So IIUC your approach, you're exposing the actual GPU to the guest OS via PCI-passthrough. And in practice that means you'll want two GPUs: one for the host and one for the guest.

But looking at the online docs for VMWare Workstation, it sounds like they take a different approach: the guest VM has a virtual device driver that lets both host and guest OSs use the same GPU at the same time.

I would think the VMWare Workstation-like approach is preferred, because it avoids the hassle of using two graphics cards. I know that Workstation is expensive ($250) and not OSS. Besides those two reasons, are there still reasons to prefer the PCI-passthrough approach?