Ever wanted nested virtualization inside a virtual machine that you are running on a Hyper-V host? I have! Looking around the GUI, the option cannot be found - that's because it's not there! Here's how to enable it!Run the following in PowerShell swapping VM_NAME_HERE for the name of your VM.
To reverse your change, just change $true to $false. And that's it! Easy! I still wish that they would include the option the GUI, however.
Set-VMProcessor -VMName VM_NAME_HERE -ExposeVirtualizationExtensions $true