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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<!--
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This file is autogenerated from drvqemu.html.in
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Do not edit this file. Changes will be lost.
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<title>libvirt: QEMU/KVM hypervisor driver</title>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Front page of the libvirt website" class="inactive" href="index.html">Home</a>
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2008-07-08 17:44:56 +00:00
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<div>
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<a title="Details of new features and bugs fixed in each release" class="inactive" href="news.html">News</a>
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2008-07-08 17:44:56 +00:00
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<a title="Get the latest source releases, binary builds and get access to the source repository" class="inactive" href="downloads.html">Downloads</a>
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2008-07-08 17:44:56 +00:00
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<a title="Information about deploying and using libvirt" class="inactive" href="deployment.html">Deployment</a>
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2008-07-08 17:44:56 +00:00
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Overview of the logical subsystems in the libvirt API" class="inactive" href="intro.html">Architecture</a>
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2008-07-08 17:44:56 +00:00
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Description of the XML formats used in libvirt" class="inactive" href="format.html">XML format</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Hypervisor specific driver information" class="active" href="drivers.html">Drivers</a>
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<ul class="l2"><li>
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<div>
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<a title="Driver the Xen hypervisor" class="inactive" href="drvxen.html">Xen</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<span class="active">QEMU / KVM</span>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Driver for the Linux native container API" class="inactive" href="drvlxc.html">Linux Container</a>
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</div>
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2008-07-08 17:44:56 +00:00
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Psuedo-driver simulating APIs in memory for test suites" class="inactive" href="drvtest.html">Test</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Driver providing secure remote to the libvirt APIs" class="inactive" href="drvremote.html">Remote</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Driver for the OpenVZ container technology" class="inactive" href="drvopenvz.html">OpenVZ</a>
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</div>
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2008-11-21 12:54:51 +00:00
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</li><li>
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<div>
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<a title="Driver for the User Mode Linux technology" class="inactive" href="drvuml.html">UML</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Driver for the storage management APIs" class="inactive" href="storage.html">Storage</a>
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</div>
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2009-04-21 12:24:14 +00:00
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</li><li>
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<div>
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<a title="Driver for VirtualBox" class="inactive" href="drvvbox.html">VirtualBox</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li></ul>
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2008-04-25 16:23:51 +00:00
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Reference manual for the C public API" class="inactive" href="html/index.html">API reference</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Bindings of the libvirt API for other languages" class="inactive" href="bindings.html">Language bindings</a>
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</div>
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2009-06-09 11:42:41 +00:00
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</li><li>
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<div>
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<a title="Working on the internals of libvirt API, driver and daemon code" class="inactive" href="internals.html">Internals</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li></ul>
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2008-04-25 16:23:51 +00:00
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</div>
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="User contributed content" class="inactive" href="http://wiki.libvirt.org">Wiki</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Frequently asked questions" class="inactive" href="FAQ.html">FAQ</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="How and where to report bugs and request features" class="inactive" href="bugs.html">Bug reports</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="How to contact the developers via email and IRC" class="inactive" href="contact.html">Contact</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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2008-04-25 16:23:51 +00:00
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<div>
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<a title="Miscellaneous links of interest related to libvirt" class="inactive" href="relatedlinks.html">Related Links</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li><li>
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<div>
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<a title="Overview of all content on the website" class="inactive" href="sitemap.html">Sitemap</a>
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</div>
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2008-07-08 17:44:56 +00:00
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</li></ul>
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</div>
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2008-04-23 17:08:31 +00:00
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<div id="content">
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<h1>QEMU/KVM hypervisor driver</h1>
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2009-05-21 14:20:21 +00:00
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<ul><li>
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<a href="#prereq">Deployment pre-requisites</a>
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</li><li>
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<a href="#uris">Connections to QEMU driver</a>
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</li><li>
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<a href="#imex">Import and export of libvirt domain XML configs</a>
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<ul><li>
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<a href="#xmlimport">Converting from QEMU args to domain XML</a>
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</li><li>
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<a href="#xmlexport">Converting from domain XML to QEMU args</a>
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</li></ul>
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</li><li>
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<a href="#xmlconfig">Example domain XML config</a>
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</li></ul>
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2008-04-23 17:08:31 +00:00
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<p>
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The libvirt QEMU driver can manage any QEMU emulator from version 0.8.1
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or later. It can also manage anything that provides the same QEMU command
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line syntax and monitor interaction. This includes KVM, and Xenner.
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</p>
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2009-05-21 14:20:21 +00:00
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<h2>
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<a name="prereq" id="prereq">Deployment pre-requisites</a>
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</h2>
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2008-07-08 17:44:56 +00:00
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<ul><li>
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<strong>QEMU emulators</strong>: The driver will probe <code>/usr/bin</code>
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for the presence of <code>qemu</code>, <code>qemu-system-x86_64</code>,
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<code>qemu-system-mips</code>,<code>qemu-system-mipsel</code>,
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<code>qemu-system-sparc</code>,<code>qemu-system-ppc</code>. The results
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of this can be seen from the capabilities XML output.
