On Mon, Nov 04, 2024 at 04:07:00PM -0500, Michael S. Tsirkin wrote:
> From: Vladimir Sementsov-Ogievskiy <vsement...@yandex-team.ru>
>
> 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 <vsement...@yandex-team.ru>
> Reviewed-by: Markus Armbruster <arm...@redhat.com>
> Acked-by: Raphael Norwitz <raph...@enfabrica.net>
> Message-Id: <20240920094936.450987-4-vsement...@yandex-team.ru>
> Reviewed-by: Michael S. Tsirkin <m...@redhat.com>
> Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> qapi/qdev.json | 24 ++++++++++++++++++++++++
> include/hw/qdev-core.h | 6 ++++++
> hw/block/vhost-user-blk.c | 1 +
> hw/virtio/virtio-pci.c | 9 +++++++++
> system/qdev-monitor.c | 38 ++++++++++++++++++++++++++++++++++++++
> 5 files changed, 78 insertions(+)
>
> diff --git a/qapi/qdev.json b/qapi/qdev.json
> index 53d147c7b4..2a581129c9 100644
> --- a/qapi/qdev.json
> +++ b/qapi/qdev.json
> @@ -163,3 +163,27 @@
> ##
> { 'event': 'DEVICE_UNPLUG_GUEST_ERROR',
> 'data': { '*device': 'str', 'path': 'str' } }
> +
> +##
> +# @device-sync-config:
> +#
> +# Synchronize device configuration from host to guest part. First,
> +# copy the configuration from the host part (backend) to the guest
> +# part (frontend). Then notify guest software that device
> +# configuration changed.
> +#
> +# The command may be used to notify the guest about block device
> +# capcity change. Currently only vhost-user-blk device supports
> +# this.
> +#
> +# @id: the device's ID or QOM path
> +#
> +# Features:
> +#
> +# @unstable: The command is experimental.
> +#
> +# Since: 9.1
> +##
Again, we're in the 9.2 dev cycle currently.
With regards,
Daniel
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