target/i386: kvm: initialize microcode revision from KVM
KVM can return the host microcode revision as a feature MSR. Use it as the default value for -cpu host. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1579544504-3616-4-git-send-email-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -6416,6 +6416,10 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
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&cpu->mwait.ecx, &cpu->mwait.edx);
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env->features[FEAT_1_ECX] |= CPUID_EXT_MONITOR;
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}
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if (kvm_enabled() && cpu->ucode_rev == 0) {
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cpu->ucode_rev = kvm_arch_get_supported_msr_feature(kvm_state,
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MSR_IA32_UCODE_REV);
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}
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}
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if (cpu->ucode_rev == 0) {
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@ -2696,6 +2696,11 @@ static void kvm_init_msrs(X86CPU *cpu)
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env->features[FEAT_CORE_CAPABILITY]);
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}
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if (kvm_arch_get_supported_msr_feature(kvm_state,
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MSR_IA32_UCODE_REV)) {
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kvm_msr_entry_add(cpu, MSR_IA32_UCODE_REV, cpu->ucode_rev);
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}
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/*
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* Older kernels do not include VMX MSRs in KVM_GET_MSR_INDEX_LIST, but
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* all kernels with MSR features should have them.
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