Re: QEMU Virtio GPU features status & roadmap?

[Hans de Ruiter]

Hi everyone,

Thanks for the info. It's great to hear that things are progressing. In 
the meantime, I've started working with Virtio GPU in its current state 
on QEMU's master branch. I think I've managed to find a workaround for 
the direct VRAM access.

BTW, is there any official documentation for VirGL, Venus, etc.? Or is 
that yet to be written?

regards,
Hans


On 9/11/23 16:13, Huang Rui wrote:
> On Wed, Nov 08, 2023 at 07:07:43PM +0800, Marc-André Lureau wrote:
> > Hi
> >
> > On Wed, Nov 8, 2023 at 1:04 PM Antonio Caggiano
> > <quic_acaggian@quicinc.com> wrote:
> > > Hi Hans,
> > >
> > > +cc Gert and Dmitry
> > >
> > > On 17/10/2023 02:48, Hans de Ruiter wrote:
> > > > Hi,
> > > >
> > > > I'm working on Virtio GPU drivers for AmigaOS, and would like to know
> > > > what features are currently stable enough to use. Looking at the master
> > > > QEMU branch, both Virgl and blob resources are supported, but NOT at the
> > > > same time. Is the ability to use both simultaneously coming soon?
> > > Mmh, well, they should be compatible, I'll try sending a patch.
> > >
> > > > Also, what's the state of Venus/Vulkan support? Surveying various
> > > > forks/branches, it looks very experimental and subject to change.
> > > I believe this is quite stable now:
> > > https://gitlab.freedesktop.org/virgl/venus-protocol/-/issues/5
> > The last patch series for QEMU is from Huang Rui:
> > https://patchew.org/QEMU/20230915111130.24064-1-ray.huang@amd.com/
> I am working on V6, and will send them out very soon.
>
> Thanks,
> Ray
>
> > > Virglrenderer 1.0.0 has been released as well. I wonder if that requires
> > > any change in QEMU. Gert or Dmitry might know the answer.
> > No changes required afaik.
> >
> > > > I have the added difficulty that the AmigaOS Picasso96 driver API
> > > > expects direct CPU access to all of VRAM, and likes to peek/poke
> > > > directly into the bitmaps. That's clearly not possible without blob
> > > > resources, or shared memory (not entirely sure what the shared memory
> > > > feature is for). This is why I want to know what features are stable or
> > > > coming soon.
> > > The shared memory feature is just a requirement which enables support
> > > for blob resources.
> > Now that we are in freeze, we won't merge new features until the end
> > of this year / next year. But we can already plan / test / review etc.
> >
> > Antonio, do you have your work coordinated with Huang?
> >
> > Huang, are you going to send a new version of the venus series?
> >
> > It would be great to include docs/system/devices/virtio-gpu.rst
> > updates too. It's getting difficult to follow the various ways
> > virtio-gpu can be used nowadays.
> >
> > thanks
> >
> > --
> > Marc-André Lureau

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