GPU resizable BAR support is coming in Linux kernel 6.1. It'd be great to support this natively in Unraid, somehow in the VM GUI or a setting or at least a documented script or how-to.
Great find, this worked for me after I was getting a blank screen and VM won't boot as soon as I turn on Resizable BAR in the BIOS. It worked fine bare metal, so I knew it was something to do with KVM but didn't know what.
I have an HP RTX 3090, motherboard is an ASRock ROMED8-2T (with beta BIOS that has ReBAR support and is not public yet).
Here's the GPUZ info from the VM:
Here's my lspci dump for the card:
I'm on Unraid 6.11.5 and VM is on Q35-7.1, W