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doc: update usb redirection filter infomation on formatdomain.html
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@ -2136,6 +2136,10 @@
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<redirdev bus='usb' type='tcp'>
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<source mode='connect' host='localhost' service='4000'/>
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</redirdev>
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<redirfilter>
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<usbdev class='0x08' vendor='0x1234' product='0xbeef' version='2.00' allow='yes'/>
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<usbdev allow='no'/>
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</redirfilter>
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</devices>
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...</pre>
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@ -2152,21 +2156,27 @@
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tunnel; <code>type='tcp'</code>
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or <code>type='spicevmc'</code> (which uses the usbredir
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channel of a <a href="#elementsGraphics">SPICE graphics
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device</a>) are typical.</dd>
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device</a>) are typical.The redirdev element has an optional
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sub-element<code><address></code> which can tie the
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device to a particular controller. Further sub-elements,
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such as <code><source></code>, may be required according
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to the given type, although a <code><target></code> sub-element
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is not required (since the consumer of the character device is
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the hypervisor itself,rather than a device visible in the guest).
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</dd>
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<dt><code>redirfilter</code></dt>
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<dd>The<code> redirfilter </code>element is used for creating the
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filter rule to filter out certain devices from redirection.
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It uses sub-element <code><usbdev></code>to define each filter rule.
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<code>class</code>attribute is the USB Class code, for example,
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0x08 represents mass storage devices. The USB device can be addressed by
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vendor / product id using the<code>vendor</code> and <code>product</code> attributes.
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<code>version</code> is the bcdDevice value of USB device, such as 1.00, 1.10 and 2.00.
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These four attributes are optional and <code>-1</code> can be used to allow
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any value for them. <code>allow</code>attribute is mandatory,
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'yes' means allow, 'no' for deny.
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</dd>
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</dl>
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<p>
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The redirdev element has an optional sub-element
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<code><address></code> which can tie the device to a
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particular controller.
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</p>
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<p>
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Further sub-elements, such as <code><source></code>, may
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be required according to the given type, although
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a <code><target></code> sub-element is not required (since
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the consumer of the character device is the hypervisor itself,
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rather than a device visible in the guest).
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</p>
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<h4><a name="elementsSmartcard">Smartcard devices</a></h4>
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