Re: Any plans to implement more ARM SMMUv3 features?

[Eric Auger]

Hi Alex,

On 10/31/23 13:02, Alex Bennée wrote:
> Hi All,
>
> Since 8.1 we enabled the FEAT_RME CPU feature to allow for Arm CCA
> guests to be run under QEMU's Arm emulation. While this is enough for
> pure software guests eventually we would want to support modelling
> systems with "real" hardware. One part of that is updating the SMMU
> emulation to make it RME aware.
>
> The recently published F.a spec is available on the Arm site:
>
>   https://developer.arm.com/documentation/ihi0070/latest/
>
> As we have a keen interest on tracking (and implementing!) Arm features
> we have coded up the various sub-features as stories under an EPIC for
> each level of SMMU feature on our public JIRA:
>
>   https://linaro.atlassian.net/browse/QEMU-533 (SMMUv3.0)
>   https://linaro.atlassian.net/browse/QEMU-553 (SMMUv3.1)
>   https://linaro.atlassian.net/browse/QEMU-558 (SMMUv3.2)
>   https://linaro.atlassian.net/browse/QEMU-566 (SMMUv3.3)
>   
> I think the state of the cards currently represents what has been
> implemented and what is left to do. As you can see it adds up to a fair
> bit of stuff. As a lot of people have been hacking on the SMMU code over
> the last few years I thought it would be useful to reach out and see who
> else is interested in further enhancing the SMMU emulation support?
>
> If anyone has any patches/branches cooking or is intending to implement
> any particular bits please do let me know and I can update the cards to
> reflect the current state of work. As ever we will do our best to help
> review and smooth the up-streaming process for all Arm related feature
> enhancements.

At the moment I have no plan to work on any of those features besides
following "Nested Translation Support for SMMUv3" works ([PATCH v2
00/17] Add Nested Translation Support for SMMUv3
<https://lore.kernel.org/all/cover.1683688960.git.nicolinc@nvidia.com/#r>).
Adding Nicolin in CC by the way.

However I will take some cycles to review patches when they come.

Thanks

Eric
>
> Thanks,
>