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arm64: mask out POIndex when modifying a PTE

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When a PTE is modified, the POIndex must be masked off so that it can be modified.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-16-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Joey Gouly 2024-08-22 16:10:58 +01:00 committed by Will Deacon
parent b3c03fe137
commit 6580a36dd7
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/include/asm/pgtable.h
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@ -1103,7 +1103,8 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
*/
const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
PTE_PRESENT_INVALID | PTE_VALID | PTE_WRITE |
PTE_GP | PTE_ATTRINDX_MASK;
PTE_GP | PTE_ATTRINDX_MASK | PTE_PO_IDX_MASK;
/* preserve the hardware dirty information */
if (pte_hw_dirty(pte))
pte = set_pte_bit(pte, __pgprot(PTE_DIRTY));