xref: /illumos-kvm-cmd/target-i386/cpuid.c (revision 68396ea9)
1 /*
2  *  i386 CPUID helper functions
3  *
4  *  Copyright (c) 2003 Fabrice Bellard
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18  */
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include <string.h>
22 #include <inttypes.h>
23 
24 #include "cpu.h"
25 #include "kvm.h"
26 
27 #include "qemu-option.h"
28 #include "qemu-config.h"
29 
30 /* feature flags taken from "Intel Processor Identification and the CPUID
31  * Instruction" and AMD's "CPUID Specification".  In cases of disagreement
32  * between feature naming conventions, aliases may be added.
33  */
34 static const char *feature_name[] = {
35     "fpu", "vme", "de", "pse",
36     "tsc", "msr", "pae", "mce",
37     "cx8", "apic", NULL, "sep",
38     "mtrr", "pge", "mca", "cmov",
39     "pat", "pse36", "pn" /* Intel psn */, "clflush" /* Intel clfsh */,
40     NULL, "ds" /* Intel dts */, "acpi", "mmx",
41     "fxsr", "sse", "sse2", "ss",
42     "ht" /* Intel htt */, "tm", "ia64", "pbe",
43 };
44 static const char *ext_feature_name[] = {
45     "pni|sse3" /* Intel,AMD sse3 */, "pclmuldq", "dtes64", "monitor",
46     "ds_cpl", "vmx", "smx", "est",
47     "tm2", "ssse3", "cid", NULL,
48     "fma", "cx16", "xtpr", "pdcm",
49     NULL, NULL, "dca", "sse4.1|sse4_1",
50     "sse4.2|sse4_2", "x2apic", "movbe", "popcnt",
51     NULL, "aes", "xsave", "osxsave",
52     "avx", NULL, NULL, "hypervisor",
53 };
54 static const char *ext2_feature_name[] = {
55     "fpu", "vme", "de", "pse",
56     "tsc", "msr", "pae", "mce",
57     "cx8" /* AMD CMPXCHG8B */, "apic", NULL, "syscall",
58     "mtrr", "pge", "mca", "cmov",
59     "pat", "pse36", NULL, NULL /* Linux mp */,
60     "nx" /* Intel xd */, NULL, "mmxext", "mmx",
61     "fxsr", "fxsr_opt" /* AMD ffxsr */, "pdpe1gb" /* AMD Page1GB */, "rdtscp",
62     NULL, "lm" /* Intel 64 */, "3dnowext", "3dnow",
63 };
64 static const char *ext3_feature_name[] = {
65     "lahf_lm" /* AMD LahfSahf */, "cmp_legacy", "svm", "extapic" /* AMD ExtApicSpace */,
66     "cr8legacy" /* AMD AltMovCr8 */, "abm", "sse4a", "misalignsse",
67     "3dnowprefetch", "osvw", "ibs", "xop",
68     "skinit", "wdt", NULL, NULL,
69     "fma4", NULL, "cvt16", "nodeid_msr",
70     NULL, NULL, NULL, NULL,
71     NULL, NULL, NULL, NULL,
72     NULL, NULL, NULL, NULL,
73 };
74 
75 static const char *kvm_feature_name[] = {
76     "kvmclock", "kvm_nopiodelay", "kvm_mmu", NULL, "kvm_asyncpf", NULL, NULL, NULL,
77     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
78     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
79     NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
80 };
81 
82 static const char *svm_feature_name[] = {
83     "npt", "lbrv", "svm_lock", "nrip_save",
84     "tsc_scale", "vmcb_clean",  "flushbyasid", "decodeassists",
85     NULL, NULL, "pause_filter", NULL,
86     "pfthreshold", NULL, NULL, NULL,
87     NULL, NULL, NULL, NULL,
88     NULL, NULL, NULL, NULL,
89     NULL, NULL, NULL, NULL,
90     NULL, NULL, NULL, NULL,
91 };
92 
93 /* collects per-function cpuid data
94  */
95 typedef struct model_features_t {
96     uint32_t *guest_feat;
97     uint32_t *host_feat;
98     uint32_t check_feat;
99     const char **flag_names;
100     uint32_t cpuid;
101     } model_features_t;
102 
103 int check_cpuid = 0;
104 int enforce_cpuid = 0;
105 
host_cpuid(uint32_t function,uint32_t count,uint32_t * eax,uint32_t * ebx,uint32_t * ecx,uint32_t * edx)106 void host_cpuid(uint32_t function, uint32_t count,
107                 uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
108 {
109 #if defined(CONFIG_KVM)
110     uint32_t vec[4];
111 
112 #ifdef __x86_64__
113     asm volatile("cpuid"
114                  : "=a"(vec[0]), "=b"(vec[1]),
115                    "=c"(vec[2]), "=d"(vec[3])
116                  : "0"(function), "c"(count) : "cc");
117 #else
118     asm volatile("pusha \n\t"
119                  "cpuid \n\t"
120                  "mov %%eax, 0(%2) \n\t"
121                  "mov %%ebx, 4(%2) \n\t"
122                  "mov %%ecx, 8(%2) \n\t"
123                  "mov %%edx, 12(%2) \n\t"
124                  "popa"
125                  : : "a"(function), "c"(count), "S"(vec)
126                  : "memory", "cc");
127 #endif
128 
129     if (eax)
130         *eax = vec[0];
131     if (ebx)
132         *ebx = vec[1];
133     if (ecx)
134         *ecx = vec[2];
135     if (edx)
136         *edx = vec[3];
137 #endif
138 }
139 
140 #define iswhite(c) ((c) && ((c) <= ' ' || '~' < (c)))
141 
142 /* general substring compare of *[s1..e1) and *[s2..e2).  sx is start of
143  * a substring.  ex if !NULL points to the first char after a substring,
144  * otherwise the string is assumed to sized by a terminating nul.
145  * Return lexical ordering of *s1:*s2.
146  */
sstrcmp(const char * s1,const char * e1,const char * s2,const char * e2)147 static int sstrcmp(const char *s1, const char *e1, const char *s2,
148     const char *e2)
149 {
150     for (;;) {
151         if (!*s1 || !*s2 || *s1 != *s2)
152             return (*s1 - *s2);
153         ++s1, ++s2;
154         if (s1 == e1 && s2 == e2)
155             return (0);
156         else if (s1 == e1)
157             return (*s2);
158         else if (s2 == e2)
159             return (*s1);
160     }
161 }
162 
163 /* compare *[s..e) to *altstr.  *altstr may be a simple string or multiple
164  * '|' delimited (possibly empty) strings in which case search for a match
165  * within the alternatives proceeds left to right.  Return 0 for success,
166  * non-zero otherwise.
