Public bug reported:
[ Impact ]
* The previous change made the ENA driver built-in to the kernel
in order to mitigate a cloud-init early boot race condition on
AWS instances (LP #2144694).
* This change introduced a regression for users who ship custom or
upstream AWS ENA drivers via DKMS, as the built-in driver cannot
be overridden by out-of-tree modules.
* This SRU reverts ENA from built-in back to a loadable kernel
module, restoring the expected module override behavior.
[ Test Plan ]
* 1. Launch an AWS instance using a kernel with this revert applied.
* 2. Verify ENA is built as a loadable module:
"grep CONFIG_ENA /boot/config-$(uname -r)"
Expected result: "CONFIG_ENA_ETHERNET=m".
[ Where problems could occur ]
* Reverting ENA to a module may reintroduce or increase exposure to
a known timing issue where cloud-init local runs before NIC
initialization completes. This can affect datasource detection timing
on some AWS instance types (e.g. notably hpc7a.*), potentially delaying
metadata availability during first boot (LP #2144694).
[ Other Info ]
* This change is the result of a regression introduced by LP #2144694.
https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/2144694
** Affects: linux-aws (Ubuntu)
Importance: High
Assignee: Leah Goldberg (goldberl)
Status: New
** Affects: linux-aws (Ubuntu Noble)
Importance: High
Assignee: Leah Goldberg (goldberl)
Status: New
** Affects: linux-aws (Ubuntu Questing)
Importance: High
Assignee: Leah Goldberg (goldberl)
Status: New
** Affects: linux-aws (Ubuntu Resolute)
Importance: High
Assignee: Leah Goldberg (goldberl)
Status: New
** Changed in: linux-aws (Ubuntu)
Assignee: (unassigned) => Leah Goldberg (goldberl)
** Also affects: linux-aws (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux-aws (Ubuntu Noble)
Assignee: (unassigned) => Leah Goldberg (goldberl)
** Changed in: linux-aws (Ubuntu Questing)
Assignee: (unassigned) => Leah Goldberg (goldberl)
** Changed in: linux-aws (Ubuntu Resolute)
Assignee: (unassigned) => Leah Goldberg (goldberl)
** Changed in: linux-aws (Ubuntu)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu Noble)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu Questing)
Importance: Undecided => High
** Changed in: linux-aws (Ubuntu Resolute)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/2156924
Title:
ENA built-in config prevents DKMS ENA driver override
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