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20.16.7. Redirected Devices
USB device redirection through a character device is supported by configuring it with management tools that modify the following section of the domain xml:
...
<devices>
<redirdev bus='usb' type='tcp'>
<source mode='connect' host='localhost' service='4000'/>
<boot order='1'/>
</redirdev>
<redirfilter>
<usbdev class='0x08' vendor='0x1234' product='0xbeef' version='2.00' allow='yes'/>
<usbdev allow='no'/>
</redirfilter>
</devices>
...Figure 20.33. Devices - redirected devices
The components of this section of the domain XML are as follows:
| Parameter | Description |
|---|---|
redirdev | This is the main container for describing redirected devices. bus must be usb for a USB device. An additional attribute type is required, matching one of the supported serial device types, to describe the host physical machine side of the tunnel; type='tcp' or type='spicevmc' (which uses the usbredir channel of a SPICE graphics device) are typical. The redirdev element has an optional sub-element address which can tie the device to a particular controller. Further sub-elements, such as source, may be required according to the given type, although atarget sub-element is not required (since the consumer of the character device is the hypervisor itself, rather than a device visible in the guest virtual machine). |
boot | Specifies that the device is bootable. The order attribute determines the order in which devices will be tried during boot sequence. The per-device boot elements cannot be used together with general boot elements in BIOS boot loader section. |
redirfilter | This is used for creating the filter rule to filter out certain devices from redirection. It uses sub-element usbdev to define each filter rule. The class attribute is the USB Class code. |
