From: Charles Coffing <ccoffing@novell.com>
Upstream:  no

Index: xen-3.1-testing/tools/python/xen/xm/main.py
===================================================================
--- xen-3.1-testing.orig/tools/python/xen/xm/main.py
+++ xen-3.1-testing/tools/python/xen/xm/main.py
@@ -1755,6 +1755,10 @@ def xm_debug_keys(args):
 def xm_top(args):
     arg_check(args, "top", 0)
 
+    # A hack to get a clear error message if ran as non-root
+    if os.geteuid() != 0:
+        raise IOError()
+
     os.execvp('xentop', ['xentop'])
 
 def xm_dmesg(args):