Setting up HVC terminal devicesEdit online Set up 1 - 8 HVC terminal devices, as required. You use kernel parameters to set up HVC terminal devices. See Device Drivers, Features, and Commands about how to include kernel parameters in a boot configuration. Specifying the number of HVC terminal devicesUse the hvc_iucv kernel parameter to specify the number of HVC terminal devices to be operational.Activating hvc0 to receive Linux kernel messagesUse the console kernel parameter to also activate hvc0 to receive Linux™ kernel messages. Restricting access to HVC terminal devicesYou can set a filter that restricts which z/VM® guest virtual machines can connect to the z/VM® IUCV HVC device driver and access HVC terminal devices.Permitting root loginsThe default login program for HVC terminal devices, /bin/login, restricts root logins.Enabling user loginsDepending on your distribution, you need an Upstart job file or an entry in /etc/inittab to facilitate user logins on a terminal device.Parent topic: Setting up the target systemsRelated informationDevice Drivers, Features, and Commands