I have a VM in a cloud windows 2012 r2, backend hypervisior is VMware. I tried to do nested VM, so I installed Workstation on my VM and then try to build a ESXi VM and I get an error. I went in VM setting and selected the box for VT-x in workstation but still no joy. I called the support people and asked them to check the parent VM VT-x setting. they checked the setting in Virtual Center and there were four options and we tried all 4 options in vcenter and still no joy.I have no control of physical host as they won't make any changes on physical host and ECV is enabled for all host in the cluster.
This virtual machine is configured for 64-bit guest operating systems. However, 64-bit operation is not possible.
This host does not support Intel VT-x.
For more detailed information, see http://vmware.com/info?id=152.
So I believe this is how it looks like
Physical host -> Parent VM -> Workstation 10 -> VM ESXi 5.5 failed to boot up.