From 8f1589d95e5eab1ed287f217a33656e922cdbdd0 Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Wed, 24 Jun 2009 12:44:33 +0200 Subject: [PATCH] KVM: ignore AMDs HWCR register access to set the FFDIS bit 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 Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 1 - arch/x86/kvm/x86.c | 8 ++++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index b1c446208867..8728e514c851 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -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: diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e9b0982d2589..cae5b12bf938 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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 */ -- 2.34.1