Re: QEMU Virtio GPU features status & roadmap?

[Antonio Caggiano]

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

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.

> 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.

> regards,
> Hans

Cheers,
Antonio