Nestes ESXi in ESXi
http://www.virtuallyghetto.com/2015/12/deploying-nested-esxi-is-even-easier-now-with-the-esxi-virtual-appliance.html
Nested ESXi in Hyper-V
Install a VMware ESXi 6.0 Hypervisor in a Hyper-V VM
How to send F11 to a KVM or nested ESXi form a MAC
FN+CMD+F11