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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>
- From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Date: Wed, 19 Feb 2020 17:01:58 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 19 Feb 2020 17:02:08 +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
Hello Oleksandr,
Oleksandr Tyshchenko writes:
> 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>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> ---
>
> CC: Julien Grall <julien@xxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> CC: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
>
> Changes V1 [1] -> V2:
> - Rename "data" to "imuctr" in ipmmu_utlb_enable()
> - Disable already enabled uTLBs in ipmmu_attach_device()
> in case of error
--
Volodymyr Babchuk at EPAM
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