# WARNING/NOTE: whenever you want to add an option here you need to either
# * mark it as an optional one with `option`,
# * or make sure it works for all the versions in nixpkgs,
# * or check for which kernel versions it will work (using kernel
# changelog, google or whatever) and mark it with `whenOlder` or
# `whenAtLeast`.
# Then do test your change by building all the kernels (or at least
# their configs) in Nixpkgs or else you will guarantee lots and lots
# of pain to users trying to switch to an older kernel because of some
# hardware problems with a new one.
# Configuration
{ lib, stdenv, version
, features ? {}
}:
with lib;
with lib.kernel;
with (lib.kernel.whenHelpers version);
let
# configuration items have to be part of a subattrs
flattenKConf = nested: mapAttrs (_: head) (zipAttrs (attrValues nested));
whenPlatformHasEBPFJit =
mkIf (stdenv.hostPlatform.isAarch32 ||
stdenv.hostPlatform.isAarch64 ||
stdenv.hostPlatform.isx86_64 ||
(stdenv.hostPlatform.isPowerPC && stdenv.hostPlatform.is64bit) ||
(stdenv.hostPlatform.isMips && stdenv.hostPlatform.is64bit));
options = {
debug = {
DEBUG_INFO = if (features.debug or false) then yes else no;
DEBUG_KERNEL = yes;
DEBUG_DEVRES = no;
DYNAMIC_DEBUG = yes;
TIMER_STATS = whenOlder "4.11" yes;
DEBUG_NX_TEST = whenOlder "4.11" no;
DEBUG_STACK_USAGE = no;
DEBUG_STACKOVERFLOW = option no;
RCU_TORTURE_TEST = no;
SCHEDSTATS = no;
DETECT_HUNG_TASK = yes;
CRASH_DUMP = option no;
# Easier debugging of NFS issues.
SUNRPC_DEBUG = yes;
# Provide access to tunables like sched_migration_cost_ns
SCHED_DEBUG = yes;
};
power-management = {
PM_ADVANCED_DEBUG = yes;
X86_INTEL_LPSS = yes;
X86_INTEL_PSTATE = yes;
INTEL_IDLE = yes;
CPU_FREQ_DEFAULT_GOV_PERFORMANCE = yes;
CPU_FREQ_GOV_SCHEDUTIL = whenAtLeast "4.9" yes;
PM_WAKELOCKS = yes;
# Power-capping framework and support for INTEL RAPL
POWERCAP = yes;
INTEL_RAPL = whenAtLeast "5.3" module;
};
external-firmware = {
# Support drivers that need external firmware.
STANDALONE = no;
};
proc-config-gz = {
# Make /proc/config.gz available
IKCONFIG = yes;
IKCONFIG_PROC = yes;
};
optimization = {
# Optimize with -O2, not -Os
CC_OPTIMIZE_FOR_SIZE = no;
};
memtest = {
MEMTEST = yes;
};
# Include the CFQ I/O scheduler in the kernel, rather than as a
# module, so that the initrd gets a good I/O scheduler.
scheduler = {
IOSCHED_CFQ = whenOlder "5.0" yes; # Removed in 5.0-RC1
BLK_CGROUP = yes; # required by CFQ"
BLK_CGROUP_IOLATENCY = whenAtLeast "4.19" yes;
BLK_CGROUP_IOCOST = whenAtLeast "5.4" yes;
IOSCHED_DEADLINE = whenOlder "5.0" yes; # Removed in 5.0-RC1
MQ_IOSCHED_DEADLINE = whenAtLeast "4.11" yes;
BFQ_GROUP_IOSCHED = whenAtLeast "4.12" yes;
MQ_IOSCHED_KYBER = whenAtLeast "4.12" yes;
IOSCHED_BFQ = whenAtLeast "4.12" module;
};
