[Bug 2050209] Re: Add support for ubuntu-server live largemem SUBARCH images (64k kernel variant)

[Steve Langasek]

** Description changed:

  [Impact]
  
  Since a while, our linux kernel packages also build a 64k page-size
  kernel variant alongside the regular generic 4k ones for arm64. We had
  requests coming from various places on making it easier for people to
  get an ubuntu-server installation with this kernel variant. After many
  discussions, it has been decided that for now - for noble and jammy - we
  would ideally want a new image with this kernel as default. The naming
  has been decided to be 'largemem', for environments with large memory
  requirements.
  
  [Test Case]
  
- Once package accepted into proposed, build an arm64+largemem ubuntu-
- server daily-live image and make sure the image builds fine (and gets
- published on cdimage). Download the image and confirm that the kernel
- shipped (and offered) are the 64k variants (generic, hwe - if
+ Once package accepted into proposed, build both an arm64+largemem
+ ubuntu-server daily-live image and an arm64 (no largemem) ubuntu-server
+ image and make sure the images build fine (and gets published on
+ cdimage). Download the image and confirm that the kernel shipped (and
+ offered) in the largemem image are the 64k variants (generic, hwe - if
  available).
  
  [Regression Potential]
  
  Not much regression potential, but these changes could break other image
  builds, resulting with build failures. Also, rather impossible, but the
  changes could also affect the kernels shipped with other server images.

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https://bugs.launchpad.net/bugs/2050209

Title:
  Add support for ubuntu-server live largemem SUBARCH images (64k kernel
  variant)

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Jammy:
  In Progress
Status in livecd-rootfs source package in Mantic:
  Won't Fix

Bug description:
  [Impact]

  Since a while, our linux kernel packages also build a 64k page-size
  kernel variant alongside the regular generic 4k ones for arm64. We had
  requests coming from various places on making it easier for people to
  get an ubuntu-server installation with this kernel variant. After many
  discussions, it has been decided that for now - for noble and jammy -
  we would ideally want a new image with this kernel as default. The
  naming has been decided to be 'largemem', for environments with large
  memory requirements.

  [Test Case]

  Once package accepted into proposed, build both an arm64+largemem
  ubuntu-server daily-live image and an arm64 (no largemem) ubuntu-
  server image and make sure the images build fine (and gets published
  on cdimage). Download the image and confirm that the kernel shipped
  (and offered) in the largemem image are the 64k variants (generic, hwe
  - if available).

  [Regression Potential]

  Not much regression potential, but these changes could break other
  image builds, resulting with build failures. Also, rather impossible,
  but the changes could also affect the kernels shipped with other
  server images.

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