1.\" $OpenBSD: vio.4,v 1.9 2013/07/16 16:05:49 schwarze Exp $ 2.\" 3.\" Copyright (c) 2012 Stefan Fritsch <sf@sfritsch.de> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: July 16 2013 $ 18.Dt VIO 4 19.Os 20.Sh NAME 21.Nm vio 22.Nd VirtIO network device 23.Sh SYNOPSIS 24.Cd "vio* at virtio? flags 0x00" 25.Sh DESCRIPTION 26The 27.Nm 28driver provides support for the 29.Xr virtio 4 30network interface provided by bhyve, KVM, QEMU, and VirtualBox. 31.Pp 32Setting flags to 0x02 disables the RingEventIndex feature. 33This can be tried as a workaround for possible bugs in host implementations or 34.Nm 35at the cost of slightly reduced performance. 36.Sh SEE ALSO 37.Xr intro 4 , 38.Xr virtio 4 39.Sh HISTORY 40The 41.Nm 42driver first appeared in 43.Ox 5.3 . 44.Sh AUTHORS 45.An -nosplit 46The 47.Nm 48driver was ported to 49.Ox 50and improved by 51.An Stefan Fritsch Aq Mt sf@sfritsch.de . 52It is based on the 53.Nx 54.Nm vioif 55driver by 56.An Minoura Makoto . 57