--- xen-4.9.0/tools/qemu-xen/hw/9pfs/9p.c.orig
+++ xen-4.9.0/tools/qemu-xen/hw/9pfs/9p.c
@@ -25,6 +25,10 @@
 #include "trace.h"
 #include "migration/migration.h"
 
+#ifdef __linux__
+#include <linux/limits.h> /* for XATTR_SIZE_MAX */
+#endif
+
 int open_fd_hw;
 int total_open_fd;
 static int open_fd_rc;