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@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 1 +
1 file changed, 1 insertion(+)
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;
--
1.9.1
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