digraph G {
   rankdir=LR;
   rank=same;
   bgcolor="transparent";
   uservml1 [label="User VM OS\nBootloader"]
   acrn_init [shape=box style="rounded,filled" label="ACRN"]
   acrn_switch [shape=box style="rounded,filled" label="ACRN"]
   uservml2 [label="User VM OS\nBootloader"]
   uservml1 -> acrn_init -> "Trusty" -> acrn_switch -> uservml2;
}