[Bug 1951440] Re: Enable CONFIG_INTEL_IOMMU_DEFAULT_ON and CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON

This bug is awaiting verification that the linux-gcp/6.8.0-1008.9 kernel
in -proposed solves the problem. Please test the kernel and update this
bug with the results. If the problem is solved, change the tag
'verification-needed-noble-linux-gcp' to 'verification-done-noble-linux-
gcp'. If the problem still exists, change the tag 'verification-needed-
noble-linux-gcp' to 'verification-failed-noble-linux-gcp'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-gcp-v2 verification-needed-noble-linux-gcp

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https://bugs.launchpad.net/bugs/1951440

Title:
Enable CONFIG_INTEL_IOMMU_DEFAULT_ON and
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON

Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
Invalid
Status in linux source package in Noble:
Fix Released

Bug description:
Starting with the following commit, upstream kernel is enabling Intel
IOMMU related options by default:

 792fb43ce2c9 ("iommu/vt-d: Enable Intel IOMMU scalable mode by
default")

We should follow upstream direction enabling
CONFIG_INTEL_IOMMU_DEFAULT_ON and
CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON.

A downside is that this change may introduce boot regressions on old
systems (especially those with buggy firmware).

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