trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx);
863 }
864 EXPORT_SYMBOL_GPL(kvm_cpuid);
865
866 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
867 {
868 u32 function, eax, ebx, ecx, edx;
869
870 function = eax = kvm_register_read(vcpu, VCPU_REGS_RAX);
871 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
872 kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx);
873 kvm_register_write(vcpu, VCPU_REGS_RAX, eax);
874 kvm_register_write(vcpu, VCPU_REGS_RBX, ebx);
875 kvm_register_write(vcpu, VCPU_REGS_RCX, ecx);
876 kvm_register_write(vcpu, VCPU_REGS_RDX, edx);
877 kvm_x86_ops->skip_emulated_instruction(vcpu);
878 }
879 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
Linux with added FPC-III support