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s390/mm: Fix storage key clearing for guest huge pages

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[ Upstream commit 843c328068 ]

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: 964c2c05c9 ("s390/mm: Clear huge page storage keys on enable_skey")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20240416114220.28489-2-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 13:42:19 +02:00 committed by Greg Kroah-Hartman
parent 06780473cb
commit 655cbe1d4e
1 changed files with 1 additions and 1 deletions
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2
arch/s390/mm/gmap.c
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@ -2583,7 +2583,7 @@ static int __s390_enable_skey_hugetlb(pte_t *pte, unsigned long addr,
return 0;
start = pmd_val(*pmd) & HPAGE_MASK;
end = start + HPAGE_SIZE - 1;
end = start + HPAGE_SIZE;
__storage_key_init_range(start, end);
set_bit(PG_arch_1, &page->flags);
return 0;