# Enable NUMA.
numa = {
NUMA = option yes;
};
networking = {
NET = yes;
IP_ADVANCED_ROUTER = yes;
IP_PNP = no;
IP_VS_PROTO_TCP = yes;
IP_VS_PROTO_UDP = yes;
IP_VS_PROTO_ESP = yes;
IP_VS_PROTO_AH = yes;
IP_VS_IPV6 = yes;
IP_DCCP_CCID3 = no; # experimental
CLS_U32_PERF = yes;
CLS_U32_MARK = yes;
BPF_JIT = whenPlatformHasEBPFJit yes;
BPF_JIT_ALWAYS_ON = whenPlatformHasEBPFJit no; # whenPlatformHasEBPFJit yes; # see https://github.com/NixOS/nixpkgs/issues/79304
HAVE_EBPF_JIT = whenPlatformHasEBPFJit yes;
BPF_STREAM_PARSER = whenAtLeast "4.19" yes;
XDP_SOCKETS = whenAtLeast "4.19" yes;
XDP_SOCKETS_DIAG = whenAtLeast "5.1" yes;
WAN = yes;
TCP_CONG_CUBIC = yes; # This is the default congestion control algorithm since 2.6.19
# Required by systemd per-cgroup firewalling
CGROUP_BPF = option yes;
CGROUP_NET_PRIO = yes; # Required by systemd
IP_ROUTE_VERBOSE = yes;
IP_MROUTE_MULTIPLE_TABLES = yes;
IP_MULTICAST = yes;
IP_MULTIPLE_TABLES = yes;
IPV6 = yes;
IPV6_ROUTER_PREF = yes;
IPV6_ROUTE_INFO = yes;
IPV6_OPTIMISTIC_DAD = yes;
IPV6_MULTIPLE_TABLES = yes;
IPV6_SUBTREES = yes;
IPV6_MROUTE = yes;
IPV6_MROUTE_MULTIPLE_TABLES = yes;
IPV6_PIMSM_V2 = yes;
IPV6_FOU_TUNNEL = whenAtLeast "4.7" module;
IPV6_SEG6_LWTUNNEL = whenAtLeast "4.10" yes;
IPV6_SEG6_HMAC = whenAtLeast "4.10" yes;
IPV6_SEG6_BPF = whenAtLeast "4.18" yes;
NET_CLS_BPF = whenAtLeast "4.4" module;
NET_ACT_BPF = whenAtLeast "4.4" module;
NET_SCHED = yes;
L2TP_V3 = yes;
L2TP_IP = module;
L2TP_ETH = module;
BRIDGE_VLAN_FILTERING = yes;
BONDING = module;
NET_L3_MASTER_DEV = option yes;
NET_FOU_IP_TUNNELS = option yes;
IP_NF_TARGET_REDIRECT = module;
PPP_MULTILINK = yes; # PPP multilink support
PPP_FILTER = yes;
# needed for iwd WPS support (wpa_supplicant replacement)
KEY_DH_OPERATIONS = whenAtLeast "4.7" yes;
# needed for nftables
# Networking Options
NETFILTER = yes;
NETFILTER_ADVANCED = yes;
# Core Netfilter Configuration
NF_CONNTRACK_ZONES = yes;
NF_CONNTRACK_EVENTS = yes;
NF_CONNTRACK_TIMEOUT = yes;
NF_CONNTRACK_TIMESTAMP = yes;
NETFILTER_NETLINK_GLUE_CT = yes;
NF_TABLES_INET = mkMerge [ (whenOlder "4.17" module)
(whenAtLeast "4.17" yes) ];
NF_TABLES_NETDEV = mkMerge [ (whenOlder "4.17" module)
(whenAtLeast "4.17" yes) ];
NFT_REJECT_NETDEV = whenAtLeast "5.11" module;
# IP: Netfilter Configuration
NF_TABLES_IPV4 = mkMerge [ (whenOlder "4.17" module)
(whenAtLeast "4.17" yes) ];
NF_TABLES_ARP = mkMerge [ (whenOlder "4.17" module)
(whenAtLeast "4.17" yes) ];
# IPv6: Netfilter Configuration
NF_TABLES_IPV6 = mkMerge [ (whenOlder "4.17" module)
(whenAtLeast "4.17" yes) ];
# Bridge Netfilter Configuration
NF_TABLES_BRIDGE = mkMerge [ (whenBetween "4.19" "5.3" yes)
(whenAtLeast "5.3" module) ];
# needed for `dropwatch`
# Builtin-only since https://github.com/torvalds/linux/commit/f4b6bcc7002f0e3a3428bac33cf1945abff95450
NET_DROP_MONITOR = yes;
# needed for ss
# Use a lower priority to allow these options to be overridden in hardened/config.nix
INET_DIAG = mkDefault module;
INET_TCP_DIAG = mkDefault module;
INET_UDP_DIAG = mkDefault module;
INET_RAW_DIAG = whenAtLeast "4.14" (mkDefault module);
INET_DIAG_DESTROY = whenAtLeast "4.9" (mkDefault yes);
# enable multipath-tcp
MPTCP = whenAtLeast "5.6" yes;
MPTCP_IPV6 = whenAtLeast "5.6" yes;
INET_MPTCP_DIAG = whenAtLeast "5.9" (mkDefault module);
};
wireless = {
CFG80211_WEXT = option yes; # Without it, ipw2200 drivers don't build
IPW2100_MONITOR = option yes; # support promiscuous mode
IPW2200_MONITOR = option yes; # support promiscuous mode
HOSTAP_FIRMWARE = option yes; # Support downloading firmware images with Host AP driver
HOSTAP_FIRMWARE_NVRAM = option yes;
ATH9K_PCI = option yes; # Detect Atheros AR9xxx cards on PCI(e) bus
ATH9K_AHB = option yes; # Ditto, AHB bus
B43_PHY_HT = option yes;
BCMA_HOST_PCI = option yes;
RTW88 = whenAtLeast "5.2" module;
RTW88_8822BE = mkMerge [ (whenBetween "5.2" "5.8" yes) (whenAtLeast "5.8" module) ];
RTW88_8822CE = mkMerge [ (whenBetween "5.2" "5.8" yes) (whenAtLeast "5.8" module) ];
};
fb = {
