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charset="utf-8" Add the "lbrext-v2" CPU feature (CPUID 0x80000022.EAX[1]) and report the 16-entry LBR stack size in EBX[9:4], allowing guests to use AMD's Last Branch Record Extension v2 when KVM virtualizes it. Signed-off-by: Shivansh Dhiman --- target/i386/cpu.c | 18 +++++++++++++++--- target/i386/cpu.h | 1 + 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 9d126600c057..678863de68d5 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1464,7 +1464,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] =3D { [FEAT_8000_0022_EAX] =3D { .type =3D CPUID_FEATURE_WORD, .feat_names =3D { - "perfmon-v2", NULL, NULL, NULL, + "perfmon-v2", "lbrext-v2", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, @@ -2044,6 +2044,10 @@ static FeatureDep feature_dependencies[] =3D { .from =3D { FEAT_7_1_EAX, CPUID_7_1_EAX_FRED }, .to =3D { FEAT_VMX_ENTRY_CTLS, VMX_VM_ENTRY_LOAD_IA32_FRED = }, }, + { + .from =3D { FEAT_8000_0022_EAX, CPUID_8000_0022_EAX_PERFMON_= V2 }, + .to =3D { FEAT_8000_0022_EAX, CPUID_8000_0022_EAX_LBREXT_V= 2 }, + }, }; =20 typedef struct X86RegisterInfo32 { @@ -9138,12 +9142,20 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index= , uint32_t count, case 0x80000022: *eax =3D *ebx =3D *ecx =3D *edx =3D 0; /* AMD Extended Performance Monitoring and Debug */ - if (kvm_enabled() && cpu->enable_pmu && - (env->features[FEAT_8000_0022_EAX] & CPUID_8000_0022_EAX_PERFM= ON_V2)) { + if (!kvm_enabled() || !cpu->enable_pmu) { + break; + } + if (env->features[FEAT_8000_0022_EAX] & CPUID_8000_0022_EAX_PERFMO= N_V2) { *eax |=3D CPUID_8000_0022_EAX_PERFMON_V2; *ebx |=3D kvm_arch_get_supported_cpuid(cs->kvm_state, index, c= ount, R_EBX) & 0xf; } + /* Dependency PERFMON_V2 =3D> LBREXT_V2 enforced via feature_depen= dencies[] */ + if (env->features[FEAT_8000_0022_EAX] & CPUID_8000_0022_EAX_LBREXT= _V2) { + *eax |=3D CPUID_8000_0022_EAX_LBREXT_V2; + *ebx |=3D kvm_arch_get_supported_cpuid(cs->kvm_state, index, c= ount, + R_EBX) & 0x3f0; /* EBX[9:= 4] */ + } break; case 0xC0000000: *eax =3D env->cpuid_xlevel2; diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 0b539155c409..64e40a654260 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1221,6 +1221,7 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *c= pu, FeatureWord w); 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charset="utf-8" Add the "lbr-pmc-freeze" CPU feature (CPUID 0x80000022.EAX[2]), which lets a guest freeze the LBR stack and performance counters on a PMI. As it operates on the LBR v2 stack, make it depend on lbrext-v2. Signed-off-by: Shivansh Dhiman --- target/i386/cpu.c | 10 +++++++++- target/i386/cpu.h | 5 +++-- 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 678863de68d5..b22a2a9314ac 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1464,7 +1464,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] =3D { [FEAT_8000_0022_EAX] =3D { .type =3D CPUID_FEATURE_WORD, .feat_names =3D { - "perfmon-v2", "lbrext-v2", NULL, NULL, + "perfmon-v2", "lbrext-v2", "lbr-pmc-freeze", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, @@ -2048,6 +2048,10 @@ static FeatureDep feature_dependencies[] =3D { .from =3D { FEAT_8000_0022_EAX, CPUID_8000_0022_EAX_PERFMON_= V2 }, .to =3D { FEAT_8000_0022_EAX, CPUID_8000_0022_EAX_LBREXT_V= 2 }, }, + { + .from =3D { FEAT_8000_0022_EAX, CPUID_8000_0022_EAX_LBREXT_V= 2 }, + .to =3D { FEAT_8000_0022_EAX, CPUID_8000_0022_EAX_LBR_PMC_= FREEZE }, + }, }; =20 typedef struct X86RegisterInfo32 { @@ -9156,6 +9160,10 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,= uint32_t count, *ebx |=3D kvm_arch_get_supported_cpuid(cs->kvm_state, index, c= ount, R_EBX) & 0x3f0; /* EBX[9:= 4] */ } + /* Dependency LBREXT_V2 =3D> LBRPMC_FREEZE enforced via feature_de= pendencies[] */ + if (env->features[FEAT_8000_0022_EAX] & CPUID_8000_0022_EAX_LBR_PM= C_FREEZE) { + *eax |=3D CPUID_8000_0022_EAX_LBR_PMC_FREEZE; + } break; case 0xC0000000: *eax =3D env->cpuid_xlevel2; diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 64e40a654260..c8f51531ba85 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -1220,8 +1220,9 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *c= pu, FeatureWord w); #define CPUID_8000_0021_ECX_TSA_L1_NO (1U << 2) =20 /* Performance Monitoring Version 2 */ -#define CPUID_8000_0022_EAX_PERFMON_V2 (1U << 0) -#define CPUID_8000_0022_EAX_LBREXT_V2 (1U << 1) +#define CPUID_8000_0022_EAX_PERFMON_V2 (1U << 0) +#define CPUID_8000_0022_EAX_LBREXT_V2 (1U << 1) +#define CPUID_8000_0022_EAX_LBR_PMC_FREEZE (1U << 2) =20 #define CPUID_XSAVE_XSAVEOPT (1U << 0) #define CPUID_XSAVE_XSAVEC (1U << 1) --=20 2.43.0