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s390x/mmu: Check bit 52 in page table entry

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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>
This commit is contained in:
Thomas Huth 2015-02-12 18:09:28 +01:00 • committed by Christian Borntraeger
parent ede5985578
commit b4ecbf8071
2 changed files with 5 additions and 1 deletions
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5
target-s390x/mmu_helper.c
View file

@ -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;
}