Setting up the CP special message device driver

Red Hat Enterprise Linux 9.2 z/VM guest

Configure the CP special message device driver when you load the device driver module.

The z/VM user ID does not require special authorizations to receive CP special messages. CP special messages can be issued from the local z/VM guest virtual machine or from other guest virtual machines. You can issue special messages from Linux® or from a CMS or CP session.

Load the device driver module with the modprobe command.

smsgiucv_app syntax

Read syntax diagramSkip visual syntax diagrammodprobesmsgiucv_app sender= <user_ID>

Where:

sender = <user_ID>
permits CP special messages from the specified z/VM user ID only. CP special messages are discarded if the specified sender does not match the sender of the CP special message. If the sender= option is empty or not set, CP special messages are accepted from any z/VM user ID.

Lowercase characters are converted to uppercase.

To receive messages from several user IDs leave the sender= parameter empty, or do not specify it, and then filter with udev rules.

To load the smsgiucv_app module automatically at boot time, see the section on persistent module loading in Configuring basic system settings (https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/configuring_basic_system_settings/index).