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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1657733

Title:
  KVM module handling different per Architecture - s390x

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi,
  the Intel KVM module is build as a module, yet OTOH the s390 one is not.
  I asked around and we discussed, quoting the core of the discussion that I'd 
like to be continued here:

  <xnox> cpaelzer, we want kvm to be available. on x86 there are two modules 
depending on ones cpu features (amd vs intel vs whatever). thus cannot be 
compiled in, as either/or are loaded.
  ...
  <xnox> infinity, the problem on s390x was that unlike on x86 nothing would 
autoload the module
  <infinity> xnox: That sounds like a bug to take back to IBM and say "plz fix".
  <xnox> and it was counter intuitive for millenials like me to do $ sudo 
modprobe kvm; to get libvirt+qemu working
  [...]
  <cpaelzer> the place to autoload would be /usr/share/qemu/init/qemu-kvm-init 
that is where the others do it
  <infinity> cpaelzer: Yeah, that's a gross hack because there's no proper 
autoloading.
  <cpaelzer> true
  <infinity> cpaelzer: Since that init job only exists if you install qemu, 
modular everywhere would save a tiny bit of boot time on pure guests.  So maybe 
it's worth evaluating
  [...]
  <infinity> But I'm all for kernel configs being as normalized as possible 
across arches.

  I'm not saying we "should" change anything, but since I wondered about that 
arch difference more people will do so as well.
  So we should consciously evaluate, do we want to:
  1. keep it built-in as it is now
  2. change it to a module and rely on qemu-kvm to load it
  3. change it to a module and let IBM upstream do autoload where it is 
supported

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