1 files changed, 7 insertions, 0 deletions
diff --git a/block/io.c b/block/io.c
index 8b6dace056..f0b86c1d19 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2090,6 +2090,13 @@ int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child,
         return ret;
     }
 
+    /* If the request is misaligned then we can't make it efficient */
+    if ((flags & BDRV_REQ_NO_FALLBACK) &&
+        !QEMU_IS_ALIGNED(offset | bytes, align))
+    {
+        return -ENOTSUP;
+    }
+
     bdrv_inc_in_flight(bs);
     /*
      * Align write if necessary by performing a read-modify-write cycle.