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    Subject[PATCH 35/47] KVM: ignore AMDs HWCR register access to set the FFDIS bit
    Date
    From: Andre Przywara <andre.przywara@amd.com>

    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>
    ---
    arch/x86/kvm/svm.c | 1 -
    arch/x86/kvm/x86.c | 8 ++++++++
    2 files changed, 8 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index 081d00a..d664157 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -2138,7 +2138,6 @@ 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 e9b0982..cae5b12 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 */
    --
    1.6.3.3


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