[SOLVED] Having trouble with GPU passthrough

[rragu]

I've been trying and failing to get my graphics card passed through to a Windows 10 VM for a few hours now no matter what I try. I'm going to need some help to go any further.

 

I've been largely following this guide on setting up remote gaming

 

Details/Settings:

GTX 1080 Ti is in the motherboard's top slot (so I guess that makes it the primary GPU?)

ACS override: set to Both

VFIO: Both graphics and sound devices stubbed via Tools>System Devices

Boot: Legacy boot

 

After adding the graphics card with settings as detailed above and booting the VM, Device Manager doesn't recognize any nVidia card as being installed. All I see under Display Driver in Device Manager is Microsoft Basic Display Adapter and Microsoft Remote Display Adapter.

 

If I go ahead install the nVidia drivers anyway, I then get Code 43 (which I suppose isn't surprising at all if Windows doesn't recognize the GPU in the first place).

 

Ideas on how to move forward from here would be very much appreciated. Thanks!

Edited September 14, 2021 by rragu
clarity

[rragu]

EDIT: SOLVED

Looks like my vBIOS was the issue! Despite following SpaceInvaderOne's video/script to dump the vBIOS from my card, that vBIOS doesn't appear to work. it was only after I used one of the compatible vBIOSes from TechPowerUp that I was able to see the following in the VM's Device Manager:

 

I also undid the ACS override and stuck with i440fx as Machine Type

Edited September 14, 2021 by rragu