libvirt has a long-standing bug: when removing the device, it can request removal but does not know when the removal completes. Add an event so we can fix this in a robust way. Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com&gt; --- QMP/qmp-events.txt | 16 ++++++++++++++++ hw/qdev.c | 11 +++++++++++ include/monitor/monitor.h | 1 + monitor.c | 1 + qapi-schema.json | 4 +++- 5 files changed, 32 insertions(+), 1 deletion(-) diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt index b2698e4..24cf3e8 100644 --- a/QMP/qmp-events.txt +++ b/QMP/qmp-events.txt @@ -136,6 +136,22 @@ Example: Note: The "ready to complete" status is always reset by a BLOCK_JOB_ERROR event. +DEVICE_DELETED +----------------- + +Emitted whenever the device removal completion is acknowledged +by the guest. +At this point, it's safe to reuse the specified device ID. +Device removal can be initiated by the guest or by HMP/QMP commands. + +Data: + +- "device": device name (json-string, optional) + +{ "event": "DEVICE_DELETED", + "data": { "device": "virtio-net-pci-0" }, + "timestamp": { "seconds": 1265044230, "microseconds": 450486 } } + DEVICE_TRAY_MOVED ----------------- diff --git a/hw/qdev.c b/hw/qdev.c index 0b20280..5e8a89c 100644 --- a/hw/qdev.c +++ b/hw/qdev.c @@ -30,6 +30,8 @@ #include "qapi/error.h" #include "qapi/qmp/qerror.h" #include "qapi/visitor.h" +#include "qapi/qmp/qjson.h" +#include "monitor/monitor.h" int qdev_hotplug = 0; static bool qdev_hot_added = false; @@ -761,6 +763,7 @@ static void device_unparent(Object *obj) DeviceState *dev = DEVICE(obj); DeviceClass *dc = DEVICE_GET_CLASS(dev); BusState *bus; + QObject *event_data; while (dev->num_child_bus) { bus = QLIST_FIRST(&dev->child_bus); @@ -779,6 +782,14 @@ static void device_unparent(Object *obj) object_unref(OBJECT(dev->parent_bus)); dev->parent_bus = NULL; } + + if (dev->id) { + event_data = qobject_from_jsonf("{ 'device': %s }", dev->id); + } else { + event_data = qobject_from_jsonf("{ }"); + } + monitor_protocol_event(QEVENT_DEVICE_DELETED, event_data); + qobject_decref(event_data); } static void device_class_init(ObjectClass *class, void *data) diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h index 87fb49c..b868760 100644 --- a/include/monitor/monitor.h +++ b/include/monitor/monitor.h @@ -39,6 +39,7 @@ typedef enum MonitorEvent { QEVENT_BLOCK_JOB_CANCELLED, QEVENT_BLOCK_JOB_ERROR, QEVENT_BLOCK_JOB_READY, + QEVENT_DEVICE_DELETED, QEVENT_DEVICE_TRAY_MOVED, QEVENT_SUSPEND, QEVENT_SUSPEND_DISK, diff --git a/monitor.c b/monitor.c index 112e920..2fdfb79 100644 --- a/monitor.c +++ b/monitor.c @@ -458,6 +458,7 @@ static const char *monitor_event_names[] = { [QEVENT_BLOCK_JOB_CANCELLED] = "BLOCK_JOB_CANCELLED", [QEVENT_BLOCK_JOB_ERROR] = "BLOCK_JOB_ERROR", [QEVENT_BLOCK_JOB_READY] = "BLOCK_JOB_READY", + [QEVENT_DEVICE_DELETED] = "DEVICE_DELETED", [QEVENT_DEVICE_TRAY_MOVED] = "DEVICE_TRAY_MOVED", [QEVENT_SUSPEND] = "SUSPEND", [QEVENT_SUSPEND_DISK] = "SUSPEND_DISK", diff --git a/qapi-schema.json b/qapi-schema.json index fdaa9da..080dc39 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -2354,7 +2354,9 @@ # Notes: When this command completes, the device may not be removed from the # guest. Hot removal is an operation that requires guest cooperation. # This command merely requests that the guest begin the hot removal -# process. +# process. Completion of the device removal process is signaled with a +# DEVICE_DELETED event. Guest reset will automatically complete removal +# for all devices. # # Since: 0.14.0 ## -- MST

Make sure object is valid when destructor is called. Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com&gt; --- qom/object.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/qom/object.c b/qom/object.c index 3d638ff..a0e3cbe 100644 --- a/qom/object.c +++ b/qom/object.c @@ -363,12 +363,12 @@ static void object_property_del_child(Object *obj, Object *child, Error **errp) void object_unparent(Object *obj) { object_ref(obj); - if (obj->parent) { - object_property_del_child(obj->parent, obj, NULL); - } if (obj->class->unparent) { (obj->class->unparent)(obj); } + if (obj->parent) { + object_property_del_child(obj->parent, obj, NULL); + } object_unref(obj); } -- MST

On Thu, Mar 21, 2013 at 01:25:50PM +0100, Paolo Bonzini wrote: Worth respinning for?

Add QOM path to device deleted event. It now becomes useful to report it for devices which don't have an ID assigned. Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com&gt; --- QMP/qmp-events.txt | 4 +++- hw/qdev.c | 7 +++++-- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt index 24cf3e8..dcc826d 100644 --- a/QMP/qmp-events.txt +++ b/QMP/qmp-events.txt @@ -147,9 +147,11 @@ Device removal can be initiated by the guest or by HMP/QMP commands. Data: - "device": device name (json-string, optional) +- "path": device path (json-string) { "event": "DEVICE_DELETED", - "data": { "device": "virtio-net-pci-0" }, + "data": { "device": "virtio-net-pci-0", + "path": "/machine/peripheral/virtio-net-pci-0" }, "timestamp": { "seconds": 1265044230, "microseconds": 450486 } } DEVICE_TRAY_MOVED diff --git a/hw/qdev.c b/hw/qdev.c index 5e8a89c..0cdf568 100644 --- a/hw/qdev.c +++ b/hw/qdev.c @@ -764,6 +764,7 @@ static void device_unparent(Object *obj) DeviceClass *dc = DEVICE_GET_CLASS(dev); BusState *bus; QObject *event_data; + gchar *path = object_get_canonical_path(obj); while (dev->num_child_bus) { bus = QLIST_FIRST(&dev->child_bus); @@ -784,12 +785,14 @@ static void device_unparent(Object *obj) } if (dev->id) { - event_data = qobject_from_jsonf("{ 'device': %s }", dev->id); + event_data = qobject_from_jsonf("{ 'device': %s, 'path': %s }", + dev->id, path); } else { - event_data = qobject_from_jsonf("{ }"); + event_data = qobject_from_jsonf("{ 'path': %s }", path); } monitor_protocol_event(QEVENT_DEVICE_DELETED, event_data); qobject_decref(event_data); + g_free(path); } static void device_class_init(ObjectClass *class, void *data) -- MST