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+.\"	$OpenBSD: pvbus.4,v 1.1 2015/07/21 03:40:01 reyk Exp $
+.\"
+.\" Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org>
+.\" Copyright (c) 2006 Jason McIntyre <jmc@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: July 21 2015 $
+.Dt PVBUS 4
+.Os
+.Sh NAME
+.Nm pvbus
+.Nd paravirtual device tree root
+.Sh SYNOPSIS
+.Cd "pvbus0 at mainbus0"
+.Sh DESCRIPTION
+.Nm
+is used on virtual machines that are running on hypervisors.
+It provides a pseudo-bus for all paravirtual devices that do not
+attach to a well-known bus like
+.Xr pci 4 .
+The
+.Nm
+driver is responsible for detecting the hypervisor interface,
+checking the capabilities, and attaching the paravirtual devices.
+.Ss Supported hypervisors
+.Bl -tag -width 13n -offset ind -compact
+.It Xr KVM
+Kernel-based Virtual Machine
+.It Xr Hyper-V
+Microsoft Hyper-V
+.It Xr VMware
+VMware vSphere Hypervisor and ESXi
+.It Xr Xen
+Xen VMM
+.El
+.Pp
+Note that a hypervisor can attempt to emulate other hypervisors, so
+multiple hypervisor interfaces may be available on the same host.
+.Ss VMware paravirtual devices
+.Bl -tag -width 13n -offset ind -compact
+.It Xr vmt 4
+VMware Tools driver
+.El
+.Sh SEE ALSO
+.Xr autoconf 4 ,
+.Xr intro 4 ,
+.Xr mainbus 4
+.Sh HISTORY
+The
+.Nm
+pseudo-bus first appeared in
+.Ox 5.8 .
+.Sh AUTHORS
+The
+.Nm
+pseudo-bus was written by
+.An Reyk Floeter Aq Mt reyk@openbsd.org .