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Document commands used to send VM IP to Xen host

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.\"	$OpenBSD: xen.4,v 1.3 2021/10/21 15:56:17 denis Exp $
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.\" Copyright (c) 2015 Mike Belopuhov
.\"
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.Dd $Mdocdate: October 21 2021 $
.Dt XEN 4
.Os
.Sh NAME
.Nm xen
.Nd Xen domU nexus device
.Sh SYNOPSIS
.Cd "xen0 at pvbus?"
.Sh DESCRIPTION
.Nm
driver performs HVM domU guest initialization, provides abstraction for
virtual Xen interrupts, access to the XenStore configuration storage as
well as a device probing facility for paravirtualized devices such as
disk and network interfaces.
.Pp
When running under XenServer, to let the host know that the guest has
finished initializing and to allow graceful shutdown, set the following
XenStore properties with
.Xr hostctl 8
in
.Xr rc.local 8 :
.Bd -literal -offset indent
ostype=$(sysctl -n kern.ostype)
osrelease=$(sysctl -n kern.osrelease)

# XenServer Tools version
hostctl attr/PVAddons/MajorVersion 6
hostctl attr/PVAddons/MinorVersion 2
hostctl attr/PVAddons/MicroVersion 0
hostctl attr/PVAddons/BuildVersion 76888
hostctl attr/PVAddons/Installed 1

# OS version
hostctl data/os_name "$ostype $osrelease"
hostctl data/os_uname $osrelease
hostctl data/os_distro $ostype

# Inform Xen of IPs bound to the VM
hostctl attr/vif/0/ipv4/0 192.0.2.1
hostctl attr/vif/0/ipv6/0 2001:db8::1

# Update XenStore
hostctl data/updated 1
.Ed
.Sh SEE ALSO
.Xr autoconf 4 ,
.Xr intro 4 ,
.Xr pvbus 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 5.9 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Mike Belopuhov Aq Mt mikeb@openbsd.org
from scratch, inspired by the
.Fx
implementation.