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From: Pingfan Liu <piliu@redhat.com>
To: kexec@lists.infradead.org
Cc: Pingfan Liu <piliu@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	John Fastabend <john.fastabend@gmail.com>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <martin.lau@linux.dev>,
	Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
	Yonghong Song <yonghong.song@linux.dev>,
	Jeremy Linton <jeremy.linton@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Simon Horman <horms@kernel.org>,
	Gerd Hoffmann <kraxel@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Philipp Rudo <prudo@redhat.com>, Viktor Malik <vmalik@redhat.com>,
	Jan Hendrik Farr <kernel@jfarr.cc>, Baoquan He <bhe@redhat.com>,
	Dave Young <dyoung@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	bpf@vger.kernel.org, systemd-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: [PATCHv7 07/13] kexec_file: Introduce a bpf-prog lskel to run a format parser
Date: Sun, 22 Mar 2026 09:43:56 +0800	[thread overview]
Message-ID: <20260322014402.8815-8-piliu@redhat.com> (raw)
In-Reply-To: <20260322014402.8815-1-piliu@redhat.com>

Analague to kernel/bpf/preload/iterators/Makefile,
this Makefile is not invoked by the Kbuild system. It needs to be
invoked manually when kexec_pe_parser_bpf.c is changed so that
kexec_pe_parser_bpf.lskel.h can be re-generated by the command "bpftool
gen skeleton -L kexec_pe_parser_bpf.o".

kexec_pe_parser_bpf.lskel.h is used directly by the kernel kexec code in
later patch. For this patch, there are bpf bytecode contained in
opts_data[] and opts_insn[] in kexec_pe_parser_bpf.lskel.h, but in the
following patch, they will be removed and only the function API in
kexec_pe_parser_bpf.lskel.h left.

As exposed in kexec_pe_parser_bpf.lskel.h, the interface between
bpf-prog and the kernel are constituted by:

four maps:
                struct bpf_map_desc ringbuf_1;
                struct bpf_map_desc ringbuf_2;
                struct bpf_map_desc ringbuf_3;
                struct bpf_map_desc ringbuf_4;
four sections:
                struct bpf_map_desc rodata;
                struct bpf_map_desc data;
                struct bpf_map_desc rodata_str1_1;
                struct bpf_map_desc bss;

one prog:
	SEC("fentry.s/kexec_image_parser_anchor")

The interface of maps and sections are extracted in template.c, which
should be included by any bpf-prog to interact with kexec bpf component

Signed-off-by: Pingfan Liu <piliu@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Philipp Rudo <prudo@redhat.com>
Cc: bpf@vger.kernel.org
To: kexec@lists.infradead.org
---
 kernel/kexec_bpf/Makefile                    |  62 ++++
 kernel/kexec_bpf/kexec_pe_parser_bpf.c       |  12 +
 kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h | 371 +++++++++++++++++++
 kernel/kexec_bpf/template.c                  |  72 ++++
 4 files changed, 517 insertions(+)
 create mode 100644 kernel/kexec_bpf/Makefile
 create mode 100644 kernel/kexec_bpf/kexec_pe_parser_bpf.c
 create mode 100644 kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h
 create mode 100644 kernel/kexec_bpf/template.c

