Description of problem

A short while back we added the 9p2000.L option to our 9p mounts, but I'm not seeing that set inside the container right now.
The code is:
https://github.com/kata-containers/runtime/blob/master/virtcontainers/kata_agent.go#L55

Expected result

I expect to see that 9p2000.L option set on any 9p mounts in the container when I do a mount command

Actual result

Seems the option does not make it through (to the agent?) - but from a quick browse I cannot see why not, and I cannot see how trans=virtio does make it. I suspect I am missing something, potentially obvious?

This was run with a HEAD of all items just now, but you can also see the mount output over on #195 does not show 9p2000 either.

background

I wanted to try something with the 9p options (the effects of adding msize=xxx), and this is the place I'd normally add that code - but if the 9p2000 is not making it through, then I suspect any msize mods won't make it either...