I'm also interested in this, but since it looks like you're new around here I'll give you a heads up. AMD is 1/30th of the size of Intel and doesn't really have the resources to test everything that you have in that list. It's amazing they can actually compete. I wouldn't expect any corporate assistance on this one unless you represent a very large customer like Amazon and you want to use GPUs in your next cluster.
Good luck and I'm interested in hearing if you have any success.
I think that the VMWare community might have better answers to your questions:
VMWare Workstation/Server and VMWare ESX are different things. VMWare workstation sits on top of your host OS, so your virtual OS has to go through the host before accessing hardware. In contrast, ESX is sitting just in top of the hardware (so it has direct access to it).
About GPU code performance, once the code and data is on the GPU it runs independently from the host so I would expect no overheads due to virtualization.