qemu run nixos + use kvm libguestfs video accelaration

fetch_nixos.sh

#!/bin/env bash

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# author: https://github.com/aaronedev
# date: 󰸗 2025-05-10

ISO=nixos-24.05-x86_64-linux.iso
IMG=nixos-24-05.qcow2
if [ ! -f "$ISO" ]; then
  wget https://channels.nixos.org/nixos-24.05/latest-nixos-gnome-x86_64-linux.iso -O $ISO
fi
if [ ! -f "$IMG" ]; then
  qemu-img create -f qcow2 $IMG 16G
fi
qemu-system-x86_64 \
  -enable-kvm \
  -M q35 \
  -smp 4 \
  -m 4G \
  -cpu host \
  -net nic,model=virtio \
  -net user,hostfwd=tcp::2222-:22 \
  -device virtio-vga-gl,hostmem=4G,blob=true,venus=true \
  -vga none \
  -display gtk,gl=on,show-cursor=on \
  -usb -device usb-tablet \
  -object memory-backend-memfd,id=mem1,size=4G \
  -machine memory-backend=mem1 \
  -hda $IMG \
  -cdrom $ISO