167  */
altcmp(const char * s,const char * e,const char * altstr)168 static int altcmp(const char *s, const char *e, const char *altstr)
169 {
170     const char *p, *q;
171 
172     for (q = p = altstr; ; ) {
173         while (*p && *p != '|')
174             ++p;
175         if ((q == p && !*s) || (q != p && !sstrcmp(s, e, q, p)))
176             return (0);
177         if (!*p)
178             return (1);
179         else
180             q = ++p;
181     }
182 }
183 
184 /* search featureset for flag *[s..e), if found set corresponding bit in
185  * *pval and return success, otherwise return zero
186  */
lookup_feature(uint32_t * pval,const char * s,const char * e,const char ** featureset)187 static int lookup_feature(uint32_t *pval, const char *s, const char *e,
188     const char **featureset)
189 {
190     uint32_t mask;
191     const char **ppc;
192 
193     for (mask = 1, ppc = featureset; mask; mask <<= 1, ++ppc)
194         if (*ppc && !altcmp(s, e, *ppc)) {
195             *pval |= mask;
196             break;
197         }
198     return (mask ? 1 : 0);
199 }
200 
add_flagname_to_bitmaps(const char * flagname,uint32_t * features,uint32_t * ext_features,uint32_t * ext2_features,uint32_t * ext3_features,uint32_t * kvm_features,uint32_t * svm_features)201 static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features,
202                                     uint32_t *ext_features,
203                                     uint32_t *ext2_features,
204                                     uint32_t *ext3_features,
205                                     uint32_t *kvm_features,
206                                     uint32_t *svm_features)
207 {
208     if (!lookup_feature(features, flagname, NULL, feature_name) &&
209         !lookup_feature(ext_features, flagname, NULL, ext_feature_name) &&
210         !lookup_feature(ext2_features, flagname, NULL, ext2_feature_name) &&
211         !lookup_feature(ext3_features, flagname, NULL, ext3_feature_name) &&
212         !lookup_feature(kvm_features, flagname, NULL, kvm_feature_name) &&
213         !lookup_feature(svm_features, flagname, NULL, svm_feature_name))
214             fprintf(stderr, "CPU feature %s not found\n", flagname);
215 }
216 
217 typedef struct x86_def_t {
218     struct x86_def_t *next;
219     const char *name;
220     uint32_t level;
221     uint32_t vendor1, vendor2, vendor3;
222     int family;
223     int model;
224     int stepping;
225     uint32_t features, ext_features, ext2_features, ext3_features;
226     uint32_t kvm_features, svm_features;
227     uint32_t xlevel;
228     char model_id[48];
229     int vendor_override;
230     uint32_t flags;
231 } x86_def_t;
232 
233 #define I486_FEATURES (CPUID_FP87 | CPUID_VME | CPUID_PSE)
234 #define PENTIUM_FEATURES (I486_FEATURES | CPUID_DE | CPUID_TSC | \
235           CPUID_MSR | CPUID_MCE | CPUID_CX8 | CPUID_MMX | CPUID_APIC)
236 #define PENTIUM2_FEATURES (PENTIUM_FEATURES | CPUID_PAE | CPUID_SEP | \
237           CPUID_MTRR | CPUID_PGE | CPUID_MCA | CPUID_CMOV | CPUID_PAT | \
238           CPUID_PSE36 | CPUID_FXSR)
239 #define PENTIUM3_FEATURES (PENTIUM2_FEATURES | CPUID_SSE)
240 #define PPRO_FEATURES (CPUID_FP87 | CPUID_DE | CPUID_PSE | CPUID_TSC | \
241           CPUID_MSR | CPUID_MCE | CPUID_CX8 | CPUID_PGE | CPUID_CMOV | \
242           CPUID_PAT | CPUID_FXSR | CPUID_MMX | CPUID_SSE | CPUID_SSE2 | \
243           CPUID_PAE | CPUID_SEP | CPUID_APIC)
244 #define EXT2_FEATURE_MASK 0x0183F3FF
245 
246 #define TCG_FEATURES (CPUID_FP87 | CPUID_PSE | CPUID_TSC | CPUID_MSR | \
247           CPUID_PAE | CPUID_MCE | CPUID_CX8 | CPUID_APIC | CPUID_SEP | \
248           CPUID_MTRR | CPUID_PGE | CPUID_MCA | CPUID_CMOV | CPUID_PAT | \
249           CPUID_PSE36 | CPUID_CLFLUSH | CPUID_ACPI | CPUID_MMX | \
250           CPUID_FXSR | CPUID_SSE | CPUID_SSE2 | CPUID_SS)
251           /* partly implemented:
252           CPUID_MTRR, CPUID_MCA, CPUID_CLFLUSH (needed for Win64)
253           CPUID_PSE36 (needed for Solaris) */
254           /* missing:
255           CPUID_VME, CPUID_DTS, CPUID_SS, CPUID_HT, CPUID_TM, CPUID_PBE */
256 #define TCG_EXT_FEATURES (CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | \
257           CPUID_EXT_CX16 | CPUID_EXT_POPCNT | \
258           CPUID_EXT_HYPERVISOR)
259           /* missing:
260           CPUID_EXT_DTES64, CPUID_EXT_DSCPL, CPUID_EXT_VMX, CPUID_EXT_EST,
261           CPUID_EXT_TM2, CPUID_EXT_XTPR, CPUID_EXT_PDCM, CPUID_EXT_XSAVE */
262 #define TCG_EXT2_FEATURES ((TCG_FEATURES & EXT2_FEATURE_MASK) | \
263           CPUID_EXT2_NX | CPUID_EXT2_MMXEXT | CPUID_EXT2_RDTSCP | \
264           CPUID_EXT2_3DNOW | CPUID_EXT2_3DNOWEXT)
265           /* missing:
266           CPUID_EXT2_PDPE1GB */
267 #define TCG_EXT3_FEATURES (CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM | \
268           CPUID_EXT3_CR8LEG | CPUID_EXT3_ABM | CPUID_EXT3_SSE4A)
269 #define TCG_SVM_FEATURES 0
270 
271 /* maintains list of cpu model definitions
272  */
273 static x86_def_t *x86_defs = {NULL};
274 
275 /* built-in cpu model definitions (deprecated)
276  */
277 static x86_def_t builtin_x86_defs[] = {
278     {
279         .name = "qemu64",
280         .level = 4,
281         .vendor1 = CPUID_VENDOR_AMD_1,
282         .vendor2 = CPUID_VENDOR_AMD_2,
283         .vendor3 = CPUID_VENDOR_AMD_3,
284         .family = 6,
285         .model = 2,
286         .stepping = 3,
287         .features = PPRO_FEATURES |
288             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
289             CPUID_PSE36,
290         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_CX16 | CPUID_EXT_POPCNT,
291         .ext2_features = (PPRO_FEATURES & EXT2_FEATURE_MASK) |
292             CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
293         .ext3_features = CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM |
294             CPUID_EXT3_ABM | CPUID_EXT3_SSE4A,
295         .xlevel = 0x8000000A,
296         .model_id = "QEMU Virtual CPU version " QEMU_VERSION,
297     },
298     {
299         .name = "phenom",
300         .level = 5,
301         .vendor1 = CPUID_VENDOR_AMD_1,
302         .vendor2 = CPUID_VENDOR_AMD_2,
303         .vendor3 = CPUID_VENDOR_AMD_3,
304         .family = 16,
305         .model = 2,
306         .stepping = 3,
307         .features = PPRO_FEATURES |
308             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
309             CPUID_PSE36 | CPUID_VME | CPUID_HT,
310         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | CPUID_EXT_CX16 |
311             CPUID_EXT_POPCNT,
312         .ext2_features = (PPRO_FEATURES & EXT2_FEATURE_MASK) |
313             CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX |
314             CPUID_EXT2_3DNOW | CPUID_EXT2_3DNOWEXT | CPUID_EXT2_MMXEXT |
315             CPUID_EXT2_FFXSR | CPUID_EXT2_PDPE1GB | CPUID_EXT2_RDTSCP,
316         /* Missing: CPUID_EXT3_CMP_LEG, CPUID_EXT3_EXTAPIC,
317                     CPUID_EXT3_CR8LEG,
318                     CPUID_EXT3_MISALIGNSSE, CPUID_EXT3_3DNOWPREFETCH,
319                     CPUID_EXT3_OSVW, CPUID_EXT3_IBS */
320         .ext3_features = CPUID_EXT3_LAHF_LM | CPUID_EXT3_SVM |
321             CPUID_EXT3_ABM | CPUID_EXT3_SSE4A,
322         .svm_features = CPUID_SVM_NPT | CPUID_SVM_LBRV,
323         .xlevel = 0x8000001A,
324         .model_id = "AMD Phenom(tm) 9550 Quad-Core Processor"
325     },
326     {
327         .name = "core2duo",
328         .level = 10,
329         .family = 6,
330         .model = 15,
331         .stepping = 11,
332         .features = PPRO_FEATURES |
333             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
334             CPUID_PSE36 | CPUID_VME | CPUID_DTS | CPUID_ACPI | CPUID_SS |
335             CPUID_HT | CPUID_TM | CPUID_PBE,
336         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | CPUID_EXT_SSSE3 |
337             CPUID_EXT_DTES64 | CPUID_EXT_DSCPL | CPUID_EXT_VMX | CPUID_EXT_EST |
338             CPUID_EXT_TM2 | CPUID_EXT_CX16 | CPUID_EXT_XTPR | CPUID_EXT_PDCM,
339         .ext2_features = CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
340         .ext3_features = CPUID_EXT3_LAHF_LM,
341         .xlevel = 0x80000008,
342         .model_id = "Intel(R) Core(TM)2 Duo CPU     T7700  @ 2.40GHz",
343     },
344     {
345         .name = "kvm64",
346         .level = 5,
347         .vendor1 = CPUID_VENDOR_INTEL_1,
348         .vendor2 = CPUID_VENDOR_INTEL_2,
349         .vendor3 = CPUID_VENDOR_INTEL_3,
350         .family = 15,
351         .model = 6,
352         .stepping = 1,
353         /* Missing: CPUID_VME, CPUID_HT */
354         .features = PPRO_FEATURES |
355             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
356             CPUID_PSE36,
357         /* Missing: CPUID_EXT_POPCNT, CPUID_EXT_MONITOR */
358         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_CX16,
359         /* Missing: CPUID_EXT2_PDPE1GB, CPUID_EXT2_RDTSCP */
360         .ext2_features = (PPRO_FEATURES & EXT2_FEATURE_MASK) |
361             CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
362         /* Missing: CPUID_EXT3_LAHF_LM, CPUID_EXT3_CMP_LEG, CPUID_EXT3_EXTAPIC,
363                     CPUID_EXT3_CR8LEG, CPUID_EXT3_ABM, CPUID_EXT3_SSE4A,
364                     CPUID_EXT3_MISALIGNSSE, CPUID_EXT3_3DNOWPREFETCH,
365                     CPUID_EXT3_OSVW, CPUID_EXT3_IBS, CPUID_EXT3_SVM */
366         .ext3_features = 0,
367         .xlevel = 0x80000008,
368         .model_id = "Common KVM processor"
369     },
370     {
371         .name = "qemu32",
372         .level = 4,
373         .family = 6,
374         .model = 3,
375         .stepping = 3,
376         .features = PPRO_FEATURES,
377         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_POPCNT,
378         .xlevel = 0x80000004,
379         .model_id = "QEMU Virtual CPU version " QEMU_VERSION,
380     },
381     {
382         .name = "kvm32",
383         .level = 5,
384         .family = 15,
385         .model = 6,
386         .stepping = 1,
387         .features = PPRO_FEATURES |
388             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA | CPUID_PSE36,
389         .ext_features = CPUID_EXT_SSE3,
390         .ext2_features = PPRO_FEATURES & EXT2_FEATURE_MASK,
391         .ext3_features = 0,
392         .xlevel = 0x80000008,
393         .model_id = "Common 32-bit KVM processor"
394     },
395     {
396         .name = "coreduo",
397         .level = 10,
398         .family = 6,
399         .model = 14,
400         .stepping = 8,
401         .features = PPRO_FEATURES | CPUID_VME |
402             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA | CPUID_DTS | CPUID_ACPI |
403             CPUID_SS | CPUID_HT | CPUID_TM | CPUID_PBE,
404         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | CPUID_EXT_VMX |
405             CPUID_EXT_EST | CPUID_EXT_TM2 | CPUID_EXT_XTPR | CPUID_EXT_PDCM,
406         .ext2_features = CPUID_EXT2_NX,
407         .xlevel = 0x80000008,
408         .model_id = "Genuine Intel(R) CPU           T2600  @ 2.16GHz",
409     },
410     {
411         .name = "486",
412         .level = 1,
413         .family = 4,
414         .model = 0,
415         .stepping = 0,
416         .features = I486_FEATURES,
417         .xlevel = 0,
418     },
419     {
420         .name = "pentium",
421         .level = 1,
422         .family = 5,
423         .model = 4,
424         .stepping = 3,
425         .features = PENTIUM_FEATURES,
426         .xlevel = 0,
427     },
428     {
429         .name = "pentium2",
430         .level = 2,
431         .family = 6,
432         .model = 5,
433         .stepping = 2,
434         .features = PENTIUM2_FEATURES,
435         .xlevel = 0,
436     },
437     {
438         .name = "pentium3",
439         .level = 2,
440         .family = 6,
441         .model = 7,
442         .stepping = 3,
443         .features = PENTIUM3_FEATURES,
444         .xlevel = 0,
445     },
446     {
447         .name = "athlon",
448         .level = 2,
449         .vendor1 = CPUID_VENDOR_AMD_1,
450         .vendor2 = CPUID_VENDOR_AMD_2,
451         .vendor3 = CPUID_VENDOR_AMD_3,
