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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>Guest Loader — 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="QEMU Barrier Client" href="barrier.html" /> <link rel="prev" title="Generic Loader" href="generic-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 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 class="reference internal" href="quickstart.html">Quick 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class="toctree-l2 current"><a class="current reference internal" href="#">Guest Loader</a><ul> <li class="toctree-l3"><a class="reference internal" href="#arguments">Arguments</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="barrier.html">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" 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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>Guest Loader</li> <li class="wy-breadcrumbs-aside"> <a href="https://gitlab.com/qemu-project/qemu/blob/master/docs/system/guest-loader.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="guest-loader"> <h1>Guest Loader<a class="headerlink" href="#guest-loader" title="Permalink to this headline">¶</a></h1> <p>The guest loader is similar to the <code class="docutils literal notranslate"><span class="pre">generic-loader</span></code> although it is aimed at a particular use case of loading hypervisor guests. This is useful for debugging hypervisors without having to jump through the hoops of firmware and boot-loaders.</p> <p>The guest loader does two things:</p> <blockquote> <div><ul class="simple"> <li>load blobs (kernels and initial ram disks) into memory</li> <li>sets platform FDT data so hypervisors can find and boot them</li> </ul> </div></blockquote> <p>This is what is typically done by a boot-loader like grub using it’s multi-boot capability. A typical example would look like:</p> <pre class="literal-block"> qemu-kvm -kernel ~/xen.git/xen/xen -append "dom0_mem=1G,max:1G loglvl=all guest_loglvl=all" -device guest-loader,addr=0x42000000,kernel=Image,bootargs="root=/dev/sda2 ro console=hvc0 earlyprintk=xen" -device guest-loader,addr=0x47000000,initrd=rootfs.cpio </pre> <p>In the above example the Xen hypervisor is loaded by the -kernel parameter and passed it’s boot arguments via -append. The Dom0 guest is loaded into the areas of memory. Each blob will get <code class="docutils literal notranslate"><span class="pre">/chosen/module@<addr></span></code> entry in the FDT to indicate it’s location and size. Additional information can be passed with by using additional arguments.</p> <p>Currently the only supported machines which use FDT data to boot are the ARM and RiscV <code class="docutils literal notranslate"><span class="pre">virt</span></code> machines.</p> <div class="section" id="arguments"> <h2>Arguments<a class="headerlink" href="#arguments" title="Permalink to this headline">¶</a></h2> <p>The full syntax of the guest-loader is:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">device</span> <span class="n">guest</span><span class="o">-</span><span class="n">loader</span><span class="p">,</span><span class="n">addr</span><span class="o">=<</span><span class="n">addr</span><span class="o">></span><span class="p">[,</span><span class="n">kernel</span><span class="o">=<</span><span class="n">file</span><span class="o">></span><span class="p">,[</span><span class="n">bootargs</span><span class="o">=<</span><span class="n">args</span><span class="o">></span><span class="p">]][,</span><span class="n">initrd</span><span class="o">=<</span><span class="n">file</span><span class="o">></span><span class="p">]</span> </pre></div> </div> <dl class="docutils"> <dt><code class="docutils literal notranslate"><span class="pre">addr=<addr></span></code></dt> <dd>This is mandatory and indicates the start address of the blob.</dd> <dt><code class="docutils literal notranslate"><span class="pre">kernel|initrd=<file></span></code></dt> <dd>Indicates the filename of the kernel or initrd blob. Both blobs will have the “multiboot,module” compatibility string as well as “multiboot,kernel” or “multiboot,ramdisk” as appropriate.</dd> <dt><code class="docutils literal notranslate"><span class="pre">bootargs=<args></span></code></dt> <dd>This is an optional field for kernel blobs which will pass command like via the <code class="docutils literal notranslate"><span class="pre">/chosen/module@<addr>/bootargs</span></code> node.</dd> </dl> </div> </div> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="barrier.html" class="btn btn-neutral float-right" title="QEMU Barrier Client" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="generic-loader.html" class="btn btn-neutral" title="Generic 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 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>