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.roe...@amd.com>
---
arch/x86/kvm/svm.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 56c9b6b..7d10f2c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1897,6 +1897,7 @@ 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;
--
1.7.0.4
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