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Commit | Line | Data |
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00b27a3e AK |
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/module.h> | |
bb5a798a JK |
17 | #include <linux/vmalloc.h> |
18 | #include <linux/uaccess.h> | |
00b27a3e AK |
19 | #include <asm/user.h> |
20 | #include <asm/xsave.h> | |
21 | #include "cpuid.h" | |
22 | #include "lapic.h" | |
23 | #include "mmu.h" | |
24 | #include "trace.h" | |
25 | ||
26 | void kvm_update_cpuid(struct kvm_vcpu *vcpu) | |
27 | { | |
28 | struct kvm_cpuid_entry2 *best; | |
29 | struct kvm_lapic *apic = vcpu->arch.apic; | |
30 | ||
31 | best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
32 | if (!best) | |
33 | return; | |
34 | ||
35 | /* Update OSXSAVE bit */ | |
36 | if (cpu_has_xsave && best->function == 0x1) { | |
37 | best->ecx &= ~(bit(X86_FEATURE_OSXSAVE)); | |
38 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) | |
39 | best->ecx |= bit(X86_FEATURE_OSXSAVE); | |
40 | } | |
41 | ||
42 | if (apic) { | |
43 | if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER)) | |
44 | apic->lapic_timer.timer_mode_mask = 3 << 17; | |
45 | else | |
46 | apic->lapic_timer.timer_mode_mask = 1 << 17; | |
47 | } | |
f5132b01 GN |
48 | |
49 | kvm_pmu_cpuid_update(vcpu); | |
00b27a3e AK |
50 | } |
51 | ||
52 | static int is_efer_nx(void) | |
53 | { | |
54 | unsigned long long efer = 0; | |
55 | ||
56 | rdmsrl_safe(MSR_EFER, &efer); | |
57 | return efer & EFER_NX; | |
58 | } | |
59 | ||
60 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
61 | { | |
62 | int i; | |
63 | struct kvm_cpuid_entry2 *e, *entry; | |
64 | ||
65 | entry = NULL; | |
66 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
67 | e = &vcpu->arch.cpuid_entries[i]; | |
68 | if (e->function == 0x80000001) { | |
69 | entry = e; | |
70 | break; | |
71 | } | |
72 | } | |
73 | if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) { | |
74 | entry->edx &= ~(1 << 20); | |
75 | printk(KERN_INFO "kvm: guest NX capability removed\n"); | |
76 | } | |
77 | } | |
78 | ||
79 | /* when an old userspace process fills a new kernel module */ | |
80 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
81 | struct kvm_cpuid *cpuid, | |
82 | struct kvm_cpuid_entry __user *entries) | |
83 | { | |
84 | int r, i; | |
85 | struct kvm_cpuid_entry *cpuid_entries; | |
86 | ||
87 | r = -E2BIG; | |
88 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
89 | goto out; | |
90 | r = -ENOMEM; | |
91 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); | |
92 | if (!cpuid_entries) | |
93 | goto out; | |
94 | r = -EFAULT; | |
95 | if (copy_from_user(cpuid_entries, entries, | |
96 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
97 | goto out_free; | |
98 | for (i = 0; i < cpuid->nent; i++) { | |
99 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
100 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
101 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
102 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
103 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
104 | vcpu->arch.cpuid_entries[i].index = 0; | |
105 | vcpu->arch.cpuid_entries[i].flags = 0; | |
106 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
107 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
108 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
109 | } | |
110 | vcpu->arch.cpuid_nent = cpuid->nent; | |
111 | cpuid_fix_nx_cap(vcpu); | |
112 | r = 0; | |
113 | kvm_apic_set_version(vcpu); | |
114 | kvm_x86_ops->cpuid_update(vcpu); | |
115 | kvm_update_cpuid(vcpu); | |
116 | ||
117 | out_free: | |
118 | vfree(cpuid_entries); | |
119 | out: | |
120 | return r; | |
121 | } | |
122 | ||
123 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
124 | struct kvm_cpuid2 *cpuid, | |
