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s390x/tcg: fix loading 31bit PSWs with the highest bit set 

Let's also put the 31-bit hack in front of the REAL MMU, otherwise right
now we get errors when loading a PSW where the highest bit is set (e.g.
via s390-netboot.img). The highest bit is not masked away, therefore we
inject addressing exceptions into the guest.

The proper fix will later be to do all address wrapping before accessing
the MMU - so we won't get any "wrong" entries in there (which makes
flushing also easier). But that will require more work (wrapping in
load_psw, wrapping when incrementing the PC, wrapping every memory
access).

This fixes the tests/pxe-test test.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180301120826.6847-1-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2018-03-01 13:08:26 +01:00 committed by Cornelia Huck
parent eae9f29130
commit be8b49de24
1 changed files with 4 additions and 0 deletions
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4
target/s390x/excp_helper.c
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@ -107,6 +107,10 @@ int s390_cpu_handle_mmu_fault(CPUState *cs, vaddr orig_vaddr, int size,
return 1;
}
} else if (mmu_idx == MMU_REAL_IDX) {
/* 31-Bit mode */
if (!(env->psw.mask & PSW_MASK_64)) {
vaddr &= 0x7fffffff;
}
if (mmu_translate_real(env, vaddr, rw, &raddr, &prot)) {
return 1;
}