How to use your GPU in a Hyper-V based VM?

Set the variables in add_vm_gpu_and_prepare_drivers.ps1 for your setup
Run add_vm_gpu_and_prepare_drivers.ps1 on the Host machine (Windows).
Run install_dxgkrnl.sh on VM.
Set VIDEO_CARDS="d3d12 intel i965 iris fbdev"
Re-emerge mesa.

To troubleshoot, try:

export MESA_D3D12_DEFAULT_ADAPTER_NAME=dxgkrnl glxinfo -B

For proper benchmarking: https://benchmark.unigine.com/valley