diff options
| -rw-r--r-- | arch/x86/kvm/vmx/tdx.c | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 6ce20082a519..1aecb4050082 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -2065,6 +2065,7 @@ bool tdx_has_emulated_msr(u32 index) case MSR_MISC_FEATURES_ENABLES: case MSR_IA32_APICBASE: case MSR_EFER: + case MSR_IA32_FEAT_CTL: case MSR_IA32_MCG_CAP: case MSR_IA32_MCG_STATUS: case MSR_IA32_MCG_CTL: @@ -2097,26 +2098,53 @@ bool tdx_has_emulated_msr(u32 index) static bool tdx_is_read_only_msr(u32 index) { - return index == MSR_IA32_APICBASE || index == MSR_EFER; + return index == MSR_IA32_APICBASE || index == MSR_EFER || + index == MSR_IA32_FEAT_CTL; } int tdx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) { - if (!tdx_has_emulated_msr(msr->index)) - return 1; + switch (msr->index) { + case MSR_IA32_FEAT_CTL: + /* + * MCE and MCA are advertised via cpuid. Guest kernel could + * check if LMCE is enabled or not. + */ + msr->data = FEAT_CTL_LOCKED; + if (vcpu->arch.mcg_cap & MCG_LMCE_P) + msr->data |= FEAT_CTL_LMCE_ENABLED; + return 0; + case MSR_IA32_MCG_EXT_CTL: + if (!msr->host_initiated && !(vcpu->arch.mcg_cap & MCG_LMCE_P)) + return 1; + msr->data = vcpu->arch.mcg_ext_ctl; + return 0; + default: + if (!tdx_has_emulated_msr(msr->index)) + return 1; - return kvm_get_msr_common(vcpu, msr); + return kvm_get_msr_common(vcpu, msr); + } } int tdx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) { - if (tdx_is_read_only_msr(msr->index)) - return 1; + switch (msr->index) { + case MSR_IA32_MCG_EXT_CTL: + if ((!msr->host_initiated && !(vcpu->arch.mcg_cap & MCG_LMCE_P)) || + (msr->data & ~MCG_EXT_CTL_LMCE_EN)) + return 1; + vcpu->arch.mcg_ext_ctl = msr->data; + return 0; + default: + if (tdx_is_read_only_msr(msr->index)) + return 1; - if (!tdx_has_emulated_msr(msr->index)) - return 1; + if (!tdx_has_emulated_msr(msr->index)) + return 1; - return kvm_set_msr_common(vcpu, msr); + return kvm_set_msr_common(vcpu, msr); + } } static int tdx_get_capabilities(struct kvm_tdx_cmd *cmd) |