APPLIED[N]: [U/N][PATCH 1/1] UBUNTU: [Config] enable Intel DMA remapping by default

[Andrea Righi]

On Wed, Feb 21, 2024 at 09:56:33AM +0100, Andrea Righi wrote:
> BugLink: https://bugs.launchpad.net/bugs/1951440
> 
> We have tried in the past to enable CONFIG_INTEL_IOMMU_DEFAULT_ON and
> CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON (starting with Jammy), but
> there were multiple issues (especially with old hardware), so we ended
> up disabling these options afterwards, see LP: #1971699.
> 
> Considering that IOMMU is enabled by default in upstream kernels,
> probably most of these issues are solved now (or old hardware has been
> decommissioned).
> 
> Moreover, having this enabled by default can prevent potential issues
> with modern hardware and drivers (see for example LP #1958004).
> 
> Signed-off-by: Andrea Righi <andrea.righi at canonical.com>

Applied to noble/linux.

-Andrea