Commit a72f0dbf authored Jul 12, 2008 by Jan Glauber Committed by Herbert Xu Jul 12, 2008

crypto: s390 - Respect STFL bit



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>

parent 3952f17e

arch/s390/crypto/crypt_s390.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);