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+.\" $NetBSD: vio9p.4,v 1.4 2021/10/21 13:21:53 andvar Exp $
+.\"
+.\" Copyright (c) 2019 Internet Initiative Japan, Inc.
+.\" All rights reserved.
+.\"
+.\" 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 October 24, 2019
+.Dt VIO9P 4
+.Os
+.Sh NAME
+.Nm vio9p
+.Nd VirtIO 9p front-end driver
+.Sh SYNOPSIS
+.Cd "vio9p* at virtio?"
+.Sh DESCRIPTION
+In conjunction with
+.Xr mount_9p 8 ,
+the
+.Nm
+driver enables a
+.Nx
+system running as a VM guest to mount an exported file system
+by the host via virtio-9p.
+It exports a 9p end-point of virtio-9p via a character device file for
+.Xr mount_9p 8 .
+.Pp
+Each exported file system is assigned a character device and accessible via
+.Pa /dev/vio9p0 ,
+.Pa /dev/vio9p1
+and so on, respectively, in exporting order by the host.
+.Sh FILES
+.Bl -tag -width XdevXvio9pX -compact
+.It Pa /dev/vio9p?
+.El
+.Sh EXAMPLES
+The following command mounts the first exported file system by the host at
+.Pa /mnt/9p :
+.Bd -literal -offset indent
+# mount_9p -cu /dev/vio9p0 /mnt/9p
+.Ed
+.Sh SEE ALSO
+.Xr virtio 4 ,
+.Xr mount_9p 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 10.0 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Ryota Ozaki Aq Mt ozaki-r@iij.ad.jp .