Thank you,

I tried but the result is still the same, it does not find the flavor, even though it appears on CLI...

$ openstack flavor show gpu_flavor
+----------------------------+---------------------------------------+
| Field                      | Value                                 |
+----------------------------+---------------------------------------+
| OS-FLV-DISABLED:disabled   | False                                 |
| OS-FLV-EXT-DATA:ephemeral  | 0                                     |
| access_project_ids         | None                                  |
| description                | None                                  |
| disk                       | 40                                    |
| id                         | b729f843-0a66-4e74-9a74-1dc7b1fb246f  |
| name                       | gpu_flavor                            |
| os-flavor-access:is_public | True                                  |
| properties                 | pci_passthrough:alias='nvidia-t400:1' |
| ram                        | 8192                                  |
| rxtx_factor                | 1.0                                   |
| swap                       | 0                                     |
| vcpus                      | 4                                     |
+----------------------------+---------------------------------------+

-- 
Francesco Di Nucci
System Administrator 
Compute & Networking Service, INFN Naples

Email: francesco.dinucci@na.infn.it

On 28/03/25 10:18, Rambo Rambo wrote:

Hi Francesco

I have added GPU (PCIpassthrough) successfully following: https://www.roksblog.de/enabling-gpu-passthrough-in-openstack-kolla-ansible-for-high-performance-workloads/

compute 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-a2" }

 

 

control nova.conf:

alias = { "name": "nvidia-a2", "product_id": "25b6", "vendor_id": "10de", "device_type": "type-PF" }

May be you can review the config. 

Regards

On Fri, Mar 28, 2025 at 8:59 AM Francesco Di Nucci <francesco.dinucci@na.infn.it> wrote:

Hi all,

I am trying to setup PCI passthrough with Nova, following guides such as this and this:

• installed a GPU on a compute node, configured kernel etc and now it is using the vfio-pci driver
• set [pci]/device_spec = { "vendor_id": "10de", "product_id": "1ff2" } on compute node (formerly [pci]/passthrough_whitelist) and restarted openstack-nova-*
• On the controller node set [pci]/alias: { "vendor_id":"10de", "product_id":"1ff2", "device_type":"type-PCI", "name":"nvidia-t400" }, [filter_scheduler]/enabled_filters = PciPassthroughFilter, [filter_scheduler]/available_filters = nova.scheduler.filters.all_filters and restarted openstack-nova-*
• Created a flavor with openstack flavor create --vcpus 4 --ram 8192 --disk 40 --property "pci_passthrough:alias"="nvidia-t400:1" gpu_flavor, it is shown with openstack flavor list
• Created an image with --property img_hide_hypervisor_id=true
• Tried to create an instance with openstack server create --flavor gpu_flavor --image Almalinux_GPU --key-name "My Key"  --network my_network test-gpu (also with --availability-zone nova:my-gpu-node.example.com)
• VM creation fails with this errors on the controller node
  

nova-api.log

HTTP exception thrown: Flavor gpu_flavor could not be found.

nova-scheduler.log

Filter PciPassthroughFilter returned 0 hosts
Filtering removed all hosts for the request with instance ID '131d5c1c-1927-42c0-bb48-618c05d31c2a'. Filter results: ['PciPassthroughFilter: (start: 19, end: 0)']

nova-conductor.log

Failed to schedule instances: nova.exception_Remote.NoValidHost_Remote: No valid host was found. There are not enough hosts available.

If I understand correctly it's a cascading error generating from the flavor not found, even though it exists... Anyone has encountered something like this/has suggestions? Am I missing some config?

Thanks in advance

-- 
Francesco Di Nucci
System Administrator 
Compute & Networking Service, INFN Naples

Email: francesco.dinucci@na.infn.it