pci passthrough

nix/home-server.nix

@@ -6,6 +6,7 @@
     [
       <home-manager/nixos>
       ./modules/k3s.nix
+      ./modules/pci-passthrough.nix
     ];
 
   # Bootloader.

nix/modules/pci-passthrough.nix

@@ -0,0 +1,26 @@
+let 
+  gpuIDs = [
+    "10de:2704" # Graphics
+    "10de:22bb" # Audio
+  ];
+in { pkgs, lib, config, ... }: {
+  boot = {
+    initrd.kernelModules = [
+      "vfio_pci"
+      "vfio"
+      "vfio_iommu_type1"
+      "vfio_virqfd"
+
+      # "nvidia"
+      # "nvidia_modeset"
+      # "nvidia_uvm"
+      # "nvidia_drm"
+    ];
+
+    kernelParams = [
+      "intel_iommu=on"
+    ] ++ lib.optional cfg.enable
+      # isolate the GPU
+      ("vfio-pci.ids=" + lib.concatStringsSep "," gpuIDs);
+  };
+}