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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: Confirmed

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https://bugs.launchpad.net/bugs/1532886

Title:
  s390x kernels are inconsistent for cloud stuff

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Confirmed

Bug description:
  So to do virtual machine / cloudy stuff things in the kernel config,
  are not how one would expect them to be. Whilst investigating that
  I've went ahead to compare all our kernel configs.

  amd64/config.common.amd64:CONFIG_VIRTIO_BLK=y
  amd64/config.common.amd64:CONFIG_VIRTIO_NET=y
  arm64/config.common.arm64:CONFIG_VIRTIO_BLK=y
  arm64/config.common.arm64:CONFIG_VIRTIO_NET=y
  armhf/config.common.armhf:CONFIG_VIRTIO_BLK=y
  armhf/config.common.armhf:CONFIG_VIRTIO_NET=y
  i386/config.common.i386:CONFIG_VIRTIO_BLK=y
  i386/config.common.i386:CONFIG_VIRTIO_NET=y
  powerpc/config.common.powerpc:CONFIG_VIRTIO_BLK=y
  powerpc/config.common.powerpc:CONFIG_VIRTIO_NET=y
  ppc64el/config.common.ppc64el:CONFIG_VIRTIO_BLK=y
  ppc64el/config.common.ppc64el:CONFIG_VIRTIO_NET=y

  but...
  s390x/config.common.s390x:CONFIG_VIRTIO_BLK=m
  s390x/config.common.s390x:CONFIG_VIRTIO_NET=m

  
  It would make sense to set CONFIG_VIRTIO_BLK and _NET to "=y" on s390x.

  Also:

  amd64/config.common.amd64:CONFIG_KVM=m
  arm64/config.common.arm64:CONFIG_KVM=y
  armhf/config.common.armhf:CONFIG_KVM=y
  i386/config.common.i386:CONFIG_KVM=m
  powerpc/config.common.powerpc:CONFIG_KVM=y
  ppc64el/config.common.ppc64el:CONFIG_KVM=y
  s390x/config.common.s390x:CONFIG_KVM=m

  Is a bit of mixed bag... x86+s390x have it as a module, yet
  arm*+powerpc* have it built in? Maybe all arches should be =y ?

  another one:
  Is there something special about ZLIB_DEFLATE on s390x?

  amd64/config.common.amd64:CONFIG_ZLIB_DEFLATE=y
  arm64/config.common.arm64:CONFIG_ZLIB_DEFLATE=y
  armhf/config.common.armhf:CONFIG_ZLIB_DEFLATE=y
  i386/config.common.i386:CONFIG_ZLIB_DEFLATE=y
  powerpc/config.common.powerpc:CONFIG_ZLIB_DEFLATE=y
  ppc64el/config.common.ppc64el:CONFIG_ZLIB_DEFLATE=y

  s390x/config.common.s390x:CONFIG_ZLIB_DEFLATE=m

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