[microvm] split module files

machines/modules/malobeo/microvm_host.nix

@@ -0,0 +1,52 @@
+{ config, lib, options, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.malobeo.microvm;
+in
+{
+  options = {
+    services.malobeo.microvm = {
+      enableHostBridge = mkOption {
+        default = false;
+        type = types.bool;
+        description = lib.mdDoc "Setup bridge device for microvms.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enableHostBridge
+  { 
+    systemd.network = {
+      enable = true;
+      # create a bride device that all the microvms will be connected to
+      netdevs."10-microvm".netdevConfig = {
+        Kind = "bridge";
+        Name = "microvm";
+      };
+
+      networks."10-microvm" = {
+        matchConfig.Name = "microvm";
+        networkConfig = {
+          DHCPServer = true;
+          IPv6SendRA = true;
+        };
+        addresses = [ {
+          Address = "10.0.0.1/24";
+        } {
+          Address = "fd12:3456:789a::1/64";
+        } ];
+        ipv6Prefixes = [ {
+          Prefix = "fd12:3456:789a::/64";
+        } ];
+      };
+
+      # connect the vms to the bridge
+      networks."11-microvm" = {
+        matchConfig.Name = "vm-*";
+        networkConfig.Bridge = "microvm";
+      };
+    };
+  };
+}