The Xen ioreq-server API, introduced in Xen 4.5, requires that PCI device
models explicitly register with Xen for config space accesses. This patch
adds a listener interface into qdev-core which can be used by the Xen
interface code to monitor for arrival and departure of PCI devices.
Signed-off-by: Paul Durrant <paul.durr...@citrix.com>
Cc: Michael S. Tsirkin <m...@redhat.com>
Cc: Andreas Faerber" <afaer...@suse.de>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: Markus Armbruster <arm...@redhat.com>
Cc: Thomas Huth <th...@linux.vnet.ibm.com>
Cc: Christian Borntraeger <borntrae...@de.ibm.com>
---
hw/core/qdev.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++
include/hw/qdev-core.h | 10 +++++++++
include/qemu/typedefs.h | 1 +
3 files changed, 65 insertions(+)
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index fcb1638..4a9c1f6 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -175,6 +175,56 @@ int qdev_init(DeviceState *dev)
return 0;
}
+static QTAILQ_HEAD(qdev_listeners, DeviceListener) qdev_listeners
+ = QTAILQ_HEAD_INITIALIZER(qdev_listeners);
+
+enum ListenerDirection { Forward, Reverse };
+
+#define QDEV_LISTENER_CALL(_callback, _direction, _args...) \
+ do { \
+ DeviceListener *_listener; \
+ \
+ switch (_direction) { \
+ case Forward: \
+ QTAILQ_FOREACH(_listener, &qdev_listeners, link) { \
+ if (_listener->_callback) { \
+ _listener->_callback(_listener, ##_args); \
+ } \
+ } \
+ break; \
+ case Reverse: \
+ QTAILQ_FOREACH_REVERSE(_listener, &qdev_listeners, \
+ qdev_listeners, link) { \
+ if (_listener->_callback) { \
+ _listener->_callback(_listener, ##_args); \
+ } \
+ } \
+ break; \
+ default: \
+ abort(); \
+ } \
+ } while (0)
+
+static int qdev_listener_add(DeviceState *dev, void *opaque)
+{
+ QDEV_LISTENER_CALL(realize, Forward, dev);
+
+ return 0;
+}
+
+void qdev_listener_register(DeviceListener *listener)
+{
+ QTAILQ_INSERT_TAIL(&qdev_listeners, listener, link);
+
+ qbus_walk_children(sysbus_get_default(), NULL, NULL, qdev_listener_add,
+ NULL, NULL);
+}
+
+void qdev_listener_unregister(DeviceListener *listener)
+{
+ QTAILQ_REMOVE(&qdev_listeners, listener, link);
+}
+
static void device_realize(DeviceState *dev, Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
@@ -186,12 +236,16 @@ static void device_realize(DeviceState *dev, Error **errp)
return;
}
}
+
+ QDEV_LISTENER_CALL(realize, Forward, dev);
}
static void device_unrealize(DeviceState *dev, Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
+ QDEV_LISTENER_CALL(unrealize, Reverse, dev);
+
if (dc->exit) {
int rc = dc->exit(dev);
if (rc < 0) {
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 178fee2..f2dc267 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -167,6 +167,12 @@ struct DeviceState {
int alias_required_for_version;
};
+struct DeviceListener {
+ void (*realize)(DeviceListener *listener, DeviceState *dev);
+ void (*unrealize)(DeviceListener *listener, DeviceState *dev);
+ QTAILQ_ENTRY(DeviceListener) link;
+};
+
#define TYPE_BUS "bus"
#define BUS(obj) OBJECT_CHECK(BusState, (obj), TYPE_BUS)
#define BUS_CLASS(klass) OBJECT_CLASS_CHECK(BusClass, (klass), TYPE_BUS)
@@ -368,4 +374,8 @@ static inline void qbus_set_hotplug_handler(BusState *bus,
DeviceState *handler,
QDEV_HOTPLUG_HANDLER_PROPERTY, errp);
bus->allow_hotplug = 1;
}
+
+void qdev_listener_register(DeviceListener *listener);
+void qdev_listener_unregister(DeviceListener *listener);
+
#endif
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index 04df51b..e32bca2 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -20,6 +20,7 @@ typedef struct Property Property;
typedef struct PropertyInfo PropertyInfo;
typedef struct CompatProperty CompatProperty;
typedef struct DeviceState DeviceState;
+typedef struct DeviceListener DeviceListener;
typedef struct BusState BusState;
typedef struct BusClass BusClass;
--
1.7.10.4