diff --git a/kernel/kexec_bpf/Makefile b/kernel/kexec_bpf/Makefile
new file mode 100644
index 0000000000000..45d45cc0855a3
--- /dev/null
+++ b/kernel/kexec_bpf/Makefile
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-2.0
+OUTPUT := .output
+CLANG ?= clang
+LLC ?= llc
+LLVM_STRIP ?= llvm-strip
+DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+LIBBPF_SRC := $(abspath ../../tools/lib/bpf)
+BPFOBJ := $(OUTPUT)/libbpf.a
+BPF_INCLUDE := $(OUTPUT)
+INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../tools/lib)        \
+       -I$(abspath ../../tools/include/uapi)
+CFLAGS := -g -Wall
+
+srctree := $(patsubst %/kernel/kexec_bpf,%,$(CURDIR))
+VMLINUX = $(srctree)/vmlinux
+
+abs_out := $(abspath $(OUTPUT))
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+.DELETE_ON_ERROR:
+
+.PHONY: all clean
+
+all: $(OUTPUT) kexec_pe_parser_bpf.lskel.h
+
+clean:
+	$(call msg,CLEAN)
+	$(Q)rm -rf $(OUTPUT) kexec_pe_parser_bpf.lskel.h
+
+kexec_pe_parser_bpf.lskel.h: $(OUTPUT)/kexec_pe_parser_bpf.o | $(BPFTOOL)
+	$(call msg,GEN-SKEL,$@)
+	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
+
+$(OUTPUT)/vmlinux.h: $(VMLINUX) $(DEFAULT_BPFTOOL) $(BPFOBJ) | $(OUTPUT)
+	@$(BPFTOOL) btf dump file $(VMLINUX) format c > $(OUTPUT)/vmlinux.h
+
+$(OUTPUT)/kexec_pe_parser_bpf.o: kexec_pe_parser_bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
+	$(call msg,BPF,$@)
+	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
+		 -c $(filter %.c,$^) -o $@ &&				      \
+	$(LLVM_STRIP) -g $@
+
+$(OUTPUT):
+	$(call msg,MKDIR,$@)
+	$(Q)mkdir -p $(OUTPUT)
+
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)			       \
+		    OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
+
+$(DEFAULT_BPFTOOL):
+	$(Q)$(MAKE) $(submake_extras) -C ../../tools/bpf/bpftool			      \
+		    prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install
diff --git a/kernel/kexec_bpf/kexec_pe_parser_bpf.c b/kernel/kexec_bpf/kexec_pe_parser_bpf.c
new file mode 100644
index 0000000000000..e4a2419240673
--- /dev/null
+++ b/kernel/kexec_bpf/kexec_pe_parser_bpf.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2025, 2026 Red Hat, Inc
+
+#include "template.c"
+
+SEC("fentry.s/kexec_image_parser_anchor")
+__attribute__((used)) int BPF_PROG(parse_pe, struct kexec_context *context,
+				unsigned long parser_id)
+{
+	return 0;
+}
diff --git a/kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h b/kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h
new file mode 100644
index 0000000000000..22fd77a872fc0
--- /dev/null
+++ b/kernel/kexec_bpf/kexec_pe_parser_bpf.lskel.h
@@ -0,0 +1,371 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __KEXEC_PE_PARSER_BPF_SKEL_H__
+#define __KEXEC_PE_PARSER_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct kexec_pe_parser_bpf {
+	struct bpf_loader_ctx ctx;
+	struct {
+		struct bpf_map_desc ringbuf_1;
+		struct bpf_map_desc ringbuf_2;
+		struct bpf_map_desc ringbuf_3;
+		struct bpf_map_desc ringbuf_4;
+		struct bpf_map_desc rodata;
+		struct bpf_map_desc data;
+		struct bpf_map_desc rodata_str1_1;
+		struct bpf_map_desc bss;
+	} maps;
+	struct {
+		struct bpf_prog_desc parse_pe;
+	} progs;
+	struct {
+		int parse_pe_fd;
+	} links;
+};
+
+static inline int
+kexec_pe_parser_bpf__parse_pe__attach(struct kexec_pe_parser_bpf *skel)
+{
+	int prog_fd = skel->progs.parse_pe.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.parse_pe_fd = fd;
+	return fd;
+}
+
+static inline int
+kexec_pe_parser_bpf__attach(struct kexec_pe_parser_bpf *skel)
+{
+	int ret = 0;
+
+	ret = ret < 0 ? ret : kexec_pe_parser_bpf__parse_pe__attach(skel);
+	return ret < 0 ? ret : 0;
+}
+
+static inline void
+kexec_pe_parser_bpf__detach(struct kexec_pe_parser_bpf *skel)
+{
+	skel_closenz(skel->links.parse_pe_fd);
+}
+static void
+kexec_pe_parser_bpf__destroy(struct kexec_pe_parser_bpf *skel)
+{
+	if (!skel)
+		return;
+	kexec_pe_parser_bpf__detach(skel);
+	skel_closenz(skel->progs.parse_pe.prog_fd);
+	skel_closenz(skel->maps.ringbuf_1.map_fd);
+	skel_closenz(skel->maps.ringbuf_2.map_fd);
+	skel_closenz(skel->maps.ringbuf_3.map_fd);
+	skel_closenz(skel->maps.ringbuf_4.map_fd);
