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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>Direct Linux Boot — 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="Generic Loader" href="generic-loader.html" /> <link rel="prev" title="QEMU virtio-net standby (net_failover)" href="virtio-net-failover.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 class="wy-side-scroll"> <div class="wy-side-nav-search"> <a href="../index.html" class="icon icon-home"> QEMU <img src="../_static/qemu_128x128.png" class="logo" alt="Logo"/> </a> <div class="version"> 6.2.0 </div> <div role="search"> <form id="rtd-search-form" class="wy-form" action="../search.html" method="get"> <input type="text" name="q" placeholder="Search docs" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation"> <p class="caption"><span class="caption-text">Contents:</span></p> <ul class="current"> <li class="toctree-l1"><a class="reference internal" href="../about/index.html">About QEMU</a></li> <li class="toctree-l1 current"><a class="reference internal" href="index.html">System Emulation</a><ul class="current"> <li class="toctree-l2"><a 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properties</a></li> <li class="toctree-l2"><a class="reference internal" href="cpu-hotplug.html">Virtual CPU hotplug</a></li> <li class="toctree-l2"><a class="reference internal" href="pr-manager.html">Persistent reservation managers</a></li> <li class="toctree-l2"><a class="reference internal" href="targets.html">QEMU System Emulator Targets</a></li> <li class="toctree-l2"><a class="reference internal" href="security.html">Security</a></li> <li class="toctree-l2"><a class="reference internal" href="multi-process.html">Multi-process QEMU</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="../user/index.html">User Mode Emulation</a></li> <li class="toctree-l1"><a class="reference internal" href="../tools/index.html">Tools</a></li> <li class="toctree-l1"><a class="reference internal" href="../interop/index.html">System Emulation Management and Interoperability</a></li> <li class="toctree-l1"><a class="reference internal" href="../specs/index.html">System Emulation Guest Hardware Specifications</a></li> <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>Direct Linux Boot</li> <li class="wy-breadcrumbs-aside"> <a href="https://gitlab.com/qemu-project/qemu/blob/master/docs/system/linuxboot.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="direct-linux-boot"> <span id="direct-005flinux-005fboot"></span><h1>Direct Linux Boot<a class="headerlink" href="#direct-linux-boot" title="Permalink to this headline">ΒΆ</a></h1> <p>This section explains how to launch a Linux kernel inside QEMU without having to make a full bootable image. It is very useful for fast Linux kernel testing.</p> <p>The syntax is:</p> <pre class="literal-block"> qemu-kvm -kernel bzImage -hda rootdisk.img -append "root=/dev/hda" </pre> <p>Use <code class="docutils literal notranslate"><span class="pre">-kernel</span></code> to provide the Linux kernel image and <code class="docutils literal notranslate"><span class="pre">-append</span></code> to give the kernel command line arguments. The <code class="docutils literal notranslate"><span class="pre">-initrd</span></code> option can be used to provide an INITRD image.</p> <p>If you do not need graphical output, you can disable it and redirect the virtual serial port and the QEMU monitor to the console with the <code class="docutils literal notranslate"><span class="pre">-nographic</span></code> option. The typical command line is:</p> <pre class="literal-block"> qemu-kvm -kernel bzImage -hda rootdisk.img -append "root=/dev/hda console=ttyS0" -nographic </pre> <p>Use Ctrl-a c to switch between the serial console and the monitor (see <a class="reference internal" href="keys.html#pcsys-005fkeys"><span class="std std-ref">Keys in the graphical frontends</span></a>).</p> </div> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="generic-loader.html" class="btn btn-neutral float-right" title="Generic Loader" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="virtio-net-failover.html" class="btn btn-neutral" title="QEMU virtio-net standby (net_failover)" 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>