From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Sat, 4 Jan 2014 17:47:15 +0000 (+0100)
Subject: KVM: x86: Sync DR7 on KVM_SET_DEBUGREGS
X-Git-Tag: firefly_0821_release~176^2~4603^2~10
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9926c9fdbdd54bb229fe6fdbd15ca3af2b8425ae;p=firefly-linux-kernel-4.4.55.git

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 0b3fd809a3c7..59907c9a9d05 100644
--- 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;
 }