125 | struct kvm_cpuid_entry2 __user *entries) | |
126 | { | |
127 | int r; | |
128 | ||
129 | r = -E2BIG; | |
130 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
131 | goto out; | |
132 | r = -EFAULT; | |
133 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
134 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
135 | goto out; | |
136 | vcpu->arch.cpuid_nent = cpuid->nent; | |
137 | kvm_apic_set_version(vcpu); | |
138 | kvm_x86_ops->cpuid_update(vcpu); | |
139 | kvm_update_cpuid(vcpu); | |
140 | return 0; | |
141 | ||
142 | out: | |
143 | return r; | |
144 | } | |
145 | ||
146 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
147 | struct kvm_cpuid2 *cpuid, | |
148 | struct kvm_cpuid_entry2 __user *entries) | |
149 | { | |
150 | int r; | |
151 | ||
152 | r = -E2BIG; | |
153 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
154 | goto out; | |
155 | r = -EFAULT; | |
156 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
157 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
158 | goto out; | |
159 | return 0; | |
160 | ||
161 | out: | |
162 | cpuid->nent = vcpu->arch.cpuid_nent; | |
163 | return r; | |
164 | } | |
165 | ||
166 | static void cpuid_mask(u32 *word, int wordnum) | |
167 | { | |
168 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
169 | } | |
170 | ||
171 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
172 | u32 index) | |
173 | { | |
174 | entry->function = function; | |
175 | entry->index = index; | |
176 | cpuid_count(entry->function, entry->index, | |
177 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
178 | entry->flags = 0; | |
179 | } | |
180 | ||
181 | static bool supported_xcr0_bit(unsigned bit) | |
182 | { | |
183 | u64 mask = ((u64)1 << bit); | |
184 | ||
185 | return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0; | |
186 | } | |
187 | ||
188 | #define F(x) bit(X86_FEATURE_##x) | |
189 | ||
831bf664 | 190 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, |
00b27a3e AK |
191 | u32 index, int *nent, int maxnent) |
192 | { | |
831bf664 | 193 | int r; |
00b27a3e AK |
194 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
195 | #ifdef CONFIG_X86_64 | |
196 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
197 | ? F(GBPAGES) : 0; | |
198 | unsigned f_lm = F(LM); | |
199 | #else | |
200 | unsigned f_gbpages = 0; | |
201 | unsigned f_lm = 0; | |
202 | #endif | |
203 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
204 | ||
205 | /* cpuid 1.edx */ | |
206 | const u32 kvm_supported_word0_x86_features = | |
207 | F(FPU) | F(VME) | F(DE) | F(PSE) | | |
208 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
209 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
210 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
211 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) | | |
212 | 0 /* Reserved, DS, ACPI */ | F(MMX) | | |
213 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
214 | 0 /* HTT, TM, Reserved, PBE */; | |
215 | /* cpuid 0x80000001.edx */ | |
216 | const u32 kvm_supported_word1_x86_features = | |
217 | F(FPU) | F(VME) | F(DE) | F(PSE) | | |
218 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
219 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
220 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
221 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
222 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
223 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
224 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
225 | /* cpuid 1.ecx */ | |
226 | const u32 kvm_supported_word4_x86_features = | |
227 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | | |
228 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
229 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 230 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
00b27a3e AK |
