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KVM: ignore AMDs HWCR register access to set the FFDIS bit

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Linux tries to disable the flush filter on all AMD K8 CPUs. Since KVM
does not handle the needed MSR, the injected #GP will panic the Linux
kernel. Ignore setting of the HWCR.FFDIS bit in this MSR to let Linux
boot with an AMD K8 family guest CPU.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Andre Przywara 2009-06-24 12:44:33 +02:00 committed by Avi Kivity
parent 894a9c5543
commit 8f1589d95e
2 changed files with 8 additions and 1 deletions
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1
arch/x86/kvm/svm.c
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@ -2137,7 +2137,6 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
break;
case MSR_VM_CR:
case MSR_VM_IGNNE:
case MSR_K7_HWCR:
pr_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
break;
default:

8
arch/x86/kvm/x86.c
View File

@ -833,6 +833,14 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
case MSR_EFER:
set_efer(vcpu, data);
break;
case MSR_K7_HWCR:
data &= ~(u64)0x40; /* ignore flush filter disable */
if (data != 0) {
pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
data);
return 1;
}
break;
case MSR_IA32_DEBUGCTLMSR:
if (!data) {
/* We support the non-activated case already */