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[Sylvain Bauza <sbauza@xxxxxxx>]

This sounds a very interesting usecase for discussion. Obviously more
something we should discuss at a PTG instead of within a Launchpad bug
;)

FWIW, I'll close this bug as Invalid/Wishlist but I still think this
usecase deserves a proper brainstorming session, hence a blueprint once
we see some ideas bubbling up.


** Changed in: nova
       Status: New => Invalid

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

** Tags added: compute

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https://bugs.launchpad.net/bugs/1863728

Title:
  Nova can't create instances for a different arch

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  This is more a wish feature than a bug but considering the use cases
  I'm surprised that it's not supported by nova.

  *Support to create instances for a different architecture than the
  host architecture*

  My use case: Running ARM instances in x86_64 compute nodes.

  This is not possible because nova always assume the host architecture.
  Also, there's different assumptions considering the different architectures.

  Some examples:
  - cpu_mode for AARC64 is passthrough (not good if trying to emulate).
  - Nova always checks the cpu_model against the host so is not possible to define an ARM cpu.
  - architecture image property is not used for defining instance domain
  (...)

  This is mostly for discussion and to see if the community is
  interested in supporting this use case.

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