I have checked the detail.
This is why I didn't have to enter the password to reboot the virtual machine.
I did twice; One is after running dd if=miniroot??.fs of=/dev/vtbd0 bs=512k. The other is after installation of OpenBSD.
dd if=miniroot??.fs of=/dev/vtbd0 bs=512k
ssh -i ~/.ssh/%id_rsa% root@%YOUR-HOST%
I hope this would be the answer to your question.
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