mirror of
https://gitlab.com/libvirt/libvirt.git
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1193d9737b
Commit 3bd4ed46 introduced this element as required which
breaks backcompat for test driver. Let's make the element optional.
Reviewed-by: Erik Skultety <eskultet@redhat.com>
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
418 lines
19 KiB
XML
418 lines
19 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<body>
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<h1>Node devices XML format</h1>
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<ul id="toc"></ul>
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<h2><a id="NodedevAttributes">Node Device XML</a></h2>
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<p>
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There are several libvirt functions, all with the
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prefix <code>virNodeDevice</code>, which deal with management of
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host devices that can be handed to guests via passthrough as
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<hostdev> elements
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in <a href="formatdomain.html#elementsHostDev">the domain XML</a>.
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These devices are represented as a hierarchy, where a device on
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a bus has a parent of the bus controller device; the root of the
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hierarchy is the node named "computer".
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</p>
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<p>
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When represented in XML, a node device uses the
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top-level <code>device</code> element, with the following
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elements present according to the type of device:
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</p>
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<dl>
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<dt><code>name</code></dt>
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<dd>The name for this device. The name will be alphanumeric,
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with words separated by underscore. For many devices, the
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name is just the bus type and address, as in
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"pci_0000_00_02_1" or "usb_1_5_3", but some devices are able
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to provide more specific names, such as
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"net_eth1_00_27_13_6a_fe_00".
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</dd>
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<dt><code>parent</code></dt>
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<dd>If this element is present, it names the parent device (that
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is, a controller to which this node belongs).
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</dd>
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<dt><code>devnode</code></dt>
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<dd>This node appears for each associated <code>/dev</code>
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special file. A mandatory attribute <code>type</code> specify
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the kind of file path, which may be either <code>dev</code> for
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the main name, or <code>link</code> for additional symlinks.
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</dd>
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<dt><code>capability</code></dt>
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<dd>This node appears for each capability that libvirt
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associates with a node. A mandatory
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attribute <code>type</code> lists which category the device
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belongs to, and controls which further subelements will be
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present to describe the node:
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<dl>
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<dt><code>system</code></dt>
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<dd>Describes the overall host. Sub-elements include:
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<dl>
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<dt><code>product</code></dt>
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<dd>If present, a simple text string giving the product
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name of the system.</dd>
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<dt><code>hardware</code></dt>
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<dd>Describes the hardware of the system, including
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sub-elements for <code>vendor</code>, <code>version</code>,
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<code>serial</code>, and <code>uuid</code>.</dd>
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<dt><code>firmware</code></dt>
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<dd>Describes the firmware of the system, including
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sub-elements for <code>vendor</code>, <code>version</code>,
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and <code>release_date</code>.</dd>
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</dl>
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</dd>
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<dt><code>pci</code></dt>
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<dd>Describes a device on the host's PCI bus. Sub-elements
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include:
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<dl>
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<dt><code>class</code></dt>
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<dd>Optional element for combined class, subclass and
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programming interface codes as 6-digit hexadecimal number.
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<span class="since">Since 5.2.0</span></dd>
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<dt><code>domain</code></dt>
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<dd>Which domain the device belongs to.</dd>
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<dt><code>bus</code></dt>
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<dd>Which bus within the domain.</dd>
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<dt><code>slot</code></dt>
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<dd>Which slot within the bus.</dd>
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<dt><code>function</code></dt>
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<dd>Which function within the slot.</dd>
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<dt><code>product</code></dt>
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<dd>Product details from the device ROM, including an
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attribute <code>id</code> with the hexadecimal product
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id, and an optional text description of that id.</dd>
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<dt><code>vendor</code></dt>
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<dd>Vendor details from the device ROM, including an
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attribute <code>id</code> with the hexadecimal vendor
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id, and an optional text name of that vendor.</dd>
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<dt><code>iommuGroup</code></dt>
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<dd>
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This optional element describes the "IOMMU group" this
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device belongs to. If the element exists, it has a
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mandatory <code>number</code> attribute which tells
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the group number used for management of the group (all
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devices in group "n" will be found in
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"/sys/kernel/iommu_groups/n"). It will also have a
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list of <code>address</code> subelements, each
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containing the PCI address of a device in the same
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group. The toplevel device will itself be included in
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this list.
