s390/mm: set change and reference bit on lazy key enablement

When we enable storage keys for a guest lazily, we reset the ACC and F
values. That is correct assuming that these are 0 on a clear reset and
the guest obviously has not used any key setting instruction.

We also zero out the change and reference bit. This is not correct as
the architecture prefers over-indication instead of under-indication
for the keyless->keyed transition.

This patch fixes the behaviour and always sets guest change and guest
reference for all guest storage keys on the keyless -> keyed switch.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index d4d409ba206b2e0f4ed0b88cc4f3a3ba125b3597..4a1f7366b17aeffacb6c766ab891227e2609f1b9 100644 (file)
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -591,11 +591,11 @@ void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
        unsigned long ptev;
        pgste_t pgste;
 
-       /* Clear storage key */
+       /* Clear storage key ACC and F, but set R/C */
        preempt_disable();
        pgste = pgste_get_lock(ptep);
-       pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT |
-                             PGSTE_GR_BIT | PGSTE_GC_BIT);
+       pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
+       pgste_val(pgste) |= PGSTE_GR_BIT | PGSTE_GC_BIT;
        ptev = pte_val(*ptep);
        if (!(ptev & _PAGE_INVALID) && (ptev & _PAGE_WRITE))
                page_set_storage_key(ptev & PAGE_MASK, PAGE_DEFAULT_KEY, 1);