linux-kernel - Re: [PATCH v1 1/5] iommu/arm-smmu-v3: Move cdtable to arm_smmu

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Message-ID: <ZFwJfVOKWsFk8oup@nvidia.com>
Date:   Wed, 10 May 2023 18:15:41 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, jean-philippe@...aro.org,
        nicolinc@...dia.com, baolu.lu@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/5] iommu/arm-smmu-v3: Move cdtable to arm_smmu_master

On Thu, May 11, 2023 at 04:50:48AM +0800, Michael Shavit wrote:
> In the arm-smmu-v3 driver, stage 1 domains represent the entire STE.
> Iommu domains are conceptually closer to a single address space (with
> some exceptions), which are better represented by a single
> ContextDescriptor for stage 1 domains. With this change, the CD table is
> now owned by the arm_smmu_master instead of the attached domain. Each
> stage 1 domain now represents a single context.

As per my remark on the cover letter this seems a bit confusing
description, but the idea that the CD Table for kernel owned PASID
list is placed in the 'struct arm_smmu_master' does make sense to me

This patch seems very big, is there any way to break it into smaller
steps?
 
Jason