452         .family = 6,
453         .model = 2,
454         .stepping = 3,
455         .features = PPRO_FEATURES | CPUID_PSE36 | CPUID_VME | CPUID_MTRR | CPUID_MCA,
456         .ext2_features = (PPRO_FEATURES & EXT2_FEATURE_MASK) | CPUID_EXT2_MMXEXT | CPUID_EXT2_3DNOW | CPUID_EXT2_3DNOWEXT,
457         .xlevel = 0x80000008,
458         /* XXX: put another string ? */
459         .model_id = "QEMU Virtual CPU version " QEMU_VERSION,
460     },
461     {
462         .name = "n270",
463         /* original is on level 10 */
464         .level = 5,
465         .family = 6,
466         .model = 28,
467         .stepping = 2,
468         .features = PPRO_FEATURES |
469             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA | CPUID_VME | CPUID_DTS |
470             CPUID_ACPI | CPUID_SS | CPUID_HT | CPUID_TM | CPUID_PBE,
471             /* Some CPUs got no CPUID_SEP */
472         .ext_features = CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | CPUID_EXT_SSSE3 |
473             CPUID_EXT_DSCPL | CPUID_EXT_EST | CPUID_EXT_TM2 | CPUID_EXT_XTPR,
474         .ext2_features = (PPRO_FEATURES & EXT2_FEATURE_MASK) | CPUID_EXT2_NX,
475         .ext3_features = CPUID_EXT3_LAHF_LM,
476         .xlevel = 0x8000000A,
477         .model_id = "Intel(R) Atom(TM) CPU N270   @ 1.60GHz",
478     },
479 };
480 
cpu_x86_fill_model_id(char * str)481 static int cpu_x86_fill_model_id(char *str)
482 {
483     uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
484     int i;
485 
486     for (i = 0; i < 3; i++) {
487         host_cpuid(0x80000002 + i, 0, &eax, &ebx, &ecx, &edx);
488         memcpy(str + i * 16 +  0, &eax, 4);
489         memcpy(str + i * 16 +  4, &ebx, 4);
490         memcpy(str + i * 16 +  8, &ecx, 4);
491         memcpy(str + i * 16 + 12, &edx, 4);
492     }
493     return 0;
494 }
495 
cpu_x86_fill_host(x86_def_t * x86_cpu_def)496 static int cpu_x86_fill_host(x86_def_t *x86_cpu_def)
497 {
498     uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
499 
500     x86_cpu_def->name = "host";
501     host_cpuid(0x0, 0, &eax, &ebx, &ecx, &edx);
502     x86_cpu_def->level = eax;
503     x86_cpu_def->vendor1 = ebx;
504     x86_cpu_def->vendor2 = edx;
505     x86_cpu_def->vendor3 = ecx;
506 
507     host_cpuid(0x1, 0, &eax, &ebx, &ecx, &edx);
508     x86_cpu_def->family = ((eax >> 8) & 0x0F) + ((eax >> 20) & 0xFF);
509     x86_cpu_def->model = ((eax >> 4) & 0x0F) | ((eax & 0xF0000) >> 12);
510     x86_cpu_def->stepping = eax & 0x0F;
511     x86_cpu_def->ext_features = ecx;
512     x86_cpu_def->features = edx;
513 
514     host_cpuid(0x80000000, 0, &eax, &ebx, &ecx, &edx);
515     x86_cpu_def->xlevel = eax;
516 
517     host_cpuid(0x80000001, 0, &eax, &ebx, &ecx, &edx);
518     x86_cpu_def->ext2_features = edx;
519     x86_cpu_def->ext3_features = ecx;
520     cpu_x86_fill_model_id(x86_cpu_def->model_id);
521     x86_cpu_def->vendor_override = 0;
522 
523 
524     /*
525      * Every SVM feature requires emulation support in KVM - so we can't just
526      * read the host features here. KVM might even support SVM features not
527      * available on the host hardware. Just set all bits and mask out the
528      * unsupported ones later.
529      */
530     x86_cpu_def->svm_features = -1;
531 
532     return 0;
533 }
534 
unavailable_host_feature(struct model_features_t * f,uint32_t mask)535 static int unavailable_host_feature(struct model_features_t *f, uint32_t mask)
536 {
537     int i;
538 
539     for (i = 0; i < 32; ++i)
540         if (1 << i & mask) {
541             fprintf(stderr, "warning: host cpuid %04x_%04x lacks requested"
542                 " flag '%s' [0x%08x]\n",
543                 f->cpuid >> 16, f->cpuid & 0xffff,
544                 f->flag_names[i] ? f->flag_names[i] : "[reserved]", mask);
545             break;
546         }
547     return 0;
548 }
549 
550 /* best effort attempt to inform user requested cpu flags aren't making
551  * their way to the guest.  Note: ft[].check_feat ideally should be
552  * specified via a guest_def field to suppress report of extraneous flags.
553  */
check_features_against_host(x86_def_t * guest_def)554 static int check_features_against_host(x86_def_t *guest_def)
555 {
556     x86_def_t host_def;
557     uint32_t mask;
558     int rv, i;
559     struct model_features_t ft[] = {
560         {&guest_def->features, &host_def.features,
561             ~0, feature_name, 0x00000000},
562         {&guest_def->ext_features, &host_def.ext_features,
563             ~CPUID_EXT_HYPERVISOR, ext_feature_name, 0x00000001},
564         {&guest_def->ext2_features, &host_def.ext2_features,
565             ~PPRO_FEATURES, ext2_feature_name, 0x80000000},
566         {&guest_def->ext3_features, &host_def.ext3_features,
567             ~CPUID_EXT3_SVM, ext3_feature_name, 0x80000001}};
568 
569     cpu_x86_fill_host(&host_def);
570     for (rv = 0, i = 0; i < ARRAY_SIZE(ft); ++i)
571         for (mask = 1; mask; mask <<= 1)
572             if (ft[i].check_feat & mask && *ft[i].guest_feat & mask &&
573                 !(*ft[i].host_feat & mask)) {
574                     unavailable_host_feature(&ft[i], mask);
575                     rv = 1;
576                 }
577     return rv;
578 }
579 
cpu_x86_find_by_name(x86_def_t * x86_cpu_def,const char * cpu_model)580 static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)
581 {
582     unsigned int i;
583     x86_def_t *def;
584 
585     char *s = strdup(cpu_model);
586     char *featurestr, *name = strtok(s, ",");
587     /* Features to be added*/
588     uint32_t plus_features = 0, plus_ext_features = 0;
589     uint32_t plus_ext2_features = 0, plus_ext3_features = 0;
590     uint32_t plus_kvm_features = 0, plus_svm_features = 0;
591     /* Features to be removed */
592     uint32_t minus_features = 0, minus_ext_features = 0;
593     uint32_t minus_ext2_features = 0, minus_ext3_features = 0;
594     uint32_t minus_kvm_features = 0, minus_svm_features = 0;
595     uint32_t numvalue;
596 
597     for (def = x86_defs; def; def = def->next)
