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