PCIe GPU Passthrough with 1 GPU on AMD 5900x

Synthetic Goop

New Member
Mar 15, 2021
I am attempting to pass through my main gpu (GTX 760) on an B550 Aorus Master MB with an amd 5900x processor.
(I do not need the GPU on my system and am perfectly comfortable managing things through ssh and the web interface.)

I have followed the guides and my GPU IOMMU group seems to be properly isolated (only the GPU and the GPU audio controller are on the same IOMMU group).
I am not sure if linux is properly unbinding the GPU though (logs are printed during the boot sequence, but stop halfway. I assume that this is when the vfio-pci driver is loaded)

However, when I start the VM, the Proxmox host immediately hard crashes without an error message.

How do I go about troubleshooting this issue?
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You can blacklist die Nvidia drivers so proxmox can't initialize the GPU. If proxmox initializes it, you can't passthrough the GPU.
I already have it blacklisted, I think. Here is the lspci output. Is there any other way to verify that proxmox isn't getting the gpu?

lspci -nnk -s 08:00
08:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK104 [GeForce GTX 760] [10de:1187] (rev a1)
    Subsystem: Gigabyte Technology Co., Ltd GK104 [GeForce GTX 760] [1458:360b]
    Kernel driver in use: vfio-pci
    Kernel modules: nvidiafb, nouveau
08:00.1 Audio device [0403]: NVIDIA Corporation GK104 HDMI Audio Controller [10de:0e0a] (rev a1)
    Subsystem: Gigabyte Technology Co., Ltd GK104 HDMI Audio Controller [1458:360b]
    Kernel driver in use: vfio-pci
    Kernel modules: snd_hda_intel
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