598         if (!strcmp(name, def->name))
599             break;
600     if (kvm_enabled() && strcmp(name, "host") == 0) {
601         cpu_x86_fill_host(x86_cpu_def);
602     } else if (!def) {
603         goto error;
604     } else {
605         memcpy(x86_cpu_def, def, sizeof(*def));
606     }
607 
608     plus_kvm_features = ~0; /* not supported bits will be filtered out later */
609 
610     add_flagname_to_bitmaps("hypervisor", &plus_features,
611         &plus_ext_features, &plus_ext2_features, &plus_ext3_features,
612         &plus_kvm_features, &plus_svm_features);
613 
614     featurestr = strtok(NULL, ",");
615 
616     while (featurestr) {
617         char *val;
618         if (featurestr[0] == '+') {
619             add_flagname_to_bitmaps(featurestr + 1, &plus_features,
620                             &plus_ext_features, &plus_ext2_features,
621                             &plus_ext3_features, &plus_kvm_features,
622                             &plus_svm_features);
623         } else if (featurestr[0] == '-') {
624             add_flagname_to_bitmaps(featurestr + 1, &minus_features,
625                             &minus_ext_features, &minus_ext2_features,
626                             &minus_ext3_features, &minus_kvm_features,
627                             &minus_svm_features);
628         } else if ((val = strchr(featurestr, '='))) {
629             *val = 0; val++;
630             if (!strcmp(featurestr, "family")) {
631                 char *err;
632                 numvalue = strtoul(val, &err, 0);
633                 if (!*val || *err) {
634                     fprintf(stderr, "bad numerical value %s\n", val);
635                     goto error;
636                 }
637                 x86_cpu_def->family = numvalue;
638             } else if (!strcmp(featurestr, "model")) {
639                 char *err;
640                 numvalue = strtoul(val, &err, 0);
641                 if (!*val || *err || numvalue > 0xff) {
642                     fprintf(stderr, "bad numerical value %s\n", val);
643                     goto error;
644                 }
645                 x86_cpu_def->model = numvalue;
646             } else if (!strcmp(featurestr, "stepping")) {
647                 char *err;
648                 numvalue = strtoul(val, &err, 0);
649                 if (!*val || *err || numvalue > 0xf) {
650                     fprintf(stderr, "bad numerical value %s\n", val);
651                     goto error;
652                 }
653                 x86_cpu_def->stepping = numvalue ;
654             } else if (!strcmp(featurestr, "level")) {
655                 char *err;
656                 numvalue = strtoul(val, &err, 0);
657                 if (!*val || *err) {
658                     fprintf(stderr, "bad numerical value %s\n", val);
659                     goto error;
660                 }
661                 x86_cpu_def->level = numvalue;
662             } else if (!strcmp(featurestr, "xlevel")) {
663                 char *err;
664                 numvalue = strtoul(val, &err, 0);
665                 if (!*val || *err) {
666                     fprintf(stderr, "bad numerical value %s\n", val);
667                     goto error;
668                 }
669                 if (numvalue < 0x80000000) {
670                     numvalue += 0x80000000;
671                 }
672                 x86_cpu_def->xlevel = numvalue;
673             } else if (!strcmp(featurestr, "vendor")) {
674                 if (strlen(val) != 12) {
675                     fprintf(stderr, "vendor string must be 12 chars long\n");
676                     goto error;
677                 }
678                 x86_cpu_def->vendor1 = 0;
679                 x86_cpu_def->vendor2 = 0;
680                 x86_cpu_def->vendor3 = 0;
681                 for(i = 0; i < 4; i++) {
682                     x86_cpu_def->vendor1 |= ((uint8_t)val[i    ]) << (8 * i);
683                     x86_cpu_def->vendor2 |= ((uint8_t)val[i + 4]) << (8 * i);
684                     x86_cpu_def->vendor3 |= ((uint8_t)val[i + 8]) << (8 * i);
685                 }
686                 x86_cpu_def->vendor_override = 1;
687             } else if (!strcmp(featurestr, "model_id")) {
688                 pstrcpy(x86_cpu_def->model_id, sizeof(x86_cpu_def->model_id),
689                         val);
690             } else {
691                 fprintf(stderr, "unrecognized feature %s\n", featurestr);
692                 goto error;
693             }
694         } else if (!strcmp(featurestr, "check")) {
695             check_cpuid = 1;
696         } else if (!strcmp(featurestr, "enforce")) {
697             check_cpuid = enforce_cpuid = 1;
698         } else {
699             fprintf(stderr, "feature string `%s' not in format (+feature|-feature|feature=xyz)\n", featurestr);
700             goto error;
701         }
702         featurestr = strtok(NULL, ",");
703     }
704     x86_cpu_def->features |= plus_features;
705     x86_cpu_def->ext_features |= plus_ext_features;
706     x86_cpu_def->ext2_features |= plus_ext2_features;
707     x86_cpu_def->ext3_features |= plus_ext3_features;
708     x86_cpu_def->kvm_features |= plus_kvm_features;
709     x86_cpu_def->svm_features |= plus_svm_features;
710     x86_cpu_def->features &= ~minus_features;
711     x86_cpu_def->ext_features &= ~minus_ext_features;
712     x86_cpu_def->ext2_features &= ~minus_ext2_features;
713     x86_cpu_def->ext3_features &= ~minus_ext3_features;
714     x86_cpu_def->kvm_features &= ~minus_kvm_features;
715     x86_cpu_def->svm_features &= ~minus_svm_features;
716     if (check_cpuid) {
717         if (check_features_against_host(x86_cpu_def) && enforce_cpuid)
718             goto error;
719     }
720     free(s);
721     return 0;
722 
723 error:
724     free(s);
725     return -1;
726 }
727 
728 /* generate a composite string into buf of all cpuid names in featureset
729  * selected by fbits.  indicate truncation at bufsize in the event of overflow.
730  * if flags, suppress names undefined in featureset.
