From b893b67028c00760bd0a5586eaa3183660f89dc2 Mon Sep 17 00:00:00 2001
From: Lorenz Leutgeb <lorenz@leutgeb.xyz>
Date: Mon, 16 Oct 2023 21:33:22 +0200
Subject: [PATCH] nixos/throttled: Use `hardware.cpu.x86.msr`

---
 nixos/modules/services/hardware/throttled.nix | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/nixos/modules/services/hardware/throttled.nix b/nixos/modules/services/hardware/throttled.nix
index afca24d976e1..9fa495886119 100644
--- a/nixos/modules/services/hardware/throttled.nix
+++ b/nixos/modules/services/hardware/throttled.nix
@@ -29,8 +29,7 @@ in {
 
     # Kernel 5.9 spams warnings whenever userspace writes to CPU MSRs.
     # See https://github.com/erpalma/throttled/issues/215
-    boot.kernelParams =
-      optional (versionAtLeast config.boot.kernelPackages.kernel.version "5.9")
-      "msr.allow_writes=on";
+    hardware.cpu.x86.msr.settings.allow-writes =
+      mkIf (versionAtLeast config.boot.kernelPackages.kernel.version "5.9") "on";
   };
 }