Commit | Line | Data |
---|---|---|
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 | ||
4344ee98 PB |
26 | static u32 xstate_required_size(u64 xstate_bv) |
27 | { | |
28 | int feature_bit = 0; | |
29 | u32 ret = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; | |
30 | ||
56c103ec | 31 | xstate_bv &= XSTATE_EXTEND_MASK; |
4344ee98 PB |
32 | while (xstate_bv) { |
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); | |
37 | } | |
38 | ||
39 | xstate_bv >>= 1; | |
40 | feature_bit++; | |
41 | } | |
42 | ||
43 | return ret; | |
44 | } | |
45 | ||
00b27a3e AK |
46 | void kvm_update_cpuid(struct kvm_vcpu *vcpu) |
47 | { | |
48 | struct kvm_cpuid_entry2 *best; | |
49 | struct kvm_lapic *apic = vcpu->arch.apic; | |
50 | ||
51 | best = kvm_find_cpuid_entry(vcpu, 1, 0); | |
52 | if (!best) | |
53 | return; | |
54 | ||
55 | /* Update OSXSAVE bit */ | |
56 | if (cpu_has_xsave && best->function == 0x1) { | |
57 | best->ecx &= ~(bit(X86_FEATURE_OSXSAVE)); | |
58 | if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) | |
59 | best->ecx |= bit(X86_FEATURE_OSXSAVE); | |
60 | } | |
61 | ||
62 | if (apic) { | |
63 | if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER)) | |
64 | apic->lapic_timer.timer_mode_mask = 3 << 17; | |
65 | else | |
66 | apic->lapic_timer.timer_mode_mask = 1 << 17; | |
67 | } | |
f5132b01 | 68 | |
d7876f1b | 69 | best = kvm_find_cpuid_entry(vcpu, 0xD, 0); |
4344ee98 | 70 | if (!best) { |
d7876f1b | 71 | vcpu->arch.guest_supported_xcr0 = 0; |
4344ee98 PB |
72 | vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET; |
73 | } else { | |
d7876f1b PB |
74 | vcpu->arch.guest_supported_xcr0 = |
75 | (best->eax | ((u64)best->edx << 32)) & | |
76 | host_xcr0 & KVM_SUPPORTED_XCR0; | |
56c103ec LJ |
77 | vcpu->arch.guest_xstate_size = best->ebx = |
78 | xstate_required_size(vcpu->arch.xcr0); | |
4344ee98 | 79 | } |
d7876f1b | 80 | |
f5132b01 | 81 | kvm_pmu_cpuid_update(vcpu); |
00b27a3e AK |
82 | } |
83 | ||
84 | static int is_efer_nx(void) | |
85 | { | |
86 | unsigned long long efer = 0; | |
87 | ||
88 | rdmsrl_safe(MSR_EFER, &efer); | |
89 | return efer & EFER_NX; | |
90 | } | |
91 | ||
92 | static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) | |
93 | { | |
94 | int i; | |
95 | struct kvm_cpuid_entry2 *e, *entry; | |
96 | ||
97 | entry = NULL; | |
98 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
99 | e = &vcpu->arch.cpuid_entries[i]; | |
100 | if (e->function == 0x80000001) { | |
101 | entry = e; | |
102 | break; | |
103 | } | |
104 | } | |
105 | if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) { | |
106 | entry->edx &= ~(1 << 20); | |
107 | printk(KERN_INFO "kvm: guest NX capability removed\n"); | |
108 | } | |
109 | } | |
110 | ||
111 | /* when an old userspace process fills a new kernel module */ | |
112 | int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, | |
113 | struct kvm_cpuid *cpuid, | |
114 | struct kvm_cpuid_entry __user *entries) | |
115 | { | |
116 | int r, i; | |
117 | struct kvm_cpuid_entry *cpuid_entries; | |
118 | ||
119 | r = -E2BIG; | |
120 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
121 | goto out; | |
122 | r = -ENOMEM; | |
123 | cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); | |
124 | if (!cpuid_entries) | |
125 | goto out; | |
126 | r = -EFAULT; | |
127 | if (copy_from_user(cpuid_entries, entries, | |
128 | cpuid->nent * sizeof(struct kvm_cpuid_entry))) | |
129 | goto out_free; | |
