xen: disable vcpu_info placement for now

There have been several reports of Xen guest domains locking up when
using vcpu_info structure placement.  Disable it for now.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/x86/xen/enlighten.c

@@ -95,7 +95,7 @@ struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info;
  *
  * 0: not available, 1: available
  */
-static int have_vcpu_info_placement = 1;
+static int have_vcpu_info_placement = 0;
 
 static void __init xen_vcpu_setup(int cpu)
 {