qdev: add qdev_build_hotpluggable_device_list helper

For peripheral device del completion, add a function to build a list for
hotpluggable devices.
Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Reviewed-by: Marcel Apfelbaum <marcel.a@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

hw/core/qdev.c

@@ -866,6 +866,19 @@ void qdev_alias_all_properties(DeviceState *target, Object *source)
     } while (class != object_class_by_name(TYPE_DEVICE));
 }
 
+int qdev_build_hotpluggable_device_list(Object *obj, void *opaque)
+{
+    GSList **list = opaque;
+    DeviceState *dev = DEVICE(obj);
+
+    if (dev->realized && object_property_get_bool(obj, "hotpluggable", NULL)) {
+        *list = g_slist_append(*list, dev);
+    }
+
+    object_child_foreach(obj, qdev_build_hotpluggable_device_list, opaque);
+    return 0;
+}
+
 static bool device_get_realized(Object *obj, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);

include/hw/qdev-core.h

@@ -360,6 +360,8 @@ extern int qdev_hotplug;
 
 char *qdev_get_dev_path(DeviceState *dev);
 
+int qdev_build_hotpluggable_device_list(Object *obj, void *opaque);
+
 void qbus_set_hotplug_handler(BusState *bus, DeviceState *handler,
                               Error **errp);