Preparing DASD pass-through devices

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To make a DASD device eligible as a VFIO pass-through device, you must bring its subchannel under control of the vfio_ccw device driver and you must create a mediated device for the DASD.

For a mediated device that persists across reboots of the KVM host, you must perform the following tasks on the host.

Persistently assign the DASD's subchannel to the vfio_ccw device driver: Persistently bring the DASDs CCW device under control of the vfio_ccw device driver, by using the driverctl command, see Assign the DASD's subchannel to the vfio_ccw device driver.
Create a persistent mediated device and configure it as an autostart device: Create a persistent mediated device for the DASD by using the virsh nodedev-define command. Include this persistent mediated device in the host's autostart configuration with the virsh nodedev-autostart command. See Creating a mediated device for a DASD pass-through device.