KVM: x86: Sync DR7 on KVM_SET_DEBUGREGS

Whenever we change arch.dr7, we also have to call kvm_update_dr7. In
case guest debugging is off, this will synchronize the new state into
hardware.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0b3fd809a3c755f2e3d4c8606f1c6be3cbc06c8d..59907c9a9d05c7b3d1a6ed90a05b4992cc5e0db2 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2976,6 +2976,7 @@ static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
        memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
        vcpu->arch.dr6 = dbgregs->dr6;
        vcpu->arch.dr7 = dbgregs->dr7;
+       kvm_update_dr7(vcpu);
 
        return 0;
 }