Commit 3f6a9d16 authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 19ada5c4

arch/x86/kvm/svm.c

+1 −0
Original line number Diff line number Diff line
@@ -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;