efi/x86: Don't relocate the kernel unless necessary

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Add alignment slack to the PE image size, so that we can realign the
decompression buffer within the space allocated for the image.

Only relocate the kernel if it has been loaded at an unsuitable address:

 - Below LOAD_PHYSICAL_ADDR, or
 - Above 64T for 64-bit and 512MiB for 32-bit

For 32-bit, the upper limit is conservative, but the exact limit can be
difficult to calculate.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200303221205.4048668-6-nivedita@alum.mit.edu
Link: https://lore.kernel.org/r/20200308080859.21568-20-ardb@kernel.org

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Arvind Sankar 2020-03-08 09:08:50 +01:00 • committed by Ingo Molnar

parent 964124a97b

commit d5cdf4cfea

2 changed files with 36 additions and 13 deletions

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16

arch/x86/boot/tools/build.c

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33

drivers/firmware/efi/libstub/x86-stub.c

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