FB = yes;
FB_EFI = yes;
FB_NVIDIA_I2C = yes; # Enable DDC Support
FB_RIVA_I2C = yes;
FB_ATY_CT = yes; # Mach64 CT/VT/GT/LT (incl. 3D RAGE) support
FB_ATY_GX = yes; # Mach64 GX support
FB_SAVAGE_I2C = yes;
FB_SAVAGE_ACCEL = yes;
FB_SIS_300 = yes;
FB_SIS_315 = yes;
FB_3DFX_ACCEL = yes;
FB_VESA = yes;
FRAMEBUFFER_CONSOLE = yes;
FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER = whenAtLeast "4.19" yes;
FRAMEBUFFER_CONSOLE_ROTATION = yes;
FB_GEODE = mkIf (stdenv.hostPlatform.system == "i686-linux") yes;
};
video = {
# Allow specifying custom EDID on the kernel command line
DRM_LOAD_EDID_FIRMWARE = yes;
VGA_SWITCHEROO = yes; # Hybrid graphics support
DRM_GMA500 = whenAtLeast "5.12" module;
DRM_GMA600 = whenOlder "5.13" yes;
DRM_GMA3600 = whenOlder "5.12" yes;
DRM_VMWGFX_FBCON = yes;
# necessary for amdgpu polaris support
DRM_AMD_POWERPLAY = whenBetween "4.5" "4.9" yes;
# (experimental) amdgpu support for verde and newer chipsets
DRM_AMDGPU_SI = whenAtLeast "4.9" yes;
# (stable) amdgpu support for bonaire and newer chipsets
DRM_AMDGPU_CIK = whenAtLeast "4.9" yes;
# Allow device firmware updates
DRM_DP_AUX_CHARDEV = whenAtLeast "4.6" yes;
# amdgpu display core (DC) support
DRM_AMD_DC_DCN1_0 = whenBetween "4.15" "5.6" yes;
DRM_AMD_DC_PRE_VEGA = whenBetween "4.15" "4.18" yes;
DRM_AMD_DC_DCN2_0 = whenBetween "5.3" "5.6" yes;
DRM_AMD_DC_DCN2_1 = whenBetween "5.4" "5.6" yes;
DRM_AMD_DC_DCN3_0 = whenBetween "5.9" "5.11" yes;
DRM_AMD_DC_DCN = whenAtLeast "5.11" yes;
DRM_AMD_DC_HDCP = whenAtLeast "5.5" yes;
DRM_AMD_DC_SI = whenAtLeast "5.10" yes;
} // optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux") {
# Intel GVT-g graphics virtualization supports 64-bit only
DRM_I915_GVT = whenAtLeast "4.16" yes;
DRM_I915_GVT_KVMGT = whenAtLeast "4.16" module;
};
sound = {
SND_DYNAMIC_MINORS = yes;
SND_AC97_POWER_SAVE = yes; # AC97 Power-Saving Mode
SND_HDA_INPUT_BEEP = yes; # Support digital beep via input layer
SND_HDA_RECONFIG = yes; # Support reconfiguration of jack functions
# Support configuring jack functions via fw mechanism at boot
SND_HDA_PATCH_LOADER = yes;
SND_HDA_CODEC_CA0132_DSP = whenOlder "5.7" yes; # Enable DSP firmware loading on Creative Soundblaster Z/Zx/ZxR/Recon
SND_OSSEMUL = yes;
SND_USB_CAIAQ_INPUT = yes;
# Enable PSS mixer (Beethoven ADSP-16 and other compatible)
PSS_MIXER = whenOlder "4.12" yes;
# Enable Sound Open Firmware support
} // optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux" &&
versionAtLeast version "5.5") {
SND_SOC_SOF_TOPLEVEL = yes;
SND_SOC_SOF_ACPI = module;
SND_SOC_SOF_PCI = module;
SND_SOC_SOF_APOLLOLAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_APOLLOLAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_CANNONLAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_CANNONLAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_COFFEELAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_COFFEELAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_COMETLAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_COMETLAKE_H_SUPPORT = whenOlder "5.8" yes;
SND_SOC_SOF_COMETLAKE_LP_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_ELKHARTLAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_ELKHARTLAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_GEMINILAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_GEMINILAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_HDA_AUDIO_CODEC = yes;
SND_SOC_SOF_HDA_COMMON_HDMI_CODEC = whenOlder "5.7" yes;
SND_SOC_SOF_HDA_LINK = yes;
SND_SOC_SOF_ICELAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_ICELAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_INTEL_TOPLEVEL = yes;
SND_SOC_SOF_JASPERLAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_JASPERLAKE_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_MERRIFIELD = whenAtLeast "5.12" module;
SND_SOC_SOF_MERRIFIELD_SUPPORT = whenOlder "5.12" yes;
SND_SOC_SOF_TIGERLAKE = whenAtLeast "5.12" module;
SND_SOC_SOF_TIGERLAKE_SUPPORT = whenOlder "5.12" yes;
};
