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target/i386: kvm: initialize microcode revision from KVM

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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>
This commit is contained in:
Paolo Bonzini 2020-01-20 19:21:44 +01:00
parent 4e45aff398
commit 32c87d70ff
2 changed files with 9 additions and 0 deletions
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4
target/i386/cpu.c
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@ -6416,6 +6416,10 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
&cpu->mwait.ecx, &cpu->mwait.edx);
env->features[FEAT_1_ECX] |= CPUID_EXT_MONITOR;
}
if (kvm_enabled() && cpu->ucode_rev == 0) {
cpu->ucode_rev = kvm_arch_get_supported_msr_feature(kvm_state,
MSR_IA32_UCODE_REV);
}
}
if (cpu->ucode_rev == 0) {

5
target/i386/kvm.c
View File

@ -2696,6 +2696,11 @@ static void kvm_init_msrs(X86CPU *cpu)
env->features[FEAT_CORE_CAPABILITY]);
}
if (kvm_arch_get_supported_msr_feature(kvm_state,
MSR_IA32_UCODE_REV)) {
kvm_msr_entry_add(cpu, MSR_IA32_UCODE_REV, cpu->ucode_rev);
}
/*
* Older kernels do not include VMX MSRs in KVM_GET_MSR_INDEX_LIST, but
* all kernels with MSR features should have them.