[Qemu-devel] [RFC PATCH 11/15] qdev: add qbus_set_hotplug_handler_generic()

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Certain devices types, like memory/CPU, are now being handled using a
hotplug interface provided by a top-level MachineClass. Hotpluggable
host bridges are another such device where it makes sense to use a
machine-level hotplug handler. However, unlike those devices,
host-bridges have a parent bus (the main system bus), and devices with
a parent bus use a different mechanism for registering their hotplug
handlers: qbus_set_hotplug_handler(). This interface currently expects
a handler to be a subclass of DeviceClass, but this is not the case
for MachineClass, which derives directly from ObjectClass.

Internally, the interface only requires an ObjectClass, so expose that
support via a new qbus_set_hotplug_handler_generic().

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/core/qdev.c         | 9 ++++-----
 include/hw/qdev-core.h | 2 ++
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index fda1d2f..8fd9320 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -108,22 +108,21 @@ void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
     bus_add_child(bus, dev);
 }
 
-static void qbus_set_hotplug_handler_internal(BusState *bus, Object *handler,
-                                              Error **errp)
+void qbus_set_hotplug_handler_generic(BusState *bus, Object *handler,
+                                      Error **errp)
 {
-
     object_property_set_link(OBJECT(bus), OBJECT(handler),
                              QDEV_HOTPLUG_HANDLER_PROPERTY, errp);
 }
 
 void qbus_set_hotplug_handler(BusState *bus, DeviceState *handler, Error **errp)
 {
-    qbus_set_hotplug_handler_internal(bus, OBJECT(handler), errp);
+    qbus_set_hotplug_handler_generic(bus, OBJECT(handler), errp);
 }
 
 void qbus_set_bus_hotplug_handler(BusState *bus, Error **errp)
 {
-    qbus_set_hotplug_handler_internal(bus, OBJECT(bus), errp);
+    qbus_set_hotplug_handler_generic(bus, OBJECT(bus), errp);
 }
 
 /* Create a new device.  This only initializes the device state structure
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 17f805e..3b210bf 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -377,6 +377,8 @@ GSList *qdev_build_hotpluggable_device_list(Object *peripheral);
 
 void qbus_set_hotplug_handler(BusState *bus, DeviceState *handler,
                               Error **errp);
+void qbus_set_hotplug_handler_generic(BusState *bus, Object *handler,
+                                      Error **errp);
 
 void qbus_set_bus_hotplug_handler(BusState *bus, Error **errp);
 
-- 
1.9.1