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[Huachang <1848308@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

According to the content defined in doc
https://docs.openstack.org/nova/latest/admin/cpu-topologies.html
#customizing-instance-cpu-pinning-policies, the instance CPU allocation
policy could be explicitly set through instance flavor property
'hw:cpu_policy', or its corresponding image property 'hw_cpu_policy'.

One general rule to solve the conflict between these two properties, if I understand it correctly, is if 'hw:cpu_policy' is not given with any policy, then it should take the policy from 'hw_cpu_policy'. But currently, if 'hw_cpu_policy' is set as 'shared' and no value set in 'hw:cpu_policy' the logic in 'hardware.get_cpu_policy_constraint' tells that there is no CPU policy (throug return a value of None).
In this case, it should return the "shared" policy.

This issue is first reported in https://review.opendev.org/#/c/688603/
but without tracking with a bug ID.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1848308

Title:
  Impossible to set instance CPU policy to 'shared' through flavor image
  property

Status in OpenStack Compute (nova):
  New

Bug description:
  According to the content defined in doc
  https://docs.openstack.org/nova/latest/admin/cpu-topologies.html
  #customizing-instance-cpu-pinning-policies, the instance CPU
  allocation policy could be explicitly set through instance flavor
  property 'hw:cpu_policy', or its corresponding image property
  'hw_cpu_policy'.

  One general rule to solve the conflict between these two properties, if I understand it correctly, is if 'hw:cpu_policy' is not given with any policy, then it should take the policy from 'hw_cpu_policy'. But currently, if 'hw_cpu_policy' is set as 'shared' and no value set in 'hw:cpu_policy' the logic in 'hardware.get_cpu_policy_constraint' tells that there is no CPU policy (throug return a value of None).
  In this case, it should return the "shared" policy.

  This issue is first reported in https://review.opendev.org/#/c/688603/
  but without tracking with a bug ID.

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