xen: add the Xenbus sysfs and virtual device hotplug driver

This communicates with the machine control software via a registry
residing in a controlling virtual machine. This allows dynamic
creation, destruction and modification of virtual device
configurations (network devices, block devices and CPUS, to name some
examples).

[ Greg, would you mind giving this a review?  Thanks -J ]

Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: Greg KH <greg@kroah.com>
diff --git a/include/asm-i386/xen/hypervisor.h b/include/asm-i386/xen/hypervisor.h
index ebfa7e0..8e15dd2 100644
--- a/include/asm-i386/xen/hypervisor.h
+++ b/include/asm-i386/xen/hypervisor.h
@@ -42,6 +42,7 @@
 
 #include <asm/ptrace.h>
 #include <asm/page.h>
+#include <asm/desc.h>
 #if defined(__i386__)
 #  ifdef CONFIG_X86_PAE
 #   include <asm-generic/pgtable-nopud.h>