https://blog.wongcw.com/2019/12/17/qemu-4-2%e7%99%bc%e5%b8%83%e9%87%9d%e5%b0%8dlinux%e8%99%9b%e6%93%ac%e5%8c%96%e9%80%b2%e8%a1%8c%e4%ba%86%e8%a8%b1%e5%a4%9a%e6%94%b9%e9%80%b2/