working passthrough support

systems/x86_64-linux/drivebystation-nix/hardware/graphics/passthrough_nvidia.nix

@@ -1,23 +1,37 @@
 { config, lib, system, pkgs, ... }:
 {
+  boot.kernelModules = [
+    "vfio"
+    "vfio-pci"
+    "vfio_iommu_type1"
+  ];
   boot.kernelParams = [
     "amd_iommu=on"
     "iommu=pt"
-    "vfio-pci.ids=10de:1b81,10de:10f0"
   ];
-  virtualisation.libvirtd = {
-    enable = true;
-    onBoot = "ignore";
-    onShutdown = "shutdown";
-    qemu.runAsRoot = true;
-    qemu.swtpm.enable = true;
-    qemu.package = pkgs.qemu_full;
-  };
+  # Make sure vfio is available inside initrd
+  boot.initrd.availableKernelModules = [
+    "vfio_pci"
+  ];
+  # Bind by IDs (cleaner via modprobe instead of kernel param)
+  boot.extraModprobeConfig = ''
+    options vfio-pci ids=10de:1b81,10de:10f0
+  '';
+  boot.initrd.preDeviceCommands = ''
+    modprobe vfio-pci
+  '';
+  # # EARLY and deterministic binding
+  # boot.initrd.preDeviceCommands = ''
+  #   echo 0000:05:00.0 > /sys/bus/pci/drivers/vfio-pci/bind
+  #   echo 0000:05:00.1 > /sys/bus/pci/drivers/vfio-pci/bind
+  # '';
   environment.systemPackages = with pkgs; [
+    pciutils
     virtiofsd
     config.virtualisation.libvirtd.qemu.package
     looking-glass-client
     virt-manager
     libguestfs-with-appliance
   ];
+  users.extraUsers.andreas.extraGroups = [ "libvirtd" ];
 }

systems/x86_64-linux/drivebystation-nix/hardware/hardware-configuration.nix

@@ -8,6 +8,7 @@
     [ 
       (modulesPath + "/installer/scan/not-detected.nix")
       ./graphics/intel.nix
+      ./graphics/passthrough_nvidia.nix
       # ./graphics/intel_i915.nix
       # ./graphics/nvidia.nix
       ./acer-monitor-edid.nix