KVM: s390: vsie: support conditional-external-interception

We can easily enable cei for guest 2, so he can use it for guest 3.
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

@@ -104,6 +104,7 @@ struct kvm_s390_vm_cpu_machine {
 #define KVM_S390_VM_CPU_FEAT_GPERE	4
 #define KVM_S390_VM_CPU_FEAT_GSLS	5
 #define KVM_S390_VM_CPU_FEAT_IB		6
+#define KVM_S390_VM_CPU_FEAT_CEI	7
 struct kvm_s390_vm_cpu_feat {
 	__u64 feat[16];
 };

arch/s390/kvm/kvm-s390.c

@@ -275,6 +275,8 @@ static void kvm_s390_cpu_feat_init(void)
 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
 	if (sclp.has_ib)
 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
+	if (sclp.has_cei)
+		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
 }
 
 int kvm_arch_init(void *opaque)

arch/s390/kvm/vsie.c

@@ -324,6 +324,8 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 		scb_s->eca |= scb_o->eca & 0x00000001U;
 	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB))
 		scb_s->eca |= scb_o->eca & 0x40000000U;
+	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI))
+		scb_s->eca |= scb_o->eca & 0x80000000U;
 
 	prepare_ibc(vcpu, vsie_page);
 	rc = shadow_crycb(vcpu, vsie_page);