Re: [PATCH v6 10/10] docs/system: virtio-gpu: Document host/guest requirements

[Akihiko Odaki]

On 2025/01/27 18:45, Alex Bennée wrote:
> Akihiko Odaki <akihiko.odaki@daynix.com> writes:
>
> > On 2025/01/27 5:11, Dmitry Osipenko wrote:
> > > From: Alex Bennée <alex.bennee@linaro.org>
> > > This attempts to tidy up the VirtIO GPU documentation to make the
> > > list
> > > of requirements clearer. There are still a lot of moving parts and the
> > > distros have some catching up to do before this is all handled
> > > automatically.
> > > Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> > > Cc: Sergio Lopez Pascual <slp@redhat.com>
> > > Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> > > [dmitry.osipenko@collabora.com: Extended and corrected doc]
> <snip>
> > >    virtio-gpu rutabaga
> > >    -------------------
> > >    @@ -133,3 +218,23 @@ Surfaceless is the default if ``wsi`` is not
> > > specified.
> > >    .. _Wayland display passthrough: https://www.youtube.com/watch?v=OZJiHMtIQ2M
> > >    .. _gfxstream-enabled rutabaga: 
> > > https://crosvm.dev/book/appendix/rutabaga_gfx.html
> > >    .. _guest Wayland proxy: https://crosvm.dev/book/devices/wayland.html
> > > +
> > > +.. list-table:: Host Requirements
> > > +  :header-rows: 1
> > > +
> > > +  * - Mode
> > > +    - Kernel
> > > +    - Userspace
> > > +  * - virtio-gpu-gl (rutabaga/gfxstream)
> > > +    - GPU enabled
> > > +    - aemu/rutabaga_gfx_ffi or vhost-user client with support
> >
> > Let's omit the mention of aemu. It is a dependency of rutabaga_gfx_ffi
> > and referring to dependencies of our dependencies will make the
> > documentation too cluttered. Users should also see rutabaga_gfx_ffi
> > needs aemu anyway in its build guide; the reference of aemu here is
> > effectively redundant.
> >
> > I don't see the vhost-user support in Rutabaga. Does it really exist?
>
> vhost-device-gpu supports gfxstream although the 3D acceleration parts
> of that are still WIP:
>
>    https://github.com/rust-vmm/vhost-device/tree/main/staging/vhost-device-gpu

It is nice to know the project.

vhost-user support is implemented with virtio-gpu-gl but it has its own 
device variant so it is not a right place to describe it. vhost-user-gpu 
is not documented at all so if you are going to write its documentation 
it will be a great addition.

> > > +
> > > +.. list-table:: Guest Requirements
> > > +  :header-rows: 1
> > > +
> > > +  * - Mode
> > > +    - Mesa Version
> > > +    - Mesa build flags
> > > +  * - virtio-gpu-gl (rutabaga/gfxstream)
> > > +    - 24.3.0+
> > > +    - -Dvulkan-drivers=gfxstream