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    Subject[PATCH 04/31] KVM: SVM: align shadow CR4.MCE with host
    Date
    From: Joerg Roedel <joerg.roedel@amd.com>

    This patch aligns the host version of the CR4.MCE bit with the CR4 active in
    the guest. This is necessary to get MCE exceptions when the guest is running.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
    arch/x86/kvm/svm.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index d7439ce..8af463b 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -878,9 +878,12 @@ set:

    static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
    {
    + unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
    +
    vcpu->arch.cr4 = cr4;
    if (!npt_enabled)
    cr4 |= X86_CR4_PAE;
    + cr4 |= host_cr4_mce;
    to_svm(vcpu)->vmcb->save.cr4 = cr4;
    }

    --
    1.5.5


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