231 | 0 /* Reserved, DCA */ | F(XMM4_1) | |
232 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | | |
233 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
234 | F(F16C) | F(RDRAND); | |
235 | /* cpuid 0x80000001.ecx */ | |
236 | const u32 kvm_supported_word6_x86_features = | |
237 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | | |
238 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 239 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
00b27a3e AK |
240 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
241 | ||
242 | /* cpuid 0xC0000001.edx */ | |
243 | const u32 kvm_supported_word5_x86_features = | |
244 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | | |
245 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
246 | F(PMM) | F(PMM_EN); | |
247 | ||
248 | /* cpuid 7.0.ebx */ | |
249 | const u32 kvm_supported_word9_x86_features = | |
fb215366 | 250 | F(FSGSBASE) | F(BMI1) | F(AVX2) | F(SMEP) | F(BMI2) | F(ERMS); |
00b27a3e AK |
251 | |
252 | /* all calls to cpuid_count() should be made on the same cpu */ | |
253 | get_cpu(); | |
831bf664 SL |
254 | |
255 | r = -E2BIG; | |
256 | ||
257 | if (*nent >= maxnent) | |
258 | goto out; | |
259 | ||
00b27a3e AK |
260 | do_cpuid_1_ent(entry, function, index); |
261 | ++*nent; | |
262 | ||
263 | switch (function) { | |
264 | case 0: | |
265 | entry->eax = min(entry->eax, (u32)0xd); | |
266 | break; | |
267 | case 1: | |
268 | entry->edx &= kvm_supported_word0_x86_features; | |
269 | cpuid_mask(&entry->edx, 0); | |
270 | entry->ecx &= kvm_supported_word4_x86_features; | |
271 | cpuid_mask(&entry->ecx, 4); | |
272 | /* we support x2apic emulation even if host does not support | |
273 | * it since we emulate x2apic in software */ | |
274 | entry->ecx |= F(X2APIC); | |
275 | break; | |
276 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
277 | * may return different values. This forces us to get_cpu() before | |
278 | * issuing the first command, and also to emulate this annoying behavior | |
279 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
280 | case 2: { | |
281 | int t, times = entry->eax & 0xff; | |
282 | ||
283 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
284 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
285 | for (t = 1; t < times; ++t) { |
286 | if (*nent >= maxnent) | |
287 | goto out; | |
288 | ||
00b27a3e AK |
289 | do_cpuid_1_ent(&entry[t], function, 0); |
290 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
291 | ++*nent; | |
292 | } | |
293 | break; | |
294 | } | |
295 | /* function 4 has additional index. */ | |
296 | case 4: { | |
297 | int i, cache_type; | |
298 | ||
299 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
300 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
301 | for (i = 1; ; ++i) { |
302 | if (*nent >= maxnent) | |
303 | goto out; | |
304 | ||
00b27a3e AK |
305 | cache_type = entry[i - 1].eax & 0x1f; |
306 | if (!cache_type) | |
307 | break; | |
308 | do_cpuid_1_ent(&entry[i], function, i); | |
309 | entry[i].flags |= | |
310 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
311 | ++*nent; | |
312 | } | |
313 | break; | |
314 | } | |
315 | case 7: { | |
316 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
317 | /* Mask ebx against host capbability word 9 */ | |
318 | if (index == 0) { | |
319 | entry->ebx &= kvm_supported_word9_x86_features; | |
320 | cpuid_mask(&entry->ebx, 9); | |
321 | } else | |
322 | entry->ebx = 0; | |
323 | entry->eax = 0; | |
324 | entry->ecx = 0; | |
325 | entry->edx = 0; | |
326 | break; | |
327 | } | |
328 | case 9: | |
329 | break; | |
a6c06ed1 GN |
330 | case 0xa: { /* Architectural Performance Monitoring */ |
331 | struct x86_pmu_capability cap; | |
332 | union cpuid10_eax eax; | |
333 | union cpuid10_edx edx; | |
334 | ||
335 | perf_get_x86_pmu_capability(&cap); | |
336 | ||
337 | /* | |
