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KVM: SVM: Sync efer back into nested vmcb 

This patch fixes a bug in a nested hypervisor that heavily
switches between real-mode and long-mode. The problem is
fixed by syncing back efer into the guest vmcb on emulated
vmexit.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Joerg Roedel 2010-07-27 18:14:20 +02:00 committed by Avi Kivity
parent 19ada5c4b6
commit 3f6a9d1693
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/svm.c
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@ -1896,6 +1896,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
nested_vmcb->save.ds = vmcb->save.ds;
nested_vmcb->save.gdtr = vmcb->save.gdtr;
nested_vmcb->save.idtr = vmcb->save.idtr;
nested_vmcb->save.efer = svm->vcpu.arch.efer;
nested_vmcb->save.cr0 = kvm_read_cr0(&svm->vcpu);
nested_vmcb->save.cr3 = svm->vcpu.arch.cr3;
nested_vmcb->save.cr2 = vmcb->save.cr2;