moxie: fix qemu-system-moxie failing to start with CLI "-cpu MoxieLite"

It 'works' with default CPU only because of bug in
moxie_cpu_class_by_name() where it treats cpu_model
as type name and default cpu_model also happens to be
type name. But specifying explicitly cpu on CLI,
ex: '-cpu MoxieLite', makes QEMU fail since
moxie_cpu_class_by_name() doesn't traslate cpu_model
to cpu type and fails to find corresponding object class.

Fix moxie_cpu_class_by_name() to do proper
   cpu_model -> cpu type
translation and fix default cpu_model to be cpu_model
instead of being typename.
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <1507211474-188400-15-git-send-email-imammedo@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

hw/moxie/moxiesim.c

@@ -116,7 +116,7 @@ static void moxiesim_init(MachineState *machine)
 
     /* Init CPUs. */
     if (cpu_model == NULL) {
-        cpu_model = "MoxieLite-moxie-cpu";
+        cpu_model = "MoxieLite";
     }
     cpu = MOXIE_CPU(cpu_generic_init(TYPE_MOXIE_CPU, cpu_model));
     env = &cpu->env;

target/moxie/cpu.c

@@ -83,7 +83,12 @@ static void moxie_cpu_initfn(Object *obj)
 
 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
 {
-    ObjectClass *oc = object_class_by_name(cpu_model);
+    ObjectClass *oc;
+    char *typename;
+
+    typename = g_strdup_printf("%s-" TYPE_MOXIE_CPU, cpu_model);
+    oc = object_class_by_name(typename);
+    g_free(typename);
     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
                        object_class_is_abstract(oc))) {
         return NULL;