Hey,

We actually had some refactoring of this code in later releases but
it's not there for Wallaby yet.

So - nova_pci_alias is a regular list, you can define any content
inside of it and it will be populated in the template. As we do not
parse the content - just loop over the list:
https://opendev.org/openstack/openstack-ansible-os_nova/src/branch/unmaintained/wallaby/templates/nova.conf.j2#L314-L316

There is also a variable for nova_pci_passthrough_whitelist - which
will also paste content pretty much "as is". However, there's no
`device_spec` in Wallaby - we got it implemented only in Zed:
https://review.opendev.org/q/Id2da29464359b4845c7d05e3bec53759341f4bad

So one thing I usually suggest doing in such cases - using overrides.
There is a variable nova_nova_conf_overrides which can be used to add
arbitrary content to nova.conf (we have such variables for pretty much
every config file).
You can define it as:

nova_nova_conf_overrides:
  pci:
    device_spec: '{ "vendor_id": "10de", "product_id": "25b6" }'

Eventually, you can also just ignore nova_pci_passthrough_whitelist
and nova_pci_alias, and just use overrides for them as well, ie:

nova_nova_conf_overrides:
  pci:
    device_spec: '{ "vendor_id": "10de", "product_id": "25b6" }'
    passthrough_whitelist: '{ "vendor_id": "10de", "product_id": "25b6" }'
    alias: '{ "vendor_id": "10de", "product_id": "25b6",
"device_type": "type-PCI", "name": "nvidia" }'

Just make sure, that you don't have `nova_nova_conf_overrides` defined
elsewhere (like user_variables), as then the variable with higher
precedence will "win". Though, you can do some "combine" from
different group_vars/host_vars or just place full override content to
host_vars...

вт, 21 янв. 2025 г. в 22:47, Rambo Rambo <ram.ramb2412@gmail.com>:
>
> Hi Experts
>
> Release: Wallaby
> Distribution: Openstack-ansible
>
> I am working on enabling GPU computes through PCIpassthrough:
>
> I managed to test the GPU PCI passthrough with the direct configuration below.
>
> GPU compute:
> /etc/nova/nova.conf
>
> [pci]
> device_spec = { "vendor_id": "10de", "product_id": "25b6" }
> passthrough_whitelist = { "vendor_id": "10de", "product_id": "25b6" }
> alias = { "vendor_id": "10de", "product_id": "25b6", "device_type": "type-PCI", "name": "nvidia" }
>
>
> Nova API container:
> /etc/nova/nova.conf
>
> enabled_filters = AvailabilityZoneFilter,ComputeFilter,AggregateNumInstancesFilter,AggregateIoOpsFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,NUMATopologyFilter,PciPassthroughFilter
>
> [pci]
> alias = { "vendor_id": "10de", "product_id": "25b6", "device_type": "type-PF", "name": "nvidia" }
>
> Now I need to put the configuration through openstack-ansible. So I need support for the same.
>
> compute:
>
> I intend to use hostvar for the compute configuration:
>
> /etc/openstack_deploy/host_vars/compute-<>.yml
>
> Can someone please confirm the parameters I need to set in this file and how to implement it?
>
> device_spec = ?
> passthrough_whitelist = ?
> nova_pci_alias:
>     - '{ "name": "nvidia", "product_id": "25b6", "vendor_id": "10de" }'           =====> how can I add device_type field here as per the mail.yaml it only have  name,product_id and vendor_id field?
>
> Run
> openstack-ansible os-nova-install.yml --tags nova-config --limit <compute name>
>
> For nova_api configuration, I intend to use below:
>
> Below parameter in the user_variable file
>
> nova_scheduler_default_filters:
>   - AvailabilityZoneFilter
>   - ComputeFilter
>   - AggregateInstanceExtraSpecsFilter
>   - AggregateNumInstancesFilter
>   - AggregateIoOpsFilter
>   - ComputeCapabilitiesFilter
>   - ImagePropertiesFilter
>   - ServerGroupAntiAffinityFilter
>   - ServerGroupAffinityFilter
>   - NUMATopologyFilter
>   - PciPassthroughFilter
>
> nova_pci_alias:
>     - '{ "name": "nvidia", "product_id": "25b6", "vendor_id": "10de" }'           =====> how can I add device_type field here as per the mail.yaml it only have  name,product_id and vendor_id field?
>
> Execute:
> openstack-ansible os-nova-install.yml --tags nova-config --limit <nova api containers>
>
> Regards