usb-serial = {
USB_SERIAL_GENERIC = yes; # USB Generic Serial Driver
} // optionalAttrs (versionOlder version "4.16") {
# Include firmware for various USB serial devices.
# Only applicable for kernels below 4.16, after that no firmware is shipped in the kernel tree.
USB_SERIAL_KEYSPAN_MPR = yes;
USB_SERIAL_KEYSPAN_USA28 = yes;
USB_SERIAL_KEYSPAN_USA28X = yes;
USB_SERIAL_KEYSPAN_USA28XA = yes;
USB_SERIAL_KEYSPAN_USA28XB = yes;
USB_SERIAL_KEYSPAN_USA19 = yes;
USB_SERIAL_KEYSPAN_USA18X = yes;
USB_SERIAL_KEYSPAN_USA19W = yes;
USB_SERIAL_KEYSPAN_USA19QW = yes;
USB_SERIAL_KEYSPAN_USA19QI = yes;
USB_SERIAL_KEYSPAN_USA49W = yes;
USB_SERIAL_KEYSPAN_USA49WLC = yes;
};
usb = {
USB_DEBUG = { optional = true; tristate = whenOlder "4.18" "n";};
USB_EHCI_ROOT_HUB_TT = yes; # Root Hub Transaction Translators
USB_EHCI_TT_NEWSCHED = yes; # Improved transaction translator scheduling
USB_HIDDEV = yes; # USB Raw HID Devices (like monitor controls and Uninterruptable Power Supplies)
};
# Filesystem options - in particular, enable extended attributes and
# ACLs for all filesystems that support them.
filesystem = {
FANOTIFY = yes;
TMPFS = yes;
TMPFS_POSIX_ACL = yes;
FS_ENCRYPTION = if (versionAtLeast version "5.1") then yes else whenAtLeast "4.9" (option module);
EXT2_FS_XATTR = yes;
EXT2_FS_POSIX_ACL = yes;
EXT2_FS_SECURITY = yes;
EXT3_FS_POSIX_ACL = yes;
EXT3_FS_SECURITY = yes;
EXT4_FS_POSIX_ACL = yes;
EXT4_FS_SECURITY = yes;
EXT4_ENCRYPTION = { optional = true; tristate = if (versionOlder version "4.8") then "m" else "y"; };
REISERFS_FS_XATTR = option yes;
REISERFS_FS_POSIX_ACL = option yes;
REISERFS_FS_SECURITY = option yes;
JFS_POSIX_ACL = option yes;
JFS_SECURITY = option yes;
XFS_QUOTA = option yes;
XFS_POSIX_ACL = option yes;
XFS_RT = option yes; # XFS Realtime subvolume support
OCFS2_DEBUG_MASKLOG = option no;
BTRFS_FS_POSIX_ACL = yes;
UBIFS_FS_ADVANCED_COMPR = option yes;
F2FS_FS = module;
F2FS_FS_SECURITY = option yes;
F2FS_FS_ENCRYPTION = option yes;
F2FS_FS_COMPRESSION = whenAtLeast "5.6" yes;
UDF_FS = module;
NFSD_PNFS = whenBetween "4.0" "4.6" yes;
NFSD_V2_ACL = yes;
NFSD_V3 = yes;
NFSD_V3_ACL = yes;
NFSD_V4 = yes;
NFSD_V4_SECURITY_LABEL = yes;
NFS_FSCACHE = yes;
NFS_SWAP = yes;
NFS_V3_ACL = yes;
NFS_V4_1 = yes; # NFSv4.1 client support
NFS_V4_2 = yes;
NFS_V4_SECURITY_LABEL = yes;
CIFS_XATTR = yes;
CIFS_POSIX = option yes;
CIFS_FSCACHE = yes;
CIFS_STATS = whenOlder "4.19" yes;
CIFS_WEAK_PW_HASH = yes;
CIFS_UPCALL = yes;
CIFS_ACL = whenOlder "5.3" yes;
CIFS_DFS_UPCALL = yes;
CIFS_SMB2 = whenOlder "4.13" yes;
CEPH_FSCACHE = yes;
CEPH_FS_POSIX_ACL = yes;
SQUASHFS_FILE_DIRECT = yes;
SQUASHFS_DECOMP_MULTI_PERCPU = yes;
SQUASHFS_XATTR = yes;
SQUASHFS_ZLIB = yes;
SQUASHFS_LZO = yes;
SQUASHFS_XZ = yes;
SQUASHFS_LZ4 = yes;
SQUASHFS_ZSTD = whenAtLeast "4.14" yes;
# Native Language Support modules, needed by some filesystems
NLS = yes;
NLS_DEFAULT = freeform "utf8";
NLS_UTF8 = module;
NLS_CODEPAGE_437 = module; # VFAT default for the codepage= mount option
NLS_ISO8859_1 = module; # VFAT default for the iocharset= mount option
DEVTMPFS = yes;
UNICODE = whenAtLeast "5.2" yes; # Casefolding support for filesystems
