Import virtio base, PCI front-end, and net/block/balloon drivers.

Tested on Qemu/KVM, VirtualBox, and BHyVe.

Currently built as modules-only on i386/amd64. Man pages not yet hooked
up, pending review.

Submitted by:	Bryan Venteicher  bryanv at daemoninthecloset dot org
Reviewed by:	bz
MFC after:	4 weeks or so

1 files changed, 64 insertions, 0 deletions

diff --git a/share/man/man4/virtio_balloon.4 b/share/man/man4/virtio_balloon.4
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+.\" Copyright (c) 2011 Bryan Venteicher
+.\" 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 AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 4, 2011
+.Dt VIRTIO_BALLOON 4
+.Os
+.Sh NAME
+.Nm virtio_balloon
+.Nd VirtIO Memory Balloon driver
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device virtio_balloon"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+virtio_balloon_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+device driver provides support for VirtIO memory balloon devices.
+.Pp
+The memory balloon allows the guest to, at the request of the
+hypervisor, return memory allocated to the hypervisor so it can
+be made available to other guests. The hypervisor can later
+signal the balloon to return the memory.
+.Sh SEE ALSO
+.Xr virtio 4
+.Sh HISTORY
+The
+.Nm
+driver was written by
+.An Bryan Venteicher Aq bryanv@daemoninthecloset.org .
+It first appeared in
+.Fx 9.0 .