[Boot/Packages/Kernel] Add kvdo kernel module

boot.nix

@@ -60,6 +60,7 @@ in
     x32abi = {
       enable = mkEnableOption "X32 kernel ABI";
     };
+    kvdo.enable = mkEnableOption "dm-kvdo kernel module";
     efi = mkOption rec {
       description = "Use EFI bootloader";
       default = builtins.pathExists "/sys/firmware/efi";
@@ -114,6 +115,9 @@ in
       kernelPatches = concatLists [
         (optional cfg.x32abi.enable customKernelPatches.enableX32ABI)
       ];
+      extraModulePackages = concatLists [
+        (optional cfg.kvdo.enable pkgs.kvdo)
+      ];
 
       loader.grub.enable = cfg.useGrub || (!cfg.efi);
       loader.grub = {

overlays.nix

@@ -127,6 +127,8 @@ in
         # chromium = self.ungoogled-chromium;
 
         myFirefox = (import ./packages/firefox.nix { pkgs = self; inherit lib; });
+
+        kvdo = config.boot.kernelPackages.callPackage ./packages/kvdo.nix { };
       })
     ];
 

packages/kvdo.nix

@@ -0,0 +1,53 @@
+{ stdenv, lib, fetchFromGitHub, kernel }:
+
+stdenv.mkDerivation rec {
+  pname = "kvdo";
+
+  _tag = "8.1.1.371";
+  version = "${_tag}-${kernel.version}";
+
+  src = fetchFromGitHub {
+    owner = "dm-vdo";
+    repo = "kvdo";
+    rev = "${_tag}";
+    sha256 = "sha256:1nwprbyql5vzhhgl2zmgnp5ax50ys7crgq8ff11zr8fhcna4fmmw";
+  };
+
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+
+  KERNEL_DIR = "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";
+
+  enableParallelBuilding = true;
+  dontConfigure = true;
+
+  MAKEFLAGS = with lib; concatStringsSep " " (
+    []
+      ++ optional enableParallelBuilding "-j$(nproc)"
+      ++ optional enableParallelBuilding "-l$(nproc)"
+  );
+
+  buildPhase = ''
+    BASE_DIR=$(pwd)
+    make -C ${KERNEL_DIR} M=$BASE_DIR/uds modules
+    make -C ${KERNEL_DIR} M=$BASE_DIR/vdo \
+      KBUILD_EXTRA_SYMBOLS=$BASE_DIR/uds/Module.symvers modules
+  '';
+
+  installPhase = ''
+    modDir=$out/lib/modules/${kernel.modDirVersion}/kernel/drivers/block/
+    mkdir -p $modDir
+    for d in uds vdo; do
+      mv -v $d/*.ko $modDir/
+    done
+  '';
+
+  hardeningDisable = [ "pic" ];
+
+  meta = with lib; {
+    description = "A pair of kernel modules which provide pools of deduplicated and/or compressed block storage";
+    homepage = "https://github.com/dm-vdo/kvdo";
+    license = licenses.gpl2Only;
+    # maintainers = [ maintainers.makefu ];
+    platforms = platforms.linux;
+  };
+}