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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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38
system/qdev-monitor.c
View file

@ -23,6 +23,7 @@
#include "monitor/monitor.h"
#include "monitor/qdev.h"
#include "sysemu/arch_init.h"
#include "sysemu/runstate.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-qdev.h"
#include "qapi/qmp/dispatch.h"
@ -977,6 +978,43 @@ void qmp_device_del(const char *id, Error **errp)
}
}
int qdev_sync_config(DeviceState *dev, Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
if (!dc->sync_config) {
error_setg(errp, "device-sync-config is not supported for '%s'",
object_get_typename(OBJECT(dev)));
return -ENOTSUP;
}
return dc->sync_config(dev, errp);
}
void qmp_device_sync_config(const char *id, Error **errp)
{
DeviceState *dev;
/*
* During migration there is a race between syncing`configuration
* and migrating it (if migrate first, that target would get
* outdated version), so let's just not allow it.
*/
if (migration_is_running()) {
error_setg(errp, "Config synchronization is not allowed "
"during migration");
return;
}
dev = find_device_state(id, true, errp);
if (!dev) {
return;
}
qdev_sync_config(dev, errp);
}
void hmp_device_add(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;