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-rw-r--r--include/xen/interface/features.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h
index 6d1384abfbdf..5a7bdefa06a8 100644
--- a/include/xen/interface/features.h
+++ b/include/xen/interface/features.h
@@ -83,6 +83,20 @@
*/
#define XENFEAT_linux_rsdp_unrestricted 15
+/*
+ * A direct-mapped (or 1:1 mapped) domain is a domain for which its
+ * local pages have gfn == mfn. If a domain is direct-mapped,
+ * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped
+ * is set.
+ *
+ * If neither flag is set (e.g. older Xen releases) the assumptions are:
+ * - not auto_translated domains (x86 only) are always direct-mapped
+ * - on x86, auto_translated domains are not direct-mapped
+ * - on ARM, Dom0 is direct-mapped, DomUs are not
+ */
+#define XENFEAT_not_direct_mapped 16
+#define XENFEAT_direct_mapped 17
+
#define XENFEAT_NR_SUBMAPS 1
#endif /* __XEN_PUBLIC_FEATURES_H__ */