target/s390x/kvm: Refactor AP functionalities

kvm_s390_set_attr() is a misleading name as it only sets attributes for
the KVM_S390_VM_CRYPTO group. Therefore, rename it to
kvm_s390_set_crypto_attr().

Add new functions ap_available() and ap_enabled() to avoid code
duplication later.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Message-ID: <20230823142219.1046522-5-seiden@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

target/s390x/kvm/kvm.c

@@ -240,7 +240,7 @@ static void kvm_s390_enable_cmma(void)
     trace_kvm_enable_cmma(rc);
 }
 
-static void kvm_s390_set_attr(uint64_t attr)
+static void kvm_s390_set_crypto_attr(uint64_t attr)
 {
     struct kvm_device_attr attribute = {
         .group = KVM_S390_VM_CRYPTO,
@@ -265,7 +265,7 @@ static void kvm_s390_init_aes_kw(void)
     }
 
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
-            kvm_s390_set_attr(attr);
+            kvm_s390_set_crypto_attr(attr);
     }
 }
 
@@ -279,7 +279,7 @@ static void kvm_s390_init_dea_kw(void)
     }
 
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
-            kvm_s390_set_attr(attr);
+            kvm_s390_set_crypto_attr(attr);
     }
 }
 
@@ -2288,6 +2288,17 @@ static int configure_cpu_subfunc(const S390FeatBitmap features)
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
+static bool ap_available(void)
+{
+    return kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO,
+                             KVM_S390_VM_CRYPTO_ENABLE_APIE);
+}
+
+static bool ap_enabled(const S390FeatBitmap features)
+{
+    return test_bit(S390_FEAT_AP, features);
+}
+
 static int kvm_to_feat[][2] = {
     { KVM_S390_VM_CPU_FEAT_ESOP, S390_FEAT_ESOP },
     { KVM_S390_VM_CPU_FEAT_SIEF2, S390_FEAT_SIE_F2 },
@@ -2467,8 +2478,7 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
         return;
     }
     /* for now, we can only provide the AP feature with HW support */
-    if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO,
-        KVM_S390_VM_CRYPTO_ENABLE_APIE)) {
+    if (ap_available()) {
         set_bit(S390_FEAT_AP, model->features);
     }
 
@@ -2494,7 +2504,7 @@ static void kvm_s390_configure_apie(bool interpret)
                                 KVM_S390_VM_CRYPTO_DISABLE_APIE;
 
     if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
-        kvm_s390_set_attr(attr);
+        kvm_s390_set_crypto_attr(attr);
     }
 }
 
@@ -2548,7 +2558,7 @@ void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp)
         kvm_s390_enable_cmma();
     }
 
-    if (test_bit(S390_FEAT_AP, model->features)) {
+    if (ap_enabled(model->features)) {
         kvm_s390_configure_apie(true);
     }
 }