};
security = {
# Detect writes to read-only module pages
DEBUG_SET_MODULE_RONX = { optional = true; tristate = whenOlder "4.11" "y"; };
RANDOMIZE_BASE = option yes;
STRICT_DEVMEM = option yes; # Filter access to /dev/mem
SECURITY_SELINUX_BOOTPARAM_VALUE = whenOlder "5.1" (freeform "0"); # Disable SELinux by default
# Prevent processes from ptracing non-children processes
SECURITY_YAMA = option yes;
DEVKMEM = whenOlder "5.13" no; # Disable /dev/kmem
USER_NS = yes; # Support for user namespaces
SECURITY_APPARMOR = yes;
DEFAULT_SECURITY_APPARMOR = yes;
RANDOM_TRUST_CPU = whenAtLeast "4.19" yes; # allow RDRAND to seed the RNG
MODULE_SIG = no; # r13y, generates a random key during build and bakes it in
# Depends on MODULE_SIG and only really helps when you sign your modules
# and enforce signatures which we don't do by default.
SECURITY_LOCKDOWN_LSM = option no;
} // optionalAttrs (!stdenv.hostPlatform.isAarch32) {
# Detect buffer overflows on the stack
CC_STACKPROTECTOR_REGULAR = {optional = true; tristate = whenOlder "4.18" "y";};
};
microcode = {
MICROCODE = yes;
MICROCODE_INTEL = yes;
MICROCODE_AMD = yes;
} // optionalAttrs (versionAtLeast version "4.10") {
# Write Back Throttling
# https://lwn.net/Articles/682582/
# https://bugzilla.kernel.org/show_bug.cgi?id=12309#c655
BLK_WBT = yes;
BLK_WBT_SQ = whenOlder "5.0" yes; # Removed in 5.0-RC1
BLK_WBT_MQ = yes;
};
container = {
NAMESPACES = yes; # Required by 'unshare' used by 'nixos-install'
RT_GROUP_SCHED = no;
CGROUP_DEVICE = yes;
CGROUP_HUGETLB = yes;
CGROUP_PERF = yes;
CGROUP_RDMA = whenAtLeast "4.11" yes;
MEMCG = yes;
MEMCG_SWAP = yes;
DEVPTS_MULTIPLE_INSTANCES = whenOlder "4.7" yes;
BLK_DEV_THROTTLING = yes;
CFQ_GROUP_IOSCHED = whenOlder "5.0" yes; # Removed in 5.0-RC1
CGROUP_PIDS = whenAtLeast "4.3" yes;
};
staging = {
# Enable staging drivers. These are somewhat experimental, but
# they generally don't hurt.
STAGING = yes;
};
proc-events = {
# PROC_EVENTS requires that the netlink connector is not built
# as a module. This is required by libcgroup's cgrulesengd.
CONNECTOR = yes;
PROC_EVENTS = yes;
};
tracing = {
FTRACE = yes;
KPROBES = yes;
FUNCTION_TRACER = yes;
FTRACE_SYSCALLS = yes;
SCHED_TRACER = yes;
STACK_TRACER = yes;
UPROBE_EVENT = { optional = true; tristate = whenOlder "4.11" "y";};
UPROBE_EVENTS = { optional = true; tristate = whenAtLeast "4.11" "y";};
BPF_SYSCALL = whenAtLeast "4.4" yes;
BPF_EVENTS = whenAtLeast "4.4" yes;
FUNCTION_PROFILER = yes;
RING_BUFFER_BENCHMARK = no;
};
virtualisation = {
PARAVIRT = option yes;
HYPERVISOR_GUEST = yes;
PARAVIRT_SPINLOCKS = option yes;
KVM_APIC_ARCHITECTURE = whenOlder "4.8" yes;
KVM_ASYNC_PF = yes;
KVM_COMPAT = { optional = true; tristate = whenBetween "4.0" "4.12" "y"; };
KVM_DEVICE_ASSIGNMENT = { optional = true; tristate = whenBetween "3.10" "4.12" "y"; };
KVM_GENERIC_DIRTYLOG_READ_PROTECT = whenAtLeast "4.0" yes;
KVM_GUEST = yes;
KVM_MMIO = yes;
KVM_VFIO = yes;
KSM = yes;
VIRT_DRIVERS = yes;
# We need 64 GB (PAE) support for Xen guest support
HIGHMEM64G = { optional = true; tristate = mkIf (!stdenv.is64bit) "y";};
VFIO_PCI_VGA = mkIf stdenv.is64bit yes;