130 | for (i = 0; i < cpuid->nent; i++) { | |
131 | vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; | |
132 | vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; | |
133 | vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; | |
134 | vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; | |
135 | vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; | |
136 | vcpu->arch.cpuid_entries[i].index = 0; | |
137 | vcpu->arch.cpuid_entries[i].flags = 0; | |
138 | vcpu->arch.cpuid_entries[i].padding[0] = 0; | |
139 | vcpu->arch.cpuid_entries[i].padding[1] = 0; | |
140 | vcpu->arch.cpuid_entries[i].padding[2] = 0; | |
141 | } | |
142 | vcpu->arch.cpuid_nent = cpuid->nent; | |
143 | cpuid_fix_nx_cap(vcpu); | |
144 | r = 0; | |
145 | kvm_apic_set_version(vcpu); | |
146 | kvm_x86_ops->cpuid_update(vcpu); | |
147 | kvm_update_cpuid(vcpu); | |
148 | ||
149 | out_free: | |
150 | vfree(cpuid_entries); | |
151 | out: | |
152 | return r; | |
153 | } | |
154 | ||
155 | int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, | |
156 | struct kvm_cpuid2 *cpuid, | |
157 | struct kvm_cpuid_entry2 __user *entries) | |
158 | { | |
159 | int r; | |
160 | ||
161 | r = -E2BIG; | |
162 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
163 | goto out; | |
164 | r = -EFAULT; | |
165 | if (copy_from_user(&vcpu->arch.cpuid_entries, entries, | |
166 | cpuid->nent * sizeof(struct kvm_cpuid_entry2))) | |
167 | goto out; | |
168 | vcpu->arch.cpuid_nent = cpuid->nent; | |
169 | kvm_apic_set_version(vcpu); | |
170 | kvm_x86_ops->cpuid_update(vcpu); | |
171 | kvm_update_cpuid(vcpu); | |
172 | return 0; | |
173 | ||
174 | out: | |
175 | return r; | |
176 | } | |
177 | ||
178 | int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, | |
179 | struct kvm_cpuid2 *cpuid, | |
180 | struct kvm_cpuid_entry2 __user *entries) | |
181 | { | |
182 | int r; | |
183 | ||
184 | r = -E2BIG; | |
185 | if (cpuid->nent < vcpu->arch.cpuid_nent) | |
186 | goto out; | |
187 | r = -EFAULT; | |
188 | if (copy_to_user(entries, &vcpu->arch.cpuid_entries, | |
189 | vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) | |
190 | goto out; | |
191 | return 0; | |
192 | ||
193 | out: | |
194 | cpuid->nent = vcpu->arch.cpuid_nent; | |
195 | return r; | |
196 | } | |
197 | ||
198 | static void cpuid_mask(u32 *word, int wordnum) | |
199 | { | |
200 | *word &= boot_cpu_data.x86_capability[wordnum]; | |
201 | } | |
202 | ||
203 | static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
204 | u32 index) | |
205 | { | |
206 | entry->function = function; | |
207 | entry->index = index; | |
208 | cpuid_count(entry->function, entry->index, | |
209 | &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); | |
210 | entry->flags = 0; | |
211 | } | |
212 | ||
213 | static bool supported_xcr0_bit(unsigned bit) | |
214 | { | |
215 | u64 mask = ((u64)1 << bit); | |
216 | ||
647e23bb | 217 | return mask & KVM_SUPPORTED_XCR0 & host_xcr0; |
00b27a3e AK |
218 | } |
219 | ||
220 | #define F(x) bit(X86_FEATURE_##x) | |
221 | ||
9c15bb1d BP |
222 | static int __do_cpuid_ent_emulated(struct kvm_cpuid_entry2 *entry, |
223 | u32 func, u32 index, int *nent, int maxnent) | |
224 | { | |
84cffe49 BP |
225 | switch (func) { |
226 | case 0: | |
227 | entry->eax = 1; /* only one leaf currently */ | |
228 | ++*nent; | |
229 | break; | |
230 | case 1: | |
231 | entry->ecx = F(MOVBE); | |
232 | ++*nent; | |
233 | break; | |
