QEMU Virtio GPU features status & roadmap?

QEMU Virtio GPU features status & roadmap?

[Hans de Ruiter]

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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?

Also, what's the state of Venus/Vulkan support? Surveying various 
forks/branches, it looks very experimental and subject to change.

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.

regards,
Hans


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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

Re: QEMU Virtio GPU features status & roadmap?

[Marc-André Lureau]

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/

>
> 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

Re: QEMU Virtio GPU features status & roadmap?

[Antonio Caggiano]

Hi Marc-André,

On 08/11/2023 12:07, 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/
> 

Yes, I forgot about that!

>>
>> 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?
> 

I do not need to add anything. Huang, I believe you'll need to rebase as 
some commits in the series have been merged :)

> 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
> 

Cheers,
Antonio

Re: QEMU Virtio GPU features status & roadmap?

[Huang Rui]

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

Re: QEMU Virtio GPU features status & roadmap?

[Hans de Ruiter]

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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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Re: QEMU Virtio GPU features status & roadmap?

[Alex Bennée]

Hans de Ruiter <hans@keasigmadelta.com> writes:

(Cc: Adding others with interest in VirtIO GPUs to the thread)

> 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?
>
> Also, what's the state of Venus/Vulkan support? Surveying various
> forks/branches, it looks very experimental and subject to change.
>
> 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.
>
> regards,
> Hans
>
> [2. application/pgp-keys; publickey - hans@keasigmadelta.com - 4293c311.asc]...

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro