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From 8f39b0c9523630efeb451e2298cf64b88cd2ac81 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 17 Feb 2020 16:23:13 +0000
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Subject: [PATCH 3/9] target/i386: kvm: initialize microcode revision from KVM
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20200217162316.2464-4-pbonzini@redhat.com>
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Patchwork-id: 93897
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 3/6] target/i386: kvm: initialize microcode revision from KVM
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Bugzilla: 1791648
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Maxim Levitsky <mlevitsk@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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KVM can return the host microcode revision as a feature MSR.
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Use it as the default value for -cpu host.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Message-Id: <1579544504-3616-4-git-send-email-pbonzini@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 32c87d70ff55b96741f08c35108935cac6f40fe4)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/cpu.c | 4 ++++
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target/i386/kvm.c | 5 +++++
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2 files changed, 9 insertions(+)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index e505d3e..5ac843d 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -6323,6 +6323,10 @@ 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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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index f41605b..6c61aef 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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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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/*
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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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--
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1.8.3.1
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