VIO(4) | Device Drivers Manual | VIO(4)

# NAME

`vio` — VirtIO network device

# SYNOPSIS

`vio* at virtio? flags 0x00`

# DESCRIPTION

The `vio` driver provides support for the virtio(4) network interface provided by bhyve, KVM, QEMU, VirtualBox, and vmd(8).

Setting the bit 0x2 in the flags disables the RingEventIndex feature. This can be tried as a workaround for possible bugs in host implementations of `vio` at the cost of slightly reduced performance.

Setting the bit 0x100 in the flags forces the interface to be always in promiscuous mode. This can be used as a workaround for a bug in QEMU before version 1.7.2 that prevents packets with a VLAN tag from being sent to the guest.

# SEE ALSO

intro(4), virtio(4)

# HISTORY

The `vio` driver first appeared in OpenBSD 5.3.

# AUTHORS

The `vio` driver was ported to OpenBSD and improved by Stefan Fritsch <sf@sfritsch.de>. It is based on the NetBSD `vioif` driver by Minoura Makoto.

May 24, 2021 | Debian