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</dd>
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<dt><code>capability</code></dt>
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<dd>
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This optional element can occur multiple times. If it
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exists, it has a mandatory <code>type</code> attribute
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which will be set to:
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<dl>
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<dt><code>physical_function</code></dt>
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<dd>
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That means there will be a single <code>address</code>
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subelement which contains the PCI address of the SRIOV
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Physical Function (PF) that is the parent of this device
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(and this device is, by implication, an SRIOV Virtual
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Function (VF)).
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</dd>
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<dt><code>virtual_function</code></dt>
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<dd>
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In this case this device is an SRIOV PF, and the capability
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element will have a list of <code>address</code>
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subelements, one for each VF on this PF. If the host system
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supports reporting it (via the "sriov_maxvfs" file in the
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device's sysfs directory) the capability element will also
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have an attribute named <code>maxCount</code> which is the
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maximum number of SRIOV VFs supported by this device, which
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could be higher than the number of VFs that are curently
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active <span class="since">since 1.3.0</span>; in this case,
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even if there are currently no active VFs the
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virtual_functions capabililty will still be shown.
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</dd>
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<dt><code>pci-bridge</code> or <code>cardbus-bridge</code></dt>
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<dd>
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This shows merely that the lower 7 bits of PCI header type
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have either value of 1 or 2 respectively. Usually this
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means such device cannot be used for PCI passthrough.
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<span class="since">Since 1.3.3</span>
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</dd>
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</dl>
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</dd>
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<dt><code>numa</code></dt>
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<dd>
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This optional element contains information on the PCI device
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with respect to NUMA. For example, the optional
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<code>node</code> attribute tells which NUMA node is the PCI
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device associated with.
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</dd>
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<dt><code>pci-express</code></dt>
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<dd>
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This optional element contains information on PCI Express part of
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the device. For example, it can contain a child element
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<code>link</code> which addresses the PCI Express device's link.
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While a device has its own capabilities
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(<code>validity='cap'</code>), the actual run time capabilities
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are negotiated on the device initialization
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(<code>validity='sta'</code>). The <code>link</code> element then
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contains three attributes: <code>port</code> which says in which
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port is the device plugged in, <code>speed</code> (in
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GigaTransfers per second) and <code>width</code> for the number
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of lanes used. Since the port can't be negotiated, it's not
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exposed in <code>./pci-express/link/[@validity='sta']</code>.
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</dd>
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</dl>
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</dd>
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<dt><code>usb_device</code></dt>
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<dd>Describes a device on the host's USB bus, based on its
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location within the bus. Sub-elements include:
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<dl>
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<dt><code>bus</code></dt>
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<dd>Which bus the device belongs to.</dd>
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<dt><code>device</code></dt>
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<dd>Which device within the bus.</dd>
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<dt><code>product</code></dt>
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<dd>Product details from the device ROM, including an
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attribute <code>id</code> with the hexadecimal product
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id, and an optional text description of that id.</dd>
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<dt><code>vendor</code></dt>
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<dd>Vendor details from the device ROM, including an
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attribute <code>id</code> with the hexadecimal vendor
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id, and an optional text name of that vendor.</dd>
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</dl>
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</dd>
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<dt><code>usb</code></dt>
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<dd>Describes a USB device, based on its advertised driver
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interface. Sub-elements include:
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<dl>
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<dt><code>number</code></dt>
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<dd>The device number.</dd>
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<dt><code>class</code></dt>
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<dd>The device class.</dd>
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<dt><code>subclass</code></dt>
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<dd>The device subclass.</dd>
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<dt><code>protocol</code></dt>
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<dd>The device protocol.</dd>
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<dt><code>description</code></dt>
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<dd>If present, a description of the device.</dd>
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</dl>
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</dd>
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<dt><code>net</code></dt>
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<dd>Describes a device capable for use as a network
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interface. Sub-elements include:
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<dl>
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<dt><code>interface</code></dt>
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<dd>The interface name tied to this device.</dd>
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<dt><code>address</code></dt>
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<dd>If present, the MAC address of the device.</dd>
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<dt><code>link</code></dt>
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<dd>Optional to reflect the status of the link. It has
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two optional attributes: <code>speed</code> in Mbits per
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second and <code>state</code> to tell the state of the
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link. So far, the whole element is just for output,
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not setting.
