WiP! nixos-host

nixos-modules/nixos-host.nix

@@ -6,22 +6,29 @@
 
 {
   options.genodeGuests = with lib;
+    with lib.types;
     let
       genodeOpts = { ... }: {
         options = {
 
           name = mkOption {
             example = "webserver";
-            type = types.str;
+            type = str;
             description = "Name of the Genode subsystem.";
           };
 
           config = mkOption {
-            type = types.str;
+            type = oneOf [ str path ];
-            default = "<config/>";
+            example = ''
+              let Genode = env:DHALL_GENODE
+
+              in Genode.Init::{=}
+            '';
             description = ''
-              Configuration of the Genode subsystem.
+              Configuration of the Genode subsystem in Dhall.
-              Must be rendered in the Genode XML format.
+              The type of the expression must be <literal>Genode.Init.Type<literal>,
+              where the <literal>Genode<literal> is library available at
+              <literal>env:DHALL_GENODE<literal>.
             '';
           };
 
@@ -39,15 +46,24 @@
             '';
           };
 
+          nics = mkOption {
+            type = with types; listOf str;
+            default = [ ];
+            example = [ "tap0" "tap1" ];
+            description = ''
+              TAP interfaces to pass from NixOS into the Genode guest.
+            '';
+          };
+
         };
       };
 
     in mkOption {
-      type = with lib.types; loaOf (submodule genodeOpts);
+      type = loaOf (submodule genodeOpts);
       default = { };
       example = {
         foobar = {
-          config = "<empty/>";
+          config = "…";
           rom = pkgs: { };
         };
       };
@@ -64,25 +80,38 @@
       inherit (crossPkgs.genodePackages) base-linux;
       toService = name: cfg: {
         description = "Genode subsystem";
+        after = [ "network.target" ];
         wantedBy = [ "multi-user.target" ];
 
         preStart = let
+          config' =
+            self.lib.${crossSystem}.runDhallCommand "${name}.config" { } ''
+              set -e
+              exec ${self.apps.${crossSystem}.render-init.program} > $out << EOF
+              ${./root-config.dhall}
+                { guest = ${cfg.config}
+                , nics = [ "${builtins.concatStringsSep ''", "'' cfg.nics}" ]
+                }
+              EOF
+            '';
           rom' = with crossPkgs.genodePackages;
             {
-              core = "${base-linux}/bin/core-linux";
+              init = "${init}/init";
-              init = "${init}/bin/init";
+              "ld.lib.so" = "${base-linux}/lib/ld.lib.so";
-              "ld.lib.so" = "${base-linux}/bin/ld.lib.so";
+              timer_drv = "${base-linux}/timer_drv";
-              timer = "${base-linux}/bin/linux_timer_drv";
+              config = config';
-              config = builtins.toFile "${name}.config.xml" cfg.config;
+              linux_nic_drv = "${
+                  crossPkgs.genodeSources.depot "linux_nic_drv"
+                }/linux_nic_drv";
             } // (cfg.rom crossPkgs);
         in builtins.concatStringsSep "\n"
-        (lib.mapAttrsToList (name: value: "ln -s ${value} ${name}") rom');
+        (lib.mapAttrsToList (name: value: "ln -sv ${value} ${name}") rom');
 
         serviceConfig = {
           DynamicUser = true;
           RuntimeDirectory = "genode/" + name;
           WorkingDirectory = "/run/genode/" + name;
-          ExecStart = "${base-linux}/bin/core-linux";
+          ExecStart = "${base-linux}/core-linux";
         };
       };
     in lib.mapAttrs toService config.genodeGuests;

