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

[Linus Torvalds]

On Sat, Aug 6, 2022 at 12:39 PM Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> 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