731  */
listflags(char * buf,int bufsize,uint32_t fbits,const char ** featureset,uint32_t flags)732 static void listflags(char *buf, int bufsize, uint32_t fbits,
733     const char **featureset, uint32_t flags)
734 {
735     const char **p = &featureset[31];
736     char *q, *b, bit;
737     int nc;
738 
739     b = 4 <= bufsize ? buf + (bufsize -= 3) - 1 : NULL;
740     *buf = '\0';
741     for (q = buf, bit = 31; fbits && bufsize; --p, fbits &= ~(1 << bit), --bit)
742         if (fbits & 1 << bit && (*p || !flags)) {
743             if (*p)
744                 nc = snprintf(q, bufsize, "%s%s", q == buf ? "" : " ", *p);
745             else
746                 nc = snprintf(q, bufsize, "%s[%d]", q == buf ? "" : " ", bit);
747             if (bufsize <= nc) {
748                 if (b) {
749                     memcpy(b, "...", sizeof("..."));
750                 }
751                 return;
752             }
753             q += nc;
754             bufsize -= nc;
755         }
756 }
757 
758 /* generate CPU information:
759  * -?        list model names
760  * -?model   list model names/IDs
761  * -?dump    output all model (x86_def_t) data
762  * -?cpuid   list all recognized cpuid flag names
763  */
x86_cpu_list(FILE * f,fprintf_function cpu_fprintf,const char * optarg)764 void x86_cpu_list(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
765 {
766     unsigned char model = !strcmp("?model", optarg);
767     unsigned char dump = !strcmp("?dump", optarg);
768     unsigned char cpuid = !strcmp("?cpuid", optarg);
769     x86_def_t *def;
770     char buf[256];
771 
772     if (cpuid) {
773         (*cpu_fprintf)(f, "Recognized CPUID flags:\n");
774         listflags(buf, sizeof (buf), (uint32_t)~0, feature_name, 1);
775         (*cpu_fprintf)(f, "  f_edx: %s\n", buf);
776         listflags(buf, sizeof (buf), (uint32_t)~0, ext_feature_name, 1);
777         (*cpu_fprintf)(f, "  f_ecx: %s\n", buf);
778         listflags(buf, sizeof (buf), (uint32_t)~0, ext2_feature_name, 1);
779         (*cpu_fprintf)(f, "  extf_edx: %s\n", buf);
780         listflags(buf, sizeof (buf), (uint32_t)~0, ext3_feature_name, 1);
781         (*cpu_fprintf)(f, "  extf_ecx: %s\n", buf);
782         return;
783     }
784     for (def = x86_defs; def; def = def->next) {
785         snprintf(buf, sizeof (buf), def->flags ? "[%s]": "%s", def->name);
786         if (model || dump) {
787             (*cpu_fprintf)(f, "x86 %16s  %-48s\n", buf, def->model_id);
788         } else {
789             (*cpu_fprintf)(f, "x86 %16s\n", buf);
790         }
791         if (dump) {
792             memcpy(buf, &def->vendor1, sizeof (def->vendor1));
793             memcpy(buf + 4, &def->vendor2, sizeof (def->vendor2));
794             memcpy(buf + 8, &def->vendor3, sizeof (def->vendor3));
795             buf[12] = '\0';
796             (*cpu_fprintf)(f,
797                 "  family %d model %d stepping %d level %d xlevel 0x%x"
798                 " vendor \"%s\"\n",
799                 def->family, def->model, def->stepping, def->level,
800                 def->xlevel, buf);
801             listflags(buf, sizeof (buf), def->features, feature_name, 0);
802             (*cpu_fprintf)(f, "  feature_edx %08x (%s)\n", def->features,
803                 buf);
804             listflags(buf, sizeof (buf), def->ext_features, ext_feature_name,
805                 0);
806             (*cpu_fprintf)(f, "  feature_ecx %08x (%s)\n", def->ext_features,
807                 buf);
808             listflags(buf, sizeof (buf), def->ext2_features, ext2_feature_name,
809                 0);
810             (*cpu_fprintf)(f, "  extfeature_edx %08x (%s)\n",
811                 def->ext2_features, buf);
812             listflags(buf, sizeof (buf), def->ext3_features, ext3_feature_name,
813                 0);
814             (*cpu_fprintf)(f, "  extfeature_ecx %08x (%s)\n",
815                 def->ext3_features, buf);
816             (*cpu_fprintf)(f, "\n");
817         }
818     }
819     if (kvm_enabled()) {
820         (*cpu_fprintf)(f, "x86 %16s\n", "[host]");
821     }
822 }
823 
cpu_x86_register(CPUX86State * env,const char * cpu_model)824 int cpu_x86_register (CPUX86State *env, const char *cpu_model)
825 {
826     x86_def_t def1, *def = &def1;
827 
828     memset(def, 0, sizeof(*def));
829 
830     if (cpu_x86_find_by_name(def, cpu_model) < 0)
831         return -1;
832     if (def->vendor1) {
833         env->cpuid_vendor1 = def->vendor1;
834         env->cpuid_vendor2 = def->vendor2;
835         env->cpuid_vendor3 = def->vendor3;
836     } else {
837         env->cpuid_vendor1 = CPUID_VENDOR_INTEL_1;
838         env->cpuid_vendor2 = CPUID_VENDOR_INTEL_2;
839         env->cpuid_vendor3 = CPUID_VENDOR_INTEL_3;
840     }
841     env->cpuid_vendor_override = def->vendor_override;
842     env->cpuid_level = def->level;
843     if (def->family > 0x0f)
844         env->cpuid_version = 0xf00 | ((def->family - 0x0f) << 20);
845     else
846         env->cpuid_version = def->family << 8;
847     env->cpuid_version |= ((def->model & 0xf) << 4) | ((def->model >> 4) << 16);
848     env->cpuid_version |= def->stepping;
849     env->cpuid_features = def->features;
850     env->pat = 0x0007040600070406ULL;
851     env->cpuid_ext_features = def->ext_features;
852     env->cpuid_ext2_features = def->ext2_features;
853     env->cpuid_ext3_features = def->ext3_features;
854     env->cpuid_xlevel = def->xlevel;
855     env->cpuid_kvm_features = def->kvm_features;
856     env->cpuid_svm_features = def->svm_features;
857     if (!kvm_enabled()) {
858         env->cpuid_features &= TCG_FEATURES;
859         env->cpuid_ext_features &= TCG_EXT_FEATURES;
860         env->cpuid_ext2_features &= (TCG_EXT2_FEATURES
861 #ifdef TARGET_X86_64
862             | CPUID_EXT2_SYSCALL | CPUID_EXT2_LM
863 #endif
864             );
865         env->cpuid_ext3_features &= TCG_EXT3_FEATURES;
866         env->cpuid_svm_features &= TCG_SVM_FEATURES;
867     }
868     {
869         const char *model_id = def->model_id;
870         int c, len, i;
871         if (!model_id)
872             model_id = "";
873         len = strlen(model_id);
874         for(i = 0; i < 48; i++) {
875             if (i >= len)
876                 c = '\0';
877             else
878                 c = (uint8_t)model_id[i];
879             env->cpuid_model[i >> 2] |= c << (8 * (i & 3));
880         }
881     }
882     return 0;
883 }
884 
885 #if !defined(CONFIG_USER_ONLY)
886 /* copy vendor id string to 32 bit register, nul pad as needed
887  */
cpyid(const char * s,uint32_t * id)888 static void cpyid(const char *s, uint32_t *id)
889 {
890     char *d = (char *)id;
891     char i;
892 
893     for (i = sizeof (*id); i--; )
894         *d++ = *s ? *s++ : '\0';
895 }
896 
897 /* interpret radix and convert from string to arbitrary scalar,
