diff -r 9bbc4059c2d1 tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl	Fri May 18 16:31:09 2012 +0200
+++ b/tools/libxl/libxl_types.idl	Fri May 18 16:47:17 2012 +0200
@@ -30,6 +30,7 @@ MemKB = UInt(64, init_val = "LIBXL_MEMKB
 #
 
 libxl_domain_type = Enumeration("domain_type", [
+    (-1, "INVALID"),
     (1, "HVM"),
     (2, "PV"),
     ])