diff --git a/[refs] b/[refs]
index e43d8b2b52a5..4cbb595b76c6 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0725cbb97793d4e65bf148e4872959cdbb8c6ddd
+refs/heads/master: 45eb0d889862c813dfc98c95549c25acbfc99ab8
diff --git a/trunk/include/asm-x86/xen/hypercall.h b/trunk/include/asm-x86/xen/hypercall.h
index 25366641f3f8..d9e4cf7b23ac 100644
--- a/trunk/include/asm-x86/xen/hypercall.h
+++ b/trunk/include/asm-x86/xen/hypercall.h
@@ -388,6 +388,14 @@ HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 	return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 }
 
+#ifdef CONFIG_X86_64
+static inline int
+HYPERVISOR_set_segment_base(int reg, unsigned long value)
+{
+	return _hypercall2(int, set_segment_base, reg, value);
+}
+#endif
+
 static inline int
 HYPERVISOR_suspend(unsigned long srec)
 {