kernel_config.md

Kernel Configuration for BPF Features

BPF Related Kernel Configurations

Functionalities	Kernel Configuration	Description
Basic	CONFIG_BPF_SYSCALL	Enable the bpf() system call
	CONFIG_BPF_JIT	BPF programs are normally handled by a BPF interpreter. This option allows the kernel to generate native code when a program is loaded into the kernel. This will significantly speed-up processing of BPF programs
	CONFIG_HAVE_BPF_JIT	Enable BPF Just In Time compiler
	CONFIG_HAVE_EBPF_JIT	Extended BPF JIT (eBPF)
	CONFIG_HAVE_CBPF_JIT	Classic BPF JIT (cBPF)
	CONFIG_MODULES	Enable to build loadable kernel modules
	CONFIG_BPF	BPF VM interpreter
	CONFIG_BPF_EVENTS	Allow the user to attach BPF programs to kprobe, uprobe, and tracepoint events
	CONFIG_PERF_EVENTS	Kernel performance events and counters
	CONFIG_HAVE_PERF_EVENTS	Enable perf events
	CONFIG_PROFILING	Enable the extended profiling support mechanisms used by profilers
BTF	CONFIG_DEBUG_INFO_BTF	Generate deduplicated BTF type information from DWARF debug info
	CONFIG_PAHOLE_HAS_SPLIT_BTF	Generate BTF for each selected kernel module
	CONFIG_DEBUG_INFO_BTF_MODULES	Generate compact split BTF type information for kernel modules
Security	CONFIG_BPF_JIT_ALWAYS_ON	Enable BPF JIT and removes BPF interpreter to avoid speculative execution
	CONFIG_BPF_UNPRIV_DEFAULT_OFF	Disable unprivileged BPF by default by setting
Cgroup	CONFIG_CGROUP_BPF	Support for BPF programs attached to cgroups
Network	CONFIG_BPFILTER	BPF based packet filtering framework (BPFILTER)
	CONFIG_BPFILTER_UMH	This builds bpfilter kernel module with embedded user mode helper
	CONFIG_NET_CLS_BPF	BPF-based classifier - to classify packets based on programmable BPF (JIT'ed) filters as an alternative to ematches
	CONFIG_NET_ACT_BPF	Execute BPF code on packets. The BPF code will decide if the packet should be dropped or not
	CONFIG_BPF_STREAM_PARSER	Enable this to allow a TCP stream parser to be used with BPF_MAP_TYPE_SOCKMAP
	CONFIG_LWTUNNEL_BPF	Allow to run BPF programs as a nexthop action following a route lookup for incoming and outgoing packets
	CONFIG_NETFILTER_XT_MATCH_BPF	BPF matching applies a linux socket filter to each packet and accepts those for which the filter returns non-zero
	CONFIG_IPV6_SEG6_BPF	To support BPF seg6local hook. bpf: Add IPv6 Segment Routing helpersy. Reference
kprobes	CONFIG_KPROBE_EVENTS	This allows the user to add tracing events (similar to tracepoints) on the fly via the ftrace interface
	CONFIG_KPROBES	Enable kprobes-based dynamic events
	CONFIG_HAVE_KPROBES	Check if krpobes enabled
	CONFIG_HAVE_REGS_AND_STACK_ACCESS_API	This symbol should be selected by an architecture if it supports the API needed to access registers and stack entries from pt_regs. For example the kprobes-based event tracer needs this API.
	CONFIG_KPROBES_ON_FTRACE	Have kprobes on function tracer if arch supports full passing of pt_regs to function tracing
kprobe multi	CONFIG_FPROBE	Enable fprobe to attach the probe on multiple functions at once
kprobe override	CONFIG_BPF_KPROBE_OVERRIDE	Enable BPF programs to override a kprobed function
uprobes	CONFIG_UPROBE_EVENTS	Enable uprobes-based dynamic events
	CONFIG_ARCH_SUPPORTS_UPROBES	Arch specific uprobes support
	CONFIG_UPROBES	Uprobes is the user-space counterpart to kprobes: they enable instrumentation applications (such as 'perf probe') to establish unintrusive probes in user-space binaries and libraries, by executing handler functions when the probes are hit by user-space applications.
	CONFIG_MMU	MMU-based virtualised addressing space support by paged memory management
Tracepoints	CONFIG_TRACEPOINTS	Enable inserting tracepoints in the kernel and connect to proble functions
	CONFIG_HAVE_SYSCALL_TRACEPOINTS	Enable syscall enter/exit tracing
Raw Tracepoints	Same as Tracepoints
LSM	CONFIG_BPF_LSM	Enable instrumentation of the security hooks with BPF programs for implementing dynamic MAC and Audit Policies
LIRC	CONFIG_BPF_LIRC_MODE2	Allow attaching BPF programs to a lirc device