vm: evict PTE entries for transferred vm-object pages

include/kernel/address-space.h

@@ -17,6 +17,8 @@ struct vm_area {
 	 * will avoid the area, but fixed address mappings in this area
 	 * will succeed. */
 	struct vm_object *vma_object;
+	/* the address space that this vm_area is a part of */
+	struct address_space *vma_space;
 	/* used to link to vm_object->vo_mappings */
 	struct queue_entry vma_object_entry;
 	/* the memory protection flags applied to this area */