Xen

There is not VirtualBox port that allows for NetBSD to be the host OS. Virutalization in NetBSD is done by using Xen. Using this web page http://netbsd0.blogspot.com/2012/05/centos-under-netbsdxen-in-15-minutes.htmlI was able to install Xen, but I was never able to get it to function correctly. Part of the instruction for installing Xen and using NetBSD as the DOM0 require the use of NetBSD-Xen kernel, the kernels are located here http://ftp.netbsd.org/pub/NetBSD/NetBSD-6.0.1/amd64/binary/kernel/Hopefully you'll have better luck then I. After 3 days, I just gave up and so ended my exploration of NetBSD.