86 lines
2.9 KiB
Groff
86 lines
2.9 KiB
Groff
.\" $NetBSD: xenbus.4,v 1.1 2011/01/11 00:45:04 jym Exp $
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.\"
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.\" Copyright (c) 2011 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jean-Yves Migeon <jym@NetBSD.org>.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 8, 2011
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.Dt XENBUS 4 xen
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.Os
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.Sh NAME
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.Nm xenbus
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.Nd Xen bus abstraction for paravirtualized drivers
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.Sh SYNOPSIS
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.Cd "xenbus* at hypervisor?"
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.Sh DESCRIPTION
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The
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.Nm
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interface offers an abstraction layer used for communications
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between domains.
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.Nm
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is mainly used by split paravirtualized drivers, so backend and frontend
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devices can exchange configuration information, properties, and
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statistics.
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.Pp
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.Nm
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is not used for data transfer (network frames, blocks,
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PCI commands, ...). This functionality is implemented by each paravirtualized
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driver independently, typically via shared memory pages and an event
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channel that serves as a virtual interrupt, for signaling.
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.Pp
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The
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.Nm
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abstraction offers guests the possibility to read and write information
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directly from and to XenStore, a centralized database accessible to
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all domains.
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For this reason, it also has an event channel associated to it, so that
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domains can post messages to the XenStore facility.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "xenbus0: using event channel %d"
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The event channel associated to the
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.Nm
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interface, for communication with the XenStore database.
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.El
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.Sh SEE ALSO
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.Xr pciback 4 ,
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.Xr xbd 4 ,
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.Xr xbdback 4 ,
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.Xr xennet 4 ,
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.Xr xpci 4 ,
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.Xr xvif 4
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 3.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Manuel Bouyer Aq bouyer@NetBSD.org .
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