x86/decompressor: Pass pgtable address to trampoline directly

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commit cb83cece57 upstream.

The only remaining use of the trampoline address by the trampoline
itself is deriving the page table address from it, and this involves
adding an offset of 0x0. So simplify this, and pass the new CR3 value
directly.

This makes the fact that the page table happens to be at the start of
the trampoline allocation an implementation detail of the caller.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230807162720.545787-15-ardb@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Ard Biesheuvel 2023-08-07 18:27:11 +02:00 • committed by Greg Kroah-Hartman

parent e2fa53a04c

commit df3dec320b

3 changed files with 8 additions and 11 deletions

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8

arch/x86/boot/compressed/head_64.S

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2

arch/x86/boot/compressed/pgtable.h

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9

arch/x86/boot/compressed/pgtable_64.c

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