[arch-general] Virtualbox guest additions on custom kernel

[Ralf Mardorf]

I suspect you're missing an optional dependency.

$ pacman -Si virtualbox-guest-utils | grep non-stock
Optional Deps  : virtualbox-guest-dkms: Guest kernel source modules for non-stock kernels

It's likely that it will work as it does work for the host,
https://wiki.archlinux.org/index.php/VirtualBox#Hosts_running_a_custom_kernel , IOW I guess you need to install "virtualbox-guest-dkms", then run

# dkms install vboxhost/$(pacman -Q virtualbox|awk {'print $2'}|sed 's/\-.\+//') -k $(uname -rm|sed 's/\ /\//')

and after that to load the modules.