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

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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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-11-02 11:54:44 +02:00 committed by Paolo Bonzini
parent 6d2a0526b0
commit 7305eb5d8c
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/vmx.c
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@ -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;