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For compatibility reasons of some older VMs, I've used the following cpu_mode and cpu_models definition in one of the compute nodes nova.conf:
[libvirt]
inject_partition = -2
inject_password = False
inject_key = False
virt_type = kvm
live_migration_with_native_tls = true
live_migration_scheme = tls
live_migration_inbound_addr = 172.29.236.114
hw_disk_discard = ignore
disk_cachemodes =
cpu_mode = custom
cpu_models = IvyBridge

In terms of flavor definition, I've set the following trait:
openstack image set  --property traits:HW_CPU_X86_AVX512BW=forbidden flavor.test

I know for sure that HW_CPU_X86_AVX512BW is not supported in IvyBridge so my understanding is that this trait definition should suffice to select the specific compute node. In fact I have verified that placement service does NOT return the specific compute when quering for the specific trait (and instead returns all other nodes).
Yet, when scheduling an instance using this flavor, I get the following error.

Traceback (most recent call last): File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/nova/conductor/manager.py", line 1654, in
schedule_and_build_instances host_lists =
self._schedule_instances(context, request_specs[0], File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/nova/conductor/manager.py", line 942, in _schedule_instances
host_lists = self.query_client.select_destinations( File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/nova/scheduler/client/query.py", line 41, in
select_destinations return
self.scheduler_rpcapi.select_destinations(context, spec_obj, File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/nova/scheduler/rpcapi.py", line 160, in select_destinations
return cctxt.call(ctxt, 'select_destinations', **msg_args) File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/oslo_messaging/rpc/client.py", line 190, in call result =
self.transport._send( File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/oslo_messaging/transport.py", line 123, in _send return
self._driver.send(target, ctxt, message, File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/oslo_messaging/_drivers/amqpdriver.py", line 689, in send
return self._send(target, ctxt, message, wait_for_reply, timeout, File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/oslo_messaging/_drivers/amqpdriver.py", line 681, in _send
raise result nova.exception_Remote.NoValidHost_Remote: No valid host was
found. Traceback (most recent call last): File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/oslo_messaging/rpc/server.py", line 244, in inner return
func(*args, **kwargs) File
"/openstack/venvs/nova-28.0.0/lib/python3.10/site-
packages/nova/scheduler/manager.py", line 243, in select_destinations
raise exception.NoValidHost(reason="") nova.exception.NoValidHost: No
valid host was found.

This seems like a bug of the trait selection logic of nova.

openstack ansible version is 2023.2

** Affects: nova
     Importance: Undecided
         Status: New

-- 
forbidden traits in flavor not honored
https://bugs.launchpad.net/bugs/2063364
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