From 7305eb5d8cf147ce4178e723c95de15e2f001429 Mon Sep 17 00:00:00 2001 From: Nadav Amit Date: Sun, 2 Nov 2014 11:54:44 +0200 Subject: [PATCH] KVM: x86: Clear DR6[0:3] on #DB during handle_dr 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 Signed-off-by: Paolo Bonzini --- 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 f9d56c1945de..ad5e0806e1e1 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -5125,6 +5125,7 @@ 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; -- 2.20.1