Reading an Nvidia GPU temperature value from a libvirt Windows guest

get-nv-temp.sh

#!/bin/bash

GUEST_NAME=Win10_With_GPU

job_exited="false"
exec_result=$(virsh -c qemu:///system qemu-agent-command "$GUEST_NAME" '{"execute": "guest-exec", "arguments": { "path": "nvidia-smi.exe", "arg": [ "--format=csv,noheader", "--query-gpu=temperature.gpu" ], "capture-output": true }}')
exec_pid=$(echo "$exec_result" | jq ".return.pid")

while [ "$job_exited" == "false" ]; do
    exec_job_data=$(virsh -c qemu:///system qemu-agent-command "$GUEST_NAME" '{"execute": "guest-exec-status", "arguments": { "pid": '" ${exec_pid}}}")
    job_exited=$(echo "$exec_job_data" | jq '.return.exited')

    if [ "$job_exited" == "false" ]; then
        sleep .1s
        continue
    fi

    echo "$exec_job_data" | jq '.return["out-data"]' | tr -d '"' | base64 --decode
    break
done

This Bash script executes the "nvidia-smi.exe" utility on a Windows-based guest to extract the GPU temperature value of an Nvidia GPU passed through to that guest. This script requires the Qemu Guest Agent to be installed on the guest, as well as the appropriate agent channel to be configured in the libvirt guest XML definition.

Props for helping bring this feature to CoolerControl. I don't think I'll ever need it myself, but it is very nice of you :)

@pallaswept don't thank me yet for CoolerControl; the code's not written yet ;)

It's the thought that counts.