Nvidia GTX 1070 Ti pass-through on 6.9.2 & 6.10.0-rc1 to Windows not working

[Letoh]

Last worked in 6.8.3.

Have tried lots of options to get a Windows VM to work since 6.8.3 release but after Windows install finishes and after logging in for the first time, at point where it detects the graphics card and updates driver, it black screens and reboots. Does a boot loop from that point onward.

If I change VM to VNC graphics and run DDU and remove Nvidia drivers I can get into the VM, but the moment I add a nvidia driver it boot loops again.

 

The video card works perfectly using the same setings when passed to a Manjaro VM.

 

Any suggestions would be awesome!

I have attached diagnostics.

tower-diagnostics-20210923-1620.zip

[Letoh]

Just tried dumping the 1070 vbios using spaceinvader's script and using it instead of the Techpowerup one.

 

Same result. VM works using standard generic display driver and goes into a boot loop the moment the nvidia driver is loaded. The nvidia installer recognises that the card is valid, but install does not complete successfully.

 

Again Manjaro VM works fine with the dumped vbios file.

 

Also tried running the following lines in a script:
echo 0 > /sys/class/vtconsole/vtcon0/bind
echo 0 > /sys/class/vtconsole/vtcon1/bind
echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind

This did not change the situation and I still cannot pass the video card to the VM and run with the nvidia driver (472.12) without the VM crashing and going into a boot loop.

tower-diagnostics-20210924-0857.zip