linux-kernel - Re: [PATCH v2] iommu: Optimise PCI SAC address trick

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Date:   Wed, 21 Sep 2022 09:24:29 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     joro@...tes.org, will@...nel.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iommu: Optimise PCI SAC address trick

On Wed, Sep 21, 2022 at 5:53 AM Robin Murphy <robin.murphy@....com> wrote:
>
> Per the reasoning in commit 4bf7fda4dce2 ("iommu/dma: Add config for
> PCI SAC address trick") and its subsequent revert, this mechanism no
> longer serves its original purpose, but now only works around broken
> hardware/drivers in a way that is unfortunately too impactful to remove.

I was going to test this, since the previous version failed for me.
But it's based on linux-next, and I didn't want to fight the conflicts
(including - but not limited to - the header file being moved) so I
dropped that plan.

If you think it's worth testing on the setup that used to fail, and
you send me a version that applies on my current tree, I can do so.

               Linus