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Re: [Xen-devel] [PATCH V2] iommu/arm: Don't allow the same micro-TLB to be shared between domains
- To: Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
- Date: Mon, 24 Feb 2020 23:18:40 +0000
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- Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
- Delivery-date: Mon, 24 Feb 2020 23:19:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH V2] iommu/arm: Don't allow the same micro-TLB to be shared between domains
Hi Oleksandr-san,
> From: Oleksandr Tyshchenko, Sent: Tuesday, February 18, 2020 12:06 AM
>
> 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>
>
> ---
>
> CC: Julien Grall <julien@xxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> CC: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Thank you for the patch!
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Best regards,
Yoshihiro Shimoda
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