+	skel_closenz(skel->maps.rodata.map_fd);
+	skel_closenz(skel->maps.data.map_fd);
+	skel_closenz(skel->maps.rodata_str1_1.map_fd);
+	skel_closenz(skel->maps.bss.map_fd);
+	skel_free(skel);
+}
+static inline struct kexec_pe_parser_bpf *
+kexec_pe_parser_bpf__open(void)
+{
+	struct kexec_pe_parser_bpf *skel;
+
+	skel = skel_alloc(sizeof(*skel));
+	if (!skel)
+		goto cleanup;
+	skel->ctx.sz = (void *)&skel->links - (void *)skel;
+	return skel;
+cleanup:
+	kexec_pe_parser_bpf__destroy(skel);
+	return NULL;
+}
+
+static inline int
+kexec_pe_parser_bpf__load(struct kexec_pe_parser_bpf *skel)
+{
+	struct bpf_load_and_run_opts opts = {};
+	int err;
+	static const char opts_data[] __attribute__((__aligned__(8))) = "\
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+\0\x61\x10\0\0\0\0\0\0\x63\x06\x48\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x10\0\
+\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x58\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x14\
+\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x68\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\
+\x18\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x78\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\
+\0\x1c\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x88\0\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\
+\0\0\0\0\0\0";
+	opts.ctx = (struct bpf_loader_ctx *)skel;
+	opts.data_sz = sizeof(opts_data) - 1;
+	opts.data = (void *)opts_data;
+	opts.insns_sz = sizeof(opts_insn) - 1;
+	opts.insns = (void *)opts_insn;
+
+	err = bpf_load_and_run(&opts);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+static inline struct kexec_pe_parser_bpf *
+kexec_pe_parser_bpf__open_and_load(void)
+{
+	struct kexec_pe_parser_bpf *skel;
+
+	skel = kexec_pe_parser_bpf__open();
+	if (!skel)
+		return NULL;
+	if (kexec_pe_parser_bpf__load(skel)) {
+		kexec_pe_parser_bpf__destroy(skel);
+		return NULL;
+	}
+	return skel;
+}
+
+__attribute__((unused)) static void
+kexec_pe_parser_bpf__assert(struct kexec_pe_parser_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __KEXEC_PE_PARSER_BPF_SKEL_H__ */
diff --git a/kernel/kexec_bpf/template.c b/kernel/kexec_bpf/template.c
new file mode 100644
index 0000000000000..7f1557cb38223
--- /dev/null
+++ b/kernel/kexec_bpf/template.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2026 Red Hat, Inc
+//
+// Original file: kernel/kexec_bpf/template.c
+//
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_core_read.h>
+#include <bpf/bpf_endian.h>
+#include <bpf/bpf_tracing.h>
+
+/* Mark the bpf parser success */
+#define KEXEC_BPF_CMD_DONE		0x1
+#define KEXEC_BPF_CMD_DECOMPRESS	0x2
+#define KEXEC_BPF_CMD_COPY		0x3
+#define KEXEC_BPF_CMD_VERIFY_SIG	0x4
+
+#define KEXEC_BPF_SUBCMD_KERNEL		0x1
+#define KEXEC_BPF_SUBCMD_INITRD		0x2
+#define KEXEC_BPF_SUBCMD_CMDLINE	0x3
+
+#define KEXEC_BPF_PIPELINE_FILL		0x1
+
+/*
+ * The ringbufs can have different capacity. But only four ringbuf are provided.
+ */
+#ifndef RINGBUF1_SIZE
+#define RINGBUF1_SIZE	4
+#endif
+#ifndef RINGBUF2_SIZE
+#define RINGBUF2_SIZE	4
+#endif
+#ifndef RINGBUF3_SIZE
+#define RINGBUF3_SIZE	4
+#endif
+#ifndef RINGBUF4_SIZE
+#define RINGBUF4_SIZE	4
+#endif
+
+/* ringbuf is safe since the user space has no write access to them */
+struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, RINGBUF1_SIZE);
+} ringbuf_1 SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, RINGBUF2_SIZE);
+} ringbuf_2 SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, RINGBUF3_SIZE);
+} ringbuf_3 SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_RINGBUF);
+	__uint(max_entries, RINGBUF4_SIZE);
+} ringbuf_4 SEC(".maps");
+
+char LICENSE[] SEC("license") = "GPL";
+
+/*
+ * This function ensures that the sections .rodata, .data, .rodata.str1.1 and .bss
+ * are created for a bpf prog.
+ */
+static const char dummy_rodata[16] __attribute__((used)) = "rodata";
+static char dummy_data[16] __attribute__((used)) = "data";
+static char *dummy_mergeable_str  __attribute__((used)) = ".rodata.str1.1";
+static char dummy_bss[16] __attribute__((used));
+
-- 
2.49.0


