VFIO - GPU Passthrough and looking-glass

hosts/common/services/default.nix

@@ -1,6 +1,7 @@
 {
   imports = [
     ./vm.nix
+    ./vfio.nix
     ./steam.nix
     ./polkit.nix
     ./appimage.nix

hosts/common/services/vfio.nix

@@ -0,0 +1,51 @@
+{ config
+, lib
+, pkgs
+, ...
+}:
+with lib; let
+  cfg = config.common.services.appimage;
+in
+{
+  options.common.services.vfio.enable = mkEnableOption "enable GPU Passthrough with looking-glass";
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = with pkgs; [
+      looking-glass-client
+      scream
+    ];
+
+    boot.initrd.availableKernelModules = [ "vfio-pci" "nvidia" ];
+    boot.initrd.preDeviceCommands = ''
+      DEVS="0000:01:00.0" # Set your GPU here
+      for DEV in $DEVS; do
+        echo "vfio-pci" > /sys/bus/pci/devices/$DEV/driver_override
+          done
+          modprobe -i vfio-pci
+    '';
+
+    boot.kernelPackages = pkgs.linuxPackages_latest;
+    boot.kernelParams = [ "intel_iommu=on" "pcie_aspm=off" ];
+    boot.kernelModules = [ "kvm-intel" ]; #kvm-amd if AMD
+    boot.blacklistedKernelModules = [ "nouveau" "nvidia" "nvidiafb" "nvidia_drm" ];
+
+
+
+    systemd.tmpfiles.rules = [
+      "f /dev/shm/scream 0660 nomad qemu-libvirtd -" # your username
+      "f /dev/shm/looking-glass 0660 nomad qemu-libvirtd -" # your username
+    ];
+
+    systemd.user.services.scream-ivshmem = {
+      enable = true;
+      description = "Scream IVSHMEM";
+      serviceConfig = {
+        ExecStart = "${pkgs.scream}/bin/scream-ivshmem-pulse /dev/shm/scream";
+        Restart = "always";
+      };
+      wantedBy = [ "multi-user.target" ];
+      requires = [ "pulseaudio.service" ];
+    };
+  };
+}

hosts/common/services/vm.nix

@@ -24,6 +24,7 @@ in
       win-virtio
       win-spice
       adwaita-icon-theme
+      virtiofsd
       #bridge-utils
     ];
 

hosts/unkown/configuration.nix

@@ -17,8 +17,9 @@
   common.services.xdgportal.enable = true;
   # Filemanager
   common.services.nautilus.enable = true;
-  # Virtual Box (Virt-Manager)
-  common.services.vm.enable = false;
+  # Virtual Box (Virt-Manager) and GPU Passthru. you have to configure hosts/services/vfio.nix for passthrough to work!
+  common.services.vm.enable = true;
+  common.services.vfio.enable = false;
   # AppStores
   common.services.appimage.enable = true;
   common.services.steam.enable = true;

hosts/unkown/hardware-configuration.nix

@@ -10,7 +10,7 @@
     ];
 
   boot.initrd.availableKernelModules = [ "xhci_pci" "thunderbolt" "nvme" ];
-  boot.initrd.kernelModules = [ ];
+  boot.initrd.kernelModules = [ "nvidia" ];
   boot.kernelModules = [ "kvm-intel" ];
   boot.extraModulePackages = [ ];