Documentation/Platforms/S390X: Difference between revisions
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This command line will start a machine with the default SCLP VT220-compatible console. If you want any actual I/O devices, you need to add the respective virtio-*-ccw devices. | This command line will start a machine with the default SCLP VT220-compatible console. If you want any actual I/O devices, you need to add the respective virtio-*-ccw devices. | ||
== I/O devices == | |||
The virtio-ccw transport provides access to paravirtualized virtio devices. They are configured in a similar way to virtio-pci devices. For example, | |||
-drive file=/dev/dasdb,if=none,id=drive-virtio-disk0,format=raw,serial=ccwdasd1,cache=none -device virtio-blk-ccw,devno=fe.0.0001,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,scsi=off | |||
will add a virtio-blk device that uses the host disk /dev/dasdb as backing and is seen in the guest as the channel device 0.0.0001. | |||
Multiple subchannel sets are supported. For example, | |||
-device virtio-balloon-ccw,devno=fe.1.0101 | |||
will add a virtio-ballon device that the guest sees as the channel device 0.1.0101. | |||
== Maintainers == | == Maintainers == | ||
Revision as of 18:35, 9 November 2016
QEMU s390x Guest Support
QEMU supports running s390x (aka zSystems aka mainframe) guests via the s390-virtio-ccw machine, with kvm or tcg acceleration.
Supported Devices
The s390-virtio-ccw machine emulates a virtual channel subsystem. Currently, only virtio-ccw proxy devices (for most virtio device types) are supported.
As a console device, supported types are SCLP VT220-compatible (preferred), SCLP line-mode or virtio-serial console.
Guest Operating Systems
Currently, the only supported guest operation system is Linux.
When using kvm, you should be able to use any recent distribution that you would be able to run on your host as well (RHEL, SLES, Ubuntu, Debian, Fedora). Older versions may not yet support virtio-ccw.
When using tcg, the machine emulated is at an older level not supported on any of the recent enterprise distributions. Your best bet is probably using Debian.
Minimal command-line
qemu-system-s390x -M s390-ccw-virtio -kernel <kernel file name> -initrd <initrd file name> -m 512 -nographic
This command line will start a machine with the default SCLP VT220-compatible console. If you want any actual I/O devices, you need to add the respective virtio-*-ccw devices.
I/O devices
The virtio-ccw transport provides access to paravirtualized virtio devices. They are configured in a similar way to virtio-pci devices. For example,
-drive file=/dev/dasdb,if=none,id=drive-virtio-disk0,format=raw,serial=ccwdasd1,cache=none -device virtio-blk-ccw,devno=fe.0.0001,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,scsi=off
will add a virtio-blk device that uses the host disk /dev/dasdb as backing and is seen in the guest as the channel device 0.0.0001.
Multiple subchannel sets are supported. For example,
-device virtio-balloon-ccw,devno=fe.1.0101
will add a virtio-ballon device that the guest sees as the channel device 0.1.0101.
Maintainers
TCG (non-KVM)
Richard Henderson rth@twiddle.net
Alexander Graf agraf@suse.de
KVM and virtio-ccw
Christian Borntraeger borntraeger@de.ibm.com
Cornelia Huck cornelia.huck@de.ibm.com
Alexander Graf agraf@suse.de
Links
Wikipedia page for the System 390
Installing Ubuntu Linux
Installing SUSE Linux
Installing s390x emulator for Ubuntu
Debian S/390 port
Fedora s390x port