Your existing KVM plan received a complimentary upgrade!

Additional 51G Hardddisk. *yummy* Now what do I do with this?

How to add the new space to my partition table:

# sudo gpart recover vtbd0
# sudo gpart add -t freebsd-ufs vtbd0

The recover part is apparently necessary, because gpart stores important data at the end of the disk, which after the upgrade isn’t the end anymore.