Index: kernel/generic/src/mm/backend_phys.c
===================================================================
--- kernel/generic/src/mm/backend_phys.c	(revision cda137838b55c7dc8701be316355a62a861016f9)
+++ kernel/generic/src/mm/backend_phys.c	(revision 22dfd380be327d91cff2394cd2f3d9143dd73a90)
@@ -52,4 +52,8 @@
 static void phys_destroy(as_area_t *);
 
+static bool phys_is_resizable(as_area_t *);
+static bool phys_is_shareable(as_area_t *);
+
+
 static int phys_page_fault(as_area_t *, uintptr_t, pf_access_t);
 
@@ -59,4 +63,7 @@
 	.share = phys_share,
 	.destroy = phys_destroy,
+
+	.is_resizable = phys_is_resizable,
+	.is_shareable = phys_is_shareable,
 
 	.page_fault = phys_page_fault,
@@ -87,4 +94,15 @@
 	/* Nothing to do. */
 }
+
+bool phys_is_resizable(as_area_t *area)
+{
+	return false;
+}
+
+bool phys_is_shareable(as_area_t *area)
+{
+	return true;
+}
+
 
 /** Service a page fault in the address space area backed by physical memory.