Need help enabling legacy virtio devices (1af4:1000)

Solution In Progress - Updated -


  • The Routing application on vLC needs to analyze all the available devices and rebind all supported network interfaces to the DPDK driver. There is a list of supported devices that includes only one "legacy" device from OpenStack: Virtio Network Device, 1af4:1000. If the Routing capsule can't find supported devices - it can't start properly and will fail.

  • We are trying to figure out how to enable the Legacy Mode for the Network driver in RHOSP 17.1 during the instance creation or a workraound to enforce RHOSP 17.1 usage of virtio-transitional.

  • Guests with q35 machine_type are using the (modern) pci IDs and our software doesn't detect 1af4:1041, it needs 1af4:1000 (legacy):

docs/specs/pci-ids.txt:1af4 vendor ID
docs/specs/pci-ids.txt:1af4:1000  network device (legacy)
docs/specs/pci-ids.txt:1af4:1001  block device (legacy)
docs/specs/pci-ids.txt:1af4:1002  balloon device (legacy)
docs/specs/pci-ids.txt:1af4:1003  console device (legacy)
docs/specs/pci-ids.txt:1af4:1004  SCSI host bus adapter device (legacy)
docs/specs/pci-ids.txt:1af4:1005  entropy generator device (legacy)
docs/specs/pci-ids.txt:1af4:1009  9p filesystem device (legacy)
docs/specs/pci-ids.txt:1af4:1041  network device (modern)
docs/specs/pci-ids.txt:1af4:1042  block device (modern)
docs/specs/pci-ids.txt:1af4:1043  console device (modern)
docs/specs/pci-ids.txt:1af4:1044  entropy generator device (modern)
docs/specs/pci-ids.txt:1af4:1045  balloon device (modern)
docs/specs/pci-ids.txt:1af4:1048  SCSI host bus adapter device (modern)
docs/specs/pci-ids.txt:1af4:1049  9p filesystem device (modern)
docs/specs/pci-ids.txt:1af4:1050  virtio gpu device (modern)
docs/specs/pci-ids.txt:1af4:1052  virtio input device (modern)
docs/specs/pci-ids.txt:1af4:10f0  Available for experimental usage without registration.  Must get
docs/specs/pci-ids.txt:1af4:10ff  upstream merge or shipping a distro/product) to avoid conflicts.
docs/specs/pci-ids.txt:1af4:1100  Used as PCI Subsystem ID for existing hardware devices emulated
docs/specs/pci-ids.txt:1af4:1110  ivshmem device (shared memory, docs/specs/ivshmem-spec.txt)


  • Red Hat OpenStack Platform 17.1 (RHOSP)

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