aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/crypto
diff options
context:
space:
mode:
authorJan Glauber <jang@linux.vnet.ibm.com>2008-07-12 15:42:11 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-07-12 15:42:11 +0800
commita72f0dbfd93159acdf2467e5a022b28f763061f6 (patch)
tree62bb51c0ab16dbd7df39c34026c2f0a66ce3cd0c /arch/s390/crypto
parent3952f17ed63434cc2154c3765ff97e1d4adab042 (diff)
downloadlinux-linaro-android-a72f0dbfd93159acdf2467e5a022b28f763061f6.tar.gz
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>
Diffstat (limited to 'arch/s390/crypto')
-rw-r--r--arch/s390/crypto/crypt_s390.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/crypto/crypt_s390.h b/arch/s390/crypto/crypt_s390.h
index 9992f95ef99..0ef9829f2ad 100644
--- a/arch/s390/crypto/crypt_s390.h
+++ b/arch/s390/crypto/crypt_s390.h
@@ -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);