After FFU from 16.2 to 17.1, instances cannot start due to "NotImplementedError: Cannot load 'pcpuset' in the base class" error

Issue

After FFU from 16.2 to 17.1, some instances cannot start with NotImplementedError: Cannot load 'pcpuset' in the base class error.
There is _get_cpu_numa_config_from_instance function in the traceback.

Note: If there is not _get_cpu_numa_config_from_instance function but there is _numa_fit_instance_cell function, please refer to After FFU from 16.2 to 17.1, migration and unshelving are failing with "NotImplementedError: Cannot load 'pcpuset' in the base class" instead.

[req-aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa - default default] Exception during message handling: NotImplementedError: Cannot load 'pcpuset' in the base class
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
    res = self.dispatcher.dispatch(message)
  File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/dispatcher.py", line 309, in dispatch 
    return self._do_dispatch(endpoint, method, ctxt, args)
  File "/usr/lib/python3.9/site-packages/oslo_messaging/rpc/dispatcher.py", line 229, in _do_dispatch
    result = func(ctxt, **new_args) 
  File "/usr/lib/python3.9/site-packages/nova/exception_wrapper.py", line 71, in wrapped
    _emit_versioned_exception_notification(
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "/usr/lib/python3.9/site-packages/nova/exception_wrapper.py", line 63, in wrapped
    return f(self, context, *args, **kw)
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 185, in decorated_function
    LOG.warning("Failed to revert task state for instance. "
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 156, in decorated_function
    return function(self, context, *args, **kwargs) 
  File "/usr/lib/python3.9/site-packages/nova/compute/utils.py", line 1448, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 213, in decorated_function 
    compute_utils.add_instance_fault_from_exc(context,
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 202, in decorated_function 
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3861, in reboot_instance
    do_reboot_instance(context, instance, block_device_info, reboot_type)
  File "/usr/lib/python3.9/site-packages/oslo_concurrency/lockutils.py", line 360, in inner
    return f(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3859, in do_reboot_instance
    self._reboot_instance(context, instance, block_device_info,
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3953, in _reboot_instance
    self._set_instance_obj_error_state(instance)
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
    self.force_reraise()
  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
    raise self.value
  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3923, in _reboot_instance
    self.driver.reboot(context, instance,
  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 3770, in reboot
    return self._hard_reboot(context, instance, network_info,
  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 3860, in _hard_reboot
    xml = self._get_guest_xml(context, instance, network_info, disk_info,
  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 7182, in _get_guest_xml
    conf = self._get_guest_config(instance, network_info, image_meta,
  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 6737, in _get_guest_config
    guest_numa_config = self._get_guest_numa_config(
  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 5776, in _get_guest_numa_config
    guest_cpu_numa_config = self._get_cpu_numa_config_from_instance(
  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 5610, in _get_cpu_numa_config_from_instance
    guest_cell.cpus = instance_cell.total_cpus
  File "/usr/lib/python3.9/site-packages/nova/objects/instance_numa.py", line 101, in total_cpus
    return self.cpuset | self.pcpuset
  File "/usr/lib/python3.9/site-packages/oslo_versionedobjects/base.py", line 67, in getter
    self.obj_load_attr(name)
  File "/usr/lib/python3.9/site-packages/oslo_versionedobjects/base.py", line 600, in obj_load_attr
    raise NotImplementedError(
NotImplementedError: Cannot load 'pcpuset' in the base class