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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>QEMU Barrier Client — 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="VNC security" href="vnc-security.html" /> <link rel="prev" title="Guest Loader" href="guest-loader.html" /> <script src="../_static/js/modernizr.min.js"></script> </head> <body class="wy-body-for-nav"> <div class="wy-grid-for-nav"> <nav data-toggle="wy-nav-shift" class="wy-nav-side"> <div 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class="toctree-l2"><a class="reference internal" href="guest-loader.html">Guest Loader</a></li> <li class="toctree-l2 current"><a class="current reference internal" href="#">QEMU Barrier Client</a></li> <li class="toctree-l2"><a class="reference internal" href="vnc-security.html">VNC security</a></li> <li class="toctree-l2"><a class="reference internal" href="tls.html">TLS setup for network services</a></li> <li class="toctree-l2"><a class="reference internal" href="secrets.html">Providing secret data to QEMU</a></li> <li class="toctree-l2"><a class="reference internal" href="authz.html">Client authorization</a></li> <li class="toctree-l2"><a class="reference internal" href="gdb.html">GDB usage</a></li> <li class="toctree-l2"><a class="reference internal" href="managed-startup.html">Managed start up options</a></li> <li class="toctree-l2"><a class="reference internal" href="bootindex.html">Managing device boot order with bootindex properties</a></li> <li class="toctree-l2"><a 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<li class="toctree-l1"><a class="reference internal" href="../devel/index.html">Developer Information</a></li> </ul> </div> </div> </nav> <section 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>QEMU Barrier Client</li> <li class="wy-breadcrumbs-aside"> <a href="https://gitlab.com/qemu-project/qemu/blob/master/docs/system/barrier.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="qemu-barrier-client"> <h1>QEMU Barrier Client<a class="headerlink" href="#qemu-barrier-client" title="Permalink to this headline">¶</a></h1> <p>Generally, mouse and keyboard are grabbed through the QEMU video interface emulation.</p> <p>But when we want to use a video graphic adapter via a PCI passthrough there is no way to provide the keyboard and mouse inputs to the VM except by plugging a second set of mouse and keyboard to the host or by installing a KVM software in the guest OS.</p> <p>The QEMU Barrier client avoids this by implementing directly the Barrier protocol into QEMU.</p> <p><a class="reference external" href="https://github.com/debauchee/barrier">Barrier</a> is a KVM (Keyboard-Video-Mouse) software forked from Symless’s synergy 1.9 codebase.</p> <p>This protocol is enabled by adding an input-barrier object to QEMU.</p> <p>Syntax:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="nb">input</span><span class="o">-</span><span class="n">barrier</span><span class="p">,</span><span class="nb">id</span><span class="o">=<</span><span class="nb">object</span><span class="o">-</span><span class="nb">id</span><span class="o">></span><span class="p">,</span><span class="n">name</span><span class="o">=<</span><span class="n">guest</span> <span class="n">display</span> <span class="n">name</span><span class="o">></span> <span class="p">[,</span><span class="n">server</span><span class="o">=<</span><span class="n">barrier</span> <span class="n">server</span> <span class="n">address</span><span class="o">></span><span class="p">][,</span><span class="n">port</span><span class="o">=<</span><span class="n">barrier</span> <span class="n">server</span> <span class="n">port</span><span class="o">></span><span class="p">]</span> <span class="p">[,</span><span class="n">x</span><span class="o">-</span><span class="n">origin</span><span class="o">=<</span><span class="n">x</span><span class="o">-</span><span class="n">origin</span><span class="o">></span><span class="p">][,</span><span class="n">y</span><span class="o">-</span><span class="n">origin</span><span class="o">=<</span><span class="n">y</span><span class="o">-</span><span class="n">origin</span><span class="o">></span><span class="p">]</span> <span class="p">[,</span><span class="n">width</span><span class="o">=<</span><span class="n">width</span><span class="o">></span><span class="p">][,</span><span class="n">height</span><span class="o">=<</span><span class="n">height</span><span class="o">></span><span class="p">]</span> </pre></div> </div> <p>The object can be added on the QEMU command line, for instance with:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="nb">object</span> <span class="nb">input</span><span class="o">-</span><span class="n">barrier</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">barrier0</span><span class="p">,</span><span class="n">name</span><span class="o">=</span><span class="n">VM</span><span class="o">-</span><span class="mi">1</span> </pre></div> </div> <p>where VM-1 is the name the display configured in the Barrier server on the host providing the mouse and the keyboard events.</p> <p>by default <code class="docutils literal notranslate"><span class="pre"><barrier</span> <span class="pre">server</span> <span class="pre">address></span></code> is <code class="docutils literal notranslate"><span class="pre">localhost</span></code>, <code class="docutils literal notranslate"><span class="pre"><port></span></code> is <code class="docutils literal notranslate"><span class="pre">24800</span></code>, <code class="docutils literal notranslate"><span class="pre"><x-origin></span></code> and <code class="docutils literal notranslate"><span class="pre"><y-origin></span></code> are set to <code class="docutils literal notranslate"><span class="pre">0</span></code>, <code class="docutils literal notranslate"><span class="pre"><width></span></code> and <code class="docutils literal notranslate"><span class="pre"><height></span></code> to <code class="docutils literal notranslate"><span class="pre">1920</span></code> and <code class="docutils literal notranslate"><span class="pre">1080</span></code>.</p> <p>If the Barrier server is stopped QEMU needs to be reconnected manually, by removing and re-adding the input-barrier object, for instance with the help of the HMP monitor:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">(</span><span class="n">qemu</span><span class="p">)</span> <span class="n">object_del</span> <span class="n">barrier0</span> <span class="p">(</span><span class="n">qemu</span><span class="p">)</span> <span class="n">object_add</span> <span class="nb">input</span><span class="o">-</span><span class="n">barrier</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">barrier0</span><span class="p">,</span><span class="n">name</span><span class="o">=</span><span class="n">VM</span><span class="o">-</span><span class="mi">1</span> </pre></div> </div> </div> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="vnc-security.html" class="btn btn-neutral float-right" title="VNC security" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="guest-loader.html" class="btn btn-neutral" title="Guest Loader" 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 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