virtio_9p?

[orent]

The client is built into linux guests and the server is a separate process that uses only simple userspace filesystem access and should be easy to port. IIUC, the missing part is setting up the communication channel over a virtio ring.

Any plans on supporting 9p filesystem access?

Any pointers on where I might start doing it myself?

[brad-x]

@orent if you're feeling adventurous, hyperkit is a pretty direct descendant of XHyve and they've added 9p support (oddly it hasn't been contributed back here.)

moby/hyperkit@20e6d92 is a great place to start for bringing support into xhyve itself

[brad-x]

@orent I think we can test building xhyve with elements of the above commit, but I've been failing to find a userspace 9p server to connect it to. Any recommendations?

[orent]

This one is apparently meant to be used with bhyve:
https://github.com/conclusiveeng/lib9p

There is a good implementation in qemu, but it is GPLed. I guess it should be OK as a separate executable with source code clearly segregated in a subdirectory, but this is up to you, of course.

There are two projects mentioned in the hyperkit commit in Go and in ocaml.

A rust implementation in Google's crosvm, used as part of Crostini (Linux on ChromeOS).
https://chromium.googlesource.com/chromiumos/platform/crosvm

[orent]

lib9p was added to the FreeBSD tree two years ago.