x86/kexec: Add relocate_kernel() debugging support: Load a GDT

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There are some failure modes which lead to triple-faults in the
relocate_kernel() function, which is fairly much undebuggable
for normal mortals.

Adding a GDT in the relocate_kernel() environment is step 1 towards
being able to catch faults and do something more useful.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250312144257.2348250-2-dwmw2@infradead.org

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David Woodhouse 2025-03-12 14:34:13 +00:00 • committed by Ingo Molnar

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commit b25eb5f5e4

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arch/x86/kernel/relocate_kernel_64.S

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