898  * otherwise flag failure
899  */
900 #define setscalar(pval, str, perr)                      \
901 {                                                       \
902     char *pend;                                         \
903     unsigned long ul;                                   \
904                                                         \
905     ul = strtoul(str, &pend, 0);                        \
906     *str && !*pend ? (*pval = ul) : (*perr = 1);        \
907 }
908 
909 /* map cpuid options to feature bits, otherwise return failure
910  * (option tags in *str are delimited by whitespace)
911  */
setfeatures(uint32_t * pval,const char * str,const char ** featureset,int * perr)912 static void setfeatures(uint32_t *pval, const char *str,
913     const char **featureset, int *perr)
914 {
915     const char *p, *q;
916 
917     for (q = p = str; *p || *q; q = p) {
918         while (iswhite(*p))
919             q = ++p;
920         while (*p && !iswhite(*p))
921             ++p;
922         if (!*q && !*p)
923             return;
924         if (!lookup_feature(pval, q, p, featureset)) {
925             fprintf(stderr, "error: feature \"%.*s\" not available in set\n",
926                 (int)(p - q), q);
927             *perr = 1;
928             return;
929         }
930     }
931 }
932 
933 /* map config file options to x86_def_t form
934  */
cpudef_setfield(const char * name,const char * str,void * opaque)935 static int cpudef_setfield(const char *name, const char *str, void *opaque)
936 {
937     x86_def_t *def = opaque;
938     int err = 0;
939 
940     if (!strcmp(name, "name")) {
941         def->name = strdup(str);
942     } else if (!strcmp(name, "model_id")) {
943         strncpy(def->model_id, str, sizeof (def->model_id));
944     } else if (!strcmp(name, "level")) {
945         setscalar(&def->level, str, &err)
946     } else if (!strcmp(name, "vendor")) {
947         cpyid(&str[0], &def->vendor1);
948         cpyid(&str[4], &def->vendor2);
949         cpyid(&str[8], &def->vendor3);
950     } else if (!strcmp(name, "family")) {
951         setscalar(&def->family, str, &err)
952     } else if (!strcmp(name, "model")) {
953         setscalar(&def->model, str, &err)
954     } else if (!strcmp(name, "stepping")) {
955         setscalar(&def->stepping, str, &err)
956     } else if (!strcmp(name, "feature_edx")) {
957         setfeatures(&def->features, str, feature_name, &err);
958     } else if (!strcmp(name, "feature_ecx")) {
959         setfeatures(&def->ext_features, str, ext_feature_name, &err);
960     } else if (!strcmp(name, "extfeature_edx")) {
961         setfeatures(&def->ext2_features, str, ext2_feature_name, &err);
962     } else if (!strcmp(name, "extfeature_ecx")) {
963         setfeatures(&def->ext3_features, str, ext3_feature_name, &err);
964     } else if (!strcmp(name, "xlevel")) {
965         setscalar(&def->xlevel, str, &err)
966     } else {
967         fprintf(stderr, "error: unknown option [%s = %s]\n", name, str);
968         return (1);
969     }
970     if (err) {
971         fprintf(stderr, "error: bad option value [%s = %s]\n", name, str);
972         return (1);
973     }
974     return (0);
975 }
976 
977 /* register config file entry as x86_def_t
978  */
cpudef_register(QemuOpts * opts,void * opaque)979 static int cpudef_register(QemuOpts *opts, void *opaque)
980 {
981     x86_def_t *def = qemu_mallocz(sizeof (x86_def_t));
982 
983     qemu_opt_foreach(opts, cpudef_setfield, def, 1);
984     def->next = x86_defs;
985     x86_defs = def;
986     return (0);
987 }
988 
cpu_clear_apic_feature(CPUX86State * env)989 void cpu_clear_apic_feature(CPUX86State *env)
990 {
991     env->cpuid_features &= ~CPUID_APIC;
992 }
993 
994 #endif /* !CONFIG_USER_ONLY */
995 
996 /* register "cpudef" models defined in configuration file.  Here we first
997  * preload any built-in definitions
998  */
x86_cpudef_setup(void)999 void x86_cpudef_setup(void)
1000 {
1001     int i;
1002 
1003     for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); ++i) {
1004         builtin_x86_defs[i].next = x86_defs;
1005         builtin_x86_defs[i].flags = 1;
1006         x86_defs = &builtin_x86_defs[i];
1007     }
1008 #if !defined(CONFIG_USER_ONLY)
1009     qemu_opts_foreach(qemu_find_opts("cpudef"), cpudef_register, NULL, 0);
1010 #endif
1011 }
1012 
get_cpuid_vendor(CPUX86State * env,uint32_t * ebx,uint32_t * ecx,uint32_t * edx)1013 static void get_cpuid_vendor(CPUX86State *env, uint32_t *ebx,
1014                              uint32_t *ecx, uint32_t *edx)
1015 {
1016     *ebx = env->cpuid_vendor1;
1017     *edx = env->cpuid_vendor2;
1018     *ecx = env->cpuid_vendor3;
1019 
1020     /* sysenter isn't supported on compatibility mode on AMD, syscall
1021      * isn't supported in compatibility mode on Intel.
1022      * Normally we advertise the actual cpu vendor, but you can override
1023      * this if you want to use KVM's sysenter/syscall emulation
1024      * in compatibility mode and when doing cross vendor migration
1025      */
1026     if (kvm_enabled() && ! env->cpuid_vendor_override) {
1027         host_cpuid(0, 0, NULL, ebx, ecx, edx);
1028     }
1029 }
1030 
cpu_x86_cpuid(CPUX86State * env,uint32_t index,uint32_t count,uint32_t * eax,uint32_t * ebx,uint32_t * ecx,uint32_t * edx)1031 void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
1032                    uint32_t *eax, uint32_t *ebx,
1033                    uint32_t *ecx, uint32_t *edx)
1034 {
1035     /* test if maximum index reached */
1036     if (index & 0x80000000) {
1037         if (index > env->cpuid_xlevel)
1038             index = env->cpuid_level;
1039     } else {
1040         if (index > env->cpuid_level)
1041             index = env->cpuid_level;
1042     }
1043 
1044     switch(index) {
1045     case 0:
1046         *eax = env->cpuid_level;
1047         get_cpuid_vendor(env, ebx, ecx, edx);
1048         break;
1049     case 1:
1050         *eax = env->cpuid_version;
1051         *ebx = (env->cpuid_apic_id << 24) | 8 << 8; /* CLFLUSH size in quad words, Linux wants it. */
1052         *ecx = env->cpuid_ext_features;
1053         *edx = env->cpuid_features;
1054         if (env->nr_cores * env->nr_threads > 1) {
1055             *ebx |= (env->nr_cores * env->nr_threads) << 16;
1056             *edx |= 1 << 28;    /* HTT bit */
1057         }
1058         break;
1059     case 2:
1060         /* cache info: needed for Pentium Pro compatibility */
1061         *eax = 1;
1062         *ebx = 0;
1063         *ecx = 0;
1064         *edx = 0x2c307d;
1065         break;
1066     case 4:
1067         /* cache info: needed for Core compatibility */
1068         if (env->nr_cores > 1) {
1069             *eax = (env->nr_cores - 1) << 26;
1070         } else {
1071             *eax = 0;
1072         }
1073         switch (count) {
1074             case 0: /* L1 dcache info */
