CDI: Add mount-nvidia-binaries and mount-nvidia-docker-1-directories options

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -42,9 +42,7 @@ Use `services.pipewire.extraConfig` or `services.pipewire.configPackages` for Pi
 
 - The default dbus implementation has transitioned to dbus-broker from the classic dbus daemon for better performance and reliability. Users can revert to the classic dbus daemon by setting `services.dbus.implementation = "dbus";`. For detailed deviations, refer to [dbus-broker's deviations page](https://github.com/bus1/dbus-broker/wiki/Deviations).
 
-- A new option `virtualisation.containers.cdi` was added. It contains `static` and `dynamic` attributes (corresponding to `/etc/cdi` and `/run/cdi` respectively) to configure the Container Device Interface (CDI).
-
-- `virtualisation.docker.enableNvidia` and `virtualisation.podman.enableNvidia` options are deprecated. `virtualisation.containers.cdi.dynamic.nvidia.enable` should be used instead. This option will expose GPUs on containers with the `--device` CLI option. This is supported by Docker 25, Podman 3.2.0 and Singularity 4. Any container runtime that supports the CDI specification will take advantage of this feature.
+- `virtualisation.docker.enableNvidia` and `virtualisation.podman.enableNvidia` options are deprecated. `hardware.nvidia-container-toolkit.enable` should be used instead. This option will expose GPUs on containers with the `--device` CLI option. This is supported by Docker 25, Podman 3.2.0 and Singularity 4. Any container runtime that supports the CDI specification will take advantage of this feature.
 
 - A new option `system.etc.overlay.enable` was added. If enabled, `/etc` is
   mounted via an overlayfs instead of being created by a custom perl script.

nixos/modules/module-list.nix

@@ -557,7 +557,7 @@
   ./services/hardware/kanata.nix
   ./services/hardware/lcd.nix
   ./services/hardware/lirc.nix
-  ./services/hardware/nvidia-container-toolkit-cdi-generator
+  ./services/hardware/nvidia-container-toolkit
   ./services/hardware/monado.nix
   ./services/hardware/nvidia-optimus.nix
   ./services/hardware/openrgb.nix

nixos/modules/services/hardware/nvidia-container-toolkit/cdi-generate.nix

@@ -0,0 +1,35 @@
+{
+  glibc,
+  jq,
+  lib,
+  mounts,
+  nvidia-container-toolkit,
+  nvidia-driver,
+  runtimeShell,
+  writeScriptBin,
+}: let
+  mkMount = {hostPath, containerPath, mountOptions}: {
+    inherit hostPath containerPath;
+    options = mountOptions;
+  };
+  jqAddMountExpression = ".containerEdits.mounts[.containerEdits.mounts | length] |= . +";
+  allJqMounts = lib.concatMap
+    (mount:
+      ["${lib.getExe jq} '${jqAddMountExpression} ${builtins.toJSON (mkMount mount)}'"])
+    mounts;
+in
+writeScriptBin "nvidia-cdi-generator"
+''
+#! ${runtimeShell}
+
+function cdiGenerate {
+  ${lib.getExe' nvidia-container-toolkit "nvidia-ctk"} cdi generate \
+    --format json \
+    --ldconfig-path ${lib.getExe' glibc "ldconfig"} \
+    --library-search-path ${lib.getLib nvidia-driver}/lib \
+    --nvidia-ctk-path ${lib.getExe' nvidia-container-toolkit "nvidia-ctk"}
+}
+
+cdiGenerate | \
+  ${lib.concatStringsSep " | " allJqMounts} > $RUNTIME_DIRECTORY/nvidia-container-toolkit.json
+''

