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[Yibo Cai <yibo.cai@xxxxxxxxxx>]

Same bug as https://bugs.launchpad.net/nova/+bug/1598370

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1604332

Title:
  NoneType dereference in parsing guest device address

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  I tried to run tempest test on AArch64. It failed when creating a test
  bed VM. The error log is attached below.

  Traceback (most recent call last):
  ...... eliminated for clarity ......
  File "/opt/stack/nova/nova/virt/libvirt/config.py", line 896, in parse_dom
  AttributeError: 'NoneType' object has no attribute 'parse_dom'

  Error comes from "nova/virt/libvirt/config.py".
  https://review.openstack.org/gitweb?p=openstack/nova.git;a=blob;f=nova/virt/libvirt/config.py;h=281f42f72926c03a49b82182e8a1287e8cf9a1a7;hb=HEAD

  In following code, the factory method may return None if address type
  is neither 'pci' nor 'drive'. And the caller suffer from NoneType
  dereference. As AArch64 default using 'virtio-mmio' for disk type,
  this bug is triggered.

  1142 class LibvirtConfigGuestDeviceAddress(LibvirtConfigObject):
  1143     def __init__(self, type=None, **kwargs):
  1144         super(LibvirtConfigGuestDeviceAddress, self).__init__(
  1145             root_name='address', **kwargs)
  1146         self.type = type
  1147 
  1148     @staticmethod
  1149     def factory(xmldoc):
  1150         addr_type = xmldoc.get('type')
  1151         if addr_type == 'pci':
  1152             return LibvirtConfigGuestDeviceAddressPCI()
  1153         elif addr_type == 'drive':
  1154             return LibvirtConfigGuestDeviceAddressDrive()
  -----------> return None implicitly here

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