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+.\"	$NetBSD: xenbus.4,v 1.3 2014/03/18 18:20:39 riastradh Exp $
+.\"
+.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jean-Yves Migeon <jym@NetBSD.org>.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd January 8, 2011
+.Dt XENBUS 4 xen
+.Os
+.Sh NAME
+.Nm xenbus
+.Nd Xen bus abstraction for paravirtualized drivers
+.Sh SYNOPSIS
+.Cd "xenbus* at hypervisor?"
+.Sh DESCRIPTION
+The
+.Nm
+interface offers an abstraction layer used for communications
+between domains.
+.Nm
+is mainly used by split paravirtualized drivers, so backend and frontend
+devices can exchange configuration information, properties, and
+statistics.
+.Pp
+.Nm
+is not used for data transfer (network frames, blocks,
+PCI commands, ...). This functionality is implemented by each paravirtualized
+driver independently, typically via shared memory pages and an event
+channel that serves as a virtual interrupt, for signaling.
+.Pp
+The
+.Nm
+abstraction offers guests the possibility to read and write information
+directly from and to XenStore, a centralized database accessible to
+all domains.
+For this reason, it also has an event channel associated to it, so that
+domains can post messages to the XenStore facility.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "xenbus0: using event channel %d"
+The event channel associated to the
+.Nm
+interface, for communication with the XenStore database.
+.El
+.Sh SEE ALSO
+.Xr pciback 4 ,
+.Xr xbd 4 ,
+.Xr xbdback 4 ,
+.Xr xennet 4 ,
+.Xr xpci 4 ,
+.Xr xvif 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 3.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Manuel Bouyer Aq Mt bouyer@NetBSD.org .