--- old/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp	2020-07-08 13:30:54.738729582 +0800
+++ new/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp	2020-07-08 13:30:54.486728140 +0800
@@ -449,6 +449,15 @@
     UseMontgomerySquareIntrinsic = true;
   }
 
+  int min_vector_size = 8;
+
+  if (!FLAG_IS_DEFAULT(MaxVectorSize)) {
+    if (MaxVectorSize < min_vector_size) {
+      warning("MaxVectorSize must be at least %i on this platform", min_vector_size);
+      FLAG_SET_DEFAULT(MaxVectorSize, min_vector_size);
+    }
+  }
+
   if (FLAG_IS_DEFAULT(OptoScheduling)) {
     OptoScheduling = true;
   }