234 | default: | |
235 | break; | |
236 | } | |
237 | ||
238 | entry->function = func; | |
239 | entry->index = index; | |
240 | ||
9c15bb1d BP |
241 | return 0; |
242 | } | |
243 | ||
244 | static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, | |
245 | u32 index, int *nent, int maxnent) | |
00b27a3e | 246 | { |
831bf664 | 247 | int r; |
00b27a3e AK |
248 | unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
249 | #ifdef CONFIG_X86_64 | |
250 | unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) | |
251 | ? F(GBPAGES) : 0; | |
252 | unsigned f_lm = F(LM); | |
253 | #else | |
254 | unsigned f_gbpages = 0; | |
255 | unsigned f_lm = 0; | |
256 | #endif | |
257 | unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; | |
ad756a16 | 258 | unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0; |
390bd528 LJ |
259 | unsigned f_mpx = kvm_x86_ops->mpx_supported ? |
260 | (kvm_x86_ops->mpx_supported() ? F(MPX) : 0) : 0; | |
00b27a3e AK |
261 | |
262 | /* cpuid 1.edx */ | |
263 | const u32 kvm_supported_word0_x86_features = | |
264 | F(FPU) | F(VME) | F(DE) | F(PSE) | | |
265 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
266 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | | |
267 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
268 | F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) | | |
269 | 0 /* Reserved, DS, ACPI */ | F(MMX) | | |
270 | F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | | |
271 | 0 /* HTT, TM, Reserved, PBE */; | |
272 | /* cpuid 0x80000001.edx */ | |
273 | const u32 kvm_supported_word1_x86_features = | |
274 | F(FPU) | F(VME) | F(DE) | F(PSE) | | |
275 | F(TSC) | F(MSR) | F(PAE) | F(MCE) | | |
276 | F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | | |
277 | F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | | |
278 | F(PAT) | F(PSE36) | 0 /* Reserved */ | | |
279 | f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | | |
280 | F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | | |
281 | 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); | |
282 | /* cpuid 1.ecx */ | |
283 | const u32 kvm_supported_word4_x86_features = | |
284 | F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | | |
285 | 0 /* DS-CPL, VMX, SMX, EST */ | | |
286 | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | | |
fb215366 | 287 | F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | |
ad756a16 | 288 | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | |
00b27a3e AK |
289 | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
290 | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | | |
291 | F(F16C) | F(RDRAND); | |
292 | /* cpuid 0x80000001.ecx */ | |
293 | const u32 kvm_supported_word6_x86_features = | |
294 | F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | | |
295 | F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | | |
2b036c6b | 296 | F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) | |
00b27a3e AK |
297 | 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
298 | ||
299 | /* cpuid 0xC0000001.edx */ | |
300 | const u32 kvm_supported_word5_x86_features = | |
301 | F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | | |
302 | F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | | |
303 | F(PMM) | F(PMM_EN); | |
304 | ||
305 | /* cpuid 7.0.ebx */ | |
306 | const u32 kvm_supported_word9_x86_features = | |
83c52915 | 307 | F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) | |
