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<h1>Node devices XML format</h1>
<ul id="toc"></ul>
<h2><a name="NodedevAttributes">Node Device XML</a></h2>
<p>
There are several libvirt functions, all with the
prefix <code>virNodeDevice</code>, which deal with management of
host devices that can be handed to guests via passthrough as
<hostdev> elements
in <a href="formatdomain.html#elementsUSB">the domain XML</a>.
These devices are represented as a hierarchy, where a device on
a bus has a parent of the bus controller device; the root of the
hierarchy is the node named "computer".
</p>
<p>
When represented in XML, a node device uses the
top-level <code>device</code> element, with the following
elements present according to the type of device:
</p>
<dl>
<dt><code>name</code></dt>
<dd>The name for this device. The name will be alphanumeric,
with words separated by underscore. For many devices, the
name is just the bus type and address, as in
"pci_0000_00_02_1" or "usb_1_5_3", but some devices are able
to provide more specific names, such as
"net_eth1_00_27_13_6a_fe_00".
</dd>
<dt><code>parent</code></dt>
<dd>If this element is present, it names the parent device (that
is, a controller to which this node belongs).
</dd>
<dt><code>capability</code></dt>
<dd>This node appears for each capability that libvirt
associates with a node. A mandatory
attribute <code>type</code> lists which category the device
belongs to, and controls which further subelements will be
present to describe the node:
<dl>
<dt><code>system</code></dt>
<dd>Describes the overall host. Sub-elements include:
<dl>
<dt><code>product</code></dt>
<dd>If present, a simple text string giving the product
name of the system.</dd>
<dt><code>hardware</code></dt>
<dd>Describes the hardware of the system, including
sub-elements for <code>vendor</code>, <code>version</code>,
<code>serial</code>, and <code>uuid</code>.</dd>
<dt><code>firmware</code></dt>
<dd>Describes the firmware of the system, including
sub-elements for <code>vendor</code>, <code>version</code>,
and <code>release_date</code>.</dd>
</dl>
</dd>
<dt><code>pci</code></dt>
<dd>Describes a device on the host's PCI bus. Sub-elements
include:
<dl>
<dt><code>domain</code></dt>
<dd>Which domain the device belongs to.</dd>
<dt><code>bus</code></dt>
<dd>Which bus within the domain.</dd>
<dt><code>slot</code></dt>
<dd>Which slot within the bus.</dd>
<dt><code>function</code></dt>
<dd>Which function within the slot.</dd>
<dt><code>product</code></dt>
<dd>Product details from the device ROM, including an
attribute <code>id</code> with the hexadecimal product
id, and an optional text description of that id.</dd>
<dt><code>vendor</code></dt>
<dd>Vendor details from the device ROM, including an
attribute <code>id</code> with the hexadecimal vendor
id, and an optional text name of that vendor.</dd>
</dl>
</dd>
<dt><code>usb_device</code></dt>
<dd>Describes a device on the host's USB bus, based on its
location within the bus. Sub-elements include:
<dl>
<dt><code>bus</code></dt>
<dd>Which bus the device belongs to.</dd>
<dt><code>device</code></dt>
<dd>Which device within the bus.</dd>
<dt><code>product</code></dt>
<dd>Product details from the device ROM, including an
attribute <code>id</code> with the hexadecimal product
id, and an optional text description of that id.</dd>
<dt><code>vendor</code></dt>
<dd>Vendor details from the device ROM, including an
attribute <code>id</code> with the hexadecimal vendor
id, and an optional text name of that vendor.</dd>
</dl>
</dd>
<dt><code>usb</code></dt>
<dd>Describes a USB device, based on its advertised driver
interface. Sub-elements include:
<dl>
<dt><code>number</code></dt>
<dd>The device number.</dd>
<dt><code>number</code></dt>
<dd>The device class.</dd>
<dt><code>number</code></dt>
<dd>The device subclass.</dd>
<dt><code>number</code></dt>
<dd>The device protocol.</dd>
<dt><code>description</code></dt>
<dd>If present, a description of the device.</dd>
</dl>
</dd>
<dt><code>net</code></dt>
<dd>Describes a device capable for use as a network
interface. Sub-elements include:
<dl>
<dt><code>interface</code></dt>
<dd>The interface name tied to this device.</dd>
<dt><code>address</code></dt>
<dd>If present, the MAC address of the device.</dd>
<dt><code>capability</code></dt>
<dd>A network protocol exposed by the device, where the
attribute <code>type</code> can be "80203" for IEEE
802.3, or "80211" for various flavors of IEEE 802.11.
</dd>
</dl>
</dd>
<dt><code>scsi_host</code></dt>
<dd>Describes a SCSI host device. Sub-elements include:
<dl>
<dt><code>host</code></dt>
<dd>The SCSI host number.</dd>
<dt><code>capability</code></dt>
<dd>Current capabilities include "vports_ops" (indicates
vport operations are supported) and "fc_host", the later
implies following sub-elements: <code>wwnn</code>,
<code>wwpn</code>, <code>fabric_wwn</code>.
</dd>
</dl>
</dd>
<dt><code>scsi</code></dt>
<dd>Desribes a SCSI device. Sub-elements include:
<dl>
<dt><code>host</code></dt>
<dd>The SCSI host containing the device.</dd>
<dt><code>bus</code></dt>
<dd>The bus within the host.</dd>
<dt><code>target</code></dt>
<dd>The target within the bus.</dd>
<dt><code>lun</code></dt>
<dd>The lun within the target.</dd>
<dt><code>type</code></dt>
<dd>The type of SCSI device.</dd>
</dl>
</dd>
<dt><code>storage</code></dt>
<dd>Describes a device usable for storage. Sub-elements
include:
<dl>
<dt><code>block</code></dt>
<dd>A block device file name that accesses the storage
present on the device.</dd>
<dt><code>bus</code></dt>
<dd>If present, the name of the bus the device is found
on.</dd>
<dt><code>drive_type</code></dt>
<dd>The type of the drive, such as "disk" or
"cdrom".</dd>
<dt><code>model</code></dt>
<dd>Any model information available from the
device.</dd>
<dt><code>vendor</code></dt>
<dd>Any vendor information available from the
device.</dd>
<dt><code>serial</code></dt>
<dd>Any serial number information available from the
device.</dd>
<dt><code>size</code></dt>
<dd>For fixed-size storage, the amount of storage
available.</dd>
<dt><code>capability</code></dt>
<dd>If present, an additional capability is listed via
the attribute <code>type</code>. Current capabilites
include "hotpluggable" and "removable", with the
latter implying the following
sub-elements: <code>media_available</code> (0 or
1), <code>media_size</code>,
and <code>media_label</code>.</dd>
</dl>
</dd>
</dl>
</dd>
</dl>
<h2><a name="nodeExample">Examples</a></h2>
<p>The following are some example node device XML outputs:</p>
<pre>
<device>
<name>computer</name>
<capability type='system'>
<product>2241B36</product>
<hardware>
<vendor>LENOVO</vendor>
<version>ThinkPad T500</version>
<serial>R89055N</serial>
<uuid>c9488981-5049-11cb-9c1c-993d0230b4cd</uuid>
</hardware>
<firmware>
<vendor>LENOVO</vendor>
<version>6FET82WW (3.12 )</version>
<release_date>11/26/2009</release_date>
</firmware>
</capability>
</device>
<device>
<name>net_eth1_00_27_13_6a_fe_00</name>
<parent>pci_0000_00_19_0</parent>
<capability type='net'>
<interface>eth1</interface>
<address>00:27:13:6a:fe:00</address>
<capability type='80203'/>
</capability>
</device></pre>
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