On 17/06/19 17:36, Xiaoyao Li wrote: > MSR IA32_CORE_CAPABILITY is a feature-enumerating MSR, which only > enumerates the feature split lock detection (via bit 5) by now. > > The existence of MSR IA32_CORE_CAPABILITY is enumerated by CPUID.7_0:EDX[30]. > > The latest kernel patches about them can be found here: > https://lkml.org/lkml/2019/4/24/1909 > > Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxxxxxxxx> > --- > Changelog: > v2 > Add definition of MSR_CORE_CAP_SPLIT_LOCK_DETECT for SNR cpu model > --- > target/i386/cpu.c | 22 +++++++++++++++++++++- > target/i386/cpu.h | 5 +++++ > target/i386/kvm.c | 9 +++++++++ > 3 files changed, 35 insertions(+), 1 deletion(-) > > diff --git a/target/i386/cpu.c b/target/i386/cpu.c > index fbed2eb804..fc47c650b8 100644 > --- a/target/i386/cpu.c > +++ b/target/i386/cpu.c > @@ -1085,7 +1085,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { > NULL, NULL, NULL, NULL, > NULL, NULL, NULL, NULL, > NULL, NULL, "spec-ctrl", "stibp", > - NULL, "arch-capabilities", NULL, "ssbd", > + NULL, "arch-capabilities", "core-capability", "ssbd", > }, > .cpuid = { > .eax = 7, > @@ -1203,6 +1203,26 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { > } > }, > }, > + [FEAT_CORE_CAPABILITY] = { > + .type = MSR_FEATURE_WORD, > + .feat_names = { > + NULL, NULL, NULL, NULL, > + NULL, "split-lock-detect", NULL, NULL, > + NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, > + }, > + .msr = { > + .index = MSR_IA32_CORE_CAPABILITY, > + .cpuid_dep = { > + FEAT_7_0_EDX, > + CPUID_7_0_EDX_CORE_CAPABILITY, > + }, > + }, > + }, > }; > > typedef struct X86RegisterInfo32 { > diff --git a/target/i386/cpu.h b/target/i386/cpu.h > index 0732e059ec..192b0db076 100644 > --- a/target/i386/cpu.h > +++ b/target/i386/cpu.h > @@ -345,6 +345,7 @@ typedef enum X86Seg { > #define MSR_IA32_SPEC_CTRL 0x48 > #define MSR_VIRT_SSBD 0xc001011f > #define MSR_IA32_PRED_CMD 0x49 > +#define MSR_IA32_CORE_CAPABILITY 0xcf > #define MSR_IA32_ARCH_CAPABILITIES 0x10a > #define MSR_IA32_TSCDEADLINE 0x6e0 > > @@ -496,6 +497,7 @@ typedef enum FeatureWord { > FEAT_XSAVE_COMP_LO, /* CPUID[EAX=0xd,ECX=0].EAX */ > FEAT_XSAVE_COMP_HI, /* CPUID[EAX=0xd,ECX=0].EDX */ > FEAT_ARCH_CAPABILITIES, > + FEAT_CORE_CAPABILITY, > FEATURE_WORDS, > } FeatureWord; > > @@ -687,6 +689,7 @@ 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_7_0_EDX_ARCH_CAPABILITIES (1U << 29) /*Arch Capabilities*/ > +#define CPUID_7_0_EDX_CORE_CAPABILITY (1U << 30) /*Core Capability*/ > #define CPUID_7_0_EDX_SPEC_CTRL_SSBD (1U << 31) /* Speculative Store Bypass Disable */ > > #define CPUID_8000_0008_EBX_WBNOINVD (1U << 9) /* Write back and > @@ -734,6 +737,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS]; > #define MSR_ARCH_CAP_SKIP_L1DFL_VMENTRY (1U << 3) > #define MSR_ARCH_CAP_SSB_NO (1U << 4) > > +#define MSR_CORE_CAP_SPLIT_LOCK_DETECT (1U << 5) > + > #ifndef HYPERV_SPINLOCK_NEVER_RETRY > #define HYPERV_SPINLOCK_NEVER_RETRY 0xFFFFFFFF > #endif > diff --git a/target/i386/kvm.c b/target/i386/kvm.c > index 6899061b4e..da99e91ea9 100644 > --- a/target/i386/kvm.c > +++ b/target/i386/kvm.c > @@ -95,6 +95,7 @@ static bool has_msr_spec_ctrl; > static bool has_msr_virt_ssbd; > static bool has_msr_smi_count; > static bool has_msr_arch_capabs; > +static bool has_msr_core_capabs; > > static uint32_t has_architectural_pmu_version; > static uint32_t num_architectural_pmu_gp_counters; > @@ -1515,6 +1516,9 @@ static int kvm_get_supported_msrs(KVMState *s) > case MSR_IA32_ARCH_CAPABILITIES: > has_msr_arch_capabs = true; > break; > + case MSR_IA32_CORE_CAPABILITY: > + has_msr_core_capabs = true; > + break; > } > } > } > @@ -2041,6 +2045,11 @@ static int kvm_put_msrs(X86CPU *cpu, int level) > env->features[FEAT_ARCH_CAPABILITIES]); > } > > + if (has_msr_core_capabs) { > + kvm_msr_entry_add(cpu, MSR_IA32_CORE_CAPABILITY, > + env->features[FEAT_CORE_CAPABILITY]); > + } > + > /* > * The following MSRs have side effects on the guest or are too heavy > * for normal writeback. Limit them to reset or full state updates. > Queued, thanks. Paolo
