From: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
To: Oleksandr Tyshchenko <olekstysh@gmail.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
Oleksandr Tyshchenko <Oleksandr_Tyshchenko@epam.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: Re: [Xen-devel] [PATCH V2] iommu/arm: Don't allow the same micro-TLB to be shared between domains
Date: Wed, 19 Feb 2020 17:01:58 +0000 [thread overview]
Message-ID: <8736b6mryz.fsf@epam.com> (raw)
In-Reply-To: <1581951935-5279-1-git-send-email-olekstysh@gmail.com>
Hello Oleksandr,
Oleksandr Tyshchenko writes:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>
> 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@epam.com>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
> ---
>
> CC: Julien Grall <julien@xen.org>
> CC: Stefano Stabellini <sstabellini@kernel.org>
> CC: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
> CC: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
>
> 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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next prev parent reply other threads:[~2020-02-19 17:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-17 15:05 [Xen-devel] [PATCH V2] iommu/arm: Don't allow the same micro-TLB to be shared between domains Oleksandr Tyshchenko
2020-02-19 17:01 ` Volodymyr Babchuk [this message]
2020-02-24 22:36 ` Julien Grall
2020-02-24 23:18 ` Yoshihiro Shimoda
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