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

{
  imports = [
    <nixpkgs/nixos/modules/profiles/qemu-guest.nix>
  ];

  networking.hostName = "xen-testing";
  system.stateVersion = "19.09";

  virtualisation.xen = {
    enable = true;
    package = pkgs.xenPackages.xen_4_10-light;
    package-qemu = pkgs.qemu_xen_4_10-light;
    domain0MemorySize = 0;

    bootParams = [
      "noreboot" "console=com1,vga" "com1=115200,8n1"
    ];

    trace = true;
  };

  boot.kernelParams = [
    "console=hvc0" "loglevel=8" "initcall_debug"
  ];

  boot.loader = {
    efi.canTouchEfiVariables = true;
    timeout = 3;
    grub = {
      enable = true;
      device = "nodev";
      efiSupport = true;
      extraConfig = ''
        serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1
      '';
    };
  };

  boot.initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "ehci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
  boot.kernelModules = [ "kvm-amd" ];
  boot.extraModulePackages = [ ];

  fileSystems."/" =
    { label = "xen-root";
      fsType = "ext4";
    };

  fileSystems."/boot" =
    { label = "xen-sys";
      fsType = "vfat";
    };

  swapDevices =
    [ { label = "xen-swap"; }
    ];

  nix.maxJobs = lib.mkDefault 2;
}