This happened a while ago, and I’m just catching up to it: the virtio_scsi(4) driver has been added to DragonFly; ported from FreeBSD and worked on by a number of people. ‘man virtio‘ if you want background.
A running description of activity related to DragonFly BSD.
In case you don’t know much about Virtio SCSI, the link below is a good read. Talk about the differences between it and Virtual BLK
https://ervikrant06.wordpress.com/2016/10/16/difference-between-virtio-blk-vs-virtio-scsi/
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