system/s390x/css.rst

5 functionless) channel paths, and channel devices (virtio-ccw, 3270, and
6 devices passed via vfio-ccw). It supports multiple subchannel sets (MSS) and
7 multiple channel subsystems extended (MCSS-E).
9 All channel devices support the ``devno`` property, which takes a parameter
12 The default channel subsystem image id (``<cssid>``) is ``0xfe``. Devices in
14 enable MCSS-E. Note that devices with a different cssid will not be visible
15 if the guest OS does not enable MCSS-E (which is true for all supported guest
18 Supported values for the subchannel set id (``<ssid>``) range from ``0-3``.
19 Devices with a ssid that is not ``0`` will not be visible if the guest OS
24 The device number can range from ``0-0xffff``.
36 --------
38 * a virtio-net device, cssid/ssid/devno automatically assigned::
40     -device virtio-net-ccw
42   In a Linux guest (without default devices and no other devices specified
46   The auto-assigned-properties in QEMU (as seen via e.g. ``info qtree``)
49 * a virtio-rng device in subchannel set ``0``::
51     -device virtio-rng-ccw,devno=fe.0.0042
59 * a virtio-gpu device in subchannel set ``2``::
61     -device virtio-gpu-ccw,devno=fe.2.1111
69 * a virtio-mouse device in a non-standard channel subsystem image::
71     -device virtio-mouse-ccw,devno=2.0.2222
78 * a virtio-keyboard device in another non-standard channel subsystem image::
80     -device virtio-keyboard-ccw,devno=0.0.1234