diff options
| author | Yang Weijiang | 2022-02-15 20:52:58 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2022-05-14 12:32:41 +0200 |
| commit | c3c67679f65903b7d1fe25da8fc4e163878ab2b9 (patch) | |
| tree | 18b04e655a77ca60f39ec21ac1bcfa06e8653895 | |
| parent | target/i386: introduce helper to access supported CPUID (diff) | |
| download | qemu-c3c67679f65903b7d1fe25da8fc4e163878ab2b9.tar.gz qemu-c3c67679f65903b7d1fe25da8fc4e163878ab2b9.tar.xz qemu-c3c67679f65903b7d1fe25da8fc4e163878ab2b9.zip | |
target/i386: Support Arch LBR in CPUID enumeration
If CPUID.(EAX=07H, ECX=0):EDX[19] is set to 1, the processor
supports Architectural LBRs. In this case, CPUID leaf 01CH
indicates details of the Architectural LBRs capabilities.
XSAVE support for Architectural LBRs is enumerated in
CPUID.(EAX=0DH, ECX=0FH).
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Message-Id: <20220215195258.29149-9-weijiang.yang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | target/i386/cpu.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index dcc770ecea..35c3475e6c 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -855,7 +855,7 @@ FeatureWordInfo feature_word_info[FEATURE_WORDS] = { "fsrm", NULL, NULL, NULL, "avx512-vp2intersect", NULL, "md-clear", NULL, NULL, NULL, "serialize", NULL, - "tsx-ldtrk", NULL, NULL /* pconfig */, NULL, + "tsx-ldtrk", NULL, NULL /* pconfig */, "arch-lbr", NULL, NULL, "amx-bf16", "avx512-fp16", "amx-tile", "amx-int8", "spec-ctrl", "stibp", NULL, "arch-capabilities", "core-capability", "ssbd", @@ -5420,6 +5420,13 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, assert(!(*eax & ~0x1f)); *ebx &= 0xffff; /* The count doesn't need to be reliable. */ break; + case 0x1C: + if (accel_uses_host_cpuid() && cpu->enable_pmu && + (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_ARCH_LBR)) { + x86_cpu_get_supported_cpuid(0x1C, 0, eax, ebx, ecx, edx); + *edx = 0; + } + break; case 0x1F: /* V2 Extended Topology Enumeration Leaf */ if (env->nr_dies < 2) { @@ -5482,6 +5489,17 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, *ebx = xsave_area_size(xstate, true); *ecx = env->features[FEAT_XSAVE_XSS_LO]; *edx = env->features[FEAT_XSAVE_XSS_HI]; + if (kvm_enabled() && cpu->enable_pmu && + (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_ARCH_LBR) && + (*eax & CPUID_XSAVE_XSAVES)) { + *ecx |= XSTATE_ARCH_LBR_MASK; + } else { + *ecx &= ~XSTATE_ARCH_LBR_MASK; + } + } else if (count == 0xf && + accel_uses_host_cpuid() && cpu->enable_pmu && + (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_ARCH_LBR)) { + x86_cpu_get_supported_cpuid(0xD, count, eax, ebx, ecx, edx); } else if (count < ARRAY_SIZE(x86_ext_save_areas)) { const ExtSaveArea *esa = &x86_ext_save_areas[count]; |