390bd528 | 308 | F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) | |
49345f13 | 309 | F(ADX); |
00b27a3e AK |
310 | |
311 | /* all calls to cpuid_count() should be made on the same cpu */ | |
312 | get_cpu(); | |
831bf664 SL |
313 | |
314 | r = -E2BIG; | |
315 | ||
316 | if (*nent >= maxnent) | |
317 | goto out; | |
318 | ||
00b27a3e AK |
319 | do_cpuid_1_ent(entry, function, index); |
320 | ++*nent; | |
321 | ||
322 | switch (function) { | |
323 | case 0: | |
324 | entry->eax = min(entry->eax, (u32)0xd); | |
325 | break; | |
326 | case 1: | |
327 | entry->edx &= kvm_supported_word0_x86_features; | |
328 | cpuid_mask(&entry->edx, 0); | |
329 | entry->ecx &= kvm_supported_word4_x86_features; | |
330 | cpuid_mask(&entry->ecx, 4); | |
331 | /* we support x2apic emulation even if host does not support | |
332 | * it since we emulate x2apic in software */ | |
333 | entry->ecx |= F(X2APIC); | |
334 | break; | |
335 | /* function 2 entries are STATEFUL. That is, repeated cpuid commands | |
336 | * may return different values. This forces us to get_cpu() before | |
337 | * issuing the first command, and also to emulate this annoying behavior | |
338 | * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ | |
339 | case 2: { | |
340 | int t, times = entry->eax & 0xff; | |
341 | ||
342 | entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
343 | entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
831bf664 SL |
344 | for (t = 1; t < times; ++t) { |
345 | if (*nent >= maxnent) | |
346 | goto out; | |
347 | ||
00b27a3e AK |
348 | do_cpuid_1_ent(&entry[t], function, 0); |
349 | entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; | |
350 | ++*nent; | |
351 | } | |
352 | break; | |
353 | } | |
354 | /* function 4 has additional index. */ | |
355 | case 4: { | |
356 | int i, cache_type; | |
357 | ||
358 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
359 | /* read more entries until cache_type is zero */ | |
831bf664 SL |
360 | for (i = 1; ; ++i) { |
361 | if (*nent >= maxnent) | |
362 | goto out; | |
363 | ||
00b27a3e AK |
364 | cache_type = entry[i - 1].eax & 0x1f; |
365 | if (!cache_type) | |
366 | break; | |
367 | do_cpuid_1_ent(&entry[i], function, i); | |
368 | entry[i].flags |= | |
369 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
370 | ++*nent; | |
371 | } | |
372 | break; | |
373 | } | |
374 | case 7: { | |
375 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
bbbda795 | 376 | /* Mask ebx against host capability word 9 */ |
00b27a3e AK |
377 | if (index == 0) { |
378 | entry->ebx &= kvm_supported_word9_x86_features; | |
379 | cpuid_mask(&entry->ebx, 9); | |
ba904635 WA |
380 | // TSC_ADJUST is emulated |
381 | entry->ebx |= F(TSC_ADJUST); | |
00b27a3e AK |
382 | } else |
383 | entry->ebx = 0; | |
384 | entry->eax = 0; | |
385 | entry->ecx = 0; | |
386 | entry->edx = 0; | |
387 | break; | |
388 | } | |
389 | case 9: | |
390 | break; | |
a6c06ed1 GN |
391 | case 0xa: { /* Architectural Performance Monitoring */ |
392 | struct x86_pmu_capability cap; | |
393 | union cpuid10_eax eax; | |
394 | union cpuid10_edx edx; | |
395 | ||
396 | perf_get_x86_pmu_capability(&cap); | |
397 | ||
398 | /* | |
399 | * Only support guest architectural pmu on a host | |
400 | * with architectural pmu. | |
401 | */ | |
402 | if (!cap.version) | |
403 | memset(&cap, 0, sizeof(cap)); | |
404 | ||
405 | eax.split.version_id = min(cap.version, 2); | |
