The "hvc_iucv_allow=" kernel parameter specifies a comma-separated list
of z/VM user IDs that are permitted to connect to the z/VM IUCV hypervisor
device driver.
The z/VM user IDs in the list must not exceed eight characters and must
not contain spaces.
User response
Correct the "hvc_iucv_allow=" setting in the kernel parameter line and reboot
Linux.