nixos-modules/root-config.dhall

@@ -0,0 +1,70 @@
+let Genode = env:DHALL_GENODE
+
+let Prelude = Genode.Prelude
+
+let Init = Genode.Init
+
+let Child = Init.Child
+
+let nicChild
+    : Text → Init.Children.Entry
+    =   λ(tapDevice : Text)
+      → { mapKey = tapDevice
+        , mapValue =
+            Child.flat
+              Child.Attributes::{
+              , binary = "linux_nic_drv"
+              , config = Init.Config::{ attributes = toMap { tap = tapDevice } }
+              , ld = False
+              , resources = Init.Resources::{
+                , caps = 256
+                , ram = Genode.units.MiB 4
+                }
+              , provides = [ "Nic" ]
+              }
+        }
+
+let nicChildren = Prelude.List.map Text Init.Children.Entry nicChild
+
+let init =
+        λ(params : { guest : Init.Type, nics : List Text })
+      → Init::{
+        , routes = [ Init.ServiceRoute.child "Timer" "timer_drv" ]
+        , children =
+              nicChildren params.nics
+            # toMap
+                { timer_drv =
+                    Child.flat
+                      Child.Attributes::{
+                      , binary = "timer_drv"
+                      , provides = [ "Timer" ]
+                      }
+                , init =
+                    Init.toChild
+                      params.guest
+                      Init.Attributes::{
+                      , exitPropagate = True
+                      , routes =
+                          Prelude.List.map
+                            Text
+                            Init.ServiceRoute.Type
+                            (   λ(tapDevice : Text)
+                              → { service =
+                                    { name = "Nic"
+                                    , label = Init.LabelSelector.last tapDevice
+                                    }
+                                , route =
+                                    Init.Route.Type.Child
+                                      { name = tapDevice
+                                      , label = None Text
+                                      , diag = None Bool
+                                      }
+                                }
+                            )
+                            params.nics
+                      }
+                }
+        , verbose = True
+        }
+
+in  init

tests/nixos-host.nix

@@ -6,45 +6,80 @@ import "${self.inputs.nixpkgs}/nixos/tests/make-test-python.nix"
   # meta.maintainers = [ pkgs.lib.maintainers.ehmry ];
 
   machine = {
+
     imports = [
       self.nixosModules.genodeGuests
       "${self.inputs.nixpkgs}/nixos/modules/profiles/minimal.nix"
     ];
-    genodeGuests.signal-test = {
+
+    networking.bridges.br0.interfaces = [ "eth0" "tap0" ];
+
+    networking.interfaces.eth0.useDHCP = false;
+
+    networking.interfaces.tap0 = {
+      useDHCP = false;
+      virtual = true;
+      virtualType = "tap";
+    };
+
+    genodeGuests.tap-test = {
       config = ''
-        <config>
+        let Genode = env:DHALL_GENODE
-        	<parent-provides>
+
-        		<service name="ROM"/>
+        let Prelude = Genode.Prelude
-        		<service name="CPU"/>
+
-        		<service name="RM"/>
+        let XML = Prelude.XML
-        		<service name="PD"/>
+
-        		<service name="LOG"/>
+        let Init = Genode.Init
-        	</parent-provides>
+
-        	<default-route>
+        in  Init::{
-        		<any-service> <parent/> <any-child/> </any-service>
+            , children = toMap
-        	</default-route>
+                { lwip_fs =
-        	<default caps="100"/>
+                    Init.Child.flat
-        	<start name="timer" caps="96">
+                      Init.Child.Attributes::{
-        		<resource name="RAM" quantum="1M"/>
+                      , binary = "vfs"
-        		<provides><service name="Timer"/></provides>
+                      , config = Init.Config::{
-        	</start>
+                        , content =
-        	<start name="test-signal" caps="500">
+                          [ XML.element
-        		<resource name="RAM" quantum="10M"/>
+                              { name = "vfs"
-        	</start>
+                              , attributes = XML.emptyAttributes
-        </config>
+                              , content =
+                                [ XML.leaf
+                                    { name = "lwip"
+                                    , attributes = toMap { dhcp = "yes" }
+                                    }
+                                ]
+                              }
+                          ]
+                        }
+                      , provides = [ "File_system" ]
+                      , resources = Init.Resources::{
+                        , caps = 256
+                        , ram = Genode.units.MiB 8
+                        }
+                      , routes =
+                        [ Init.ServiceRoute.parentLabel "Nic" (None Text) (Some "tap0")
+                        , Init.ServiceRoute.parent "Timer"
+                        ]
+                      }
+                }
+            , verbose = True
+            }
       '';
+      nics = [ "tap0" ];
       rom = pkgs: {
-        "test-signal" =
+        "vfs" = "${pkgs.genodeSources.depot "vfs"}/vfs";
-          "${pkgs.genodeSources.depot "test-signal"}/bin/test-signal";
+        "libvfs.so" = "${(pkgs.genodeSources.depot "vfs").lib}/lib/libvfs.so";
+        "libvfs_lwip.so" =
+          "${pkgs.genodeSources.depot "vfs_lwip"}/lib/libvfs_lwip.so";
       };
     };
+
   };
 
   testScript = ''
     start_all()
-    machine.wait_for_unit("genode")
+    machine.wait_for_unit("tap-test")
     machine.wait_for_open_port("1965")
   '';
-}) {
+}) { system = localSystem; }
-  system = localSystem;
-}