KVM: ppc: Add dbsr in kvm_vcpu_arch

Kernel for E500 need clear dbsr when startup.
So add dbsr register in kvm_vcpu_arch for BOOKE.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/powerpc/include/asm/kvm_host.h

@@ -163,6 +163,7 @@ struct kvm_vcpu_arch {
 	u32 ccr1;
 	u32 dbcr0;
 	u32 dbcr1;
+	u32 dbsr;
 
 #ifdef CONFIG_KVM_EXIT_TIMING
 	struct kvmppc_exit_timing timing_exit;

arch/powerpc/kvm/booke_emulate.c

@@ -111,6 +111,8 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
 		vcpu->arch.dbcr0 = vcpu->arch.gpr[rs]; break;
 	case SPRN_DBCR1:
 		vcpu->arch.dbcr1 = vcpu->arch.gpr[rs]; break;
+	case SPRN_DBSR:
+		vcpu->arch.dbsr &= ~vcpu->arch.gpr[rs]; break;
 	case SPRN_TSR:
 		vcpu->arch.tsr &= ~vcpu->arch.gpr[rs]; break;
 	case SPRN_TCR:
@@ -204,6 +206,8 @@ int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
 		vcpu->arch.gpr[rt] = vcpu->arch.dbcr0; break;
 	case SPRN_DBCR1:
 		vcpu->arch.gpr[rt] = vcpu->arch.dbcr1; break;
+	case SPRN_DBSR:
+		vcpu->arch.gpr[rt] = vcpu->arch.dbsr; break;
 
 	case SPRN_IVOR0:
 		vcpu->arch.gpr[rt] = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];