Public bug reported:

SRU Justification

[Impact]

Google requested that the virtio_balloon module be made loadable, rather
than built-in. This is to support disabling the module at runtime, which
is specified as possible in their documentation:
https://cloud.google.com/compute/docs/dynamic-resource-
management#disabling_the_virtio_memory_balloon_device

[Fix]

Change CONFIG_VIRTIO_BALLOON to build the driver as a loadable module
rather than a built-in, drivers/virtio/* is already in the inclusion
list, so the driver will be included in the main modules package.

[Test Plan]

List files in the linux-modules package and verify that
virtio_balloon.ko is there.

[Regression potential]

The regression potential is very low since the module will still be
included with all cloud installations and a user has to manually disable
it to get different behavior.

** Affects: linux-gcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2105142

Title:
  GCP kernels need CONFIG_VIRTIO_BALLOON=m (not =y)

Status in linux-gcp package in Ubuntu:
  New

Bug description:
  SRU Justification

  [Impact]

  Google requested that the virtio_balloon module be made loadable,
  rather than built-in. This is to support disabling the module at
  runtime, which is specified as possible in their documentation:
  https://cloud.google.com/compute/docs/dynamic-resource-
  management#disabling_the_virtio_memory_balloon_device

  [Fix]

  Change CONFIG_VIRTIO_BALLOON to build the driver as a loadable module
  rather than a built-in, drivers/virtio/* is already in the inclusion
  list, so the driver will be included in the main modules package.

  [Test Plan]

  List files in the linux-modules package and verify that
  virtio_balloon.ko is there.

  [Regression potential]

  The regression potential is very low since the module will still be
  included with all cloud installations and a user has to manually
  disable it to get different behavior.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-gcp/+bug/2105142/+subscriptions


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