diff --git a/qemu/include/qemu/bitops.h b/qemu/include/qemu/bitops.h
index 9f3995ec..c7587b0b 100644
--- a/qemu/include/qemu/bitops.h
+++ b/qemu/include/qemu/bitops.h
@@ -26,6 +26,9 @@
 #define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
 #define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
 
+#define MAKE_64BIT_MASK(shift, length) \
+    (((~0ULL) >> (64 - (length))) << (shift))
+
 /**
  * set_bit - Set a bit in memory
  * @nr: the bit to set