Could you pass the GPU (and all attendant hardware) transparently through Linux into a macOS VM, a bit like PCI passthrough (IIRC) is used for Windows VMs?
....hmm, now I think about that I realize it wouldn't have many non-tinkering oriented use cases. Right now I can only think of out-of-band firewalling.
It's... complicated. And yeah, at that point, it wouldn't have many use cases.
The hypervisor I wrote for research purposes passes through all the hardware (except the UART), which is easier than trying to do it on top of Linux. But it also doesn't try to be a secure hypervisor or anything like that (it would be trivial for the guest to take over).
....hmm, now I think about that I realize it wouldn't have many non-tinkering oriented use cases. Right now I can only think of out-of-band firewalling.