From 85e507ebeaa1958d04335c38ded126093a1fb409 Mon Sep 17 00:00:00 2001
From: Peter Hoeg <peter@hoeg.com>
Date: Fri, 7 Apr 2017 17:40:17 +0800
Subject: [PATCH] hyperv-daemons: add nixos module

---
 nixos/modules/module-list.nix                 |  1 +
 nixos/modules/virtualisation/hyperv-guest.nix | 37 +++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 nixos/modules/virtualisation/hyperv-guest.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index f32fb50368e3..93ba90bdc5d8 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -746,6 +746,7 @@
   ./virtualisation/lxcfs.nix
   ./virtualisation/lxd.nix
   ./virtualisation/amazon-options.nix
+  ./virtualisation/hyperv-guest.nix
   ./virtualisation/openvswitch.nix
   ./virtualisation/parallels-guest.nix
   ./virtualisation/rkt.nix
diff --git a/nixos/modules/virtualisation/hyperv-guest.nix b/nixos/modules/virtualisation/hyperv-guest.nix
new file mode 100644
index 000000000000..ecd2a8117710
--- /dev/null
+++ b/nixos/modules/virtualisation/hyperv-guest.nix
@@ -0,0 +1,37 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.virtualisation.hypervGuest;
+
+in {
+  options = {
+    virtualisation.hypervGuest = {
+      enable = mkEnableOption "Hyper-V Guest Support";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ config.boot.kernelPackages.hyperv-daemons.bin ];
+
+    security.rngd.enable = false;
+
+    # enable hotadding memory
+    services.udev.packages = lib.singleton (pkgs.writeTextFile {
+      name = "hyperv-memory-hotadd-udev-rules";
+      destination = "/etc/udev/rules.d/99-hyperv-memory-hotadd.rules";
+      text = ''
+        ACTION="add", SUBSYSTEM=="memory", ATTR{state}="online"
+      '';
+    });
+
+    systemd = {
+      packages = [ config.boot.kernelPackages.hyperv-daemons.lib ];
+
+      targets.hyperv-daemons = {
+        wantedBy = [ "multi-user.target" ];
+      };
+    };
+  };
+}