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s390/pgtable: fix mprotect for single-threaded KVM guests 

For a single-threaded KVM guest ptep_modify_prot_start will not use
IPTE, the invalid bit will therefore not be set. If DEBUG_VM is set
pgste_set_key called by ptep_modify_prot_commit will complain about
the missing invalid bit. ptep_modify_prot_start should set the
invalid bit in all cases.

Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
hifive-unleashed-5.1
Martin Schwidefsky 2013-08-27 08:19:27 +02:00
parent 0587d409ec
commit 0196c642f7
1 changed files with 1 additions and 0 deletions
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arch/s390/include/asm/pgtable.h
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@ -1093,6 +1093,7 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
pte = *ptep;
ptep_flush_lazy(mm, address, ptep);
pte_val(*ptep) |= _PAGE_INVALID;
if (mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);