before i switched back from linux to mac i took out my ssd and put it in a thunderbolt case. i can now boot it directly and everything works perfectly or i use virtualbox. sadly the permissions are a bit questionable(see below).

Also, one caveat is that the virtualbox vm write tops out somewhere around 100-120 mbyte/s (idr), while the boot from linux gives me 360.

    sudo VBoxManage internalcommands createrawvmdk -filename ~myuser/Library/VirtualBox/VDI/raw-linux.vmdk -rawdisk /dev/disk1
    sudo chmod 666 /dev/disk1*