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fc9c112f80
This patch creates kexec_elf_ops to load ELF binary file for
kexec_file_load() syscall.
However, for `kbuf->memsz` and `kbuf->buf_min`, special handling is
required, and the generic `kexec_elf_load()` cannot be used directly.
$ readelf -l vmlinux
...
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000010000 0x9000000000200000 0x9000000000200000
0x0000000002747a00 0x000000000287a0d8 RWE 0x10000
NOTE 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 R 0x8
phdr->p_paddr should have been a physical address, but it is a virtual
address on the current LoongArch. This will cause kexec_file to fail
when loading the kernel and need to be converted to a physical address.
From the above MemSiz, it can be seen that 0x287a0d8 isn't page aligned.
Although kexec_add_buffer() will perform PAGE_SIZE alignment on kbuf->
memsz, there is still a stampeding in the loaded kernel space and initrd
space. The initrd resolution failed when starting the second kernel.
It can be known from the link script vmlinux.lds.S that,
BSS_SECTION(0, SZ_64K, 8)
. = ALIGN(PECOFF_SEGMENT_ALIGN);
It needs to be aligned according to SZ_64K, so that after alignment, its
size is consistent with _kernel_asize.
The basic usage (vmlinux):
1) Load second kernel image:
# kexec -s -l vmlinux --initrd=initrd.img --reuse-cmdline
2) Startup second kernel:
# kexec -e
Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* kexec.h for kexec
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*
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* Copyright (C) 2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_KEXEC_H
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#define _ASM_KEXEC_H
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#include <asm/stacktrace.h>
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#include <asm/page.h>
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
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/* Reserve a page for the control code buffer */
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#define KEXEC_CONTROL_PAGE_SIZE PAGE_SIZE
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/* The native architecture */
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#define KEXEC_ARCH KEXEC_ARCH_LOONGARCH
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs)
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memcpy(newregs, oldregs, sizeof(*newregs));
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else
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prepare_frametrace(newregs);
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}
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#define ARCH_HAS_KIMAGE_ARCH
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struct kimage_arch {
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unsigned long efi_boot;
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unsigned long cmdline_ptr;
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unsigned long systable_ptr;
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};
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#ifdef CONFIG_KEXEC_FILE
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extern const struct kexec_file_ops kexec_efi_ops;
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extern const struct kexec_file_ops kexec_elf_ops;
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int arch_kimage_file_post_load_cleanup(struct kimage *image);
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#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
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extern int load_other_segments(struct kimage *image,
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unsigned long kernel_load_addr, unsigned long kernel_size,
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char *initrd, unsigned long initrd_len, char *cmdline, unsigned long cmdline_len);
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#endif
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typedef void (*do_kexec_t)(unsigned long efi_boot,
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unsigned long cmdline_ptr,
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unsigned long systable_ptr,
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unsigned long start_addr,
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unsigned long first_ind_entry);
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struct kimage;
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extern const unsigned char relocate_new_kernel[];
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extern const size_t relocate_new_kernel_size;
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extern void kexec_reboot(void);
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#ifdef CONFIG_SMP
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extern atomic_t kexec_ready_to_reboot;
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extern const unsigned char kexec_smp_wait[];
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#endif
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#endif /* !_ASM_KEXEC_H */
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