KVM: PPC: BOOK3S: PR: Emulate instruction counter

Writing to IC is not allowed in the privileged mode.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/include/asm/kvm_host.h

@@ -506,6 +506,7 @@ struct kvm_vcpu_arch {
 	/* Time base value when we entered the guest */
 	u64 entry_tb;
 	u64 entry_vtb;
+	u64 entry_ic;
 	u32 tcr;
 	ulong tsr; /* we need to perform set/clr_bits() which requires ulong */
 	u32 ivor[64];

arch/powerpc/kvm/book3s.c

@@ -649,6 +649,9 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 		case KVM_REG_PPC_VTB:
 			val = get_reg_val(reg->id, vcpu->arch.vtb);
 			break;
+		case KVM_REG_PPC_IC:
+			val = get_reg_val(reg->id, vcpu->arch.ic);
+			break;
 		default:
 			r = -EINVAL;
 			break;
@@ -756,6 +759,9 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 		case KVM_REG_PPC_VTB:
 			vcpu->arch.vtb = set_reg_val(reg->id, val);
 			break;
+		case KVM_REG_PPC_IC:
+			vcpu->arch.ic = set_reg_val(reg->id, val);
+			break;
 		default:
 			r = -EINVAL;
 			break;

arch/powerpc/kvm/book3s_emulate.c

@@ -580,6 +580,9 @@ int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val
 	case SPRN_VTB:
 		*spr_val = vcpu->arch.vtb;
 		break;
+	case SPRN_IC:
+		*spr_val = vcpu->arch.ic;
+		break;
 	case SPRN_GQR0:
 	case SPRN_GQR1:
 	case SPRN_GQR2:

arch/powerpc/kvm/book3s_hv.c

@@ -894,9 +894,6 @@ static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_CIABR:
 		*val = get_reg_val(id, vcpu->arch.ciabr);
 		break;
-	case KVM_REG_PPC_IC:
-		*val = get_reg_val(id, vcpu->arch.ic);
-		break;
 	case KVM_REG_PPC_CSIGR:
 		*val = get_reg_val(id, vcpu->arch.csigr);
 		break;
@@ -1091,9 +1088,6 @@ static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
 		if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
 			vcpu->arch.ciabr &= ~CIABR_PRIV;	/* disable */
 		break;
-	case KVM_REG_PPC_IC:
-		vcpu->arch.ic = set_reg_val(id, *val);
-		break;
 	case KVM_REG_PPC_CSIGR:
 		vcpu->arch.csigr = set_reg_val(id, *val);
 		break;

arch/powerpc/kvm/book3s_pr.c

@@ -126,6 +126,8 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
 	 */
 	vcpu->arch.entry_tb = get_tb();
 	vcpu->arch.entry_vtb = get_vtb();
+	if (cpu_has_feature(CPU_FTR_ARCH_207S))
+		vcpu->arch.entry_ic = mfspr(SPRN_IC);
 	svcpu->in_use = true;
 }
 
@@ -178,6 +180,8 @@ void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
 	vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
 	vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
 	vcpu->arch.vtb += get_vtb() - vcpu->arch.entry_vtb;
+	if (cpu_has_feature(CPU_FTR_ARCH_207S))
+		vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
 	svcpu->in_use = false;
 
 out: