linux-kernel - Re: [PATCH v2 5/8] iommu/arm-smmu-v3: Skip cd sync if CD table isn't active

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Message-ID: <ZMkTGJFWrIO4q4Ej@nvidia.com>
Date:   Tue, 1 Aug 2023 11:13:44 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
Cc:     iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, will@...nel.org,
        robin.murphy@....com, nicolinc@...dia.com, jean-philippe@...aro.org
Subject: Re: [PATCH v2 5/8] iommu/arm-smmu-v3: Skip cd sync if CD table isn't
 active

On Mon, Jul 31, 2023 at 06:48:15PM +0800, Michael Shavit wrote:
> This commit explicitly keeps track of whether a CD table is installed in
> an STE so that arm_smmu_sync_cd can skip the sync when unnecessary. This
> was previously achieved through the domain->devices list, but we are
> moving to a model where arm_smmu_sync_cd directly operates on a master
> and the master's CD table instead of a domain.
> 
> Signed-off-by: Michael Shavit <mshavit@...gle.com>
> ---
> 
> Changes in v2:
> - Store field as a bit instead of a bool. Fix comment about STE being
>   live before the sync in write_ctx_desc().

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason