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Re: [Qemu-devel] [PATCH v5 1/2] Add device listener interface
From: |
Andreas Färber |
Subject: |
Re: [Qemu-devel] [PATCH v5 1/2] Add device listener interface |
Date: |
Tue, 09 Dec 2014 18:54:53 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
Am 09.12.2014 um 18:40 schrieb Paolo Bonzini:
> On 08/12/2014 12:12, Paul Durrant wrote:
>>> -----Original Message-----
>>> From: Paolo Bonzini [mailto:address@hidden
>>> Sent: 05 December 2014 11:45
>>> To: Paul Durrant; address@hidden
>>> Cc: Michael S. Tsirkin; Andreas Faerber"; Peter Crosthwaite; Igor
>>> Mammedov; Markus Armbruster; Thomas Huth; Christian Borntraeger
>>> Subject: Re: [PATCH v5 1/2] Add device listener interface
>>>
>>>
>>>
>>> On 05/12/2014 11:50, Paul Durrant wrote:
>>>> 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 <address@hidden>
>>>> Cc: Michael S. Tsirkin <address@hidden>
>>>> Cc: Andreas Faerber" <address@hidden>
>>>> Cc: Paolo Bonzini <address@hidden>
>>>> Cc: Peter Crosthwaite <address@hidden>
>>>> Cc: Igor Mammedov <address@hidden>
>>>> Cc: Markus Armbruster <address@hidden>
>>>> Cc: Thomas Huth <address@hidden>
>>>> Cc: Christian Borntraeger <address@hidden>
>>>> ---
>>>> hw/core/qdev.c | 53
>>> +++++++++++++++++++++++++++++++++++++++++++++++
>>>> include/hw/qdev-core.h | 10 +++++++++
>>>> include/qemu/typedefs.h | 1 +
>>>> 3 files changed, 64 insertions(+)
>>>>
>>>> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
>>>> index 35fd00d..76ff9ef 100644
>>>> --- a/hw/core/qdev.c
>>>> +++ b/hw/core/qdev.c
>>>> @@ -189,6 +189,56 @@ int qdev_init(DeviceState *dev)
>>>> return 0;
>>>> }
>>>>
>>>> +static QTAILQ_HEAD(device_listeners, DeviceListener) device_listeners
>>>> + = QTAILQ_HEAD_INITIALIZER(device_listeners);
>>>> +
>>>> +enum ListenerDirection { Forward, Reverse };
>>>> +
>>>> +#define DEVICE_LISTENER_CALL(_callback, _direction, _args...) \
>>>> + do { \
>>>> + DeviceListener *_listener; \
>>>> + \
>>>> + switch (_direction) { \
>>>> + case Forward: \
>>>> + QTAILQ_FOREACH(_listener, &device_listeners, link) { \
>>>> + if (_listener->_callback) { \
>>>> + _listener->_callback(_listener, ##_args); \
>>>> + } \
>>>> + } \
>>>> + break; \
>>>> + case Reverse: \
>>>> + QTAILQ_FOREACH_REVERSE(_listener, &device_listeners, \
>>>> + device_listeners, link) { \
>>>> + if (_listener->_callback) { \
>>>> + _listener->_callback(_listener, ##_args); \
>>>> + } \
>>>> + } \
>>>> + break; \
>>>> + default: \
>>>> + abort(); \
>>>> + } \
>>>> + } while (0)
>>>> +
>>>> +static int device_listener_add(DeviceState *dev, void *opaque)
>>>> +{
>>>> + DEVICE_LISTENER_CALL(realize, Forward, dev);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +void device_listener_register(DeviceListener *listener)
>>>> +{
>>>> + QTAILQ_INSERT_TAIL(&device_listeners, listener, link);
>>>> +
>>>> + qbus_walk_children(sysbus_get_default(), NULL, NULL,
>>> device_listener_add,
>>>> + NULL, NULL);
>>>> +}
>>>> +
>>>> +void device_listener_unregister(DeviceListener *listener)
>>>> +{
>>>> + QTAILQ_REMOVE(&device_listeners, listener, link);
>>>> +}
>>>> +
>>>> static void device_realize(DeviceState *dev, Error **errp)
>>>> {
>>>> DeviceClass *dc = DEVICE_GET_CLASS(dev);
>>>> @@ -994,6 +1044,8 @@ static void device_set_realized(Object *obj, bool
>>> value, Error **errp)
>>>> goto fail;
>>>> }
>>>>
>>>> + DEVICE_LISTENER_CALL(realize, Forward, dev);
>>>> +
>>>> hotplug_ctrl = qdev_get_hotplug_handler(dev);
>>>> if (hotplug_ctrl) {
>>>> hotplug_handler_plug(hotplug_ctrl, dev, &local_err);
>>>> @@ -1035,6 +1087,7 @@ static void device_set_realized(Object *obj, bool
>>> value, Error **errp)
>>>> dc->unrealize(dev, local_errp);
>>>> }
>>>> dev->pending_deleted_event = true;
>>>> + DEVICE_LISTENER_CALL(unrealize, Reverse, dev);
>>>> }
>>>>
>>>> if (local_err != NULL) {
>>>> diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
>>>> index 589bbe7..15a226f 100644
>>>> --- a/include/hw/qdev-core.h
>>>> +++ b/include/hw/qdev-core.h
>>>> @@ -165,6 +165,12 @@ 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)
>>>> @@ -376,4 +382,8 @@ static inline bool qbus_is_hotpluggable(BusState
>>> *bus)
>>>> {
>>>> return bus->hotplug_handler;
>>>> }
>>>> +
>>>> +void device_listener_register(DeviceListener *listener);
>>>> +void device_listener_unregister(DeviceListener *listener);
>>>> +
>>>> #endif
>>>> diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
>>>> index 3475177..4bb4938 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;
>>>>
>>>>
>>>
>>> Reviewed-by: Paolo Bonzini <address@hidden>
>>>
>>
>> Great. Thanks for that. All I need now is an ack on this from a maintainer.
>
> I think my reviewed-by is pretty close to an Ack.
>
> Stefano, feel free to pick this patch up together with 2/2.
In that case,
Reviewed-by: Andreas Färber <address@hidden>
If I should still pick it up, just let me know.
Regards,
Andreas
--
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 21284 AG Nürnberg
[Qemu-devel] [PATCH v5 2/2] Xen: Use the ioreq-server API when available, Paul Durrant, 2014/12/05