On Wed, 2018-10-24 at 07:06 -0300, Eduardo Habkost wrote: > On Mon, Oct 15, 2018 at 12:47:25PM +0800, Robert Hoo wrote: > > Note RSBA is specially treated -- no matter host support it or not, > > qemu > > pretends it is supported. > > > > Signed-off-by: Robert Hoo <robert...@linux.intel.com> > > I am now wondering what else we need to be able to remove > CPUID_7_0_EDX_ARCH_CAPABILITIES from > feature_word_info[FEAT_7_0_EDX].unmigratable_flags.
Let me know once some thought comes out to you. > > This series is necessary for that, be I think we still can't let > the VM be migrated if arch-capabilities is enabled and we're > running on a host that doesn't have MSR_IA32_ARCH_CAPABILITIES on > kvm_feature_msrs. Agree. So I still keep CPUID_7_0_EDX_ARCH_CAPABILITIES in feature_word_info[FEAT_7_0_EDX].unmigratable_flags for now. > > Reviewed-by: Eduardo Habkost <ehabk...@redhat.com> > > > --- > > target/i386/cpu.c | 31 ++++++++++++++++++++++++++++++- > > target/i386/cpu.h | 8 ++++++++ > > target/i386/kvm.c | 11 +++++++++++ > > 3 files changed, 49 insertions(+), 1 deletion(-) > > > > diff --git a/target/i386/cpu.c b/target/i386/cpu.c > > index d191b9c..51c8fd8 100644 > > --- a/target/i386/cpu.c > > +++ b/target/i386/cpu.c > > @@ -1141,6 +1141,27 @@ static FeatureWordInfo > > feature_word_info[FEATURE_WORDS] = { > > }, > > .tcg_features = ~0U, > > }, > > + /*Below are MSR exposed features*/ > > + [FEAT_ARCH_CAPABILITIES] = { > > + .type = MSR_FEATURE_WORD, > > + .feat_names = { > > + "rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry", > > + "ssb-no", 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, NULL, > > + }, > > + .msr = { > > + .index = MSR_IA32_ARCH_CAPABILITIES, > > + .cpuid_dep = { > > + FEAT_7_0_EDX, > > + CPUID_7_0_EDX_ARCH_CAPABILITIES > > + } > > + }, > > + }, > > }; > > > > typedef struct X86RegisterInfo32 { > > @@ -3696,7 +3717,15 @@ static uint32_t > > x86_cpu_get_supported_feature_word(FeatureWord w, > > wi- > > >cpuid.reg); > > break; > > case MSR_FEATURE_WORD: > > - r = kvm_arch_get_supported_msr_feature(kvm_state, wi- > > >msr.index); > > + /* Special case: > > + * No matter host status, IA32_ARCH_CAPABILITIES.RSBA > > [bit 2] > > + * is always supported in guest. > > + */ > > + if (wi->msr.index == MSR_IA32_ARCH_CAPABILITIES) { > > + r = MSR_ARCH_CAP_RSBA; > > + } > > + r |= kvm_arch_get_supported_msr_feature(kvm_state, > > + wi->msr.index); > > break; > > } > > } else if (hvf_enabled()) { > > diff --git a/target/i386/cpu.h b/target/i386/cpu.h > > index 730c06f..52a52ec 100644 > > --- a/target/i386/cpu.h > > +++ b/target/i386/cpu.h > > @@ -502,6 +502,7 @@ typedef enum FeatureWord { > > FEAT_6_EAX, /* CPUID[6].EAX */ > > FEAT_XSAVE_COMP_LO, /* CPUID[EAX=0xd,ECX=0].EAX */ > > FEAT_XSAVE_COMP_HI, /* CPUID[EAX=0xd,ECX=0].EDX */ > > + FEAT_ARCH_CAPABILITIES, > > FEATURE_WORDS, > > } FeatureWord; > > > > @@ -730,6 +731,13 @@ typedef uint32_t > > FeatureWordArray[FEATURE_WORDS]; > > #define CPUID_TOPOLOGY_LEVEL_SMT (1U << 8) > > #define CPUID_TOPOLOGY_LEVEL_CORE (2U << 8) > > > > +/* MSR Feature Bits */ > > +#define MSR_ARCH_CAP_RDCL_NO (1U << 0) > > +#define MSR_ARCH_CAP_IBRS_ALL (1U << 1) > > +#define MSR_ARCH_CAP_RSBA (1U << 2) > > +#define MSR_ARCH_CAP_SKIP_L1DFL_VMENTRY (1U << 3) > > +#define MSR_ARCH_CAP_SSB_NO (1U << 4) > > + > > #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 db79dad..2f7b40d 100644 > > --- a/target/i386/kvm.c > > +++ b/target/i386/kvm.c > > @@ -1928,6 +1928,17 @@ static int kvm_put_msrs(X86CPU *cpu, int > > level) > > } > > #endif > > > > + /* If host supports feature MSR, write down. */ > > + if (kvm_feature_msrs) { > > + int i; > > + for (i = 0; i < kvm_feature_msrs->nmsrs; i++) > > + if (kvm_feature_msrs->indices[i] == > > MSR_IA32_ARCH_CAPABILITIES) { > > + kvm_msr_entry_add(cpu, MSR_IA32_ARCH_CAPABILITIES, > > + env- > > >features[FEAT_ARCH_CAPABILITIES]); > > + break; > > + } > > + } > > + > > /* > > * The following MSRs have side effects on the guest or are > > too heavy > > * for normal writeback. Limit them to reset or full state > > updates. > > -- > > 1.8.3.1 > > > > > >