From 343b34b4dc8e2be842ca0ab20bba90b1f9e68451 Mon Sep 17 00:00:00 2001
From: Jake Hillion <jake@hillion.co.uk>
Date: Fri, 30 Aug 2024 15:45:17 +0100
Subject: [PATCH] boron: support sched_ext in kernel

---
 hosts/boron.cx.ts.hillion.co.uk/default.nix | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/hosts/boron.cx.ts.hillion.co.uk/default.nix b/hosts/boron.cx.ts.hillion.co.uk/default.nix
index 95baa71..81c1232 100644
--- a/hosts/boron.cx.ts.hillion.co.uk/default.nix
+++ b/hosts/boron.cx.ts.hillion.co.uk/default.nix
@@ -35,6 +35,25 @@
     ### kernels available in NixOS do not seem to support this server's very
     ### modern hardware.
     boot.kernelPackages = pkgs.linuxPackages_6_10;
+    ### Apply patch to enable sched_ext which isn't yet available upstream.
+    boot.kernelPatches = [{
+      name = "sched_ext";
+      patch = pkgs.fetchpatch {
+        url = "https://github.com/sched-ext/scx-kernel-releases/releases/download/v6.10.3-scx1/linux-v6.10.3-scx1.patch.zst";
+        hash = "sha256-c4UlXsVOHGe0gvL69K9qTMWqCR8as25qwhfNVxCXUTs=";
+        decode = "${pkgs.zstd}/bin/unzstd";
+        excludes = [ "Makefile" ];
+      };
+      extraConfig = ''
+        BPF y
+        BPF_EVENTS y
+        BPF_JIT y
+        BPF_SYSCALL y
+        DEBUG_INFO_BTF y
+        FTRACE y
+        SCHED_CLASS_EXT y
+      '';
+    }];
 
     ## Enable btrfs compression
     fileSystems."/data".options = [ "compress=zstd" ];