#!/bin/bash
#
# xenpciexport	Script to start and stop the Xen PCI forwarding to guests.
#
# Author:       ZoltarStark http://www.olivetalks.com
#
# chkconfig: 2345 97 02
# description: Sets up PCI forwarding for Xen guests.

# Source function library.
. /etc/rc.d/init.d/functions

RETVAL=0
if [ ! -d /proc/xen ]; then
	exit 0
fi
if ! grep -q "control_d" /proc/xen/capabilities ; then
	exit 0
fi
prog="Xen PCI export"
# which PCI device to export to the guest
SLOT=0000:00:1d.1

case "$1" in
  start)
	echo -n $"Starting $prog: "
	# Export a USB controller to guest
	modprobe pciback
	sleep 2
	# Unbind the host USB driver
	echo -n ${SLOT} > /sys/bus/pci/drivers/uhci_hcd/unbind 
	# Add a new slot to the PCI Backend's list
	echo -n ${SLOT} > /sys/bus/pci/drivers/pciback/new_slot
	# Now that the backend is watching for the slot, bind to it
	echo -n ${SLOT} > /sys/bus/pci/drivers/pciback/bind
        RETVAL=$?
	;;
  stop)
	echo -n $"Stopping $prog: "
	# Unbind the guest USB driver
	echo -n ${SLOT} > /sys/bus/pci/drivers/pciback/unbind
	# Remove the slot from the PCI Backend's list
	echo -n ${SLOT} > /sys/bus/pci/drivers/pciback/remove_slot
	# Now bind the host USB driver to the slot
	echo -n ${SLOT} > /sys/bus/pci/drivers/uhci_hcd/bind 
	modprobe -r pciback
        RETVAL=$?
	;;
  status)
	test -d /sys/bus/pci/drivers/pciback/${SLOT}
	if [ $? = 0 ] ; then
	    echo PCI is exported to guests
	else
	    echo PCI is not exported to guests
	fi
        exit 0
	;;
  *)
	# do not advertise unreasonable commands that there is no reason
	# to use with this device
	echo $"Usage: $0 {start|stop|status}"
	exit 1
esac

if [ $RETVAL = 0 ] ; then
    echo_success
    echo
else
    echo_failure
    echo
fi
exit $RETVAL