From 33c77e73a56b08cbf77955447ef8656852eaf9e9 Mon Sep 17 00:00:00 2001 From: Claudio Imbrenda Date: Tue, 16 Apr 2024 13:42:19 +0200 Subject: [PATCH] s390/mm: Fix storage key clearing for guest huge pages BugLink: https://bugs.launchpad.net/bugs/2070349 [ Upstream commit 843c3280686fc1a83d89ee1e0b5599c9f6b09d0c ] 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: 964c2c05c9f3 ("s390/mm: Clear huge page storage keys on enable_skey") Reviewed-by: Heiko Carstens Signed-off-by: Claudio Imbrenda Link: https://lore.kernel.org/r/20240416114220.28489-2-imbrenda@linux.ibm.com Signed-off-by: Alexander Gordeev Signed-off-by: Sasha Levin Signed-off-by: Manuel Diewald Signed-off-by: Stefan Bader --- arch/s390/mm/gmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 08a7eca03daf..41a4a60c5e65 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2659,7 +2659,7 @@ 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); cond_resched();