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s390x/tcg: fix ignoring bit 63 when setting the storage key in SSKE 

Right now we could set an 8-bit storage key via SSKE and retrieve it
again via ISKE, which is against the architecture description:

SSKE:
"
The new seven-bit storage-key value, or selected bits
thereof, is obtained from bit positions 56-62 of gen-
eral register R 1 . The contents of bit positions 0-55
and 63 of the register are ignored.
"

ISKE:
"
The seven-bit storage key is inserted in bit positions
56-62 of general register R 1 , and bit 63 is set to zero.
"

Let's properly ignore bit 63 to create the correct seven-bit storage key.

Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210903155514.44772-3-david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
David Hildenbrand 2021-09-03 17:55:03 +02:00 committed by Thomas Huth
parent 634a0b51cb
commit fe00c705fe
1 changed files with 1 additions and 1 deletions
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2
target/s390x/tcg/mem_helper.c
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@ -2210,7 +2210,7 @@ void HELPER(sske)(CPUS390XState *env, uint64_t r1, uint64_t r2)
skeyclass = S390_SKEYS_GET_CLASS(ss);
}
key = (uint8_t) r1;
key = r1 & 0xfe;
skeyclass->set_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key);
/*
* As we can only flush by virtual address and not all the entries