/* Embedded type MMU with HW exec support. This is a bit more complicated
* as we don't have two bits to spare for _PAGE_EXEC and _PAGE_HWEXEC so
* instead we "filter out" the exec permission for non clean pages.
+ *
+ * This is also called once for the folio. So only work with folio->flags here.
*/
- static inline pte_t set_pte_filter(pte_t pte)
+ static inline pte_t set_pte_filter(pte_t pte, unsigned long addr)
{
struct folio *folio;
/* Note: mm->context.id might not yet have been assigned as
* this context might not have been activated yet when this
- * is called.
+ * is called. Filter the pte value and use the filtered value
+ * to setup all the ptes in the range.
*/
- pte = set_pte_filter(pte);
+ pte = set_pte_filter(pte, addr);
- /* Perform the setting of the PTE */
- arch_enter_lazy_mmu_mode();
+ /*
+ * We don't need to call arch_enter/leave_lazy_mmu_mode()
+ * because we expect set_ptes to be only be used on not present
+ * and not hw_valid ptes. Hence there is no translation cache flush
+ * involved that need to be batched.
+ */
for (;;) {
+
+ /*
+ * Make sure hardware valid bit is not set. We don't do
+ * tlb flush for this update.
+ */
+ VM_WARN_ON(pte_hw_valid(*ptep) && !pte_protnone(*ptep));
+
+ /* Perform the setting of the PTE */
__set_pte_at(mm, addr, ptep, pte, 0);
if (--nr == 0)
break;