$NetBSD: patch-db,v 1.1 2009/01/24 18:57:59 bouyer Exp $

some device have I/O space but no mem space so checking iomem to grant
privileges is not enough.

--- xen/include/asm-x86/iocap.h.orig	2009-01-24 17:22:41.000000000 +0100
+++ xen/include/asm-x86/iocap.h	2009-01-24 17:23:24.000000000 +0100
@@ -15,6 +15,6 @@
     rangeset_contains_range((d)->arch.ioport_caps, s, e)
 
 #define cache_flush_permitted(d)                       \
-    (!rangeset_is_empty((d)->iomem_caps))
+    (!rangeset_is_empty((d)->iomem_caps) || !rangeset_is_empty((d)->arch.ioport_caps))
 
 #endif /* __X86_IOCAP_H__ */