KVM: SVM: align shadow CR4.MCE with host

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>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d7439ceb2ac2c9a77367aeadc7fe2c1f751dc854..8af463b91526cb48f190b25b1bf6ba6a4a9e62c1 100644 (file)
--- 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;
 }