From 2b80993ef7e78a3553ee960489e5836dd6827a8e Mon Sep 17 00:00:00 2001
From: Alex Mickelson <alexmickelson96@gmail.com>
Date: Sat, 15 Feb 2025 10:41:27 -0700
Subject: [PATCH] pci passthrough

---
 nix/home-server.nix             |  1 +
 nix/modules/pci-passthrough.nix | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 nix/modules/pci-passthrough.nix

diff --git a/nix/home-server.nix b/nix/home-server.nix
index 565e170..128262a 100644
--- a/nix/home-server.nix
+++ b/nix/home-server.nix
@@ -6,6 +6,7 @@
     [
       <home-manager/nixos>
       ./modules/k3s.nix
+      ./modules/pci-passthrough.nix
     ];
 
   # Bootloader.
diff --git a/nix/modules/pci-passthrough.nix b/nix/modules/pci-passthrough.nix
new file mode 100644
index 0000000..f1de1a2
--- /dev/null
+++ b/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);
+  };
+}
\ No newline at end of file