406 | eax.split.num_counters = cap.num_counters_gp; | |
407 | eax.split.bit_width = cap.bit_width_gp; | |
408 | eax.split.mask_length = cap.events_mask_len; | |
409 | ||
410 | edx.split.num_counters_fixed = cap.num_counters_fixed; | |
411 | edx.split.bit_width_fixed = cap.bit_width_fixed; | |
412 | edx.split.reserved = 0; | |
413 | ||
414 | entry->eax = eax.full; | |
415 | entry->ebx = cap.events_mask; | |
416 | entry->ecx = 0; | |
417 | entry->edx = edx.full; | |
418 | break; | |
419 | } | |
00b27a3e AK |
420 | /* function 0xb has additional index. */ |
421 | case 0xb: { | |
422 | int i, level_type; | |
423 | ||
424 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
425 | /* read more entries until level_type is zero */ | |
831bf664 SL |
426 | for (i = 1; ; ++i) { |
427 | if (*nent >= maxnent) | |
428 | goto out; | |
429 | ||
00b27a3e AK |
430 | level_type = entry[i - 1].ecx & 0xff00; |
431 | if (!level_type) | |
432 | break; | |
433 | do_cpuid_1_ent(&entry[i], function, i); | |
434 | entry[i].flags |= | |
435 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
436 | ++*nent; | |
437 | } | |
438 | break; | |
439 | } | |
440 | case 0xd: { | |
441 | int idx, i; | |
442 | ||
647e23bb PB |
443 | entry->eax &= host_xcr0 & KVM_SUPPORTED_XCR0; |
444 | entry->edx &= (host_xcr0 & KVM_SUPPORTED_XCR0) >> 32; | |
00b27a3e | 445 | entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
831bf664 SL |
446 | for (idx = 1, i = 1; idx < 64; ++idx) { |
447 | if (*nent >= maxnent) | |
448 | goto out; | |
449 | ||
00b27a3e AK |
450 | do_cpuid_1_ent(&entry[i], function, idx); |
451 | if (entry[i].eax == 0 || !supported_xcr0_bit(idx)) | |
452 | continue; | |
453 | entry[i].flags |= | |
454 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX; | |
455 | ++*nent; | |
456 | ++i; | |
457 | } | |
458 | break; | |
459 | } | |
460 | case KVM_CPUID_SIGNATURE: { | |
326d07cb MK |
461 | static const char signature[12] = "KVMKVMKVM\0\0"; |
462 | const u32 *sigptr = (const u32 *)signature; | |
57c22e5f | 463 | entry->eax = KVM_CPUID_FEATURES; |
00b27a3e AK |
464 | entry->ebx = sigptr[0]; |
465 | entry->ecx = sigptr[1]; | |
466 | entry->edx = sigptr[2]; | |
467 | break; | |
468 | } | |
469 | case KVM_CPUID_FEATURES: | |
470 | entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | | |
471 | (1 << KVM_FEATURE_NOP_IO_DELAY) | | |
472 | (1 << KVM_FEATURE_CLOCKSOURCE2) | | |
473 | (1 << KVM_FEATURE_ASYNC_PF) | | |
ae7a2a3f | 474 | (1 << KVM_FEATURE_PV_EOI) | |
6aef266c SV |
475 | (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) | |
476 | (1 << KVM_FEATURE_PV_UNHALT); | |
00b27a3e AK |
477 | |
478 | if (sched_info_on()) | |
479 | entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); | |
480 | ||
481 | entry->ebx = 0; | |
482 | entry->ecx = 0; | |
483 | entry->edx = 0; | |
484 | break; | |
485 | case 0x80000000: | |
486 | entry->eax = min(entry->eax, 0x8000001a); | |
487 | break; | |
488 | case 0x80000001: | |
489 | entry->edx &= kvm_supported_word1_x86_features; | |
490 | cpuid_mask(&entry->edx, 1); | |
491 | entry->ecx &= kvm_supported_word6_x86_features; | |
492 | cpuid_mask(&entry->ecx, 6); | |
493 | break; | |
494 | case 0x80000008: { | |
495 | unsigned g_phys_as = (entry->eax >> 16) & 0xff; | |
496 | unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); | |
497 | unsigned phys_as = entry->eax & 0xff; | |
498 | ||
499 | if (!g_phys_as) | |
500 | g_phys_as = phys_as; | |
