diff options
Diffstat (limited to 'arch/loongarch/kernel/efi.c')
| -rw-r--r-- | arch/loongarch/kernel/efi.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c index de21e72759ee..860a3bc030e0 100644 --- a/arch/loongarch/kernel/efi.c +++ b/arch/loongarch/kernel/efi.c @@ -144,6 +144,18 @@ void __init efi_init(void) if (efi_memmap_init_early(&data) < 0) panic("Unable to map EFI memory map.\n"); + /* + * Reserve the physical memory region occupied by the EFI + * memory map table (header + descriptors). This is crucial + * for kdump, as the kdump kernel relies on this original + * memmap passed by the bootloader. Without reservation, + * this region could be overwritten by the primary kernel. + * Also, set the EFI_PRESERVE_BS_REGIONS flag to indicate that + * critical boot services code/data regions like this are preserved. + */ + memblock_reserve((phys_addr_t)boot_memmap, sizeof(*tbl) + data.size); + set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags); + early_memunmap(tbl, sizeof(*tbl)); } |