x86/kexec: Ensure preserve_context flag is set on return to kernel

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The swap_pages() function will only actually *swap*, as its name implies, if
the preserve_context flag in the %r11 register is non-zero. On the way back
from a ::preserve_context kexec, ensure that the %r11 register is non-zero so
that the pages get swapped back.

Fixes: 9e5683e2d0 ("x86/kexec: Only swap pages for ::preserve_context mode")
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250109140757.2841269-3-dwmw2@infradead.org

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David Woodhouse 2025-01-09 14:04:14 +00:00 • committed by Borislav Petkov (AMD)

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commit 4d5f1da98f

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arch/x86/kernel/relocate_kernel_64.S

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