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</li><li>
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<strong>KVM hypervisor</strong>: The driver will probe <code>/usr/bin</code>
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for the presence of <code>qemu-kvm</code> and <code>/dev/kvm</code> device
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node. If both are found, then KVM fullyvirtualized, hardware accelerated
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guests will be available.
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2008-07-08 17:44:56 +00:00
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</li><li>
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<strong>Xenner hypervisor</strong>: The driver will probe <code>/usr/bin</code>
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2008-04-23 17:08:31 +00:00
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for the presence of <code>xenner</code> and <code>/dev/kvm</code> device
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node. If both are found, then Xen paravirtualized guests can be run using
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the KVM hardware acceleration.
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2008-07-08 17:44:56 +00:00
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</li></ul>
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2009-05-21 14:20:21 +00:00
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<h2>
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<a name="uris" id="uris">Connections to QEMU driver</a>
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</h2>
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2009-01-27 14:49:09 +00:00
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<p>
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The libvirt QEMU driver is a multi-instance driver, providing a single
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system wide privileged driver (the "system" instance), and per-user
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unprivileged drivers (the "session" instance). The of the driver protocol
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is "qemu". Some example conection URIs for the libvirt driver are:
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</p>
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<pre>
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qemu:///session (local access to per-user instance)
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qemu+unix:///session (local access to per-user instance)
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qemu:///system (local access to system instance)
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qemu+unix:///system (local access to system instance)
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qemu://example.com/system (remote access, TLS/x509)
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qemu+tcp://example.com/system (remote access, SASl/Kerberos)
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qemu+ssh://root@example.com/system (remote access, SSH tunnelled)
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2009-05-21 14:20:21 +00:00
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</pre>
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<h2>
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<a name="imex" id="imex">Import and export of libvirt domain XML configs</a>
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</h2>
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<p>The QEMU driver currently supports a single native
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config format known as <code>qemu-argv</code>. The data for this format
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is expected to be a single line first a list of environment variables,
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then the QEMu binary name, finally followed by the QEMU command line
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arguments</p>
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<h3>
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<a name="xmlimport" id="xmlimport">Converting from QEMU args to domain XML</a>
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</h3>
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<p>
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The <code>virsh domxml-from-native</code> provides a way to convert an
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existing set of QEMU args into a guest description using libvirt Domain XML
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that can then be used by libvirt.
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</p>
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<pre>$ cat > demo.args <<EOF
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LC_ALL=C PATH=/bin HOME=/home/test USER=test \
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LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 \
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-nographic -monitor pty -no-acpi -boot c -hda \
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/dev/HostVG/QEMUGuest1 -net none -serial none \
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-parallel none -usb
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EOF
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$ virsh domxml-from-native qemu-argv demo.args
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<domain type='qemu'>
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<uuid>00000000-0000-0000-0000-000000000000</uuid>
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<memory>219136</memory>
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<currentMemory>219136</currentMemory>
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<vcpu>1</vcpu>
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<os>
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<type arch='i686' machine='pc'>hvm</type>
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<boot dev='hd'/>
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</os>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<emulator>/usr/bin/qemu</emulator>
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<disk type='block' device='disk'>
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<source dev='/dev/HostVG/QEMUGuest1'/>
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<target dev='hda' bus='ide'/>
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</disk>
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</devices>
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</domain>
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</pre>
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<p>NB, don't include the literral \ in the args, put everything on one line</p>
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<h3>
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<a name="xmlexport" id="xmlexport">Converting from domain XML to QEMU args</a>
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</h3>
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<p>
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The <code>virsh domxml-to-native</code> provides a way to convert a
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guest description using libvirt Domain XML, into a set of QEMU args
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that can be run manually.
