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s390/mm: Fix clearing storage keys for huge pages 

[ Upstream commit 412050af2e ]

The function __storage_key_init_range() expects the end address to be
the first byte outside the range to be initialized. I.e. end - start
should be the size of the area to be initialized.

The current code works because __storage_key_init_range() will still loop
over every page in the range, but it is slower than using sske_frame().

Fixes: 3afdfca698 ("s390/mm: Clear skeys for newly mapped huge guest pmds")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20240416114220.28489-3-imbrenda@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Claudio Imbrenda 2024-04-16 13:42:20 +02:00 committed by Greg Kroah-Hartman
parent 8e63d2ba48
commit 74f677ab16
1 changed files with 1 additions and 1 deletions
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2
arch/s390/mm/hugetlbpage.c
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@ -146,7 +146,7 @@ static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
}
if (!test_and_set_bit(PG_arch_1, &page->flags))
__storage_key_init_range(paddr, paddr + size - 1);
__storage_key_init_range(paddr, paddr + size);
}
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,