Re: Intel Xe SR-IOV support status

[Marcello Sylvester Bauer]

Hi Michal,

On 01.07.25 16:52, Michal Wajdeczko wrote:
> Hi Marcello,
>
> On 30.06.2025 13:47, Marcello Sylvester Bauer wrote:
> > Hi,
> >
> > Starting with Tiger Lake, support for GVT-g was discontinued in favor of
> > SR-IOV for graphics virtualization[1]. Currently, the upstream Xe
> > drivers only support SR-IOV on Panther Lake. The table below summarizes
> > the current state based on the .has_sriov flag.
> >
> > | Intel Gen | drm-xe-next[2] | xe-for-CI[2] | intel lts i915[3] |
> > | --------- | -------------- | ------------ | ----------------- |
> > | TGL       |             no | no           | v5.15             |
> > | ADL/RPL   |             no | yes (debug)  | v5.15             |
> > | MTL       |             no | no           | v6.1              |
> > | ARL       |             no | no           | no                |
> > | PTL       |        v6.13.1 | yes          | no                |
>
> Note that we also have
>
>    | ATSM      |             no | yes (debug)  |

Ah, right. I should have clarified that the list only includes platforms 
with integrated GPUs.

> > Interestingly, the xe/topic/xe-for-CI testing branch only covers SR-IOV
> > testing on the ADL platform and not the MTL or ARL platforms.
> >
> > Is there a reason why SR-IOV has not yet been enabled on the other
> > platforms?
>
> Since platforms before LNL are not officially supported by the Xe
> driver, we have only enabled SR-IOV on those SDV platforms which are
> actively used and tested by our public CI.

That's unfortunate but understandable.
I suppose this means there won't be official support for SR-IOV on 
platforms using either the i915 or Xe driver.

> > Are there any plans or timeline for adding support for them?
>
> AFAIK it’s unlikely. While in case of TGL the enabling is just a
> one-liner patch with new .has_sriov flag, however for robust MTL it
> would require much more SR-IOV specific code to be added, but there is
> no point to add anything until those platforms itself will be fully
> tested in the native mode (non-virtualized).

Thanks for clarifying! I'm particularly interested in the status of MTL 
and ARL because they are the most recent generations on the market.
We are already experimenting with SR-IOV on these platforms to see how 
stable they are performing.

Marcello

> Michal
>
> > Kind regards,
> > Marcello
> > ---
> > [1] https://www.intel.com/content/www/us/en/support/articles/000058558/
> > graphics.html
> > [2] https://gitlab.freedesktop.org/drm/xe
> > [3] https://github.com/intel/linux-intel-lts
> > [4] https://patchwork.freedesktop.org/patch/603316/

Attachment: OpenPGP_0xE54B6622A5EDBF61.asc
Description: OpenPGP public key

Attachment: OpenPGP_signature.asc
Description: OpenPGP digital signature