monitor: fix qmp/hmp query-memdev not reporting IDs of memory backends

Considering 'id' is mandatory for user_creatable objects/backends
and user_creatable_add_type() always has it as an argument
regardless of where from it is called CLI/monitor or QMP,
Fix issue by adding 'id' property to hostmem backends and
set it in user_creatable_add_type() for every object that
implements 'id' property. Then later at query-memdev time
get 'id' from object directly.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1484052795-158195-4-git-send-email-imammedo@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

backends/hostmem.c

@@ -348,6 +348,24 @@ host_memory_backend_can_be_deleted(UserCreatable *uc, Error **errp)
     }
 }
 
+static char *get_id(Object *o, Error **errp)
+{
+    HostMemoryBackend *backend = MEMORY_BACKEND(o);
+
+    return g_strdup(backend->id);
+}
+
+static void set_id(Object *o, const char *str, Error **errp)
+{
+    HostMemoryBackend *backend = MEMORY_BACKEND(o);
+
+    if (backend->id) {
+        error_setg(errp, "cannot change property value");
+        return;
+    }
+    backend->id = g_strdup(str);
+}
+
 static void
 host_memory_backend_class_init(ObjectClass *oc, void *data)
 {
@@ -377,6 +395,13 @@ host_memory_backend_class_init(ObjectClass *oc, void *data)
         HostMemPolicy_lookup,
         host_memory_backend_get_policy,
         host_memory_backend_set_policy, &error_abort);
+    object_class_property_add_str(oc, "id", get_id, set_id, &error_abort);
+}
+
+static void host_memory_backend_finalize(Object *o)
+{
+    HostMemoryBackend *backend = MEMORY_BACKEND(o);
+    g_free(backend->id);
 }
 
 static const TypeInfo host_memory_backend_info = {
@@ -387,6 +412,7 @@ static const TypeInfo host_memory_backend_info = {
     .class_init = host_memory_backend_class_init,
     .instance_size = sizeof(HostMemoryBackend),
     .instance_init = host_memory_backend_init,
+    .instance_finalize = host_memory_backend_finalize,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_USER_CREATABLE },
         { }

docs/qmp-commands.txt

@@ -3529,6 +3529,7 @@ Example (1):
          "policy": "bind"
        },
        {
+         "id": "mem1",
          "size": 536870912,
          "merge": false,
          "dump": true,

hmp.c

@@ -2078,13 +2078,11 @@ void hmp_info_memdev(Monitor *mon, const QDict *qdict)
     MemdevList *m = memdev_list;
     Visitor *v;
     char *str;
-    int i = 0;
-
 
     while (m) {
         v = string_output_visitor_new(false, &str);
         visit_type_uint16List(v, NULL, &m->value->host_nodes, NULL);
-        monitor_printf(mon, "memory backend: %d\n", i);
+        monitor_printf(mon, "memory backend: %s\n", m->value->id);
         monitor_printf(mon, "  size:  %" PRId64 "\n", m->value->size);
         monitor_printf(mon, "  merge: %s\n",
                        m->value->merge ? "true" : "false");
@@ -2100,7 +2098,6 @@ void hmp_info_memdev(Monitor *mon, const QDict *qdict)
         g_free(str);
         visit_free(v);
         m = m->next;
-        i++;
     }
 
     monitor_printf(mon, "\n");

include/sysemu/hostmem.h

@@ -52,6 +52,7 @@ struct HostMemoryBackend {
     Object parent;
 
     /* protected */
+    char *id;
     uint64_t size;
     bool merge, dump;
     bool prealloc, force_prealloc, is_mapped;

numa.c

@@ -518,6 +518,9 @@ static int query_memdev(Object *obj, void *opaque)
 
         m->value = g_malloc0(sizeof(*m->value));
 
+        m->value->id = object_property_get_str(obj, "id", NULL);
+        m->value->has_id = !!m->value->id;
+
         m->value->size = object_property_get_int(obj, "size",
                                                  &error_abort);
         m->value->merge = object_property_get_bool(obj, "merge",

qapi-schema.json

@@ -4457,6 +4457,8 @@
 #
 # Information about memory backend
 #
+# @id: #optional backend's ID if backend has 'id' property (since 2.9)
+#
 # @size: memory backend size
 #
 # @merge: enables or disables memory merge support
@@ -4473,6 +4475,7 @@
 ##
 { 'struct': 'Memdev',
   'data': {
+    '*id':        'str',
     'size':       'size',
     'merge':      'bool',
     'dump':       'bool',

qom/object_interfaces.c

@@ -62,6 +62,12 @@ Object *user_creatable_add_type(const char *type, const char *id,
 
     assert(qdict);
     obj = object_new(type);
+    if (object_property_find(obj, "id", NULL)) {
+        object_property_set_str(obj, id, "id", &local_err);
+        if (local_err) {
+            goto out;
+        }
+    }
     visit_start_struct(v, NULL, NULL, 0, &local_err);
     if (local_err) {
         goto out;