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A UUID is normally set as a vf_token to correspond the VFs with the PFs, if they are both bound by the vfio-pci driver. This is true for iommufd-based approach and container-based approach. The token can be set either during device creation (VFIO_GROUP_GET_DEVICE_FD) in container-based approach or during iommu bind (VFIO_DEVICE_BIND_IOMMUFD) in the iommu-fd case. Hence extend the functions, vfio_pci_iommufd_setup() and vfio_pci_container_setup(), to accept vf_token as an (optional) argument and handle the necessary setup. No functional changes are expected. Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> Reviewed-by: David Matlack <dmatlack@google.com> Reviewed-by: Vipin Sharma <vipinsh@google.com> Tested-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20260505212838.1698034-5-rananta@google.com Signed-off-by: Alex Williamson <alex@shazbot.org>