[Bug 1819509] Re: qemu-kvm is not installed with nova-compute

[Corey Bryant]

I believe we've decided that the newton package is behaving as expected
in newton. The alternative dependencies will be read left to right and
if there's a match it will be used (in this case qemu-system); if
there's no match the first alternative (qemu-kvm) will be installed.

I think you can get away with installing qemu-kvm and then nova-compute-
kvm will use that as the dependency. Note that qemu-kvm depends on qemu-
system-x86 (among other architectures but looks like this case is x86)
so I don't think any package purges are required.

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https://bugs.launchpad.net/bugs/1819509

Title:
  qemu-kvm is not installed with nova-compute

Status in nova package in Ubuntu:
  New

Bug description:
  After upgrading compute nodes from mitaka to newton we are not able to migrate virtual machine.
  We are not able to migrate VMs from recently onboarded compute nodes to old compute nodes that has been upgraded to newton.
  Reason is:
  Xenial-mitaka nova-compute (2.13) depends on nova-compute-kvm which does not depend on qemu-kvm:
  Package: nova-compute-kvm
  Architecture: all
  Depends: nova-compute-libvirt (= ${binary:Version}),
           qemu-system (>= 1.3.0) | kvm,
           ${misc:Depends},

  
  Newton nova-compute (2.14) package depends on nova-compute-kvm which depends on qemu-kvm or qemu-system:

  Package: nova-compute-kvm
  Architecture: all
  Depends: nova-compute-libvirt (= ${binary:Version}),
           qemu-kvm | qemu-system (>= 1.3.0) | kvm,
           ${misc:Depends},

  
  When we install newton nova-compute from scratch on compute node  we have qmu-kvm package installed => all virtual machines created on this compute node are using kvm-spice emulator

  When we upgrade nova-compute package from Mitaka to Newton, we don't
  have qemu-kvm package installed  => all virtual machines created on
  this compute node are using qemu-system-x86_64 emulator.

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