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efi: Export boot-services code and data as debugfs-blobs

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Sometimes it is useful to be able to dump the efi boot-services code and
data. This commit adds these as debugfs-blobs to /sys/kernel/debug/efi,
but only if efi=debug is passed on the kernel-commandline as this requires
not freeing those memory-regions, which costs 20+ MB of RAM.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200115163554.101315-2-hdegoede@redhat.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Hans de Goede
2020-01-15 17:35:45 +01:00
committed by Ard Biesheuvel
parent bb6d3fb354
commit 0e72a6a3cf
4 changed files with 63 additions and 0 deletions
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arch/x86/platform/efi/efi.c
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@@ -243,6 +243,7 @@ int __init efi_memblock_x86_reserve_range(void)
efi.memmap.desc_version);
memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
return 0;
}