Checking the adapter settings

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Use the lszcrypt command with the -b option to display information about the settings for your cryptographic adapters.


# lszcrypt -b
ap_domain=0x4
ap_max_domain_id=0x54
ap_interrupts are disabled
config_time=30 (seconds)
poll_thread is disabled
poll_timeout=1500000 (nanoseconds)
As seen in the example, the command output shows:
  • the used domain in hexadecimal notation
    Note: To change the domain you must unload the z90crypt module and reload it with the appropriate domain= module parameter. In installations with the in-kernel ap module and multi-domain support, you achieve this directly by changing the ap_domain value via sysfs.
  • whether ap interrupts are used
  • whether the polling thread is used and, if so, at which frequency
    Note: Polling threads cannot be enabled if ap interrupts are available.

If your distribution does not include the lszcrypt command, see the version of Device Drivers, Features, and Commands that applies to your distribution about how to use the sysfs interface to retrieve this information.