From b4ecbf8071022a2042624baaff78cab2bf7e94af Mon Sep 17 00:00:00 2001 From: Thomas Huth 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 Signed-off-by: Jens Freimann Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- target-s390x/cpu.h | 1 + target-s390x/mmu_helper.c | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'target-s390x') diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h index 08cdb1529..c24ca5f7f 100644 --- a/target-s390x/cpu.h +++ b/target-s390x/cpu.h @@ -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) diff --git a/target-s390x/mmu_helper.c b/target-s390x/mmu_helper.c index 7dc9900e7..c18395878 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; } -- cgit v1.2.3