KVM: s390: vsie: support guest-PER-enhancement

We can easily forward the guest-PER-enhancement facility to guest 2 if
available.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

arch/s390/include/uapi/asm/kvm.h

@@ -101,6 +101,7 @@ struct kvm_s390_vm_cpu_machine {
 #define KVM_S390_VM_CPU_FEAT_SIEF2	1
 #define KVM_S390_VM_CPU_FEAT_64BSCAO	2
 #define KVM_S390_VM_CPU_FEAT_SIIF	3
+#define KVM_S390_VM_CPU_FEAT_GPERE	4
 struct kvm_s390_vm_cpu_feat {
 	__u64 feat[16];
 };

arch/s390/kvm/kvm-s390.c

@@ -269,6 +269,8 @@ static void kvm_s390_cpu_feat_init(void)
 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
 	if (sclp.has_siif)
 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
+	if (sclp.has_gpere)
+		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
 }
 
 int kvm_arch_init(void *opaque)

arch/s390/kvm/vsie.c

@@ -107,6 +107,8 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 			return set_validity_icpt(scb_s, 0x0001U);
 		newflags |= CPUSTAT_GED2;
 	}
+	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE))
+		newflags |= cpuflags & CPUSTAT_P;
 
 	atomic_set(&scb_s->cpuflags, newflags);
 	return 0;