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By specifying <vendor> element in CPU requirements a guest can be restricted to run only on CPUs by a given vendor. Host CPU vendor is also specified in capabilities XML. The vendor is checked when migrating a guest but it's not forced, i.e., guests configured without <vendor> element can be freely migrated.
79 lines
3.3 KiB
HTML
79 lines
3.3 KiB
HTML
<html>
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<body>
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<h1>Driver capabilities XML format</h1>
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<p>As new virtualization engine support gets added to libvirt, and to handle
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cases like QEmu supporting a variety of emulations, a query interface has
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been added in 0.2.1 allowing to list the set of supported virtualization
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capabilities on the host:</p>
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<pre> char * virConnectGetCapabilities (virConnectPtr conn);</pre>
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<p>The value returned is an XML document listing the virtualization
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capabilities of the host and virtualization engine to which
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<code>@conn</code> is connected. One can test it using <code>virsh</code>
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command line tool command '<code>capabilities</code>', it dumps the XML
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associated to the current connection. For example in the case of a 64 bits
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machine with hardware virtualization capabilities enabled in the chip and
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BIOS you will see</p>
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<pre><capabilities>
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<span style="color: #E50000"><host>
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<cpu>
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<arch>x86_64</arch>
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<features>
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<vmx/>
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</features>
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<model>core2duo</model>
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<vendor>Intel</vendor>
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<topology sockets="1" cores="2" threads="1"/>
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<feature name="lahf_lm"/>
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<feature name='xtpr'/>
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...
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</cpu>
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</host></span>
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<!-- xen-3.0-x86_64 -->
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<span style="color: #0000E5"><guest>
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<os_type>xen</os_type>
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<arch name="x86_64">
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<wordsize>64</wordsize>
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<domain type="xen"></domain>
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<emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
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</arch>
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<features>
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</features>
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</guest></span>
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<!-- hvm-3.0-x86_32 -->
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<span style="color: #00B200"><guest>
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<os_type>hvm</os_type>
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<arch name="i686">
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<wordsize>32</wordsize>
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<domain type="xen"></domain>
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<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
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<machine>pc</machine>
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<machine>isapc</machine>
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<loader>/usr/lib/xen/boot/hvmloader</loader>
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</arch>
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<features>
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<cpuselection/>
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</features>
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</guest></span>
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...
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</capabilities></pre>
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<p>The first block (in red) indicates the host hardware capabilities, currently
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it is limited to the CPU properties but other information may be available,
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it shows the CPU architecture, topology, model name, and additional features
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which are not included in the model but the CPU provides them. Features of the
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chip are shown within the feature block (the block is similar to what you will
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find in a Xen fully virtualized domain description).</p>
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<p>The second block (in blue) indicates the paravirtualization support of the
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Xen support, you will see the os_type of xen to indicate a paravirtual
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kernel, then architecture information and potential features.</p>
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<p>The third block (in green) gives similar information but when running a
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32 bit OS fully virtualized with Xen using the hvm support.</p>
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<p>This section is likely to be updated and augmented in the future, see <a href="https://www.redhat.com/archives/libvir-list/2007-March/msg00215.html">the
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discussion</a> which led to the capabilities format in the mailing-list
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archives.</p>
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</body>
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</html>
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