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

[Łukasz Zemczak]

Public bug reported:

[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
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.

** Affects: livecd-rootfs (Ubuntu)
     Importance: High
     Assignee: Łukasz Zemczak (sil2100)
         Status: In Progress

** Affects: livecd-rootfs (Ubuntu Jammy)
     Importance: High
     Assignee: Łukasz Zemczak (sil2100)
         Status: In Progress

** Also affects: livecd-rootfs (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Jammy)
       Status: New => In Progress

** Changed in: livecd-rootfs (Ubuntu Jammy)
   Importance: Undecided => High

** Changed in: livecd-rootfs (Ubuntu Jammy)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: livecd-rootfs (Ubuntu Jammy)
    Milestone: None => ubuntu-22.04.4

** Merge proposal linked:
   https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/459185

** Merge proposal linked:
   https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/459181

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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:
  In Progress
Status in livecd-rootfs source package in Jammy:
  In Progress

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 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
  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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