Can amd64 do nested virtualization? (I suppose you could use Bochs, but the resulting performance would be awful.) I remember reading that IBM mainframes runni

Can amd64 do nested virtualization? (I suppose you could use Bochs, but the resulting performance would be awful.) I remember reading that IBM mainframes running VM can do that, there was this story about some developers stacking nested VMs about six or seven levels (without much loss of performance). There also was another story involving Hercules, a mainframe emulator. Someone had an IBM mainframe running Linux inside a VM, running Hercules on the Linux VM, which in turn ran VM again, with a machine running Linux, which in turn ran Hercules... I'm very fuzzy on the details, but it was a crazy setup.