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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:
Chen Qun 2020-01-20 19:21:44 +01:00
parent e00e657c1e
commit 9ea7723f30
1 changed files with 50 additions and 0 deletions
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target-i386-kvm-initialize-microcode-revision-from-K.patch Normal file
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@ -0,0 +1,50 @@
From 8664cd20e4cdb8594076a26dacef592a4b4816b2 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Mon, 20 Jan 2020 19:21:44 +0100
Subject: [PATCH] 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>
---
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 ec8bc9957e..1962f00c77 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6330,6 +6330,10 @@ 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 60060087fd..7437f86130 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -2628,6 +2628,11 @@ 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.
--
2.27.0