===== virtualbox to qemu/kvm =====

  - export a .ova file
  - extract it like an archive
  - convert vdi to qcow2
  - ''  qemu-img convert -f vdi -O qcow2 debian-kde.vdi debian-kde.qcow2''
  - ''macvtap'' network adapter. (will be hard to get host->guest networking, but meh)