I'm trying to do nested virtualization in different hypervisor environments. Virtualbox does not support nested virtualization "out-of-the-box" according to my experience. VMWare Workstation Player 12 does, and I'm able to use Hyper-V on Windows 10 host. But under KVM (installed from the repository with virt-manager GUI) I'm not able to achieve the same goal. I get the following error from the Windows 10 guest: "Hyper-V cannot be installed. Virtualization support is disabled in firmware". I want to run Windows XP as guest OS in Windows 10 (Hyper-V) under Linux Mint 18 host. :-)
Any suggestions on how I can solve this problem ?