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i386: Add FEAT_8000_0008_EBX CPUID feature word

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Add the new feature word and the "ibpb" feature flag.

Based on a patch by Paolo Bonzini.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180109154519.25634-5-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2018-01-09 13:45:16 -02:00
parent a2381f0934
commit 1b3420e1c4
2 changed files with 21 additions and 1 deletions
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19
target/i386/cpu.c
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@ -483,6 +483,22 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
.tcg_features = TCG_APM_FEATURES,
.unmigratable_flags = CPUID_APM_INVTSC,
},
[FEAT_8000_0008_EBX] = {
.feat_names = {
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
"ibpb", NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
},
.cpuid_eax = 0x80000008,
.cpuid_reg = R_EBX,
.tcg_features = 0,
.unmigratable_flags = 0,
},
[FEAT_XSAVE] = {
.feat_names = {
"xsaveopt", "xsavec", "xgetbv1", "xsaves",
@ -3130,7 +3146,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
} else {
*eax = cpu->phys_bits;
}
*ebx = 0;
*ebx = env->features[FEAT_8000_0008_EBX];
*ecx = 0;
*edx = 0;
if (cs->nr_cores * cs->nr_threads > 1) {
@ -3593,6 +3609,7 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
x86_cpu_adjust_feat_level(cpu, FEAT_8000_0001_EDX);
x86_cpu_adjust_feat_level(cpu, FEAT_8000_0001_ECX);
x86_cpu_adjust_feat_level(cpu, FEAT_8000_0007_EDX);
x86_cpu_adjust_feat_level(cpu, FEAT_8000_0008_EBX);
x86_cpu_adjust_feat_level(cpu, FEAT_C000_0001_EDX);
x86_cpu_adjust_feat_level(cpu, FEAT_SVM);
x86_cpu_adjust_feat_level(cpu, FEAT_XSAVE);

3
target/i386/cpu.h
View File

@ -472,6 +472,7 @@ typedef enum FeatureWord {
FEAT_8000_0001_EDX, /* CPUID[8000_0001].EDX */
FEAT_8000_0001_ECX, /* CPUID[8000_0001].ECX */
FEAT_8000_0007_EDX, /* CPUID[8000_0007].EDX */
FEAT_8000_0008_EBX, /* CPUID[8000_0008].EBX */
FEAT_C000_0001_EDX, /* CPUID[C000_0001].EDX */
FEAT_KVM, /* CPUID[4000_0001].EAX (KVM_CPUID_FEATURES) */
FEAT_HYPERV_EAX, /* CPUID[4000_0003].EAX */
@ -669,6 +670,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
#define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply Accumulation Single Precision */
#define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control */
#define CPUID_8000_0008_EBX_IBPB (1U << 12) /* Indirect Branch Prediction Barrier */
#define CPUID_XSAVE_XSAVEOPT (1U << 0)
#define CPUID_XSAVE_XSAVEC (1U << 1)
#define CPUID_XSAVE_XGETBV1 (1U << 2)