338 | * Only support guest architectural pmu on a host | |
339 | * with architectural pmu. | |
340 | */ | |
341 | if (!cap.version) | |
342 | memset(&cap, 0, sizeof(cap)); | |
343 | ||
344 | eax.split.version_id = min(cap.version, 2); | |
345 | eax.split.num_counters = cap.num_counters_gp; | |
346 | eax.split.bit_width = cap.bit_width_gp; | |
347 | eax.split.mask_length = cap.events_mask_len; | |
348 | ||
349 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
350 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
351 | edx.split.reserved = 0; | |
352 | ||
353 | entry->eax = eax.full; | |
354 | entry->ebx = cap.events_mask; | |
355 | entry->ecx = 0; | |
356 | entry->edx = edx.full; | |
357 | break; | |
358 | } | |
00b27a3e AK |
359 | /* function 0xb has additional index. */ |
360 | case 0xb: { | |
361 | int i, level_type; | |
362 | ||
363 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
364 | /* read more entries until level_type is zero */ | |
831bf664 SL |
365 | for (i = 1; ; ++i) { |
366 | if (*nent >= maxnent) | |
367 | goto out; | |
368 | ||
00b27a3e AK |
369 | level_type = entry[i - 1].ecx & 0xff00; |
370 | if (!level_type) | |
371 | break; | |
372 | do_cpuid_1_ent(&entry[i], function, i); | |
373 | entry[i].flags |= | |
374 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
375 | ++*nent; | |
376 | } | |
377 | break; | |
378 | } | |
379 | case 0xd: { | |
380 | int idx, i; | |
381 | ||
382 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
831bf664 SL |
383 | for (idx = 1, i = 1; idx < 64; ++idx) { |
384 | if (*nent >= maxnent) | |
385 | goto out; | |
386 | ||
00b27a3e AK |
387 | do_cpuid_1_ent(&entry[i], function, idx); |
388 | if (entry[i].eax == 0 || !supported_xcr0_bit(idx)) | |
389 | continue; | |
390 | entry[i].flags |= | |
391 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
392 | ++*nent; | |
393 | ++i; | |
394 | } | |
395 | break; | |
396 | } | |
397 | case KVM_CPUID_SIGNATURE: { | |
398 | char signature[12] = "KVMKVMKVM\0\0"; | |
399 | u32 *sigptr = (u32 *)signature; | |
400 | entry->eax = 0; | |
401 | entry->ebx = sigptr[0]; | |
402 | entry->ecx = sigptr[1]; | |
403 | entry->edx = sigptr[2]; | |
404 | break; | |
405 | } | |
406 | case KVM_CPUID_FEATURES: | |
407 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
408 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
409 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
410 | (1 << KVM_FEATURE_ASYNC_PF) | | |
411 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT); | |
412 | ||
413 | if (sched_info_on()) | |
414 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
415 | ||
416 | entry->ebx = 0; | |
417 | entry->ecx = 0; | |
418 | entry->edx = 0; | |
419 | break; | |
420 | case 0x80000000: | |
421 | entry->eax = min(entry->eax, 0x8000001a); | |
422 | break; | |
423 | case 0x80000001: | |
424 | entry->edx &= kvm_supported_word1_x86_features; | |
425 | cpuid_mask(&entry->edx, 1); | |
426 | entry->ecx &= kvm_supported_word6_x86_features; | |
427 | cpuid_mask(&entry->ecx, 6); | |
428 | break; | |
429 | case 0x80000008: { | |
430 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
431 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
432 | unsigned phys_as = entry->eax & 0xff; | |
433 | ||
434 | if (!g_phys_as) | |
435 | g_phys_as = phys_as; | |
436 | entry->eax = g_phys_as | (virt_as << 8); | |
437 | entry->ebx = entry->edx = 0; | |
438 | break; | |
439 | } | |
440 | case 0x80000019: | |
441 | entry->ecx = entry->edx = 0; | |
442 | break; | |
443 | case 0x8000001a: | |
444 | break; | |
445 | case 0x8000001d: | |
446 | break; | |
447 | /*Add support for Centaur's CPUID instruction*/ | |
448 | case 0xC0000000: | |
449 | /*Just support up to 0xC0000004 now*/ | |
450 | entry->eax = min(entry->eax, 0xC0000004); | |
451 | break; | |
452 | case 0xC0000001: | |
