I'm not sure if I understand well what you mean by "Will LXC passthrough will be PCI based?".
What is "BDF"?
I would say the PCI passthrough infrastructure can be used for LXC passthrough for PCI devices using extra_info field.
I believe that if extra_info field is flexible enough - such as json string -, supporting LXC host device passthrough for PCI device
is straightforward in most cases.
I'm not sure if I understand well what you mean by "Will LXC passthrough will be PCI based?".
What is "BDF"?
I would say the PCI passthrough infrastructure can be used for LXC passthrough for PCI devices using extra_info field.
I believe that if extra_info field is flexible enough - such as json string -, supporting LXC host device passthrough for PCI device
is straightforward in most cases.