nixpkgs/nixos/modules/profiles/qemu-guest.nix

# Common configuration for virtual machines running under QEMU (using
# virtio).

{ ... }:

{
  boot.initrd.availableKernelModules = [ "virtio_net" "virtio_pci" "virtio_mmio" "virtio_blk" "virtio_scsi" "9p" "9pnet_virtio" ];
  boot.initrd.kernelModules = [ "virtio_balloon" "virtio_console" "virtio_rng" ];

  boot.initrd.postDeviceCommands =
    ''
      # Set the system time from the hardware clock to work around a
      # bug in qemu-kvm > 1.5.2 (where the VM clock is initialised
      # to the *boot time* of the host).
      hwclock -s
    '';

  security.rngd.enable = false;
}