Ubuntu 22.04 and 22.04 kernel patches question

[Stefan Bader]

On 30/06/2026 21:35, Colton Lewis via kernel-team wrote:
> Hello,
> 
> I work on the KVM team within Google Cloud and want to ensure our Ubuntu
> guest images support something my team is working on.
> 
> To do that I need the following four patches:
> 
> 3944382fa6f2 ("arm64: Treat HCR_EL2.E2H as RES1 when 
> ID_AA64MMFR4_EL1.E2H0 is negative")
> b3320142f3db ("arm64: Fix early handling of FEAT_E2H0 not being 
> implemented")
> 7a68b55ff39b ("KVM: arm64: Initialize HCR_EL2.E2H early")
> ca88ecdce5f5 ("arm64: Revamp HCR_EL2.E2H RES1 detection")
> 
> The latest was upstreamed in 6.14 and are all present in the 6.12.y
> stable kernel, with the latter two being backported as cdd6fb56e93f and
> b71781f41cff.
> 
> If I understand these links correctly
> https://ubuntu.com/security/livepatch/docs/livepatch/reference/kernels
> https://documentation.ubuntu.com/kernel/reference/hwe-kernels/
> 
> 24.04 will have a supported 7.0 HWE kernel by August but 22.04 will stay
> at 6.8 as the last HWE.

24.04 has options to use the 6.8 kernel initially released with that LTS 
or a rolling HWE kernel (hwe-7.0 being the last stop for 24.04). Right 
now the HWE kernel for 24.04 is at 6.17 and the roll planned for the 
next updates.

22.04 similarly has 5.15 or hwe-6.8 options.

> 
> I have the following questions:
> 
> 1. Is my understanding correct?

Partially yes. :) See above.

> 2. If I wanted those patches in the 6.8 kernel, would this team pick
> them up automatically from a backport to the 6.6.y stable branch or do I
> need to make a request somewhere?

All kernels follow one or multiple upstream stable streams. So as long 
as patches land as upstream stable nearby the supported kernel versions 
those will eventually get picked up and there is no need for a separate 
submission. Only for those cases where upstream stable does not backport 
to an upstream stable branch that is followed it would be necessary to 
open a Launchpad bug and submit backports individually.

-Stefan
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