There is two different goals when virtualization is using: Fully virtualized host usually works slow, so need to make expertise of the task to find another way. Fully virtualized host can communicate with infrastructure by very limited set of options but very securely. Chrooted environment works as fast as host system (very fast for Gentoo hosts), but need to be very carefull when configuring them. Gentoo supports different ways to virtualize, and I have expirience to choose the right way.