| VIOCON(4) | Device Drivers Manual | VIOCON(4) | 
viocon —
viocon* at virtio?
viocon driver provides support for the
  virtio(4) console interface
  provided by KVM, QEMU, and others.
It provides serial ports that are attached as ttys.
viocon driver first appeared in
  OpenBSD 5.9.
viocon driver was written for
  OpenBSD by Stefan Fritsch
  <sf@sfritsch.de>. It was
  ported to NetBSD 10.0.
The multiport feature is not yet supported.
| August 13, 2022 | NetBSD 10.0 |