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3270 devices
============
QEMU supports connecting an external 3270 terminal emulator (such as
``x3270``) to make a single 3270 device available to a guest. Note that this
supports basic features only.
To provide a 3270 device to a guest, create a ``x-terminal3270`` linked to
a ``tn3270`` chardev. The guest will see a 3270 channel device. In order
to actually be able to use it, attach the ``x3270`` emulator to the chardev.
Example configuration
---------------------
* Add a ``tn3270`` chardev and a ``x-terminal3270`` to the QEMU command line::
-chardev socket,id=char_0,host=0.0.0.0,port=2300,nowait,server,tn3270
-device x-terminal3270,chardev=char_0,devno=fe.0.000a,id=terminal_0
* Start the guest. In the guest, use ``chccwdev -e 0.0.000a`` to enable
the device.
* On the host, start the ``x3270`` emulator::
x3270 <host>:2300
* In the guest, locate the 3270 device node under ``/dev/3270/`` (say,
``tty1``) and start a getty on it::
systemctl start serial-getty@3270-tty1.service
This should get you an addtional tty for logging into the guest.
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