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</dd>
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<dt><code>feature</code></dt>
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<dd>If present, the hw offloads supported by this network
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interface. Possible features are:
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<dl>
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<dt><code>rx</code></dt><dd>rx-checksumming</dd>
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<dt><code>tx</code></dt><dd>tx-checksumming</dd>
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<dt><code>sg</code></dt><dd>scatter-gather</dd>
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<dt><code>tso</code></dt><dd>tcp-segmentation-offload</dd>
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<dt><code>ufo</code></dt><dd>udp-fragmentation-offload</dd>
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<dt><code>gso</code></dt><dd>generic-segmentation-offload</dd>
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<dt><code>gro</code></dt><dd>generic-receive-offload</dd>
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<dt><code>lro</code></dt><dd>large-receive-offload</dd>
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<dt><code>rxvlan</code></dt><dd>rx-vlan-offload</dd>
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<dt><code>txvlan</code></dt><dd>tx-vlan-offload</dd>
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<dt><code>ntuple</code></dt><dd>ntuple-filters</dd>
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<dt><code>rxhash</code></dt><dd>receive-hashing</dd>
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<dt><code>rdma</code></dt><dd>remote-direct-memory-access</dd>
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<dt><code>txudptnl</code></dt><dd>tx-udp-tunnel-segmentation</dd>
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<dt><code>switchdev</code></dt><dd>kernel-forward-plane-offload</dd>
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</dl>
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</dd>
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<dt><code>capability</code></dt>
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<dd>A network protocol exposed by the device, where the
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attribute <code>type</code> can be "80203" for IEEE
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802.3, or "80211" for various flavors of IEEE 802.11.
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</dd>
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</dl>
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</dd>
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<dt><code>scsi_host</code></dt>
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<dd>Describes a SCSI host device. Sub-elements include:
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<dl>
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<dt><code>host</code></dt>
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<dd>The SCSI host number.</dd>
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<dt><code>unique_id</code></dt>
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<dd>On input, this optionally provides the value from the
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'unique_id' file found in the scsi_host's directory. To
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view the values of all 'unique_id' files, use <code>find -H
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/sys/class/scsi_host/host{0..9}/unique_id |
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xargs grep '[0-9]'</code>. On output, if the unique_id
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file exists, the value from the file will be displayed.
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This can be used in order to help uniquely identify the
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scsi_host adapter in a <a href="formatstorage.html">
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Storage Pool</a>. <span class="since">Since 1.2.7</span>
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</dd>
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<dt><code>capability</code></dt>
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<dd>Current capabilities include "vports_ops" (indicates
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vport operations are supported) and "fc_host". "vport_ops"
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could contain two optional sub-elements: <code>vports</code>,
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and <code>max_vports</code>. <code>vports</code> shows the
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number of vport in use. <code>max_vports</code> shows the
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maximum vports the HBA supports. "fc_host" implies following
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sub-elements: <code>wwnn</code>, <code>wwpn</code>, and
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optionally <code>fabric_wwn</code>.
