For the record to newbies:
1. Download windows update KB3063109 (this update from this page) to desktop. File name is windows6.x-hypervintegrationservices-x64.cab
2. Run PowerShell as Administrator: Dism /online /Add-Package...
This is a very new device added in qemu 2.7
The driver is available under latest virtio iso.
This is at the moment 0.1.132
You can download from here
https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/latest-virtio/virtio-win.iso...