[Qemu-devel] [PATCH v3 4/7] s390x/kvm: interface to interpret AP instructions

[Tony Krowiak]

The VFIO AP device exploits interpretive execution of AP
instructions (APIE). APIE is enabled by setting a device attribute
via the KVM_SET_DEVICE_ATTR ioctl.

Signed-off-by: Tony Krowiak <address@hidden>
---
 target/s390x/kvm.c       |   16 ++++++++++++++++
 target/s390x/kvm_s390x.h |    2 ++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index 33e5ec3..2812e28 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -277,6 +277,22 @@ static void kvm_s390_init_dea_kw(void)
     }
 }
 
+int kvm_s390_set_interpret_ap(uint8_t enable)
+{
+    struct kvm_device_attr attribute = {
+        .group = KVM_S390_VM_CRYPTO,
+        .attr  = KVM_S390_VM_CRYPTO_INTERPRET_AP,
+        .addr = 1,
+    };
+
+    if (!kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO,
+                           KVM_S390_VM_CRYPTO_INTERPRET_AP)) {
+        return -EOPNOTSUPP;
+    }
+
+    return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attribute);
+}
+
 void kvm_s390_crypto_reset(void)
 {
     if (s390_has_feat(S390_FEAT_MSA_EXT_3)) {
diff --git a/target/s390x/kvm_s390x.h b/target/s390x/kvm_s390x.h
index 34ee7e7..0d6c6e7 100644
--- a/target/s390x/kvm_s390x.h
+++ b/target/s390x/kvm_s390x.h
@@ -40,4 +40,6 @@ void kvm_s390_crypto_reset(void);
 void kvm_s390_restart_interrupt(S390CPU *cpu);
 void kvm_s390_stop_interrupt(S390CPU *cpu);
 
+int kvm_s390_set_interpret_ap(uint8_t enable);
+
 #endif /* KVM_S390X_H */
-- 
1.7.1