Re: [Xen-devel] [PATCH V2] iommu/arm: Don't allow the same micro-TLB to be shared between domains

[Julien Grall <julien@xxxxxxx>]

Hi Oleksandr,

On 17/02/2020 15:05, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
>
> For the IPMMU-VMSA we need to prevent the use cases where devices
> which use the same micro-TLB are assigned to different Xen domains
> (micro-TLB cannot be shared between multiple Xen domains, since it
> points to the context bank to use for the page walk).
>
> As each Xen domain uses individual context bank pointed by context_id,
> we can potentially recognize that use case by comparing current and new
> context_id for the already enabled micro-TLB and prevent different
> context bank from being set.
>
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Acked-by: Julien Grall <julien@xxxxxxx>

It would be good to get a review from Yoshihiro. If I don't see an 
answer by the end of the week, I will commit without it.
Cheers,

--
Julien Grall

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