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<!DOCTYPE html> <!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> <!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>3270 devices — QEMU qemu-kvm-6.2.0-53.module+el8.10.0+2055+8eb7870b.4 documentation</title> <link rel="shortcut icon" href="../../_static/qemu_32x32.png"/> <link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" /> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <link rel="index" title="Index" href="../../genindex.html" /> <link rel="search" title="Search" href="../../search.html" /> <link rel="next" title="Subchannel passthrough via vfio-ccw" href="vfio-ccw.html" /> <link rel="prev" title="The virtual channel subsystem" href="css.html" /> <script src="../../_static/js/modernizr.min.js"></script> </head> <body class="wy-body-for-nav"> <div class="wy-grid-for-nav"> <nav 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data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> <nav class="wy-nav-top" aria-label="top navigation"> <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../../index.html">QEMU</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="breadcrumbs navigation"> <ul class="wy-breadcrumbs"> <li><a href="../../index.html">Docs</a> »</li> <li><a href="../index.html">System Emulation</a> »</li> <li><a href="../targets.html">QEMU System Emulator Targets</a> »</li> <li><a href="../target-s390x.html">s390x System emulator</a> »</li> <li>3270 devices</li> <li class="wy-breadcrumbs-aside"> <a href="https://gitlab.com/qemu-project/qemu/blob/master/docs/system/s390x/3270.rst" class="fa fa-gitlab"> Edit on GitLab</a> </li> </ul> <hr/> </div> <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> <div itemprop="articleBody"> <div class="section" id="devices"> <h1>3270 devices<a class="headerlink" href="#devices" title="Permalink to this headline">¶</a></h1> <p>The 3270 is the classic ‘green-screen’ console of the mainframes (see the <a class="reference external" href="https://en.wikipedia.org/wiki/IBM_3270">IBM 3270 Wikipedia article</a>).</p> <p>The 3270 data stream is not implemented within QEMU; the device only provides TN3270 (a telnet extension; see <a class="reference external" href="https://tools.ietf.org/html/rfc854">RFC 854</a> and <a class="reference external" href="https://tools.ietf.org/html/rfc1576">RFC 1576</a>) and leaves the heavy lifting to an external 3270 terminal emulator (such as <code class="docutils literal notranslate"><span class="pre">x3270</span></code>) to make a single 3270 device available to a guest. Note that this supports basic features only.</p> <p>To provide a 3270 device to a guest, create a <code class="docutils literal notranslate"><span class="pre">x-terminal3270</span></code> linked to a <code class="docutils literal notranslate"><span class="pre">tn3270</span></code> chardev. The guest will see a 3270 channel device. In order to actually be able to use it, attach the <code class="docutils literal notranslate"><span class="pre">x3270</span></code> emulator to the chardev.</p> <div class="section" id="example-configuration"> <h2>Example configuration<a class="headerlink" href="#example-configuration" title="Permalink to this headline">¶</a></h2> <ul> <li><p class="first">Make sure that 3270 support is enabled in the guest’s Linux kernel. You need <code class="docutils literal notranslate"><span class="pre">CONFIG_TN3270</span></code> and at least one of <code class="docutils literal notranslate"><span class="pre">CONFIG_TN3270_TTY</span></code> (for additional ttys) or <code class="docutils literal notranslate"><span class="pre">CONFIG_TN3270_CONSOLE</span></code> (for a 3270 console).</p> </li> <li><p class="first">Add a <code class="docutils literal notranslate"><span class="pre">tn3270</span></code> chardev and a <code class="docutils literal notranslate"><span class="pre">x-terminal3270</span></code> to the QEMU command line:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">chardev</span> <span class="n">socket</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">ch0</span><span class="p">,</span><span class="n">host</span><span class="o">=</span><span class="mf">0.0</span><span class="o">.