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[Lee Yarwood <1921075@xxxxxxxxxxxxxxxxxx>]

** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1921075

Title:
  [arm64][libvirt] fail to load json from firmware metadata files

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Found error in [3] for libvirt with Ubuntu focal on arm64. We fail to
  load JSON from QEMU firmware metadata files with error [1][2]:

  Instance failed to spawn: TypeError: can't concat str to bytes
  Traceback (most recent call last):
    File "/opt/stack/nova/nova/compute/manager.py", line 2620, in _build_resources
      yield resources
    File "/opt/stack/nova/nova/compute/manager.py", line 2389, in _build_and_run_instance
      self.driver.spawn(context, instance, image_meta,
    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 3877, in spawn
      xml = self._get_guest_xml(context, instance, network_info,
    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 6721, in _get_guest_xml
      conf = self._get_guest_config(instance, network_info, image_meta,
    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 6334, in _get_guest_config
      self._configure_guest_by_virt_type(guest, instance, image_meta, flavor)
    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 5943, in _configure_guest_by_virt_type
      loader, nvram_template = self._host.get_loader(
    File "/opt/stack/nova/nova/virt/libvirt/host.py", line 1636, in get_loader
      for loader in self.loaders:
    File "/opt/stack/nova/nova/virt/libvirt/host.py", line 1619, in loaders
      self._loaders = _get_loaders()
    File "/opt/stack/nova/nova/virt/libvirt/host.py", line 112, in _get_loaders
      spec = jsonutils.load(fh)
    File "/usr/local/lib/python3.8/dist-packages/oslo_serialization/jsonutils.py", line 261, in load
      return json.load(codecs.getreader(encoding)(fp), **kwargs)
    File "/usr/lib/python3.8/json/__init__.py", line 293, in load
      return loads(fp.read(),
    File "/usr/lib/python3.8/codecs.py", line 500, in read
      data = self.bytebuffer + newdata
  TypeError: can't concat str to byte


  Enviro
  [1] http://paste.openstack.org/show/803788/
  [2] https://zuul.opendev.org/t/openstack/build/312d8e45b079460496d90f1d940c174c/log/controller/logs/screen-n-cpu.txt#22708
  [3] https://review.opendev.org/c/openstack/devstack/+/708317

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