Just a note for people finding this via google: Openbsd's virtio-block driver works reasonably well while its virtio-scsi driver is not yet stable. The solution to this problem is therefore to change qemu's commandline to use virtio-block instead of virtio-scsi. This argument should work:
-drive file=/path/to/image,if=virtio -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org