Comment 5 for bug 1222990

It would be good to use "extra_info" field to store other generic information.
For example, some PCI device has its corresponding name in the file system(e.g. /dev/sda) or device name (e.g. eth0).
 LXC host device passthrough and PCI passthrough can have a lot in common.
Most of the work done for PCI passthrough can be used for LXC passthrough.
However, LXC host device passthrough needs device name.
Storing that information in "extra_info" field can make PCI passthrough scheme usable for LXC device passthrough.