-static inline unsigned long page_table_reset_pte(struct mm_struct *mm, pmd_t *pmd,
- unsigned long addr, unsigned long end, bool init_skey)
-{
- pte_t *start_pte, *pte;
- spinlock_t *ptl;
- pgste_t pgste;
-
- start_pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
- pte = start_pte;
- do {
- pgste = pgste_get_lock(pte);
- pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK;
- if (init_skey) {
- unsigned long address;
-
- pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT |
- PGSTE_GR_BIT | PGSTE_GC_BIT);
-
- /* skip invalid and not writable pages */
- if (pte_val(*pte) & _PAGE_INVALID ||
- !(pte_val(*pte) & _PAGE_WRITE)) {
- pgste_set_unlock(pte, pgste);
- continue;
- }
-
- address = pte_val(*pte) & PAGE_MASK;
- page_set_storage_key(address, PAGE_DEFAULT_KEY, 1);
- }
- pgste_set_unlock(pte, pgste);
- } while (pte++, addr += PAGE_SIZE, addr != end);
- pte_unmap_unlock(start_pte, ptl);
-
- return addr;
-}
-
-static inline unsigned long page_table_reset_pmd(struct mm_struct *mm, pud_t *pud,
- unsigned long addr, unsigned long end, bool init_skey)
-{
- unsigned long next;
- pmd_t *pmd;
-
- pmd = pmd_offset(pud, addr);
- do {
- next = pmd_addr_end(addr, end);
- if (pmd_none_or_clear_bad(pmd))
- continue;
- next = page_table_reset_pte(mm, pmd, addr, next, init_skey);
- } while (pmd++, addr = next, addr != end);
-
- return addr;
-}
-
-static inline unsigned long page_table_reset_pud(struct mm_struct *mm, pgd_t *pgd,
- unsigned long addr, unsigned long end, bool init_skey)
-{
- unsigned long next;
- pud_t *pud;
-
- pud = pud_offset(pgd, addr);
- do {
- next = pud_addr_end(addr, end);
- if (pud_none_or_clear_bad(pud))
- continue;
- next = page_table_reset_pmd(mm, pud, addr, next, init_skey);
- } while (pud++, addr = next, addr != end);
-
- return addr;
-}
-
-void page_table_reset_pgste(struct mm_struct *mm, unsigned long start,
- unsigned long end, bool init_skey)
-{
- unsigned long addr, next;
- pgd_t *pgd;
-
- down_write(&mm->mmap_sem);
- if (init_skey && mm_use_skey(mm))
- goto out_up;
- addr = start;
- pgd = pgd_offset(mm, addr);
- do {
- next = pgd_addr_end(addr, end);
- if (pgd_none_or_clear_bad(pgd))
- continue;
- next = page_table_reset_pud(mm, pgd, addr, next, init_skey);
- } while (pgd++, addr = next, addr != end);
- if (init_skey)
- current->mm->context.use_skey = 1;
-out_up:
- up_write(&mm->mmap_sem);
-}
-EXPORT_SYMBOL(page_table_reset_pgste);
-