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<section id="devices">
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<h1>3270 devices<a class="headerlink" href="#devices" title="Link to this heading"></a></h1>
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<p>The 3270 is the classic ‘green-screen’ console of the mainframes (see the
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<a class="reference external" href="https://en.wikipedia.org/wiki/IBM_3270">IBM 3270 Wikipedia article</a>).</p>
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<p>The 3270 data stream is not implemented within QEMU; the device only provides
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TN3270 (a telnet extension; see <a class="reference external" href="https://tools.ietf.org/html/rfc854">RFC 854</a>
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and <a class="reference external" href="https://tools.ietf.org/html/rfc1576">RFC 1576</a>) and leaves the heavy
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lifting to an external 3270 terminal emulator (such as <code class="docutils literal notranslate"><span class="pre">x3270</span></code>) to make a
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single 3270 device available to a guest. Note that this supports basic
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features only.</p>
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<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
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a <code class="docutils literal notranslate"><span class="pre">tn3270</span></code> chardev. The guest will see a 3270 channel device. In order
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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>
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<section id="example-configuration">
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<h2>Example configuration<a class="headerlink" href="#example-configuration" title="Link to this heading"></a></h2>
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<ul>
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<li><p>Make sure that 3270 support is enabled in the guest’s Linux kernel. You need
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<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
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ttys) or <code class="docutils literal notranslate"><span class="pre">CONFIG_TN3270_CONSOLE</span></code> (for a 3270 console).</p></li>
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<li><p>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>
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<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">0.0.0.0</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>
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<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="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>
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</pre></div>
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</div>
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</li>
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<li><p>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
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the device.</p></li>
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<li><p>On the host, start the <code class="docutils literal notranslate"><span class="pre">x3270</span></code> emulator:</p>
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<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>
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</pre></div>
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</div>
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</li>
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<li><p>In the guest, locate the 3270 device node under <code class="docutils literal notranslate"><span class="pre">/dev/3270/</span></code> (say,
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<code class="docutils literal notranslate"><span class="pre">tty1</span></code>) and start a getty on it:</p>
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<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="o">@</span><span class="mi">3270</span><span class="o">-</span><span class="n">tty1</span><span class="o">.</span><span class="n">service</span>
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</pre></div>
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</div>
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<p>This should get you an additional tty for logging into the guest.</p>
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</li>
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<li><p>If you want to use the 3270 device as the Linux kernel console instead of
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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
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the guest’s kernel command line. The kernel then should use the 3270 as
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console after the next boot.</p></li>
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</ul>
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</section>
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<section id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Link to this heading"></a></h2>
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<p>3270 support is very basic. In particular:</p>
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<ul class="simple">
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<li><p>Only one 3270 device is supported.</p></li>
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<li><p>It has only been tested with Linux guests and the x3270 emulator.</p></li>
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<li><p>TLS/SSL is not supported.</p></li>
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<li><p>Resizing on reattach is not supported.</p></li>
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<li><p>Multiple commands in one inbound buffer (for example, when the reset key
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is pressed while the network is slow) are not supported.</p></li>
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</ul>
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