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.