Accessing cryptographic devices
The cryptographic device driver registers as a misc device and provides a default device node to user space.
In Red Hat® Enterprise Linux® 8.6, udev creates the device node /dev/z90crypt for you. The device node is assigned to the miscellaneous devices.
The /dev/z90crypt device node provides unrestricted user space access to a device that represents all AP queues that are available to the Linux instance.
You can create customized device nodes that represent subsets of AP queues and functions, see Creating customized device nodes.