From b2d73b2a0ad1c758cb0c1acb01a911744b845942 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Tue, 8 Mar 2016 11:54:42 +0100 Subject: s390/mm: extended gmap pte notifier The current gmap pte notifier forces a pte into to a read-write state. If the pte is invalidated the gmap notifier is called to inform KVM that the mapping will go away. Extend this approach to allow read-write, read-only and no-access as possible target states and call the pte notifier for any change to the pte. This mechanism is used to temporarily set specific access rights for a pte without doing the heavy work of a true mprotect call. Reviewed-by: David Hildenbrand Signed-off-by: Martin Schwidefsky Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/s390/include/asm/pgtable.h') diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 9951e7e59756..35dde6afffcf 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -886,6 +886,8 @@ void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t entry); void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep); void ptep_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep); +int ptep_force_prot(struct mm_struct *mm, unsigned long gaddr, + pte_t *ptep, int prot); void ptep_zap_unused(struct mm_struct *mm, unsigned long addr, pte_t *ptep , int reset); void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep); -- cgit v1.2.3