s390x/mmu: Fix the exception codes for illegal table entries

Each different level of region/segment table has a dedicated
exception type for illegal entries.
Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: NJens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>

target-s390x/mmu_helper.c

@@ -178,9 +178,8 @@ static int mmu_translate_region(CPUS390XState *env, target_ulong vaddr,
                 __func__, origin, offs, new_entry);
 
     if ((new_entry & _REGION_ENTRY_INV) != 0) {
-        /* XXX different regions have different faults */
         DPRINTF("%s: invalid region\n", __func__);
-        trigger_page_fault(env, vaddr, PGM_SEGMENT_TRANS, asc, rw, exc);
+        trigger_page_fault(env, vaddr, pchks[level / 4], asc, rw, exc);
         return -1;
     }