# VirtualBox guest drivers in the kernel conflict with the ones in the
# official additions package and prevent the vboxsf module from loading,
# so disable them for now.
VBOXGUEST = option no;
DRM_VBOXVIDEO = option no;
XEN = option yes;
XEN_DOM0 = option yes;
PCI_XEN = option yes;
HVC_XEN = option yes;
HVC_XEN_FRONTEND = option yes;
XEN_SYS_HYPERVISOR = option yes;
SWIOTLB_XEN = option yes;
XEN_BACKEND = option yes;
XEN_BALLOON = option yes;
XEN_BALLOON_MEMORY_HOTPLUG = option yes;
XEN_EFI = option yes;
XEN_HAVE_PVMMU = option yes;
XEN_MCE_LOG = option yes;
XEN_PVH = option yes;
XEN_PVHVM = option yes;
XEN_SAVE_RESTORE = option yes;
XEN_SCRUB_PAGES = option yes;
XEN_SELFBALLOONING = option yes;
XEN_STUB = option yes;
XEN_TMEM = option yes;
};
media = {
MEDIA_DIGITAL_TV_SUPPORT = yes;
MEDIA_CAMERA_SUPPORT = yes;
MEDIA_RC_SUPPORT = whenOlder "4.14" yes;
MEDIA_CONTROLLER = yes;
MEDIA_PCI_SUPPORT = yes;
MEDIA_USB_SUPPORT = yes;
MEDIA_ANALOG_TV_SUPPORT = yes;
VIDEO_STK1160_COMMON = module;
VIDEO_STK1160_AC97 = whenOlder "4.11" yes;
};
"9p" = {
# Enable the 9P cache to speed up NixOS VM tests.
"9P_FSCACHE" = option yes;
"9P_FS_POSIX_ACL" = option yes;
};
huge-page = {
TRANSPARENT_HUGEPAGE = option yes;
TRANSPARENT_HUGEPAGE_ALWAYS = option no;
TRANSPARENT_HUGEPAGE_MADVISE = option yes;
};
zram = {
ZRAM = module;
ZSWAP = option yes;
ZBUD = option yes;
ZSMALLOC = module;
};
brcmfmac = {
# Enable PCIe and USB for the brcmfmac driver
BRCMFMAC_USB = option yes;
BRCMFMAC_PCIE = option yes;
};
# Support x2APIC (which requires IRQ remapping)
x2apic = optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux") {
X86_X2APIC = yes;
IRQ_REMAP = yes;
};
# Disable various self-test modules that have no use in a production system
tests = {
# This menu disables all/most of them on >= 4.16
RUNTIME_TESTING_MENU = option no;
} // optionalAttrs (versionOlder version "4.16") {
# For older kernels, painstakingly disable each symbol.
ARM_KPROBES_TEST = option no;
ASYNC_RAID6_TEST = option no;
ATOMIC64_SELFTEST = option no;
BACKTRACE_SELF_TEST = option no;
INTERVAL_TREE_TEST = option no;
PERCPU_TEST = option no;
RBTREE_TEST = option no;
TEST_BITMAP = option no;
TEST_BPF = option no;
TEST_FIRMWARE = option no;
TEST_HASH = option no;
TEST_HEXDUMP = option no;
TEST_KMOD = option no;
TEST_KSTRTOX = option no;
TEST_LIST_SORT = option no;
TEST_LKM = option no;
TEST_PARMAN = option no;
TEST_PRINTF = option no;
TEST_RHASHTABLE = option no;
TEST_SORT = option no;
TEST_STATIC_KEYS = option no;
TEST_STRING_HELPERS = option no;
TEST_UDELAY = option no;
TEST_USER_COPY = option no;
TEST_UUID = option no;
} // {
CRC32_SELFTEST = option no;
CRYPTO_TEST = option no;
EFI_TEST = option no;
GLOB_SELFTEST = option no;
DRM_DEBUG_MM_SELFTEST = { optional = true; tristate = whenOlder "4.18" "n";};
LNET_SELFTEST = { optional = true; tristate = whenOlder "4.18" "n";};
LOCK_TORTURE_TEST = option no;
MTD_TESTS = option no;
NOTIFIER_ERROR_INJECTION = option no;
RCU_PERF_TEST = option no;
RCU_TORTURE_TEST = option no;
TEST_ASYNC_DRIVER_PROBE = option no;
WW_MUTEX_SELFTEST = option no;
XZ_DEC_TEST = option no;
};