453 | entry->edx &= kvm_supported_word5_x86_features; | |
454 | cpuid_mask(&entry->edx, 5); | |
455 | break; | |
456 | case 3: /* Processor serial number */ | |
457 | case 5: /* MONITOR/MWAIT */ | |
458 | case 6: /* Thermal management */ | |
00b27a3e AK |
459 | case 0x80000007: /* Advanced power management */ |
460 | case 0xC0000002: | |
461 | case 0xC0000003: | |
462 | case 0xC0000004: | |
463 | default: | |
464 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
465 | break; | |
466 | } | |
467 | ||
468 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
469 | ||
831bf664 SL |
470 | r = 0; |
471 | ||
472 | out: | |
00b27a3e | 473 | put_cpu(); |
831bf664 SL |
474 | |
475 | return r; | |
00b27a3e AK |
476 | } |
477 | ||
478 | #undef F | |
479 | ||
831bf664 SL |
480 | struct kvm_cpuid_param { |
481 | u32 func; | |
482 | u32 idx; | |
483 | bool has_leaf_count; | |
484 | bool (*qualifier)(struct kvm_cpuid_param *param); | |
485 | }; | |
486 | ||
487 | static bool is_centaur_cpu(struct kvm_cpuid_param *param) | |
488 | { | |
489 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
490 | } | |
491 | ||
00b27a3e AK |
492 | int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, |
493 | struct kvm_cpuid_entry2 __user *entries) | |
494 | { | |
495 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 496 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 497 | u32 func; |
831bf664 SL |
498 | static struct kvm_cpuid_param param[] = { |
499 | { .func = 0, .has_leaf_count = true }, | |
500 | { .func = 0x80000000, .has_leaf_count = true }, | |
501 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
502 | { .func = KVM_CPUID_SIGNATURE }, | |
503 | { .func = KVM_CPUID_FEATURES }, | |
504 | }; | |
00b27a3e AK |
505 | |
506 | if (cpuid->nent < 1) | |
507 | goto out; | |
508 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
509 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
510 | r = -ENOMEM; | |
511 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); | |
512 | if (!cpuid_entries) | |
513 | goto out; | |
514 | ||
831bf664 SL |
515 | r = 0; |
516 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
517 | struct kvm_cpuid_param *ent = ¶m[i]; | |
00b27a3e | 518 | |
831bf664 SL |
519 | if (ent->qualifier && !ent->qualifier(ent)) |
520 | continue; | |
00b27a3e | 521 | |
831bf664 | 522 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
00b27a3e AK |
523 | &nent, cpuid->nent); |
524 | ||
831bf664 | 525 | if (r) |
00b27a3e AK |
526 | goto out_free; |
527 | ||
831bf664 SL |
528 | if (!ent->has_leaf_count) |
529 | continue; | |
530 | ||
00b27a3e | 531 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
532 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
533 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
534 | &nent, cpuid->nent); | |
00b27a3e | 535 | |
831bf664 | 536 | if (r) |
00b27a3e AK |
537 | goto out_free; |
538 | } | |
539 | ||
00b27a3e AK |
540 | r = -EFAULT; |
541 | if (copy_to_user(entries, cpuid_entries, | |
542 | nent * sizeof(struct kvm_cpuid_entry2))) | |
543 | goto out_free; | |
544 | cpuid->nent = nent; | |
545 | r = 0; | |
546 | ||
547 | out_free: | |
548 | vfree(cpuid_entries); | |
549 | out: | |
550 | return r; | |
551 | } | |
552 | ||
553 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
554 | { | |
555 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
556 | int j, nent = vcpu->arch.cpuid_nent; | |
557 | ||
558 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
559 | /* when no next entry is found, the current entry[i] is reselected */ | |
560 | for (j = i + 1; ; j = (j + 1) % nent) { | |
561 | struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; | |
562 | if (ej->function == e->function) { | |
563 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
564 | return j; | |
565 | } | |
566 | } | |