501 | entry->eax = g_phys_as | (virt_as << 8); | |
502 | entry->ebx = entry->edx = 0; | |
503 | break; | |
504 | } | |
505 | case 0x80000019: | |
506 | entry->ecx = entry->edx = 0; | |
507 | break; | |
508 | case 0x8000001a: | |
509 | break; | |
510 | case 0x8000001d: | |
511 | break; | |
512 | /*Add support for Centaur's CPUID instruction*/ | |
513 | case 0xC0000000: | |
514 | /*Just support up to 0xC0000004 now*/ | |
515 | entry->eax = min(entry->eax, 0xC0000004); | |
516 | break; | |
517 | case 0xC0000001: | |
518 | entry->edx &= kvm_supported_word5_x86_features; | |
519 | cpuid_mask(&entry->edx, 5); | |
520 | break; | |
521 | case 3: /* Processor serial number */ | |
522 | case 5: /* MONITOR/MWAIT */ | |
523 | case 6: /* Thermal management */ | |
00b27a3e AK |
524 | case 0x80000007: /* Advanced power management */ |
525 | case 0xC0000002: | |
526 | case 0xC0000003: | |
527 | case 0xC0000004: | |
528 | default: | |
529 | entry->eax = entry->ebx = entry->ecx = entry->edx = 0; | |
530 | break; | |
531 | } | |
532 | ||
533 | kvm_x86_ops->set_supported_cpuid(function, entry); | |
534 | ||
831bf664 SL |
535 | r = 0; |
536 | ||
537 | out: | |
00b27a3e | 538 | put_cpu(); |
831bf664 SL |
539 | |
540 | return r; | |
00b27a3e AK |
541 | } |
542 | ||
9c15bb1d BP |
543 | static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, |
544 | u32 idx, int *nent, int maxnent, unsigned int type) | |
545 | { | |
546 | if (type == KVM_GET_EMULATED_CPUID) | |
547 | return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent); | |
548 | ||
549 | return __do_cpuid_ent(entry, func, idx, nent, maxnent); | |
550 | } | |
551 | ||
00b27a3e AK |
552 | #undef F |
553 | ||
831bf664 SL |
554 | struct kvm_cpuid_param { |
555 | u32 func; | |
556 | u32 idx; | |
557 | bool has_leaf_count; | |
326d07cb | 558 | bool (*qualifier)(const struct kvm_cpuid_param *param); |
831bf664 SL |
559 | }; |
560 | ||
326d07cb | 561 | static bool is_centaur_cpu(const struct kvm_cpuid_param *param) |
831bf664 SL |
562 | { |
563 | return boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR; | |
564 | } | |
565 | ||
9c15bb1d BP |
566 | static bool sanity_check_entries(struct kvm_cpuid_entry2 __user *entries, |
567 | __u32 num_entries, unsigned int ioctl_type) | |
568 | { | |
569 | int i; | |
1b2ca422 | 570 | __u32 pad[3]; |
9c15bb1d BP |
571 | |
572 | if (ioctl_type != KVM_GET_EMULATED_CPUID) | |
573 | return false; | |
574 | ||
575 | /* | |
576 | * We want to make sure that ->padding is being passed clean from | |
577 | * userspace in case we want to use it for something in the future. | |
578 | * | |
579 | * Sadly, this wasn't enforced for KVM_GET_SUPPORTED_CPUID and so we | |
580 | * have to give ourselves satisfied only with the emulated side. /me | |
581 | * sheds a tear. | |
582 | */ | |
583 | for (i = 0; i < num_entries; i++) { | |
1b2ca422 BP |
584 | if (copy_from_user(pad, entries[i].padding, sizeof(pad))) |
585 | return true; | |
586 | ||
587 | if (pad[0] || pad[1] || pad[2]) | |
9c15bb1d BP |
588 | return true; |
589 | } | |
590 | return false; | |
591 | } | |
592 | ||
593 | int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid, | |
594 | struct kvm_cpuid_entry2 __user *entries, | |
595 | unsigned int type) | |
00b27a3e AK |
596 | { |
597 | struct kvm_cpuid_entry2 *cpuid_entries; | |
831bf664 | 598 | int limit, nent = 0, r = -E2BIG, i; |
00b27a3e | 599 | u32 func; |
326d07cb | 600 | static const struct kvm_cpuid_param param[] = { |
