diff mbox

[04/21] KVM: x86: Clear DR6[0:3] on #DB during handle_dr

Message ID 1414922101-17626-5-git-send-email-namit@cs.technion.ac.il (mailing list archive)
State New, archived
Headers show

Commit Message

Nadav Amit Nov. 2, 2014, 9:54 a.m. UTC 
DR6[0:3] (previous breakpoint indications) are cleared when #DB is injected
during handle_exception, just as real hardware does.  Similarily, handle_dr
should clear DR6[0:3].

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
---
 arch/x86/kvm/vmx.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox

Patch

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index fe4d2f4..8f81bae 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5192,6 +5192,7 @@  static int handle_dr(struct kvm_vcpu *vcpu)
 			vcpu->run->exit_reason = KVM_EXIT_DEBUG;
 			return 0;
 		} else {
+			vcpu->arch.dr6 &= ~15;
 			vcpu->arch.dr6 |= DR6_BD | DR6_RTM;
 			kvm_queue_exception(vcpu, DB_VECTOR);
 			return 1;