1.\" $OpenBSD: virtio.4,v 1.16 2019/05/26 20:37:03 jmc 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: May 26 2019 $ 18.Dt VIRTIO 4 19.Os 20.Sh NAME 21.Nm virtio 22.Nd VirtIO support driver 23.Sh SYNOPSIS 24.Cd "virtio* at fdt?" 25.Cd "virtio* at pci? flags 0x00" 26.Sh DESCRIPTION 27The 28.Nm 29driver provides support service for paravirtualized devices using the VirtIO 30protocol. 31Such devices are provided by bhyve, KVM, QEMU, VirtualBox, and 32.Xr vmm 4 . 33.Pp 34Currently there are drivers for the following 35.Nm 36devices: 37.Pp 38.Bl -tag -width "vioscsi(4)XXX" -offset indent -compact 39.It Xr vio 4 40VirtIO network device 41.It Xr vioblk 4 42VirtIO disk 43.It Xr viocon 4 44VirtIO console device 45.It Xr viomb 4 46VirtIO memory ballooning driver 47.It Xr viornd 4 48VirtIO random number device 49.It Xr vioscsi 4 50VirtIO SCSI adapter 51.It Xr vmmci 4 52.Xr vmm 4 53control interface 54.El 55.Pp 56The 57.Nm 58driver conforms to the virtio 0.9.5 specification. 59The virtio 1.0 standard is only supported for PCI devices. 60.Pp 61By default 0.9 is preferred over 1.0. 62This can be changed by setting the bit 0x4 in the flags. 63Setting the bit 0x8 in the flags disables 1.0 support completely. 64.Sh SEE ALSO 65.Xr intro 4 66.Sh HISTORY 67The 68.Nm 69driver first appeared in 70.Ox 5.3 . 71.Sh AUTHORS 72.An -nosplit 73The 74.Nm 75driver was ported to 76.Ox 77and improved by 78.An Stefan Fritsch Aq Mt sf@sfritsch.de . 79It is based on the 80.Nx 81driver by 82.An Minoura Makoto . 83.Sh BUGS 84.Nm 85big-endian architectures are not yet supported. 86