x86/startup_64: Defer assignment of 5-level paging global variables

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Assigning the 5-level paging related global variables from the earliest
C code using explicit references that use the 1:1 translation of memory
is unnecessary, as the startup code itself does not rely on them to
create the initial page tables, and this is all it should be doing. So
defer these assignments to the primary C entry code that executes via
the ordinary kernel virtual mapping.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240227151907.387873-13-ardb+git@google.com

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Ard Biesheuvel 2024-02-27 16:19:10 +01:00 • committed by Borislav Petkov (AMD)

parent dada858706

commit 63bed96604

2 changed files with 15 additions and 31 deletions

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arch/x86/include/asm/pgtable_64_types.h

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44

arch/x86/kernel/head64.c

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