Public bug reported:
[Impact]
To properly support instance types in AWS with > 255 cores we need to
make sure that commit c40aaaac1018ff1382f2d35df5129a6bcea3df6b
("iommu/vt-d: Gracefully handle DMAR units with no supported address
widths") is applied across all our linux-aws kernels.
[Test Case]
Tests performed by AWS.
[Fix]
Apply/backport commit c40aaaac1018ff1382f2d35df5129a6bcea3df6b.
[Regression potential]
The fix is affecting only intel IOMMU and it is an upstream fix, so the
regression potential is minimal.
** Affects: linux-aws (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-aws (Ubuntu Xenial)
Importance: Undecided
Status: New
** Affects: linux-aws (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux-aws (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: linux-aws (Ubuntu Groovy)
Importance: Undecided
Status: New
** Affects: linux-aws (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1913739
Title:
aws: properly support instance types with > 255 cpu cores
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