1.\" $NetBSD: virtio.4,v 1.5 2012/03/08 22:52:22 wiz Exp $ 2.\" 3.\" Copyright (c) 2011 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 16.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\" POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd November 5, 2011 28.Dt VIRTIO 4 29.Os 30.Sh NAME 31.Nm virtio 32.Nd Para-virtualized I/O in a virtual machine 33.Sh SYNOPSIS 34.Cd "virtio* at pci? dev ? function ?" 35.Cd "ld* at virtio?" 36.Cd "vioif* at virtio?" 37.Cd "viomb* at virtio?" 38.Sh DESCRIPTION 39.Nm 40defines an interface for efficient, standard and extensible I/O between the 41hypervisor and the virtual machine. 42The 43.Nm 44device driver represents an emulated PCI device that the hypervisor makes 45available to the virtual machine. 46.Pp 47.Nm 48driver itself provides the core infrastructure to communicate 49with the hypervisor (called virtqueues) and supports the following devices: 50.Bl -tag -width xxxxx 51.It Xr ld 4 52A Disk device. 53.It Xr vioif 4 54An Ethernet device. 55.It Xr viomb 4 56A pseudo-device to release memory back to the hypervisor. 57.El 58.Sh SEE ALSO 59.Xr ld 4 , 60.Xr pci 4 , 61.Xr vioif 4 , 62.Xr viomb 4 63.Pp 64.Rs 65.%A Rusty Russell, IBM Corporation 66.%T Virtio PCI Card Specification 67.%U http://ozlabs.org/~rusty/virtio-spec/ 68.Re 69.Sh HISTORY 70The 71.Nm 72driver first appeared in 73.Nx 6.0 . 74