Re: Intel Xe SR-IOV support status

[Marcello Sylvester Bauer <marcello.bauer@9elements.com>]

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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/
> 


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