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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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1
target-s390x/cpu.h
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@ -853,6 +853,7 @@ struct sysib_322 {
#define _PAGE_RO 0x200 /* HW read-only bit */
#define _PAGE_INVALID 0x400 /* HW invalid bit */
#define _PAGE_RES0 0x800 /* bit must be zero */
#define SK_C (0x1 << 1)
#define SK_R (0x1 << 2)

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;
}