Messages in this thread Patch in this message | | | From | Song Shuai <> | Subject | [PATCH V2 2/2] riscv: kexec_file: Support loading Image binary file | Date | Mon, 16 Oct 2023 17:20:06 +0800 |
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This patch creates image_kexec_ops to load Image binary file for kexec_file_load() syscall.
Signed-off-by: Song Shuai <songshuaishuai@tinylab.org> --- arch/riscv/include/asm/kexec.h | 1 + arch/riscv/kernel/Makefile | 2 +- arch/riscv/kernel/kexec_image.c | 98 ++++++++++++++++++++++++++ arch/riscv/kernel/machine_kexec_file.c | 1 + 4 files changed, 101 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/kernel/kexec_image.c
diff --git a/arch/riscv/include/asm/kexec.h b/arch/riscv/include/asm/kexec.h index 518825fe4160..b9ee8346cc8c 100644 --- a/arch/riscv/include/asm/kexec.h +++ b/arch/riscv/include/asm/kexec.h @@ -56,6 +56,7 @@ extern riscv_kexec_method riscv_kexec_norelocate; #ifdef CONFIG_KEXEC_FILE extern const struct kexec_file_ops elf_kexec_ops; +extern const struct kexec_file_ops image_kexec_ops; struct purgatory_info; int arch_kexec_apply_relocations_add(struct purgatory_info *pi, diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile index 1c62c639e875..9ecba3231a36 100644 --- a/arch/riscv/kernel/Makefile +++ b/arch/riscv/kernel/Makefile @@ -86,7 +86,7 @@ endif obj-$(CONFIG_HOTPLUG_CPU) += cpu-hotplug.o obj-$(CONFIG_KGDB) += kgdb.o obj-$(CONFIG_KEXEC_CORE) += kexec_relocate.o crash_save_regs.o machine_kexec.o -obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o machine_kexec_file.o +obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o kexec_image.o machine_kexec_file.o obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_CRASH_CORE) += crash_core.o diff --git a/arch/riscv/kernel/kexec_image.c b/arch/riscv/kernel/kexec_image.c new file mode 100644 index 000000000000..5339c4f33ff6 --- /dev/null +++ b/arch/riscv/kernel/kexec_image.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * RISC-V Kexec image loader + * + */ + +#define pr_fmt(fmt) "kexec_file(Image): " fmt + +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/kexec.h> +#include <linux/pe.h> +#include <linux/string.h> +#include <asm/byteorder.h> +#include <asm/image.h> +#include <linux/bitfield.h> + +static int image_probe(const char *kernel_buf, unsigned long kernel_len) +{ + const struct riscv_image_header *h = + (const struct riscv_image_header *)(kernel_buf); + + if (!h || (kernel_len < sizeof(*h))) + return -EINVAL; + + /* According to Documentation/riscv/boot-image-header.rst, + * use "magic2" field to check when version >= 0.2. + */ + + if (h->version >= RISCV_HEADER_VERSION && + memcmp(&h->magic2, RISCV_IMAGE_MAGIC2, sizeof(h->magic2))) + return -EINVAL; + + return 0; +} + +static void *image_load(struct kimage *image, + char *kernel, unsigned long kernel_len, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len) +{ + struct riscv_image_header *h; + u64 flags; + bool be_image, be_kernel; + struct kexec_buf kbuf; + int ret; + + /* Check Image header */ + h = (struct riscv_image_header *)kernel; + if (!h->image_size) { + ret = -EINVAL; + goto out; + } + + /* Check endianness */ + flags = le64_to_cpu(h->flags); + be_image = FIELD_GET(RISCV_IMAGE_FLAG_BE_MASK, flags); + be_kernel = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); + if (be_image != be_kernel) { + ret = -EINVAL; + goto out; + } + + /* Load the kernel image */ + kbuf.image = image; + kbuf.buf_min = 0; + kbuf.buf_max = ULONG_MAX; + kbuf.top_down = false; + + kbuf.buffer = kernel; + kbuf.bufsz = kernel_len; + kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; + kbuf.memsz = le64_to_cpu(h->image_size); + kbuf.buf_align = le64_to_cpu(h->text_offset); + + ret = kexec_add_buffer(&kbuf); + if (ret) { + pr_err("Error add kernel image ret=%d\n", ret); + goto out; + } + + image->start = kbuf.mem; + + pr_info("Loaded kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n", + kbuf.mem, kbuf.bufsz, kbuf.memsz); + + ret = load_extra_segments(image, kbuf.mem, kbuf.memsz, + initrd, initrd_len, cmdline, cmdline_len); + +out: + return ret ? ERR_PTR(ret) : NULL; +} + +const struct kexec_file_ops image_kexec_ops = { + .probe = image_probe, + .load = image_load, +}; diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c index aedb8c16a283..5dc700834f1e 100644 --- a/arch/riscv/kernel/machine_kexec_file.c +++ b/arch/riscv/kernel/machine_kexec_file.c @@ -17,6 +17,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = { &elf_kexec_ops, + &image_kexec_ops, NULL }; -- 2.20.1
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