Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxxx> writes:
> This option doesn't make sense since long ago (10 years!)
> commit 1e7398a140f7a6 ("vhost: enable vhost without without MSI-X").
>
> Prior 1e7398a140f7a6, to enable vhost for some specific kind of guests
> (that don't have MSI-X support), you should have set vhostforce=on
> (with vhost=on or unset).
>
> Since 1e7398a140f7a6, guest type doesn't matter, all guests are equal
> for vhost-enabling options logic.
>
> The current logic is:
> vhost=on / vhost=off : vhostforce ignored, doesn't make sense
> vhost unset : vhostforce counts, enabling vhost
>
> Currently you may enable vhost several ways:
> - vhost=on
> - vhostforce=on
> - vhost=on + vhostforce=on
> - and even vhost=on + vhostforce=off
>
> - they are all equal.
>
> Let's finally deprecate the extra option.
>
> Also, fix @vhostforce documentation.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxxx>
> ---
>
> v2:
> - improve wording
> - add documentation fix
>
> docs/about/deprecated.rst | 7 +++++++
> qapi/net.json | 11 +++++++++--
> 2 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
> index d50645a071..b17a5a41aa 100644
> --- a/docs/about/deprecated.rst
> +++ b/docs/about/deprecated.rst
> @@ -516,6 +516,13 @@ Stream ``reconnect`` (since 9.2)
> The ``reconnect`` option only allows specifying second granularity timeouts,
> which is not enough for all types of use cases, use ``reconnect-ms`` instead.
>
> +TAP ``vhostforce`` (since 10.2)
> +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> +
> +The ``vhostforce`` option is redundant with the ``vhost`` option.
> +If they conflict, ``vhost`` takes precedence. Just use ``vhost``.
> +
> +
> VFIO device options
> '''''''''''''''''''
>
> diff --git a/qapi/net.json b/qapi/net.json
> index 78bcc9871e..e89c7aff5f 100644
> --- a/qapi/net.json
> +++ b/qapi/net.json
> @@ -346,13 +346,20 @@
> # @vhostfds: file descriptors of multiple already opened vhost net
> # devices
> #
> -# @vhostforce: vhost on for non-MSIX virtio guests
> +# @vhostforce: enable vhost-net network accelerator. Ignored when
> +# @vhost is set.
Two spaces between sentences for consistency, please.
> #
> # @queues: number of queues to be created for multiqueue capable tap
> #
> # @poll-us: maximum number of microseconds that could be spent on busy
> # polling for tap (since 2.7)
> #
> +# Features:
> +#
> +# @deprecated: Member @vhostforce is deprecated. The @vhostforce
> +# option is redundant with the @vhost option. If they conflict,
> +# @vhost takes precedence. Just use @vhost.
> +#
> # Since: 1.2
> ##
> { 'struct': 'NetdevTapOptions',
> @@ -369,7 +376,7 @@
> '*vhost': 'bool',
> '*vhostfd': 'str',
> '*vhostfds': 'str',
> - '*vhostforce': 'bool',
> + '*vhostforce': { 'type': 'bool', 'features': [ 'deprecated' ] },
> '*queues': 'uint32',
> '*poll-us': 'uint32'} }
Reviewed-by: Markus Armbruster <armbru@xxxxxxxxxx>
