diff --git a/20125-xc-parse-tuple-fix.patch b/20125-xc-parse-tuple-fix.patch
new file mode 100644
index 0000000..45e18bc
--- /dev/null
+++ b/20125-xc-parse-tuple-fix.patch
@@ -0,0 +1,45 @@
+# HG changeset patch
+# User Keir Fraser <keir.fraser@citrix.com>
+# Date 1251297719 -3600
+# Node ID ed672a604cc7d0acb9418b29cdc3d65ea84543e8
+# Parent  71389988f5d4e6417f7da1d86da984acd5118efc
+xend: Do not pass pointer to a 16-bit domid_t to PyArg_ParseTuple()
+when it expects a full integer.
+
+Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
+
+diff -r 71389988f5d4 -r ed672a604cc7 tools/python/xen/lowlevel/xc/xc.c
+--- a/tools/python/xen/lowlevel/xc/xc.c	Wed Aug 26 15:35:14 2009 +0100
++++ b/tools/python/xen/lowlevel/xc/xc.c	Wed Aug 26 15:41:59 2009 +0100
+@@ -654,10 +654,9 @@
+ static PyObject *pyxc_get_device_group(XcObject *self,
+                                          PyObject *args)
+ {
+-    domid_t domid;
+     uint32_t bdf = 0;
+     uint32_t max_sdevs, num_sdevs;
+-    int seg, bus, dev, func, rc, i;
++    int domid, seg, bus, dev, func, rc, i;
+     PyObject *Pystr;
+     char *group_str;
+     char dev_str[9];
+@@ -812,7 +811,7 @@
+ static PyObject *pyxc_dom_set_policy_cpuid(XcObject *self,
+                                            PyObject *args)
+ {
+-    domid_t domid;
++    int domid;
+ 
+     if ( !PyArg_ParseTuple(args, "i", &domid) )
+         return NULL;
+@@ -828,9 +827,8 @@
+ static PyObject *pyxc_dom_set_cpuid(XcObject *self,
+                                     PyObject *args)
+ {
+-    domid_t domid;
+     PyObject *sub_input, *config;
+-    unsigned int input[2];
++    unsigned int domid, input[2];
+     char *regs[4], *regs_transform[4];
+ 
+     if ( !PyArg_ParseTuple(args, "IIOO", &domid,
diff --git a/xen.changes b/xen.changes
index a09f056..10a35cc 100644
--- a/xen.changes
+++ b/xen.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Tue Sep 15 09:32:59 MDT 2009 - jfehlig@novell.com
+
+- bnc#513921 - Xen doesn't work get an eror when starting the
+  install processes or starting a pervious installed DomU
+  20125-xc-parse-tuple-fix.patch
+
 -------------------------------------------------------------------
 Mon Aug 24 10:31:36 MDT 2009 - carnold@novell.com
 
diff --git a/xen.spec b/xen.spec
index 9822c7b..ac1adef 100644
--- a/xen.spec
+++ b/xen.spec
@@ -176,7 +176,7 @@ Patch450:       disable_emulated_device.diff
 Patch500:       hv_tools.patch
 Patch501:       hv_xen_base.patch
 Patch502:       hv_xen_extension.patch
-Patch503:       hv_win7_eoi_bug.patch 
+Patch503:       hv_win7_eoi_bug.patch
 Patch999:       tmp_build.patch
 Url:            http://www.cl.cam.ac.uk/Research/SRG/netos/xen/
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build