Re: [PATCH 3/6] vduse: Add API v2 definition

[Jason Wang]

On Wed, Jan 28, 2026 at 8:45 PM Eugenio Pérez <eperezma@xxxxxxxxxx> wrote:
>
> Introduce the definition for VDUSE API V2.  This version serves as a
> gateway for feature negotiation.
>
> The kernel uses this version to determine if the userspace device
> supports feature flags. Devices that do not explicitly negotiate API V2
> will be blocked from querying available VDUSE features, ensuring
> backward compatibility.
>
> The next patches implement the new feature incrementally, only enabling
> the VDUSE device to set the V2 API version by the end of the series.
>
> Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
> ---
>  include/uapi/linux/vduse.h | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h
> index 68b4287f9fac..dea89ed281a7 100644
> --- a/include/uapi/linux/vduse.h
> +++ b/include/uapi/linux/vduse.h
> @@ -14,6 +14,10 @@
>
>  #define VDUSE_API_VERSION_1    1
>
> +/* Features support */
> +
> +#define VDUSE_API_VERSION_2    2

If we can catch the next release cycle, I would perfer not bumping
VDUSE version twice in the same release.

> +
>  /*
>   * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
>   * This is used for future extension.
> --
> 2.52.0
>

Thanks