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[Yan Songming <neutron@xxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1550277

Title:
  ComputeNode pci pools can't change from not empty to empty.

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  
  1 Node pci_passthrough_whitelist is set to pci device，ComputeNode pci pools can get pools。
  2 change pci_passthrough_whitelist empty，ComputeNode pci pools can‘t change
  because：

     def _convert_pci_stats_to_db_format(updates):
          pools = updates.pop('pci_device_pools', None)
          if pools:
              updates['pci_stats'] = jsonutils.dumps(pools.obj_to_primitive())

  if pools is empty，pci_stats will be do nothing.
  That means db will be the old one.

  we should be like this:
          if pools:
              updates['pci_stats'] = jsonutils.dumps(pools.obj_to_primitive())
          else
               xxxxxxxxx

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