ACK: [SRU][J][PATCH 0/1] disable Intel DMA remapping by default

[Kai-Heng Feng]

Maybe use INTEL_IOMMU_BROKEN_GFX_WA instead? The option can let GFX
devices identity mapped while keep IOMMU on for other devices.

Kai-Heng

On Fri, May 6, 2022 at 2:04 AM Zachary Tahenakos
<zachary.tahenakos at canonical.com> wrote:
>
> Acked-by: Zachary Tahenakos <zachary.tahenakos at canonical.com>
>
> On 5/5/22 8:34 AM, Andrea Righi wrote:
> > BugLink: https://bugs.launchpad.net/bugs/1971699
> >
> > [Impact]
> >
> > It seems that enabling Intel IOMMU can cause some weird gfx problems,
> > see for example:
> >
> >   https://bugs.launchpad.net/bugs/1971146
> >   https://bugs.launchpad.net/bugs/1965882
> >
> > [Test case]
> >
> > We don't have any specific test case, only other bug reports that
> > tracked down the origin of the issue as being introduced when
> > CONFIG_INTEL_IOMMU_DEFAULT_ON has been enabled by default.
> >
> > [Fix]
> >
> > Revert "UBUNTU: [Config] enable Intel DMA remapping options by default"
> >
> > [Regression potential]
> >
> > DMA remapping device not present at boot by default, users that require
> > this feature will need to specifically add intel_iommu=on to the kernel
> > boot parameters to enable it.
> >
> >
>
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