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Re: [XEN PATCH v6 0/7] FF-A notifications
- To: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Mon, 10 Jun 2024 15:54:18 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "patches@xxxxxxxxxx" <patches@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Mon, 10 Jun 2024 15:54:39 +0000
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- Thread-topic: [XEN PATCH v6 0/7] FF-A notifications
Hi Jens,
> On 10 Jun 2024, at 08:53, Jens Wiklander <jens.wiklander@xxxxxxxxxx> wrote:
>
> Hi,
>
> This patch set adds support for FF-A notifications. We only support
> global notifications, per vCPU notifications remain unsupported.
>
> The first three patches are further cleanup and can be merged before the
> rest if desired.
>
> A physical SGI is used to make Xen aware of pending FF-A notifications. The
> physical SGI is selected by the SPMC in the secure world. Since it must not
> already be used by Xen the SPMC is in practice forced to donate one of the
> secure SGIs, but that's normally not a problem. The SGI handling in Xen is
> updated to support registration of handlers for SGIs that aren't statically
> assigned, that is, SGI IDs above GIC_SGI_MAX.
>
> The patch "xen/arm: add and call init_tee_secondary()" provides a hook for
> register the needed per-cpu interrupt handler in "xen/arm: ffa: support
> notification".
>
> The patch "xen/arm: add and call tee_free_domain_ctx()" provides a hook for
> later freeing of the TEE context. This hook is used in "xen/arm: ffa:
> support notification" and avoids the problem with TEE context being freed
> while we need to access it when handling a Schedule Receiver interrupt. It
> was suggested as an alternative in [1] that the TEE context could be freed
> from complete_domain_destroy().
>
> [1]
> https://lore.kernel.org/all/CAHUa44H4YpoxYT7e6WNH5XJFpitZQjqP9Ng4SmTy4eWhyN+F+w@xxxxxxxxxxxxxx/
>
> Thanks,
> Jens
All patches are now reviewed and/or acked so I think they can get in for the
release.
Regards
Bertrand
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