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veertu

Actually gpu virtualization works quite similar to cpu. You don't pass a cpu core exclusively to a VM rather the cpu itself maintains independent contexts: for the host and each VM. When a CPU runs a VM it just switches the context. So is the GPU. You don't need two GPUs to make it work.
I hope in the near future Apple will release an API for GPU virtualization. In fact Intel Iris Pro devices already support GVT-d. The problem is that Iris Pro is only used in the expensive Macbook models, the cheaper one come with regular Iris that don't have hardware support for it
Currently in testing, in a few weeks we're hoping to release it on the AppStore
There will be soon!

Veertu – native Mac virtualization available on the AppStore

The very first native Mac virtualization software is released on the App Store. Veertu uses Apple's hypervisor framework for cpu virtualization. In addition Veertu doesn't require any kernel drivers and runs in a sandbox making it completely secure and reliable. Check it out: http://veertu.com

( Read More... | 3 comments | 9 points | on HN )