LinuxQuestions.org - Installing 7.1 openbsd in vbox

The notes, at least from a while back, indicate that OpenBSD might need Virtualbox configured to use VT-x or AMD-V hardware virtualization support: https://www.virtualbox.org/wiki/Guest_OSes

Otherwise, I might suggest Qemu.

Code:

$ qemu-img create -f qcow2 obsd-qemu.img 10G



$ qemu-system-x86_64 \

        -name "OpenBSD in Qemu",process=openbsd \

        -net nic,model=e1000 \

        -net user,hostfwd=tcp::2022-:22 \

        -m 3G \

        -cpu host \

        -enable-kvm \

        -audiodev pa,id=snd0 \

        -device ich9-intel-hda \

        -device hda-duplex,audiodev=snd0 \

        -vga qxl \

        -drive format=qcow2,index=0,cache=none,media=disk,file=obsd-qemu.img \

        -D ~/logs/qemu.log 2> ~/logs/qemu-stderr.log \

        -cdrom install72.iso \

        -boot c;