criu = if (versionAtLeast version "4.19") then {
# Unconditionally enabled, because it is required for CRIU and
# it provides the kcmp() system call that Mesa depends on.
CHECKPOINT_RESTORE = yes;
} else optionalAttrs (features.criu or false) ({
# For older kernels, CHECKPOINT_RESTORE is hidden behind EXPERT.
EXPERT = yes;
CHECKPOINT_RESTORE = yes;
} // optionalAttrs (features.criu_revert_expert or true) {
RFKILL_INPUT = option yes;
HID_PICOLCD_FB = option yes;
HID_PICOLCD_BACKLIGHT = option yes;
HID_PICOLCD_LCD = option yes;
HID_PICOLCD_LEDS = option yes;
HID_PICOLCD_CIR = option yes;
DEBUG_MEMORY_INIT = option yes;
});
misc = let
# Use zstd for kernel compression if 64-bit and newer than 5.9, otherwise xz.
# i686 issues: https://github.com/NixOS/nixpkgs/pull/117961#issuecomment-812106375
useZstd = stdenv.buildPlatform.is64bit && versionAtLeast version "5.9";
in {
KERNEL_XZ = mkIf (!useZstd) yes;
KERNEL_ZSTD = mkIf useZstd yes;
HID_BATTERY_STRENGTH = yes;
# enabled by default in x86_64 but not arm64, so we do that here
HIDRAW = yes;
HID_ACRUX_FF = yes;
DRAGONRISE_FF = yes;
HOLTEK_FF = yes;
SONY_FF = yes;
SMARTJOYPLUS_FF = yes;
THRUSTMASTER_FF = yes;
ZEROPLUS_FF = yes;
MODULE_COMPRESS = whenOlder "5.13" yes;
MODULE_COMPRESS_XZ = yes;
SYSVIPC = yes; # System-V IPC
AIO = yes; # POSIX asynchronous I/O
UNIX = yes; # Unix domain sockets.
MD = yes; # Device mapper (RAID, LVM, etc.)
# Enable initrd support.
BLK_DEV_INITRD = yes;
PM_TRACE_RTC = no; # Disable some expensive (?) features.
ACCESSIBILITY = yes; # Accessibility support
AUXDISPLAY = yes; # Auxiliary Display support
DONGLE = whenOlder "4.17" yes; # Serial dongle support
HIPPI = yes;
MTD_COMPLEX_MAPPINGS = yes; # needed for many devices
SCSI_LOWLEVEL = yes; # enable lots of SCSI devices
SCSI_LOWLEVEL_PCMCIA = yes;
SCSI_SAS_ATA = yes; # added to enable detection of hard drive
SPI = yes; # needed for many devices
SPI_MASTER = yes;
"8139TOO_8129" = yes;
"8139TOO_PIO" = no; # PIO is slower
AIC79XX_DEBUG_ENABLE = no;
AIC7XXX_DEBUG_ENABLE = no;
AIC94XX_DEBUG = no;
B43_PCMCIA = { optional=true; tristate = whenOlder "4.4" "y";};
BLK_DEV_INTEGRITY = yes;
BLK_SED_OPAL = whenAtLeast "4.14" yes;
BSD_PROCESS_ACCT_V3 = yes;
BT_HCIUART_BCSP = option yes;
BT_HCIUART_H4 = option yes; # UART (H4) protocol support
BT_HCIUART_LL = option yes;
BT_RFCOMM_TTY = option yes; # RFCOMM TTY support
CLEANCACHE = option yes;
CRASH_DUMP = option no;
DVB_DYNAMIC_MINORS = option yes; # we use udev
EFI_STUB = yes; # EFI bootloader in the bzImage itself
CGROUPS = yes; # used by systemd
FHANDLE = yes; # used by systemd
SECCOMP = yes; # used by systemd >= 231
SECCOMP_FILTER = yes; # ditto
POSIX_MQUEUE = yes;
FRONTSWAP = yes;
FUSION = yes; # Fusion MPT device support
IDE = no; # deprecated IDE support
IDLE_PAGE_TRACKING = yes;
IRDA_ULTRA = whenOlder "4.17" yes; # Ultra (connectionless) protocol
JOYSTICK_IFORCE_232 = { optional = true; tristate = whenOlder "5.3" "y"; }; # I-Force Serial joysticks and wheels
JOYSTICK_IFORCE_USB = { optional = true; tristate = whenOlder "5.3" "y"; }; # I-Force USB joysticks and wheels
JOYSTICK_XPAD_FF = option yes; # X-Box gamepad rumble support
JOYSTICK_XPAD_LEDS = option yes; # LED Support for Xbox360 controller 'BigX' LED
KEYBOARD_APPLESPI = whenAtLeast "5.3" module;
KEXEC_FILE = option yes;
KEXEC_JUMP = option yes;
PARTITION_ADVANCED = yes; # Needed for LDM_PARTITION
# Windows Logical Disk Manager (Dynamic Disk) support
LDM_PARTITION = yes;
LOGIRUMBLEPAD2_FF = yes; # Logitech Rumblepad 2 force feedback
LOGO = no; # not needed
MEDIA_ATTACH = yes;
MEGARAID_NEWGEN = yes;
MLX4_EN_VXLAN = whenOlder "4.8" yes;
MLX5_CORE_EN = option yes;
NVME_MULTIPATH = whenAtLeast "4.15" yes;
PSI = whenAtLeast "4.20" yes;
MODVERSIONS = whenOlder "4.9" yes;
MOUSE_ELAN_I2C_SMBUS = yes;
MOUSE_PS2_ELANTECH = yes; # Elantech PS/2 protocol extension
MTRR_SANITIZER = yes;
NET_FC = yes; # Fibre Channel driver support
# GPIO on Intel Bay Trail, for some Chromebook internal eMMC disks
PINCTRL_BAYTRAIL = yes;
