045bc2ba9d
backport this and supporting patches to ensure Ryzen/Epyc CPUs work with QEMU and it's new MDS mitigation helpers, which also base on MSRs Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jim Mattson <jmattson@google.com>
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Date: Tue, 30 Oct 2018 12:20:21 -0700
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Subject: [PATCH] kvm: x86: Don't modify MSR_PLATFORM_INFO on vCPU reset
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If userspace has provided a different value for this MSR (e.g with the
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turbo bits set), the userspace-provided value should survive a vCPU
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reset. For backwards compatibility, MSR_PLATFORM_INFO is initialized
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in kvm_arch_vcpu_setup.
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Signed-off-by: Jim Mattson <jmattson@google.com>
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Reviewed-by: Drew Schmitt <dasch@google.com>
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Cc: Abhiroop Dabral <adabral@paloaltonetworks.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit e53d88af63ab4104e1226b8f9959f1e9903da10b)
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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arch/x86/kvm/x86.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
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index c578a90f1128..e1f16d02e44f 100644
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--- a/arch/x86/kvm/x86.c
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+++ b/arch/x86/kvm/x86.c
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@@ -7949,6 +7949,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
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int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
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{
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+ vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
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kvm_vcpu_mtrr_init(vcpu);
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vcpu_load(vcpu);
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kvm_vcpu_reset(vcpu, false);
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@@ -8050,7 +8051,6 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
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kvm_pmu_reset(vcpu);
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vcpu->arch.smbase = 0x30000;
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- vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
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vcpu->arch.msr_misc_features_enables = 0;
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vcpu->arch.xcr0 = XFEATURE_MASK_FP;
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