  parent reply	other threads:[~2026-03-22  1:46 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-22  1:43 [PATCHv7 00/13] kexec: Use BPF lskel to enable kexec to load PE format boot image Pingfan Liu
2026-03-22  1:43 ` [PATCHv7 01/13] bpf: Introduce kfuncs to parser buffer content Pingfan Liu
2026-03-22  2:14   ` bot+bpf-ci
2026-08-13 22:20   ` sashiko-bot
2026-03-22  1:43 ` [PATCHv7 02/13] kexec_file: Use bpf-prog to decompose image Pingfan Liu
2026-03-22  2:14   ` bot+bpf-ci
2026-03-22  1:43 ` [PATCHv7 03/13] lib/decompress: Keep decompressor when CONFIG_KEEP_DECOMPRESSOR Pingfan Liu
2026-03-22  2:26   ` bot+bpf-ci
2026-03-22  1:43 ` [PATCHv7 04/13] kexec_file: Implement decompress method for parser Pingfan Liu
2026-03-22  2:26   ` bot+bpf-ci
2026-03-22  1:43 ` [PATCHv7 05/13] kexec_file: Implement copy " Pingfan Liu
2026-03-22  1:43 ` [PATCHv7 06/13] kexec_file: Chain the stages into a pipeline Pingfan Liu
2026-03-22  2:14   ` bot+bpf-ci
2026-08-13 22:32   ` sashiko-bot
2026-03-22  1:43 ` Pingfan Liu [this message]
2026-03-22  1:43 ` [PATCHv7 08/13] kexec_file: Factor out routine to find a symbol in ELF Pingfan Liu
2026-03-22  2:14   ` bot+bpf-ci
2026-03-23  7:07   ` kernel test robot
2026-03-23 10:19   ` kernel test robot
2026-03-22  1:43 ` [PATCHv7 09/13] kexec_file: Integrate bpf light skeleton to load image with bpf-prog Pingfan Liu
2026-03-22  2:14   ` bot+bpf-ci
2026-03-22  1:43 ` [PATCHv7 10/13] arm64/kexec: Select KEXEC_BPF to support UEFI-style kernel image Pingfan Liu
2026-03-22  1:44 ` [PATCHv7 11/13] tools/kexec: Introduce a bpf-prog to handle zboot image Pingfan Liu
2026-03-22  2:26   ` bot+bpf-ci
2026-03-22  1:44 ` [PATCHv7 12/13] tools/kexec: Introduce a bpf-prog to handle UKI image Pingfan Liu
2026-08-13 22:41   ` sashiko-bot
2026-03-22  1:44 ` [PATCHv7 13/13] tools/kexec: Introduce a tool to build zboot envelop Pingfan Liu
2026-03-23 19:02 ` [PATCHv7 00/13] kexec: Use BPF lskel to enable kexec to load PE format boot image Andrew Morton
2026-03-24  7:09   ` Pingfan Liu

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