s390x/cpumodel: factor out determination of default model name

Now we can drop inclusion of "sysemu/kvm.h" from "s390-virtio.c".

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170818114353.13455-7-david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/s390x/s390-virtio.c

@@ -33,7 +33,6 @@
 #include "hw/boards.h"
 #include "hw/loader.h"
 #include "hw/virtio/virtio.h"
-#include "sysemu/kvm.h"
 #include "exec/address-spaces.h"
 #include "sysemu/qtest.h"
 
@@ -93,11 +92,7 @@ void s390_init_cpus(MachineState *machine)
     gchar *name;
 
     if (machine->cpu_model == NULL) {
-        if (kvm_enabled()) {
-            machine->cpu_model = "host";
-        } else {
-            machine->cpu_model = "qemu";
-        }
+        machine->cpu_model = s390_default_cpu_model_name();
     }
 
     cpu_states = g_new0(S390CPU *, max_cpus);

target/s390x/cpu.h

@@ -647,6 +647,7 @@ void s390_cpu_model_register_props(Object *obj);
 void s390_cpu_model_class_register_props(ObjectClass *oc);
 void s390_realize_cpu_model(CPUState *cs, Error **errp);
 ObjectClass *s390_cpu_class_by_name(const char *name);
+const char *s390_default_cpu_model_name(void);
 
 #define EXCP_EXT 1 /* external interrupt */
 #define EXCP_SVC 2 /* supervisor call (syscall) */

target/s390x/cpu_models.c

@@ -1200,6 +1200,14 @@ ObjectClass *s390_cpu_class_by_name(const char *name)
     return oc;
 }
 
+const char *s390_default_cpu_model_name(void)
+{
+     if (kvm_enabled()) {
+        return "host";
+     }
+     return "qemu";
+}
+
 static const TypeInfo qemu_s390_cpu_type_info = {
     .name = S390_CPU_TYPE_NAME("qemu"),
     .parent = TYPE_S390_CPU,