Code 43 "known bug" with Windows driver under KVM/Qemu

I’m running Windows 10 in KVM/Qemu with GPU passthrough to support CAD/CAM and a little light gaming.

The NVidia windows drivers fail in the VM with “Code 43”. This is apparently categorized as “known bug, won’t fix”. It’s reasonable to assume that it’s left unfixed in order to deter datacentre use of commodity hardware.

It can be worked around with some configuration gymnastics (and the use of an older driver), but it’s very, very annoying.

I attempted to register a complaint about this bug at the support email address, but I just got a form response directing me to this board. Is there an official NVidia bug report that I can refer to? And to whom should I complain?