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</p>
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<pre>$ cat > demo.xml <<EOF
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<domain type='qemu'>
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<name>QEMUGuest1</name>
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<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
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<memory>219200</memory>
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|
<currentMemory>219200</currentMemory>
|
|
|
|
|
<vcpu>1</vcpu>
|
|
|
|
|
<os>
|
|
|
|
|
<type arch='i686' machine='pc'>hvm</type>
|
|
|
|
|
<boot dev='hd'/>
|
|
|
|
|
</os>
|
|
|
|
|
<clock offset='utc'/>
|
|
|
|
|
<on_poweroff>destroy</on_poweroff>
|
|
|
|
|
<on_reboot>restart</on_reboot>
|
|
|
|
|
<on_crash>destroy</on_crash>
|
|
|
|
|
<devices>
|
|
|
|
|
<emulator>/usr/bin/qemu</emulator>
|
|
|
|
|
<disk type='block' device='disk'>
|
|
|
|
|
<source dev='/dev/HostVG/QEMUGuest1'/>
|
|
|
|
|
<target dev='hda' bus='ide'/>
|
|
|
|
|
</disk>
|
|
|
|
|
</devices>
|
|
|
|
|
</domain>
|
|
|
|
|
EOF
|
|
|
|
|
$ virsh domxml-to-native qemu-argv demo.xml
|
|
|
|
|
LC_ALL=C PATH=/usr/bin:/bin HOME=/home/test \
|
|
|
|
|
USER=test LOGNAME=test /usr/bin/qemu -S -M pc \
|
|
|
|
|
-no-kqemu -m 214 -smp 1 -name QEMUGuest1 -nographic \
|
|
|
|
|
-monitor pty -no-acpi -boot c -drive \
|
|
|
|
|
file=/dev/HostVG/QEMUGuest1,if=ide,index=0 -net none \
|
|
|
|
|
-serial none -parallel none -usb
|
2009-01-27 14:49:09 +00:00
|
|
|
</pre>
|
2008-04-23 17:08:31 +00:00
|
|
|
<h2>
|
|
|
|
|
<a name="xmlconfig" id="xmlconfig">Example domain XML config</a>
|
|
|
|
|
</h2>
|
|
|
|
|
<h3>QEMU emulated guest on x86_64</h3>
|
|
|
|
|
<pre><domain type='qemu'>
|
|
|
|
|
<name>QEmu-fedora-i686</name>
|
|
|
|
|
<uuid>c7a5fdbd-cdaf-9455-926a-d65c16db1809</uuid>
|
|
|
|
|
<memory>219200</memory>
|
|
|
|
|
<currentMemory>219200</currentMemory>
|
|
|
|
|
<vcpu>2</vcpu>
|
|
|
|
|
<os>
|
|
|
|
|
<type arch='i686' machine='pc'>hvm</type>
|
|
|
|
|
<boot dev='cdrom'/>
|
|
|
|
|
</os>
|
|
|
|
|
<devices>
|
|
|
|
|
<emulator>/usr/bin/qemu-system-x86_64</emulator>
|
|
|
|
|
<disk type='file' device='cdrom'>
|
|
|
|
|
<source file='/home/user/boot.iso'/>
|
|
|
|
|
<target dev='hdc'/>
|
|
|
|
|
<readonly/>
|
|
|
|
|
</disk>
|
|
|
|
|
<disk type='file' device='disk'>
|
|
|
|
|
<source file='/home/user/fedora.img'/>
|
|
|
|
|
<target dev='hda'/>
|
|
|
|
|
</disk>
|
|
|
|
|
<interface type='network'>
|
2008-07-08 17:44:56 +00:00
|
|
|
<source network='default'/>
|
2008-04-23 17:08:31 +00:00
|
|
|
</interface>
|
|
|
|
|
<graphics type='vnc' port='-1'/>
|
|
|
|
|
</devices>
|
|
|
|
|
</domain></pre>
|
|
|
|
|
<h3>KVM hardware accelerated guest on i686</h3>
|
|
|
|
|
<pre><domain type='kvm'>
|
|
|
|
|
<name>demo2</name>
|
|
|
|
|
<uuid>4dea24b3-1d52-d8f3-2516-782e98a23fa0</uuid>
|
|
|
|
|
<memory>131072</memory>
|
|
|
|
|
<vcpu>1</vcpu>
|
|
|
|
|
<os>
|
|
|
|
|
<type arch="i686">hvm</type>
|
|
|
|
|
</os>
|
|
|
|
|
<clock sync="localtime"/>
|
|
|
|
|
<devices>
|
|
|
|
|
<emulator>/usr/bin/qemu-kvm</emulator>
|
|
|
|
|
<disk type='file' device='disk'>
|
|
|
|
|
<source file='/var/lib/libvirt/images/demo2.img'/>
|
|
|
|
|
<target dev='hda'/>
|
|
|
|
|
</disk>
|
|
|
|
|
<interface type='network'>
|
|
|
|
|
<source network='default'/>
|
|
|
|
|
<mac address='24:42:53:21:52:45'/>
|
|
|
|
|
</interface>
|
2009-01-06 08:48:48 +00:00
|
|
|
<graphics type='vnc' port='-1' keymap='de'/>
|
2008-04-23 17:08:31 +00:00
|
|
|
</devices>
|
|
|
|
|
</domain></pre>
|
|
|
|
|
<h3>Xen paravirtualized guests with hardware acceleration</h3>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
<div id="footer">
|
2008-04-28 08:29:35 +00:00
|
|
|
<p id="sponsor">
|
|
|
|
|
Sponsored by:<br /><a href="http://et.redhat.com/"><img src="et.png" alt="Project sponsored by Red Hat Emerging Technology" /></a></p>
|
2008-04-23 17:08:31 +00:00
|
|
|
</div>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
