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Cant't specify NVIDIA 2080Ti for Unigine Vally benchmarking on Ubuntu virtual machine

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I used virt-install to create a virtual machine(Ubuntu 20.04, 16 CPUs+20G memory).At the same time, I've passed a GPU whose BUS ID is 68:00.0.

virt-install --name ubuntu-vm  --memory 20480  --disk size=100 --cdrom  /home/qemu/ubuntu-20.04.3-desktop-amd64.iso  --vcpus 16 --os-type linux  --os-variant=ubuntu20.04  --network bridge=bridge0  --graphics spice,listen=0.0.0.0  --channel spicevmc,target.type=virtio --hostdev 68:00.0 --hostdev 68:00.1 --hostdev 68:00.2 --hostdev 68:00.3

After installing NVIDIA driver and excuting Unigine_Valley-1.0.run script, I started vally script.But I found FPS less than 5.When excuting vally script, I used nvidia-smi to check GPU resource.But GPU near zero load. Therefore,I was pretty sure about that vally didn't run on passthrough GPU

How can I specify passthrough GPU to run vally benchmark?

glxinfo


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benchmarking

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