# 8 is default. Modern gpt tables on eMMC may go far beyond 8.
MMC_BLOCK_MINORS = freeform "32";
REGULATOR = yes; # Voltage and Current Regulator Support
RC_DEVICES = option yes; # Enable IR devices
RT2800USB_RT53XX = yes;
RT2800USB_RT55XX = yes;
SCHED_AUTOGROUP = yes;
CFS_BANDWIDTH = yes;
SCSI_LOGGING = yes; # SCSI logging facility
SERIAL_8250 = yes; # 8250/16550 and compatible serial support
SLIP_COMPRESSED = yes; # CSLIP compressed headers
SLIP_SMART = yes;
HWMON = yes;
THERMAL_HWMON = yes; # Hardware monitoring support
NVME_HWMON = whenAtLeast "5.5" yes; # NVMe drives temperature reporting
UEVENT_HELPER = no;
USERFAULTFD = yes;
X86_CHECK_BIOS_CORRUPTION = yes;
X86_MCE = yes;
RAS = yes; # Needed for EDAC support
# Our initrd init uses shebang scripts, so can't be modular.
BINFMT_SCRIPT = yes;
# For systemd-binfmt
BINFMT_MISC = option yes;
# Disable the firmware helper fallback, udev doesn't implement it any more
FW_LOADER_USER_HELPER_FALLBACK = option no;
HOTPLUG_PCI_ACPI = yes; # PCI hotplug using ACPI
HOTPLUG_PCI_PCIE = yes; # PCI-Expresscard hotplug support
# Enable AMD's ROCm GPU compute stack
HSA_AMD = mkIf stdenv.hostPlatform.is64bit (whenAtLeast "4.20" yes);
ZONE_DEVICE = mkIf stdenv.hostPlatform.is64bit (whenAtLeast "5.3" yes);
HMM_MIRROR = whenAtLeast "5.3" yes;
DRM_AMDGPU_USERPTR = whenAtLeast "5.3" yes;
PREEMPT = no;
PREEMPT_VOLUNTARY = yes;
X86_AMD_PLATFORM_DEVICE = yes;
X86_PLATFORM_DRIVERS_DELL = whenAtLeast "5.12" yes;
LIRC = mkMerge [ (whenOlder "4.16" module) (whenAtLeast "4.17" yes) ];
} // optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux" || stdenv.hostPlatform.system == "aarch64-linux") {
# Enable CPU/memory hotplug support
# Allows you to dynamically add & remove CPUs/memory to a VM client running NixOS without requiring a reboot
ACPI_HOTPLUG_CPU = yes;
ACPI_HOTPLUG_MEMORY = yes;
MEMORY_HOTPLUG = yes;
MEMORY_HOTREMOVE = yes;
HOTPLUG_CPU = yes;
MIGRATION = yes;
SPARSEMEM = yes;
# Bump the maximum number of CPUs to support systems like EC2 x1.*
# instances and Xeon Phi.
NR_CPUS = freeform "384";
} // optionalAttrs (stdenv.hostPlatform.system == "armv7l-linux" || stdenv.hostPlatform.system == "aarch64-linux") {
# Enables support for the Allwinner Display Engine 2.0
SUN8I_DE2_CCU = whenAtLeast "4.13" yes;
# See comments on https://github.com/NixOS/nixpkgs/commit/9b67ea9106102d882f53d62890468071900b9647
CRYPTO_AEGIS128_SIMD = whenAtLeast "5.4" no;
# Distros should configure the default as a kernel option.
# We previously defined it on the kernel command line as cma=
# The kernel command line will override a platform-specific configuration from its device tree.
# https://github.com/torvalds/linux/blob/856deb866d16e29bd65952e0289066f6078af773/kernel/dma/contiguous.c#L35-L44
CMA_SIZE_MBYTES = freeform "32";
# Many ARM SBCs hand off a pre-configured framebuffer.
# This always can can be replaced by the actual native driver.
# Keeping it a built-in ensures it will be used if possible.
FB_SIMPLE = yes;
};
};
in
flattenKConf options