diff -ru linux-2.6.18-xen.orig/arch/x86_64/Kconfig linux-2.6.18-xen/arch/x86_64/Kconfig
--- linux-2.6.18-xen.orig/arch/x86_64/Kconfig	2007-08-07 17:37:58.000000000 -0700
+++ linux-2.6.18-xen/arch/x86_64/Kconfig	2007-08-07 17:39:32.000000000 -0700
@@ -234,7 +234,7 @@
 config X86_XEN_GENAPIC
 	bool
 	depends X86_64_XEN
-	default XEN_PRIVILEGED_GUEST || SMP
+	default y
 
 config X86_LOCAL_APIC
 	bool