567 | return 0; /* silence gcc, even though control never reaches here */ | |
568 | } | |
569 | ||
570 | /* find an entry with matching function, matching index (if needed), and that | |
571 | * should be read next (if it's stateful) */ | |
572 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
573 | u32 function, u32 index) | |
574 | { | |
575 | if (e->function != function) | |
576 | return 0; | |
577 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
578 | return 0; | |
579 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
580 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
581 | return 0; | |
582 | return 1; | |
583 | } | |
584 | ||
585 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
586 | u32 function, u32 index) | |
587 | { | |
588 | int i; | |
589 | struct kvm_cpuid_entry2 *best = NULL; | |
590 | ||
591 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
592 | struct kvm_cpuid_entry2 *e; | |
593 | ||
594 | e = &vcpu->arch.cpuid_entries[i]; | |
595 | if (is_matching_cpuid_entry(e, function, index)) { | |
596 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
597 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
598 | best = e; | |
599 | break; | |
600 | } | |
601 | } | |
602 | return best; | |
603 | } | |
604 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
605 | ||
606 | int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) | |
607 | { | |
608 | struct kvm_cpuid_entry2 *best; | |
609 | ||
610 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); | |
611 | if (!best || best->eax < 0x80000008) | |
612 | goto not_found; | |
613 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
614 | if (best) | |
615 | return best->eax & 0xff; | |
616 | not_found: | |
617 | return 36; | |
618 | } | |
619 | ||
620 | /* | |
621 | * If no match is found, check whether we exceed the vCPU's limit | |
622 | * and return the content of the highest valid _standard_ leaf instead. | |
623 | * This is to satisfy the CPUID specification. | |
624 | */ | |
625 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
626 | u32 function, u32 index) | |
627 | { | |
628 | struct kvm_cpuid_entry2 *maxlevel; | |
629 | ||
630 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
631 | if (!maxlevel || maxlevel->eax >= function) | |
632 | return NULL; | |
633 | if (function & 0x80000000) { | |
634 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
635 | if (!maxlevel) | |
636 | return NULL; | |
637 | } | |
638 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
639 | } | |
640 | ||
641 | void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) | |
642 | { | |
643 | u32 function, index; | |
644 | struct kvm_cpuid_entry2 *best; | |
645 | ||
646 | function = kvm_register_read(vcpu, VCPU_REGS_RAX); | |
647 | index = kvm_register_read(vcpu, VCPU_REGS_RCX); | |
648 | kvm_register_write(vcpu, VCPU_REGS_RAX, 0); | |
649 | kvm_register_write(vcpu, VCPU_REGS_RBX, 0); | |
650 | kvm_register_write(vcpu, VCPU_REGS_RCX, 0); | |
651 | kvm_register_write(vcpu, VCPU_REGS_RDX, 0); | |
652 | best = kvm_find_cpuid_entry(vcpu, function, index); | |
653 | ||
654 | if (!best) | |
655 | best = check_cpuid_limit(vcpu, function, index); | |
656 | ||
657 | if (best) { | |
658 | kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax); | |
659 | kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx); | |
660 | kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx); | |
661 | kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx); | |
662 | } | |
663 | kvm_x86_ops->skip_emulated_instruction(vcpu); | |
664 | trace_kvm_cpuid(function, | |
665 | kvm_register_read(vcpu, VCPU_REGS_RAX), | |
666 | kvm_register_read(vcpu, VCPU_REGS_RBX), | |
667 | kvm_register_read(vcpu, VCPU_REGS_RCX), | |
668 | kvm_register_read(vcpu, VCPU_REGS_RDX)); | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |