diff -rN -u -p old-xen-64-4/xen/include/asm-x86/multicall.h new-xen-64-4/xen/include/asm-x86/multicall.h
--- old-xen-64-4/xen/include/asm-x86/multicall.h	2005-05-24 17:35:01.000000000 +0000
+++ new-xen-64-4/xen/include/asm-x86/multicall.h	2005-06-09 09:46:28.000000000 +0000
@@ -24,7 +24,8 @@
             "callq *(%%rax); "                           \
             "movq  %%rax,"STR(MULTICALL_result)"(%0); "  \
             : : "b" (_call)                              \
-            : "rax", "rdi", "rsi", "rdx", "rcx", "r8" ); \
+            : "rax", "rdi", "rsi", "rdx", "rcx", "r8", 	 \
+	      "r9", "r10", "r11");			 \
     } while ( 0 )
 
 #else