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qapi: introduce device-sync-config

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Add command to sync config from vhost-user backend to the device. It
may be helpful when VHOST_USER_SLAVE_CONFIG_CHANGE_MSG failed or not
triggered interrupt to the guest or just not available (not supported
by vhost-user server).

Command result is racy if allow it during migration. Let's not allow
that.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Raphael Norwitz <raphael@enfabrica.net>
Message-Id: <20240920094936.450987-4-vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2024-09-20 12:49:36 +03:00 • committed by Michael S. Tsirkin
parent 4dfa127314
commit 3f98408e2e
5 changed files with 78 additions and 0 deletions
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6
include/hw/qdev-core.h
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@ -95,6 +95,7 @@ typedef void (*DeviceUnrealize)(DeviceState *dev);
typedef void (*DeviceReset)(DeviceState *dev);
typedef void (*BusRealize)(BusState *bus, Error **errp);
typedef void (*BusUnrealize)(BusState *bus);
typedef int (*DeviceSyncConfig)(DeviceState *dev, Error **errp);
/**
* struct DeviceClass - The base class for all devices.
@ -103,6 +104,9 @@ typedef void (*BusUnrealize)(BusState *bus);
* property is changed to %true.
* @unrealize: Callback function invoked when the #DeviceState:realized
* property is changed to %false.
* @sync_config: Callback function invoked when QMP command device-sync-config
* is called. Should synchronize device configuration from host to guest part
* and notify the guest about the change.
* @hotpluggable: indicates if #DeviceClass is hotpluggable, available
* as readonly "hotpluggable" property of #DeviceState instance
*
@ -162,6 +166,7 @@ struct DeviceClass {
DeviceReset legacy_reset;
DeviceRealize realize;
DeviceUnrealize unrealize;
DeviceSyncConfig sync_config;
/**
* @vmsd: device state serialisation description for
@ -547,6 +552,7 @@ bool qdev_hotplug_allowed(DeviceState *dev, Error **errp);
*/
HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev);
void qdev_unplug(DeviceState *dev, Error **errp);
int qdev_sync_config(DeviceState *dev, Error **errp);
void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp);
void qdev_machine_creation_done(void);