Other How to properly mount a directory via 9p (plan9) in the bhyve of a FreeBSD guest?

V

Vurefozu

Hello.
Host: FreeBSD 14.1
bhyve guest: FreeBSD 14.1

How is it possible to mount a directory via 9p protocol in a freebsd guest?
I'm using the vm-bhyve wrapper.

The official vm-bhyve documentation says:
VM guest conf:
Code: 
disk1_type="virtio-9p"
disk1_name="cache=/var/cache/pkg/"
disk1_dev="custom"

Mount in guest freebsd:
Code: 
# mount -t 9p -o trans=virtio cache /var/cache/pkg
mount: cache: Invalid fstype: Invalid argument

How to mount the 9p directory correctly?
 
On FreeBSD 15-current it is possible to mount via the module /boot/kernel/virtio_p9fs.ko

Code: 
/boot/loader.conf
virtio_p9fs_load=YES

mount -t p9fs cache /mnt

But on FreeBSD 14, this module does not exist.
 
Vurefozu said:
On FreeBSD 15-current it is possible to mount via the module /boot/kernel/virtio_p9fs.ko

Code: 
/boot/loader.conf
virtio_p9fs_load=YES

mount -t p9fs cache /mnt

But on FreeBSD 14, this module does not exist.
Click to expand...
It does at least as of 14.4:

sh: 
-> freebsd-version
14.4-RELEASE-p1
-> ls -l /boot/kernel/virtio_p9fs.ko
-r--r--r--  2 root wheel uarch   34K Mar  6 05:09 /boot/kernel/virtio_p9fs.ko

Which most probably means that you need at least such a host to export a 9p mount to a guest; and then the guest also needs 9p support to mount that, of course, thus raising the bar equally for the guest.
 
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