What is the use of z90crypt device driver ?

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Issue

What is the use of z90crypt device driver ?
Which kernel version support Crypto Express 4 (CEX4) adapter card ?
How to load and unload z90crypt device driver for Crypto Express 4 (CEX4) adapter card ?

Environment

Red Hat Enterprise Linux 6 (s390/s390x)
Crypto Express 4 (CEX4) adapter card
z90crypt

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