1075                 *eax |= 0x0000121;
1076                 *ebx = 0x1c0003f;
1077                 *ecx = 0x000003f;
1078                 *edx = 0x0000001;
1079                 break;
1080             case 1: /* L1 icache info */
1081                 *eax |= 0x0000122;
1082                 *ebx = 0x1c0003f;
1083                 *ecx = 0x000003f;
1084                 *edx = 0x0000001;
1085                 break;
1086             case 2: /* L2 cache info */
1087                 *eax |= 0x0000143;
1088                 if (env->nr_threads > 1) {
1089                     *eax |= (env->nr_threads - 1) << 14;
1090                 }
1091                 *ebx = 0x3c0003f;
1092                 *ecx = 0x0000fff;
1093                 *edx = 0x0000001;
1094                 break;
1095             default: /* end of info */
1096                 *eax = 0;
1097                 *ebx = 0;
1098                 *ecx = 0;
1099                 *edx = 0;
1100                 break;
1101         }
1102         break;
1103     case 5:
1104         /* mwait info: needed for Core compatibility */
1105         *eax = 0; /* Smallest monitor-line size in bytes */
1106         *ebx = 0; /* Largest monitor-line size in bytes */
1107         *ecx = CPUID_MWAIT_EMX | CPUID_MWAIT_IBE;
1108         *edx = 0;
1109         break;
1110     case 6:
1111         /* Thermal and Power Leaf */
1112         *eax = 0;
1113         *ebx = 0;
1114         *ecx = 0;
1115         *edx = 0;
1116         break;
1117     case 9:
1118         /* Direct Cache Access Information Leaf */
1119         *eax = 0; /* Bits 0-31 in DCA_CAP MSR */
1120         *ebx = 0;
1121         *ecx = 0;
1122         *edx = 0;
1123         break;
1124     case 0xA:
1125         /* Architectural Performance Monitoring Leaf */
1126         *eax = 0;
1127         *ebx = 0;
1128         *ecx = 0;
1129         *edx = 0;
1130         break;
1131     case 0xD:
1132         /* Processor Extended State */
1133         if (!(env->cpuid_ext_features & CPUID_EXT_XSAVE)) {
1134             *eax = 0;
1135             *ebx = 0;
1136             *ecx = 0;
1137             *edx = 0;
1138             break;
1139         }
1140         if (kvm_enabled()) {
1141             *eax = kvm_arch_get_supported_cpuid(env, 0xd, count, R_EAX);
1142             *ebx = kvm_arch_get_supported_cpuid(env, 0xd, count, R_EBX);
1143             *ecx = kvm_arch_get_supported_cpuid(env, 0xd, count, R_ECX);
1144             *edx = kvm_arch_get_supported_cpuid(env, 0xd, count, R_EDX);
1145         } else {
1146             *eax = 0;
1147             *ebx = 0;
1148             *ecx = 0;
1149             *edx = 0;
1150         }
1151         break;
1152     case 0x80000000:
1153         *eax = env->cpuid_xlevel;
1154         *ebx = env->cpuid_vendor1;
1155         *edx = env->cpuid_vendor2;
1156         *ecx = env->cpuid_vendor3;
1157         break;
1158     case 0x80000001:
1159         *eax = env->cpuid_version;
1160         *ebx = 0;
1161         *ecx = env->cpuid_ext3_features;
1162         *edx = env->cpuid_ext2_features;
1163 
1164         /* The Linux kernel checks for the CMPLegacy bit and
1165          * discards multiple thread information if it is set.
1166          * So dont set it here for Intel to make Linux guests happy.
1167          */
1168         if (env->nr_cores * env->nr_threads > 1) {
1169             uint32_t tebx, tecx, tedx;
1170             get_cpuid_vendor(env, &tebx, &tecx, &tedx);
1171             if (tebx != CPUID_VENDOR_INTEL_1 ||
1172                 tedx != CPUID_VENDOR_INTEL_2 ||
1173                 tecx != CPUID_VENDOR_INTEL_3) {
1174                 *ecx |= 1 << 1;    /* CmpLegacy bit */
1175             }
1176         }
1177         if (kvm_enabled()) {
1178             uint32_t h_eax, h_edx;
1179 
1180             host_cpuid(index, 0, &h_eax, NULL, NULL, &h_edx);
1181 
1182             /* disable CPU features that the host does not support */
1183 
1184             /* long mode */
1185             if ((h_edx & 0x20000000) == 0 /* || !lm_capable_kernel */)
1186                 *edx &= ~0x20000000;
1187             /* syscall */
1188             if ((h_edx & 0x00000800) == 0)
1189                 *edx &= ~0x00000800;
1190             /* nx */
1191             if ((h_edx & 0x00100000) == 0)
1192                 *edx &= ~0x00100000;
1193 
1194             /* disable CPU features that KVM cannot support */
1195 
1196             /* svm */
1197             if (!kvm_nested)
1198                 *ecx &= ~CPUID_EXT3_SVM;
1199             /* 3dnow */
1200             *edx &= ~0xc0000000;
1201         }
1202         break;
1203     case 0x80000002:
1204     case 0x80000003:
1205     case 0x80000004:
1206         *eax = env->cpuid_model[(index - 0x80000002) * 4 + 0];
1207         *ebx = env->cpuid_model[(index - 0x80000002) * 4 + 1];
1208         *ecx = env->cpuid_model[(index - 0x80000002) * 4 + 2];
1209         *edx = env->cpuid_model[(index - 0x80000002) * 4 + 3];
1210         break;
1211     case 0x80000005:
1212         /* cache info (L1 cache) */
1213         *eax = 0x01ff01ff;
1214         *ebx = 0x01ff01ff;
1215         *ecx = 0x40020140;
1216         *edx = 0x40020140;
1217         break;
1218     case 0x80000006:
1219         /* cache info (L2 cache) */
1220         *eax = 0;
1221         *ebx = 0x42004200;
1222         *ecx = 0x02008140;
1223         *edx = 0;
1224         break;
1225     case 0x80000008:
1226         /* virtual & phys address size in low 2 bytes. */
1227 /* XXX: This value must match the one used in the MMU code. */
1228         if (env->cpuid_ext2_features & CPUID_EXT2_LM) {
1229             /* 64 bit processor */
1230 /* XXX: The physical address space is limited to 42 bits in exec.c. */
1231             *eax = 0x00003028;	/* 48 bits virtual, 40 bits physical */
1232         } else {
1233             if (env->cpuid_features & CPUID_PSE36)
1234                 *eax = 0x00000024; /* 36 bits physical */
1235             else
1236                 *eax = 0x00000020; /* 32 bits physical */
1237         }
1238         *ebx = 0;
1239         *ecx = 0;
1240         *edx = 0;
1241         if (env->nr_cores * env->nr_threads > 1) {
1242             *ecx |= (env->nr_cores * env->nr_threads) - 1;
1243         }
1244         break;
1245     case 0x8000000A:
1246 	if (env->cpuid_ext3_features & CPUID_EXT3_SVM) {
1247 		*eax = 0x00000001; /* SVM Revision */
1248 		*ebx = 0x00000010; /* nr of ASIDs */
1249 		*ecx = 0;
1250 		*edx = env->cpuid_svm_features; /* optional features */
1251 	} else {
1252 		*eax = 0;
1253 		*ebx = 0;
1254 		*ecx = 0;
1255 		*edx = 0;
1256 	}
1257         break;
1258     default:
1259         /* reserved values: zero */
1260         *eax = 0;
1261         *ebx = 0;
1262         *ecx = 0;
1263         *edx = 0;
1264         break;
1265     }
1266 }
1267