boot.kernelPatches

A list of additional patches to apply to the kernel.

Every item should be an attribute set with the following attributes:

{
  name = "foo";                 # descriptive name, required

  patch = ./foo.patch;          # path or derivation that contains the patch source
                                # (required, but can be null if only config changes
                                # are needed)

  extraStructuredConfig = {     # attrset of extra configuration parameters without the CONFIG_ prefix
    FOO = lib.kernel.yes;       # (optional)
  };                            # values should generally be lib.kernel.yes,
                                # lib.kernel.no or lib.kernel.module

  features = {                  # attrset of extra "features" the kernel is considered to have
    foo = true;                 # (may be checked by other NixOS modules, optional)
  };

  extraConfig = "FOO y";        # extra configuration options in string form without the CONFIG_ prefix
                                # (optional, multiple lines allowed to specify multiple options)
                                # (deprecated, use extraStructuredConfig instead)
}

There's a small set of existing kernel patches in Nixpkgs, available as pkgs.kernelPatches, that follow this format and can be used directly.