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2008-04-23 17:08:31 +00:00
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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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<a title="Driver for the OpenVZ container technology" class="inactive" href="drvopenvz.html">OpenVZ</a>
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2008-11-21 12:54:51 +00:00
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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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2008-07-08 17:44:56 +00:00
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2008-04-25 16:23:51 +00:00
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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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2008-04-25 16:23:51 +00:00
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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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2008-07-08 17:44:56 +00:00
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2008-04-25 16:23:51 +00:00
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2008-04-25 16:23:51 +00:00
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2008-07-08 17:44:56 +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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2008-04-23 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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<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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<h2>Deployment pre-requisites</h2>
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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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</li><li>
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<strong>Xenner hypervisor</strong>: The driver will probe <code>/usr/bin</code>
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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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</li></ul>
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2009-01-27 14:49:09 +00:00
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<h2>Connections to QEMU driver</h2>
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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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</pre>
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<h2>
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<a name="xmlconfig" id="xmlconfig">Example domain XML config</a>
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</h2>
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<h3>QEMU emulated guest on x86_64</h3>
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<pre><domain type='qemu'>
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<name>QEmu-fedora-i686</name>
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<uuid>c7a5fdbd-cdaf-9455-926a-d65c16db1809</uuid>
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<memory>219200</memory>
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<currentMemory>219200</currentMemory>
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<vcpu>2</vcpu>
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<os>
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<type arch='i686' machine='pc'>hvm</type>
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<boot dev='cdrom'/>
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</os>
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<devices>
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<emulator>/usr/bin/qemu-system-x86_64</emulator>
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<disk type='file' device='cdrom'>
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<source file='/home/user/boot.iso'/>
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<target dev='hdc'/>
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<readonly/>
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</disk>
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<disk type='file' device='disk'>
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<source file='/home/user/fedora.img'/>
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<target dev='hda'/>
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</disk>
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<interface type='network'>
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<source network='default'/>
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</interface>
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<graphics type='vnc' port='-1'/>
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</devices>
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</domain></pre>
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<h3>KVM hardware accelerated guest on i686</h3>
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<pre><domain type='kvm'>
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<name>demo2</name>
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<uuid>4dea24b3-1d52-d8f3-2516-782e98a23fa0</uuid>
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<memory>131072</memory>
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<vcpu>1</vcpu>
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<os>
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<type arch="i686">hvm</type>
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</os>
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<clock sync="localtime"/>
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<devices>
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<emulator>/usr/bin/qemu-kvm</emulator>
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<disk type='file' device='disk'>
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<source file='/var/lib/libvirt/images/demo2.img'/>
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<target dev='hda'/>
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</disk>
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<interface type='network'>
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<source network='default'/>
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<mac address='24:42:53:21:52:45'/>
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</interface>
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<graphics type='vnc' port='-1' keymap='de'/>
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</devices>
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</domain></pre>
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<h3>Xen paravirtualized guests with hardware acceleration</h3>
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</div>
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</div>
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<div id="footer">
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2008-04-28 08:29:35 +00:00
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<p id="sponsor">
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Sponsored by:<br /><a href="http://et.redhat.com/"><img src="et.png" alt="Project sponsored by Red Hat Emerging Technology" /></a></p>
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2008-04-23 17:08:31 +00:00
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</div>
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