I tried to search around, almost suggest to tried VMWare Fusion 5+ which support ‘workaround’ to work with Microsoft’s Hyper-V to run that Windows Phone 8 emulator.
But for me, I purchased Parallel Desktop 8 with love, and plan to use it for a long time. No need to try on VMWare Fusion, even if it works. (because that means I have to buy one more app). So I believe there’s better way to make Parallel Desktop work with Hyper-V.