</span><span class="mf">0.0</span><span class="p">,</span><span class="n">port</span><span class="o">=</span><span class="mi">2300</span><span class="p">,</span><span class="n">wait</span><span class="o">=</span><span class="n">off</span><span class="p">,</span><span class="n">server</span><span class="o">=</span><span class="n">on</span><span class="p">,</span><span class="n">tn3270</span><span class="o">=</span><span class="n">on</span> <span class="o">-</span><span class="n">device</span> <span class="n">x</span><span class="o">-</span><span class="n">terminal3270</span><span class="p">,</span><span class="n">chardev</span><span class="o">=</span><span class="n">ch0</span><span class="p">,</span><span class="n">devno</span><span class="o">=</span><span class="n">fe</span><span class="o">.</span><span class="mf">0.000</span><span class="n">a</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">terminal0</span> </pre></div> </div> </li> <li><p class="first">Start the guest. In the guest, use <code class="docutils literal notranslate"><span class="pre">chccwdev</span> <span class="pre">-e</span> <span class="pre">0.0.000a</span></code> to enable the device.</p> </li> <li><p class="first">On the host, start the <code class="docutils literal notranslate"><span class="pre">x3270</span></code> emulator:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">x3270</span> <span class="o"><</span><span class="n">host</span><span class="o">></span><span class="p">:</span><span class="mi">2300</span> </pre></div> </div> </li> <li><p class="first">In the guest, locate the 3270 device node under <code class="docutils literal notranslate"><span class="pre">/dev/3270/</span></code> (say, <code class="docutils literal notranslate"><span class="pre">tty1</span></code>) and start a getty on it:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">systemctl</span> <span class="n">start</span> <span class="n">serial</span><span class="o">-</span><span class="n">getty</span><span class="nd">@3270</span><span class="o">-</span><span class="n">tty1</span><span class="o">.</span><span class="n">service</span> </pre></div> </div> <p>This should get you an additional tty for logging into the guest.</p> </li> <li><p class="first">If you want to use the 3270 device as the Linux kernel console instead of an additional tty, you can also append <code class="docutils literal notranslate"><span class="pre">conmode=3270</span> <span class="pre">condev=000a</span></code> to the guest’s kernel command line. The kernel then should use the 3270 as console after the next boot.</p> </li> </ul> </div> <div class="section" id="restrictions"> <h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2> <p>3270 support is very basic. In particular:</p> <ul class="simple"> <li>Only one 3270 device is supported.</li> <li>It has only been tested with Linux guests and the x3270 emulator.</li> <li>TLS/SSL is not supported.</li> <li>Resizing on reattach is not supported.</li> <li>Multiple commands in one inbound buffer (for example, when the reset key is pressed while the network is slow) are not supported.</li> </ul> </div> </div> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="vfio-ccw.html" class="btn btn-neutral float-right" title="Subchannel passthrough via vfio-ccw" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="css.html" class="btn btn-neutral" title="The virtual channel subsystem" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a> </div> <hr/> <div role="contentinfo"> <p> © Copyright 2021, The QEMU Project Developers. </p> </div> Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/rtfd/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. <!-- Empty para to force a blank line after "Built with Sphinx ..." --> <p></p> <p>This documentation is for QEMU version 6.2.0.</p> <p><a href="../../about/license.html">QEMU and this manual are released under the GNU General Public License, version 2.</a></p> </footer> </div> </div> </section> </div> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT:'../../', VERSION:'qemu-kvm-6.2.0-53.module+el8.10.0+2055+8eb7870b.4', LANGUAGE:'None', COLLAPSE_INDEX:false, FILE_SUFFIX:'.html', HAS_SOURCE: false, SOURCELINK_SUFFIX: '.txt' }; </script> <script type="text/javascript" src="../../_static/jquery.js"></script> <script type="text/javascript" src="../../_static/underscore.js"></script> <script type="text/javascript" src="../../_static/doctools.js"></script> <script type="text/javascript" src="../../_static/js/theme.js"></script> <script type="text/javascript"> jQuery(function () { SphinxRtdTheme.Navigation.enable(true); }); </script> </body> </html>