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crypto: s390 - Respect STFL bit

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Bevore issuing any s390 crypto operation check whether the
CPACF facility is enabled in the facility list. That way a
virtualization layer can prevent usage of the CPACF facility
regardless of the availability of the crypto instructions.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jan Glauber 2008-07-12 15:42:11 +08:00 committed by Herbert Xu
parent 3952f17ed6
commit a72f0dbfd9
1 changed files with 4 additions and 0 deletions
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4
arch/s390/crypto/crypt_s390.h
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@ -296,6 +296,10 @@ static inline int crypt_s390_func_available(int func)
unsigned char status[16];
int ret;
/* check if CPACF facility (bit 17) is available */
if (!(stfl() & 1ULL << (31 - 17)))
return 0;
switch (func & CRYPT_S390_OP_MASK) {
case CRYPT_S390_KM:
ret = crypt_s390_km(KM_QUERY, &status, NULL, NULL, 0);