831bf664 SL |
601 | { .func = 0, .has_leaf_count = true }, |
602 | { .func = 0x80000000, .has_leaf_count = true }, | |
603 | { .func = 0xC0000000, .qualifier = is_centaur_cpu, .has_leaf_count = true }, | |
604 | { .func = KVM_CPUID_SIGNATURE }, | |
605 | { .func = KVM_CPUID_FEATURES }, | |
606 | }; | |
00b27a3e AK |
607 | |
608 | if (cpuid->nent < 1) | |
609 | goto out; | |
610 | if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) | |
611 | cpuid->nent = KVM_MAX_CPUID_ENTRIES; | |
9c15bb1d BP |
612 | |
613 | if (sanity_check_entries(entries, cpuid->nent, type)) | |
614 | return -EINVAL; | |
615 | ||
00b27a3e | 616 | r = -ENOMEM; |
84cffe49 | 617 | cpuid_entries = vzalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
00b27a3e AK |
618 | if (!cpuid_entries) |
619 | goto out; | |
620 | ||
831bf664 SL |
621 | r = 0; |
622 | for (i = 0; i < ARRAY_SIZE(param); i++) { | |
326d07cb | 623 | const struct kvm_cpuid_param *ent = ¶m[i]; |
00b27a3e | 624 | |
831bf664 SL |
625 | if (ent->qualifier && !ent->qualifier(ent)) |
626 | continue; | |
00b27a3e | 627 | |
831bf664 | 628 | r = do_cpuid_ent(&cpuid_entries[nent], ent->func, ent->idx, |
9c15bb1d | 629 | &nent, cpuid->nent, type); |
00b27a3e | 630 | |
831bf664 | 631 | if (r) |
00b27a3e AK |
632 | goto out_free; |
633 | ||
831bf664 SL |
634 | if (!ent->has_leaf_count) |
635 | continue; | |
636 | ||
00b27a3e | 637 | limit = cpuid_entries[nent - 1].eax; |
831bf664 SL |
638 | for (func = ent->func + 1; func <= limit && nent < cpuid->nent && r == 0; ++func) |
639 | r = do_cpuid_ent(&cpuid_entries[nent], func, ent->idx, | |
9c15bb1d | 640 | &nent, cpuid->nent, type); |
00b27a3e | 641 | |
831bf664 | 642 | if (r) |
00b27a3e AK |
643 | goto out_free; |
644 | } | |
645 | ||
00b27a3e AK |
646 | r = -EFAULT; |
647 | if (copy_to_user(entries, cpuid_entries, | |
648 | nent * sizeof(struct kvm_cpuid_entry2))) | |
649 | goto out_free; | |
650 | cpuid->nent = nent; | |
651 | r = 0; | |
652 | ||
653 | out_free: | |
654 | vfree(cpuid_entries); | |
655 | out: | |
656 | return r; | |
657 | } | |
658 | ||
659 | static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) | |
660 | { | |
661 | struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; | |
662 | int j, nent = vcpu->arch.cpuid_nent; | |
663 | ||
664 | e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; | |
665 | /* when no next entry is found, the current entry[i] is reselected */ | |
666 | for (j = i + 1; ; j = (j + 1) % nent) { | |
667 | struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; | |
668 | if (ej->function == e->function) { | |
669 | ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; | |
670 | return j; | |
671 | } | |
672 | } | |
673 | return 0; /* silence gcc, even though control never reaches here */ | |
674 | } | |
675 | ||
676 | /* find an entry with matching function, matching index (if needed), and that | |
677 | * should be read next (if it's stateful) */ | |
678 | static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, | |
679 | u32 function, u32 index) | |
680 | { | |
681 | if (e->function != function) | |
682 | return 0; | |
683 | if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) | |
684 | return 0; | |
685 | if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && | |
686 | !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) | |
687 | return 0; | |
688 | return 1; | |
689 | } | |
690 | ||
