From bc693cf4b9083d97d49f4b398fe454e177ab6776 Mon Sep 17 00:00:00 2001
From: Maximilian Bosch <maximilian@mbosch.me>
Date: Wed, 22 Oct 2025 13:21:03 +0200
Subject: [PATCH] linux/common-config: only enable VFIO opts for 6.6 and later

For older kernels (<=6.1) I get

    error: unused option: VFIO_DEVICE_CDEV

while building `linux-config`.
---
 pkgs/os-specific/linux/kernel/common-config.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 03a8b930bc92..4fa16a094bdc 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -1003,8 +1003,8 @@ let
 
       # Enable CDEV and NOIOMMU support for VFIO, which is useful for
       # passthrough.
-      VFIO_DEVICE_CDEV = yes;
-      VFIO_NOIOMMU = yes;
+      VFIO_DEVICE_CDEV = whenAtLeast "6.6" yes;
+      VFIO_NOIOMMU = whenAtLeast "6.6" yes;
     };
 
     media = {