KVM: PPC: Enable the PAPR CAP for Book3S

Now that Book3S PV mode can also run PAPR guests, we can add a PAPR cap and
enable it for all Book3S targets. Enabling that CAP switches KVM into PAPR
mode.

Signed-off-by: Alexander Graf <agraf@suse.de>

arch/powerpc/kvm/powerpc.c

@@ -189,6 +189,7 @@ int kvm_dev_ioctl_check_extension(long ext)
 #else
 	case KVM_CAP_PPC_SEGSTATE:
 	case KVM_CAP_PPC_HIOR:
+	case KVM_CAP_PPC_PAPR:
 #endif
 	case KVM_CAP_PPC_UNSET_IRQ:
 	case KVM_CAP_PPC_IRQ_LEVEL:
@@ -572,6 +573,10 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 		r = 0;
 		vcpu->arch.osi_enabled = true;
 		break;
+	case KVM_CAP_PPC_PAPR:
+		r = 0;
+		vcpu->arch.papr_enabled = true;
+		break;
 	default:
 		r = -EINVAL;
 		break;

include/linux/kvm.h

@@ -555,6 +555,7 @@ struct kvm_ppc_pvinfo {
 #define KVM_CAP_PPC_RMA	65
 #define KVM_CAP_MAX_VCPUS 66       /* returns max vcpus per vm */
 #define KVM_CAP_PPC_HIOR 67
+#define KVM_CAP_PPC_PAPR 68
 #define KVM_CAP_S390_GMAP 71
 
 #ifdef KVM_CAP_IRQ_ROUTING