{ config, lib, pkgs, modulesPath, ... }:

# Contains the configuration to make a VM bootable with qemu.

{
  imports = [
    "${modulesPath}/virtualisation/qemu-vm.nix"
  ];

  boot = {
    kernelParams = [ "boot.shell_on_fail" ];
    #kernelPackages = lib.mkForce pkgs.linuxPackagesCustom;
    consoleLogLevel = lib.mkDefault 7;
    initrd.kernelModules = [
      "virtio_pci"
      "virtio_blk"
      "virtio_input"
      "9pnet"
      "9pnet_virtio"
    ];

    kernelPatches = [ {
      name = "qemu";
      patch = null;
      extraConfig = ''
        # For qemu
        BLOCK y
        BLK_DEV y
        DEVTMPFS y
        VIRTIO_MENU y
        VIRTIO_BLK y
        VIRTIO_NET y
        EXT4_FS y

        # For 9P: https://wiki.qemu.org/Documentation/9psetup
        NET_9P y
        NET_9P_VIRTIO y
        NET_9P_DEBUG y
        NET_DEVICES y
        NET_CORE y
        INET y
        NETWORK_FILESYSTEMS y
        OVERLAY_FS y
        "9P_FS" y
        "9P_FS_POSIX_ACL" y
        PCI y
        VIRTIO_PCI y
        PCI_HOST_GENERIC y
      '';
    } ];

    loader = {
      grub.enable = false;
      generic-extlinux-compatible.enable = true;
    };
  };
}