nixos/modules/services/hardware/nvidia-container-toolkit/default.nix

@@ -0,0 +1,121 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    (lib.mkRenamedOptionModule
+      [ "virtualisation" "containers" "cdi" "dynamic" "nvidia" "enable" ]
+      [ "hardware" "nvidia-container-toolkit" "enable" ])
+  ];
+
+  options = let
+    mountType = {
+      options = {
+        hostPath = lib.mkOption {
+          type = lib.types.str;
+          description = "Host path.";
+        };
+        containerPath = lib.mkOption {
+          type = lib.types.str;
+          description = "Container path.";
+        };
+        mountOptions = lib.mkOption {
+          default = [ "ro" "nosuid" "nodev" "bind" ];
+          type = lib.types.listOf lib.types.str;
+          description = "Mount options.";
+        };
+      };
+    };
+  in {
+
+    hardware.nvidia-container-toolkit = {
+      enable = lib.mkOption {
+        default = false;
+        type = lib.types.bool;
+        description = ''
+          Enable dynamic CDI configuration for NVidia devices by running
+          nvidia-container-toolkit on boot.
+        '';
+      };
+
+      mounts = lib.mkOption {
+        type = lib.types.listOf (lib.types.submodule mountType);
+        default = [];
+        description = "Mounts to be added to every container under the Nvidia CDI profile.";
+      };
+
+      mount-nvidia-executables = lib.mkOption {
+        default = true;
+        type = lib.types.bool;
+        description = ''
+          Mount executables nvidia-smi, nvidia-cuda-mps-control, nvidia-cuda-mps-server,
+          nvidia-debugdump, nvidia-powerd and nvidia-ctk on containers.
+        '';
+      };
+
+      mount-nvidia-docker-1-directories = lib.mkOption {
+        default = true;
+        type = lib.types.bool;
+        description = ''
+          Mount nvidia-docker-1 directories on containers: /usr/local/nvidia/lib and
+          /usr/local/nvidia/lib64.
+        '';
+      };
+    };
+
+  };
+
+  config = {
+
+    hardware.nvidia-container-toolkit.mounts = let
+      nvidia-driver = config.hardware.nvidia.package;
+    in (lib.mkMerge [
+      [{ hostPath = pkgs.addDriverRunpath.driverLink;
+         containerPath = pkgs.addDriverRunpath.driverLink; }
+       { hostPath = "${lib.getLib pkgs.glibc}/lib";
+         containerPath = "${lib.getLib pkgs.glibc}/lib"; }
+       { hostPath = "${lib.getLib pkgs.glibc}/lib64";
+         containerPath = "${lib.getLib pkgs.glibc}/lib64"; }]
+      (lib.mkIf config.hardware.nvidia-container-toolkit.mount-nvidia-executables
+        [{ hostPath = lib.getExe' nvidia-driver "nvidia-cuda-mps-control";
+           containerPath = "/usr/bin/nvidia-cuda-mps-control"; }
+         { hostPath = lib.getExe' nvidia-driver "nvidia-cuda-mps-server";
+           containerPath = "/usr/bin/nvidia-cuda-mps-server"; }
+         { hostPath = lib.getExe' nvidia-driver "nvidia-debugdump";
+           containerPath = "/usr/bin/nvidia-debugdump"; }
+         { hostPath = lib.getExe' nvidia-driver "nvidia-powerd";
+           containerPath = "/usr/bin/nvidia-powerd"; }
+         { hostPath = lib.getExe' nvidia-driver "nvidia-smi";
+           containerPath = "/usr/bin/nvidia-smi"; }])
+      # nvidia-docker 1.0 uses /usr/local/nvidia/lib{,64}
+      #   e.g.
+      #     - https://gitlab.com/nvidia/container-images/cuda/-/blob/e3ff10eab3a1424fe394899df0e0f8ca5a410f0f/dist/12.3.1/ubi9/base/Dockerfile#L44
+      #     - https://github.com/NVIDIA/nvidia-docker/blob/01d2c9436620d7dde4672e414698afe6da4a282f/src/nvidia/volumes.go#L104-L173
+      (lib.mkIf config.hardware.nvidia-container-toolkit.mount-nvidia-docker-1-directories
+        [{ hostPath = "${lib.getLib nvidia-driver}/lib";
+           containerPath = "/usr/local/nvidia/lib"; }
+         { hostPath = "${lib.getLib nvidia-driver}/lib";
+           containerPath = "/usr/local/nvidia/lib64"; }])
+    ]);
+
+    systemd.services.nvidia-container-toolkit-cdi-generator = lib.mkIf config.hardware.nvidia-container-toolkit.enable {
+      description = "Container Device Interface (CDI) for Nvidia generator";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "systemd-udev-settle.service" ];
+      serviceConfig = {
+        RuntimeDirectory = "cdi";
+        RemainAfterExit = true;
+        ExecStart =
+          let
+            script = pkgs.callPackage ./cdi-generate.nix {
+              inherit (config.hardware.nvidia-container-toolkit) mounts;
+              nvidia-driver = config.hardware.nvidia.package;
+            };
+          in
+          lib.getExe script;
+        Type = "oneshot";
+      };
+    };
+
+  };
+
+}

nixos/modules/virtualisation/containers.nix

@@ -28,43 +28,6 @@ in
       description = "Enable the OCI seccomp BPF hook";
     };
 
-    cdi = {
-      dynamic.nvidia.enable = mkOption {
-        type = types.bool;
-        default = false;
-        description = ''
-          Enable dynamic CDI configuration for NVidia devices by running nvidia-container-toolkit on boot.
-        '';
-      };
-
-      static = mkOption {
-        type = types.attrs;
-        default = { };
-        description = ''
-          Declarative CDI specification. Each key of the attribute set
-          will be mapped to a file in /etc/cdi. It is required for every
-          key to be provided in JSON format.
-        '';
-        example = {
-          some-vendor = builtins.fromJSON ''
-              {
-                "cdiVersion": "0.5.0",
-                "kind": "some-vendor.com/foo",
-                "devices": [],
-                "containerEdits": []
-              }
-            '';
-
-          some-other-vendor = {
-            cdiVersion = "0.5.0";
-            kind = "some-other-vendor.com/bar";
-            devices = [];
-            containerEdits = [];
-          };
-        };
-      };
-    };
-
     containersConf.settings = mkOption {
       type = toml.type;
       default = { };
@@ -150,8 +113,6 @@ in
 
   config = lib.mkIf cfg.enable {
 
-    hardware.nvidia-container-toolkit-cdi-generator.enable = lib.mkIf cfg.cdi.dynamic.nvidia.enable true;
-
     virtualisation.containers.containersConf.cniPlugins = [ pkgs.cni-plugins ];
 
     virtualisation.containers.containersConf.settings = {
@@ -163,13 +124,7 @@ in
       };
     };
 
-    environment.etc = let
-      cdiStaticConfigurationFiles = (lib.attrsets.mapAttrs'
-        (name: value:
-          lib.attrsets.nameValuePair "cdi/${name}.json"
-            { text = builtins.toJSON value; })
-        cfg.cdi.static);
-    in {
+    environment.etc = {
       "containers/containers.conf".source =
         toml.generate "containers.conf" cfg.containersConf.settings;
 
@@ -183,7 +138,7 @@ in
       "containers/policy.json".source =
         if cfg.policy != { } then pkgs.writeText "policy.json" (builtins.toJSON cfg.policy)
         else "${pkgs.skopeo.policy}/default-policy.json";
-    } // cdiStaticConfigurationFiles;
+    };
 
   };