Configure a PCI Alias in Nova¶

PCI passthrough devices are exposed to VMs using system-wide PCI alias.

About this task

Each alias specifies PCI matching optional attributes: vendor_id, product_id, and device_type.

where

name: is a string identifying the PCI alias
device_id: is the device_id value obtained from the device list
vendor_id: is the vendor_id value obtained from the device list
device_type: is a string indicating the type of PCI device to add (valid values are: type-PCI, type-PF, or type-VF)

The following command displays the current configured PCI aliases:

$ kubectl exec -it -n openstack \
$(kubectl get pod --selector=application=nova,component=os-api -o name -n openstack) -- grep -e '\[pci\]' -e alias /etc/nova/nova.conf

By default it contains a list of general PCI aliases, such as:

[pci]
alias = {"vendor_id": "8086", "product_id": "0435", "name": "qat-dh895xcc-pf"}
alias = {"vendor_id": "8086", "product_id": "0443", "name": "qat-dh895xcc-vf"}
alias = {"vendor_id": "8086", "product_id": "37c8", "name": "qat-c62x-pf"}
alias = {"vendor_id": "8086", "product_id": "37c9", "name": "qat-c62x-vf"}
alias = {"name": "gpu"}

Additional PCI aliases may configured using a helm override for nova.

The following example replaces the previous list of PCI aliases with a custom list.

Procedure

Create a yaml configuration file containing the configuration update.

~(keystone_admin)]$ cat << EOF > ./gpu_override.yaml
conf:
  nova:
    pci:
      alias:
        type: multistring
        values:
        - '{"vendor_id": "8086", "product_id": "0435", "name":
          "qat-dh895xcc-pf"}'
        - '{"vendor_id": "8086", "product_id": "0443", "name":
          "qat-dh895xcc-vf"}'
        - '{"vendor_id": "8086", "product_id": "37c8", "name":
          "qat-c62x-pf"}'
        - '{"vendor_id": "8086", "product_id": "37c9", "name":
          "qat-c62x-vf"}'
        - '{"name": "gpu"}'
        - '{"vendor_id": "102b", "product_id": "0522", "name":
          "matrox-g200e"}'
        - '{"vendor_id": "10de", "product_id": "13f2", "name":
          "nvidia-tesla-m60"}'
        - '{"vendor_id": "10de", "product_id": "1b38", "name":
          "nvidia-tesla-p40"}'
        - '{"vendor_id": "10de", "product_id": "1eb8",
          "device_type":
          "type-PF", "name": "nvidia-tesla-t4-pf"}'
EOF

Update the Helm overrides using the new configuration file.

~(keystone_admin)]$ system helm-override-update --reuse-values --values ./gpu_override.yaml stx-openstack nova openstack

Apply the changes.

~(keystone_admin)]$ system application-apply stx-openstack

Configure a PCI Alias in Nova

Configure a PCI Alias in Nova¶

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