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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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1
hw/block/vhost-user-blk.c
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@ -591,6 +591,7 @@ static void vhost_user_blk_class_init(ObjectClass *klass, void *data)
device_class_set_props(dc, vhost_user_blk_properties);
dc->vmsd = &vmstate_vhost_user_blk;
dc->sync_config = vhost_user_blk_sync_config;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
vdc->realize = vhost_user_blk_device_realize;
vdc->unrealize = vhost_user_blk_device_unrealize;