[stefanha]

9P is a filesystem protocol (like NFS or CIFS) rather than a local file system (like btrfs or NTFS). It's used to share files between the host and the guest. That way there's no need to copy files between the host and the guest.

[SkipperCat]

Thanks for the clarification and another example of my ignorance about it. The only time I've ever seen it is when I was trying to build a "slender" kernel and I was removing all the stuff I've never used(eg: 9P ).

The only thing I did know about it was that it was named after the movie "Plan 9 from Outer Space". Kinda cool reference.