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arm64: Fix 5-level paging support in kexec/hibernate trampoline

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Add the missing code to allocate P4D level page tables when cloning the
the kernel page tables. This fixes a crash that may be observed when
attempting to resume from hibernation on an LPA2 capable system with 4k
pages, which therefore uses 5 levels of paging.

Presumably, kexec is equally affected.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250110175145.785702-2-ardb+git@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ard Biesheuvel 2025-01-10 18:51:46 +01:00 • committed by Will Deacon
parent 2014c95afe
commit 3648027de1
1 changed files with 7 additions and 0 deletions
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7
arch/arm64/mm/trans_pgd.c
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@ -162,6 +162,13 @@ static int copy_p4d(struct trans_pgd_info *info, pgd_t *dst_pgdp,
unsigned long next;
unsigned long addr = start;
if (pgd_none(READ_ONCE(*dst_pgdp))) {
dst_p4dp = trans_alloc(info);
if (!dst_p4dp)
return -ENOMEM;
pgd_populate(NULL, dst_pgdp, dst_p4dp);
}
dst_p4dp = p4d_offset(dst_pgdp, start);
src_p4dp = p4d_offset(src_pgdp, start);
do {