I actually don't know much about nested virtualization. Can it be done to arbitrary depths with modern hardware? One issue with being "recursive" is efficiency

I actually don't know much about nested virtualization. Can it be done to arbitrary depths with modern hardware? One issue with being "recursive" is efficiency. Ideally, running 500 levels deep would be just as fast as running at the top level. In language-based systems this can be achieved with inlining and optimization, but it's difficult in hardware, where there is much less semantic information available about the running code.