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[PATCH 3/3] target/i386: kvm: initialize microcode revision from KVM
From: |
Paolo Bonzini |
Subject: |
[PATCH 3/3] target/i386: kvm: initialize microcode revision from KVM |
Date: |
Mon, 20 Jan 2020 19:21:44 +0100 |
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 <address@hidden>
---
target/i386/cpu.c | 4 ++++
target/i386/kvm.c | 5 +++++
2 files changed, 9 insertions(+)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 05ce64c..1f731c1 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -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) {
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index f6dd6b7..26c1e78 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -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.
--
1.8.3.1