[PATCH 5/5] KVM: nSVM: set a dummy exit reason in L1 vmcb when loading the nested state

[Maxim Levitsky]

Since the nested migration is a result of a VMRUN, this makes it
possible to keep a warning that L1 vmcb should always have
VMRUN exit reason when switching back to it, which
otherwise triggers incorrectly.

Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
---
 arch/x86/kvm/svm/nested.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 12a12ae940fa..146be4b5084b 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1338,6 +1338,12 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
 	svm->vmcb01.ptr->save.rip = save->rip;
 	svm->vmcb01.ptr->save.cpl = 0;
 
+	/*
+	 * For consistency sake, restore the L1 exit reason
+	 * (that happened prior to the migration) to SVM_EXIT_VMRUN.
+	 */
+	svm->vmcb->control.exit_code = SVM_EXIT_VMRUN;
+
 	nested_load_control_from_vmcb12(svm, ctl);
 
 	svm_switch_vmcb(svm, &svm->nested.vmcb02);
-- 
2.26.2