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x86/boot: Provide PIC aliases for 5-level paging related constants

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Provide PIC aliases for the global variables related to 5-level paging, so
that the startup code can access them in order to populate the kernel page
tables.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250828102202.1849035-35-ardb+git@google.com
This commit is contained in:
Ard Biesheuvel 2025-08-28 12:22:14 +02:00 committed by Borislav Petkov (AMD)
parent 68a501d7fd
commit f27906b287
1 changed files with 3 additions and 0 deletions
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arch/x86/kernel/head64.c
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@ -52,10 +52,13 @@ SYM_PIC_ALIAS(next_early_pgt);
pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
unsigned int __pgtable_l5_enabled __ro_after_init;
SYM_PIC_ALIAS(__pgtable_l5_enabled);
unsigned int pgdir_shift __ro_after_init = 39;
EXPORT_SYMBOL(pgdir_shift);
SYM_PIC_ALIAS(pgdir_shift);
unsigned int ptrs_per_p4d __ro_after_init = 1;
EXPORT_SYMBOL(ptrs_per_p4d);
SYM_PIC_ALIAS(ptrs_per_p4d);
unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4;
EXPORT_SYMBOL(page_offset_base);