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[Sean Dague <sean@xxxxxxxxx>]

Could be a feature for the safety check here

** Changed in: nova
       Status: Incomplete => Opinion

** Changed in: nova
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1412994

Title:
  cirros image fails to boot when libvirt.cpu_mode=custom and
  libvirt.cpu_model=pentium

Status in OpenStack Compute (Nova):
  Opinion

Bug description:
  I try to set the libvirt.cpu_mode=custom and
  libvirt.cpu_model=pentium, and then boot a vm using cirros image. The
  'nova boot' command create the instance successfully while the
  instance failed to boot because the image requires x86_64 while
  pentium has no x86_64 support.

  Then I try to  set the image's architecture property to be x86_64,
  with "glance image-update IMG-UUID --property architecture=x86_64".
  After this, the instance is created successfully by 'nova boot' but
  instance still fails to boot.

  I think the reason is because, when libvirt_cpu_model=perntium, the
  compute node should in fact report it's capability as that of Pertium
  processor, instead of the host processor anymore.

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