We have a Windows-10 application which uses a virtual as part of the process. I am trying to get the application to work in a virtual environment, which of course will require nested virtualization. Using a libvirt xml description for a RHEL virtual where nested virtualization works, I installed windows-10, Hyper-v and the application software under the latest updates of Fedora 22. Windows-10 works great; however, VMBus device required for Hyper-V to work would not start and was flagged in the Device Manager. Trying to start a virtual resulted in the error that a component required by Hyper-V failed to start. I then ported the VM to VMWare Workstation 12 and in this environment t he VMBus device starts and nested virtuals start as expected. These results indicated that the VM was working correctly and the problem was likely with the QEMU-KVM hypervisor. Reading recent messages on the KVM and QEMU mail lists indicated that there were many KVM updates made to the 4.6.0-rc1 kernel, so I download, compiled and installed this kernel. I also cloned the latest version of qemu. When I run my Windows-10 VM in this environment with the latest updates. the VMBus device starts and there are not warnings in the Device Manager; however, the nested VMs do not start and the same error about a component required by Hyper-V failed to start. Do I need to turn something on to get this to work or is the Hyper-V support still under development? Please advise. Best, Jeff��.n��������+%������w��{.n�����o�^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