691 | struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu, | |
692 | u32 function, u32 index) | |
693 | { | |
694 | int i; | |
695 | struct kvm_cpuid_entry2 *best = NULL; | |
696 | ||
697 | for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { | |
698 | struct kvm_cpuid_entry2 *e; | |
699 | ||
700 | e = &vcpu->arch.cpuid_entries[i]; | |
701 | if (is_matching_cpuid_entry(e, function, index)) { | |
702 | if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) | |
703 | move_to_next_stateful_cpuid_entry(vcpu, i); | |
704 | best = e; | |
705 | break; | |
706 | } | |
707 | } | |
708 | return best; | |
709 | } | |
710 | EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry); | |
711 | ||
712 | int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) | |
713 | { | |
714 | struct kvm_cpuid_entry2 *best; | |
715 | ||
716 | best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); | |
717 | if (!best || best->eax < 0x80000008) | |
718 | goto not_found; | |
719 | best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); | |
720 | if (best) | |
721 | return best->eax & 0xff; | |
722 | not_found: | |
723 | return 36; | |
724 | } | |
725 | ||
726 | /* | |
727 | * If no match is found, check whether we exceed the vCPU's limit | |
728 | * and return the content of the highest valid _standard_ leaf instead. | |
729 | * This is to satisfy the CPUID specification. | |
730 | */ | |
731 | static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu, | |
732 | u32 function, u32 index) | |
733 | { | |
734 | struct kvm_cpuid_entry2 *maxlevel; | |
735 | ||
736 | maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0); | |
737 | if (!maxlevel || maxlevel->eax >= function) | |
738 | return NULL; | |
739 | if (function & 0x80000000) { | |
740 | maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0); | |
741 | if (!maxlevel) | |
742 | return NULL; | |
743 | } | |
744 | return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index); | |
745 | } | |
746 | ||
62046e5a | 747 | void kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) |
00b27a3e | 748 | { |
62046e5a | 749 | u32 function = *eax, index = *ecx; |
00b27a3e AK |
750 | struct kvm_cpuid_entry2 *best; |
751 | ||
00b27a3e AK |
752 | best = kvm_find_cpuid_entry(vcpu, function, index); |
753 | ||
754 | if (!best) | |
755 | best = check_cpuid_limit(vcpu, function, index); | |
756 | ||
757 | if (best) { | |
62046e5a AK |
758 | *eax = best->eax; |
759 | *ebx = best->ebx; | |
760 | *ecx = best->ecx; | |
761 | *edx = best->edx; | |
762 | } else | |
763 | *eax = *ebx = *ecx = *edx = 0; | |
a9d4e439 | 764 | trace_kvm_cpuid(function, *eax, *ebx, *ecx, *edx); |
62046e5a | 765 | } |
66f7b72e | 766 | EXPORT_SYMBOL_GPL(kvm_cpuid); |
62046e5a AK |
767 | |
768 | void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) | |
769 | { | |
770 | u32 function, eax, ebx, ecx, edx; | |
771 | ||
772 | function = eax = kvm_register_read(vcpu, VCPU_REGS_RAX); | |
773 | ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); | |
774 | kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx); | |
775 | kvm_register_write(vcpu, VCPU_REGS_RAX, eax); | |
776 | kvm_register_write(vcpu, VCPU_REGS_RBX, ebx); | |
777 | kvm_register_write(vcpu, VCPU_REGS_RCX, ecx); | |
778 | kvm_register_write(vcpu, VCPU_REGS_RDX, edx); | |
00b27a3e | 779 | kvm_x86_ops->skip_emulated_instruction(vcpu); |
00b27a3e AK |
780 | } |
781 | EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); |