Convert IDE drive to virtio

Hi , I have a win2008 r2 x64 vm which is configured with an IDE type drive.

I would like to convert the IDE drive to a virtio drive without loosing the windows installation. I can' t find any official procedure to do this.

I was thinking of creating a second virtio hd same size of the ide drive and then transfer everything from one to the other drive by imaging the first drive. But even doing this there are other problems because the rhevm won't let me add a secondary vbootable drive.

Inned advise on this and what it would the best options without reinstalling the all windows vm.

Any suggestions?

thank you
Marcello