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docs: document <driver name='vhost'/> for interfaces
* docs/formatdomain.html.in: Document virtio backend selection.
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@ -1388,7 +1388,7 @@ qemu-kvm -net nic,model=? /dev/null
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<source network='default'/>
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<target dev='vnet1'/>
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<model type='virtio'/>
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<b><driver txmode='iothread'/></b>
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<b><driver name='vhost' txmode='iothread'/></b>
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</interface>
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</devices>
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...</pre>
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@ -1401,6 +1401,18 @@ qemu-kvm -net nic,model=? /dev/null
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</p>
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<dl>
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<dt><code>name</code></dt>
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<dd>
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The optional <code>name</code> attribute forces which type of
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backend driver to use. The value can be either 'qemu' (a
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user-space backend) or 'vhost' (a kernel backend, which
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requires the vhost module to be provided by the kernel); an
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attempt to require the vhost driver without kernel support
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will be rejected. If this attribute is not present, then the
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domain defaults to 'vhost' if present, but silently falls back
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to 'qemu' without error.
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<span class="since">Since 0.8.8 (QEMU and KVM only)</span>
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</dd>
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<dt><code>txmode</code></dt>
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<dd>
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The <code>txmode</code> attribute specifies how to handle
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