KVM: s390: vsie: support shared IPTE-interlock facility
As we forward the whole SCA provided by guest 2, we can directly forward
SIIF 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>
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index e0c5a57..d735612 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -267,6 +267,8 @@
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
if (sclp.has_64bscao)
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
+ if (sclp.has_siif)
+ allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
}
int kvm_arch_init(void *opaque)
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 44e66c3..1615ed3 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -315,6 +315,8 @@
/* Run-time-Instrumentation */
if (test_kvm_facility(vcpu->kvm, 64))
scb_s->ecb3 |= scb_o->ecb3 & 0x01U;
+ if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF))
+ scb_s->eca |= scb_o->eca & 0x00000001U;
prepare_ibc(vcpu, vsie_page);
rc = shadow_crycb(vcpu, vsie_page);