Never mind, figured this out …
In case someone else is interested, describing what I did below:
After doing the usual IOMMU and vfio stuff (to isolate the desired PCI device from the host), the device can be passed through to the host as shown in the commands below:
akriadmin@c4akri01:~$ lxc profile show vm
config:
raw.qemu: -device vfio-pci,host=41:00.0
description: LXD profile for virtual machines
devices: {}
name: vm
used_by: []
akriadmin@c4akri01:~$ lxc launch --target c4akri01 --vm images:ubuntu/18.04 --profile default --profile vm
Creating the instance
Instance name is: loving-peacock
Starting loving-peacock
akriadmin@c4akri01:~$