entry = *ptep;
if ((pte_val(entry) & (_PAGE_INVALID | _PAGE_RO)) == 0) {
pgste = pgste_get_lock(ptep);
- pgste_val(pgste) |= RCP_IN_BIT;
+ pgste_val(pgste) |= PGSTE_IN_BIT;
pgste_set_unlock(ptep, pgste);
start += PAGE_SIZE;
len -= PAGE_SIZE;
__free_page(page);
}
+int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
+ unsigned long key, bool nq)
+{
+ spinlock_t *ptl;
+ pgste_t old, new;
+ pte_t *ptep;
+
+ down_read(&mm->mmap_sem);
+ ptep = get_locked_pte(current->mm, addr, &ptl);
+ if (unlikely(!ptep)) {
+ up_read(&mm->mmap_sem);
+ return -EFAULT;
+ }
+
+ new = old = pgste_get_lock(ptep);
+ pgste_val(new) &= ~(PGSTE_GR_BIT | PGSTE_GC_BIT |
+ PGSTE_ACC_BITS | PGSTE_FP_BIT);
+ pgste_val(new) |= (key & (_PAGE_CHANGED | _PAGE_REFERENCED)) << 48;
+ pgste_val(new) |= (key & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
+ if (!(pte_val(*ptep) & _PAGE_INVALID)) {
+ unsigned long address, bits;
+ unsigned char skey;
+
+ address = pte_val(*ptep) & PAGE_MASK;
+ skey = page_get_storage_key(address);
+ bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
+ /* Set storage key ACC and FP */
+ page_set_storage_key(address,
+ (key & (_PAGE_ACC_BITS | _PAGE_FP_BIT)),
+ !nq);
+
+ /* Merge host changed & referenced into pgste */
+ pgste_val(new) |= bits << 52;
+ /* Transfer skey changed & referenced bit to kvm user bits */
+ pgste_val(new) |= bits << 45; /* PGSTE_UR_BIT & PGSTE_UC_BIT */
+ }
+ /* changing the guest storage key is considered a change of the page */
+ if ((pgste_val(new) ^ pgste_val(old)) &
+ (PGSTE_ACC_BITS | PGSTE_FP_BIT | PGSTE_GR_BIT | PGSTE_GC_BIT))
+ pgste_val(new) |= PGSTE_UC_BIT;
+
+ pgste_set_unlock(ptep, new);
+ pte_unmap_unlock(*ptep, ptl);
+ up_read(&mm->mmap_sem);
+ return 0;
+}
+EXPORT_SYMBOL(set_guest_storage_key);
+
#else /* CONFIG_PGSTE */
static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm,