qdev: integrate with QEMU Object Model (v2)

This is a very shallow integration.  We register a TYPE_DEVICE but only use
QOM as basically a memory allocator.  This will make all devices show up as
QOM objects but they will all carry the TYPE_DEVICE.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - update for new location of object.h

hw/qdev.c

@@ -47,9 +47,17 @@ static BusState *qbus_find(const char *path);
 /* Register a new device type.  */
 void qdev_register(DeviceInfo *info)
 {
+    TypeInfo type_info = {};
+
     assert(info->size >= sizeof(DeviceState));
     assert(!info->next);
 
+    type_info.name = info->name;
+    type_info.parent = TYPE_DEVICE;
+    type_info.instance_size = info->size;
+
+    type_register_static(&type_info);
+
     info->next = device_info_list;
     device_info_list = info;
 }
@@ -93,7 +101,7 @@ static DeviceState *qdev_create_from_info(BusState *bus, DeviceInfo *info)
     Property *prop;
 
     assert(bus->info == info->bus_info);
-    dev = g_malloc0(info->size);
+    dev = DEVICE(object_new(info->name));
     dev->info = info;
     dev->parent_bus = bus;
     qdev_prop_set_defaults(dev, dev->info->props);
@@ -519,7 +527,7 @@ void qdev_free(DeviceState *dev)
     if (dev->ref != 0) {
         qerror_report(QERR_DEVICE_IN_USE, dev->id?:"");
     }
-    g_free(dev);
+    object_delete(OBJECT(dev));
 }
 
 void qdev_machine_creation_done(void)
@@ -1572,3 +1580,18 @@ void qdev_machine_init(void)
     qdev_get_peripheral_anon();
     qdev_get_peripheral();
 }
+
+static TypeInfo device_type_info = {
+    .name = TYPE_DEVICE,
+    .parent = TYPE_OBJECT,
+    .instance_size = sizeof(DeviceState),
+    .abstract = true,
+    .class_size = sizeof(DeviceClass),
+};
+
+static void init_qdev(void)
+{
+    type_register_static(&device_type_info);
+}
+
+device_init(init_qdev);

hw/qdev.h

@@ -6,6 +6,7 @@
 #include "qemu-char.h"
 #include "qemu-option.h"
 #include "qapi/qapi-visit-core.h"
+#include "qemu/object.h"
 
 typedef struct Property Property;
 
@@ -66,9 +67,18 @@ typedef struct DeviceProperty
     QTAILQ_ENTRY(DeviceProperty) node;
 } DeviceProperty;
 
+#define TYPE_DEVICE "device"
+#define DEVICE(obj) OBJECT_CHECK(DeviceState, (obj), TYPE_DEVICE)
+
+typedef struct DeviceClass {
+    ObjectClass parent_class;
+} DeviceClass;
+
 /* This structure should not be accessed directly.  We declare it here
    so that it can be embedded in individual device state structures.  */
 struct DeviceState {
+    Object parent_obj;
+
     const char *id;
     enum DevState state;
     QemuOpts *opts;