[PULL 01/15] vmbus: Don't make QOM property registration conditional

[Eduardo Habkost]

Having properties registered conditionally makes QOM type
introspection difficult.  Instead of skipping registration of the
"instanceid" property, always register the property but validate
its value against the instance id required by the class.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Message-Id: <20201009200701.1830060-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 hw/hyperv/vmbus.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
index 984caf898dc..c9887d5a7bc 100644
--- a/hw/hyperv/vmbus.c
+++ b/hw/hyperv/vmbus.c
@@ -2372,6 +2372,14 @@ static void vmbus_dev_realize(DeviceState *dev, Error 
**errp)
 
     assert(!qemu_uuid_is_null(&vdev->instanceid));
 
+    if (!qemu_uuid_is_null(&vdc->instanceid)) {
+        /* Class wants to only have a single instance with a fixed UUID */
+        if (!qemu_uuid_is_equal(&vdev->instanceid, &vdc->instanceid)) {
+            error_setg(&err, "instance id can't be changed");
+            goto error_out;
+        }
+    }
+
     /* Check for instance id collision for this class id */
     QTAILQ_FOREACH(child, &BUS(vmbus)->children, sibling) {
         VMBusDevice *child_dev = VMBUS_DEVICE(child->child);
@@ -2438,18 +2446,22 @@ static void vmbus_dev_unrealize(DeviceState *dev)
     free_channels(vdev);
 }
 
+static Property vmbus_dev_props[] = {
+    DEFINE_PROP_UUID("instanceid", VMBusDevice, instanceid),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+
 static void vmbus_dev_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *kdev = DEVICE_CLASS(klass);
+    device_class_set_props(kdev, vmbus_dev_props);
     kdev->bus_type = TYPE_VMBUS;
     kdev->realize = vmbus_dev_realize;
     kdev->unrealize = vmbus_dev_unrealize;
     kdev->reset = vmbus_dev_reset;
 }
 
-static Property vmbus_dev_instanceid =
-                        DEFINE_PROP_UUID("instanceid", VMBusDevice, 
instanceid);
-
 static void vmbus_dev_instance_init(Object *obj)
 {
     VMBusDevice *vdev = VMBUS_DEVICE(obj);
@@ -2458,8 +2470,6 @@ static void vmbus_dev_instance_init(Object *obj)
     if (!qemu_uuid_is_null(&vdc->instanceid)) {
         /* Class wants to only have a single instance with a fixed UUID */
         vdev->instanceid = vdc->instanceid;
-    } else {
-        qdev_property_add_static(DEVICE(vdev), &vmbus_dev_instanceid);
     }
 }
 
-- 
2.31.1