5.4-stable review patch. If anyone has any objections, please let me know.
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From: Claudio Imbrenda imbrenda@linux.ibm.com
[ Upstream commit 412050af2ea39407fe43324b0be4ab641530ce88 ]
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: 3afdfca69870 ("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 --- arch/s390/mm/hugetlbpage.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index ff8234bca56cd..6b688e3498c01 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -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,