From b4ecbf8071022a2042624baaff78cab2bf7e94af Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@linux.vnet.ibm.com>
Date: Thu, 12 Feb 2015 18:09:28 +0100
Subject: s390x/mmu: Check bit 52 in page table entry

Bit 52 in a page table entry has always to be zero, or a translation
specification exception is to be recognized.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 target-s390x/mmu_helper.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'target-s390x/mmu_helper.c')

diff --git a/target-s390x/mmu_helper.c b/target-s390x/mmu_helper.c
index 7dc9900e73..c183958787 100644
--- a/target-s390x/mmu_helper.c
+++ b/target-s390x/mmu_helper.c
@@ -112,7 +112,10 @@ static int mmu_translate_pte(CPUS390XState *env, target_ulong vaddr,
         trigger_page_fault(env, vaddr, PGM_PAGE_TRANS, asc, rw, exc);
         return -1;
     }
-
+    if (pt_entry & _PAGE_RES0) {
+        trigger_page_fault(env, vaddr, PGM_TRANS_SPEC, asc, rw, exc);
+        return -1;
+    }
     if (pt_entry & _PAGE_RO) {
         *flags &= ~PAGE_WRITE;
     }
-- 
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