diff options
Diffstat (limited to 'arch/s390/mm/pgtable.c')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index d56ef26d4681..463e5ef02304 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -275,6 +275,8 @@ void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, { pgste_t pgste; + if (!MACHINE_HAS_NX) + pte_val(pte) &= ~_PAGE_NOEXEC; if (mm_has_pgste(mm)) { pgste = pgste_get(ptep); pgste_set_key(ptep, pgste, pte, mm); @@ -606,12 +608,29 @@ void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep) bool test_and_clear_guest_dirty(struct mm_struct *mm, unsigned long addr) { spinlock_t *ptl; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; pgste_t pgste; pte_t *ptep; pte_t pte; bool dirty; - ptep = get_locked_pte(mm, addr, &ptl); + pgd = pgd_offset(mm, addr); + pud = pud_alloc(mm, pgd, addr); + if (!pud) + return false; + pmd = pmd_alloc(mm, pud, addr); + if (!pmd) + return false; + /* We can't run guests backed by huge pages, but userspace can + * still set them up and then try to migrate them without any + * migration support. + */ + if (pmd_large(*pmd)) + return true; + + ptep = pte_alloc_map_lock(mm, pmd, addr, &ptl); if (unlikely(!ptep)) return false; @@ -742,7 +761,7 @@ int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr) pgste_set_unlock(ptep, new); pte_unmap_unlock(ptep, ptl); - return 0; + return cc; } EXPORT_SYMBOL(reset_guest_reference_bit); |