linux-kernel - Re: [git pull] IOMMU Updates for Linux v5.20

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Message-ID: <CAHk-=wiSxEVW78nTumvz+ZYt2MZcmqe6S0nb_-efKYm636VuGA@mail.gmail.com>
Date:   Sat, 6 Aug 2022 13:31:28 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        John Garry <john.garry@...wei.com>
Cc:     Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev
Subject: Re: [git pull] IOMMU Updates for Linux v5.20

On Sat, Aug 6, 2022 at 12:39 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> If it is, it will be reverted as hopelessly optimistic.

Indeed. I should just have verified with the kernel command line, but
I started bisecting when it wasn't entirely obvious what was going on,
so I just finished it.

Commit 4bf7fda4dce2 ("iommu/dma: Add config for PCI SAC address
trick") is reverted in my tree. You can try again in a decade or so,
but at least on x86-64, that config option is basically a "stop modern
machines from working", and I don't want to have that even as an
option.

If somebody wants some debug output to figure out which device it is
that cares, send me a patch, but we're not trying this thing as-is
again.

                 Linus