linux-kernel - Re: [PATCH v1] iommu/arm-smmu-v3: Allow default substream bypass with a pasid support

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Message-ID: <ZJxVHf2YZ1LxPx23@nvidia.com>
Date:   Wed, 28 Jun 2023 12:43:25 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Nicolin Chen <nicolinc@...dia.com>, will@...nel.org,
        joro@...tes.org, shameerali.kolothum.thodi@...wei.com,
        yangyicong@...ilicon.com, jean-philippe@...aro.org,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] iommu/arm-smmu-v3: Allow default substream bypass
 with a pasid support

On Wed, Jun 28, 2023 at 04:39:48PM +0100, Robin Murphy wrote:

> > I'd try keeping most of the parts intact while adding a pointer
> > to a structure holding pagetable stuff, to make it cleaner. Then
> > the S1DSS bypass case can be flagged by an empty pointer.
> 
> I'd expect that what you need for this is much the same as what Michael has
> already proposed for the PASID-generalisation series. The current inside-out
> notion of S1 domains owning CD tables is what's getting in the way of doing
> the right thing cleanly, in both cases.

Yeah, that was sort of my guessed feeling as well..

What do you think of Michael's series?

Jason