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</dd>
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</dl>
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</dd>
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<dt><code>scsi</code></dt>
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<dd>Describes a SCSI device. Sub-elements include:
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<dl>
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<dt><code>host</code></dt>
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<dd>The SCSI host containing the device.</dd>
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<dt><code>bus</code></dt>
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<dd>The bus within the host.</dd>
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<dt><code>target</code></dt>
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<dd>The target within the bus.</dd>
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<dt><code>lun</code></dt>
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<dd>The lun within the target.</dd>
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<dt><code>type</code></dt>
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<dd>The type of SCSI device.</dd>
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</dl>
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</dd>
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<dt><code>storage</code></dt>
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<dd>Describes a device usable for storage. Sub-elements
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include:
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<dl>
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<dt><code>block</code></dt>
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<dd>A block device file name that accesses the storage
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present on the device.</dd>
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<dt><code>bus</code></dt>
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<dd>If present, the name of the bus the device is found
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on.</dd>
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<dt><code>drive_type</code></dt>
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<dd>The type of the drive, such as "disk" or
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"cdrom".</dd>
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<dt><code>model</code></dt>
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<dd>Any model information available from the
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device.</dd>
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<dt><code>vendor</code></dt>
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<dd>Any vendor information available from the
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device.</dd>
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<dt><code>serial</code></dt>
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<dd>Any serial number information available from the
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device.</dd>
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<dt><code>size</code></dt>
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<dd>For fixed-size storage, the amount of storage
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available.</dd>
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<dt><code>capability</code></dt>
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<dd>If present, an additional capability is listed via
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the attribute <code>type</code>. Current capabilities
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include "hotpluggable" and "removable", with the
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latter implying the following
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sub-elements: <code>media_available</code> (0 or
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1), <code>media_size</code>,
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and <code>media_label</code>.</dd>
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</dl>
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</dd>
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<dt><code>drm</code></dt>
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<dd>Describes a Direct Rendering Manager (DRM) device.
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Sub-elements include:
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<dl>
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<dt><code>type</code></dt>
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<dd>The type of DRM device. Could be
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<code>primary</code>, <code>control</code> or
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<code>render</code>.</dd>
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</dl>
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</dd>
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<dt><code>ccw</code></dt>
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<dd>Describes a Command Channel Word (CCW) device commonly found on
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the S390 architecture. Sub-elements include:
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<dl>
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<dt><code>cssid</code></dt>
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<dd>The channel subsystem identifier.</dd>
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<dt><code>ssid</code></dt>
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<dd>The subchannel-set identifier.</dd>
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<dt><code>devno</code></dt>
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<dd>The device number.</dd>
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</dl>
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</dd>
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</dl>
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</dd>
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</dl>
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<h2><a id="nodeExample">Examples</a></h2>
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<p>The following are some example node device XML outputs:</p>
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<pre>
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<device>
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<name>computer</name>
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<capability type='system'>
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<product>2241B36</product>
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<hardware>
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<vendor>LENOVO</vendor>
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<version>ThinkPad T500</version>
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<serial>R89055N</serial>
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<uuid>c9488981-5049-11cb-9c1c-993d0230b4cd</uuid>
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</hardware>
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<firmware>
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<vendor>LENOVO</vendor>
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<version>6FET82WW (3.12 )</version>
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<release_date>11/26/2009</release_date>
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</firmware>
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</capability>
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</device>
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<device>
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<name>net_eth1_00_27_13_6a_fe_00</name>
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<parent>pci_0000_00_19_0</parent>
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<capability type='net'>
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<interface>eth1</interface>
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<address>00:27:13:6a:fe:00</address>
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<capability type='80203'/>
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</capability>
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</device>
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<device>
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<name>pci_0000_02_00_0</name>
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<path>/sys/devices/pci0000:00/0000:00:04.0/0000:02:00.0</path>
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<parent>pci_0000_00_04_0</parent>
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<driver>
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<name>igb</name>
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</driver>
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<capability type='pci'>
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<class>0x020000</class>
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<domain>0</domain>
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<bus>2</bus>
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<slot>0</slot>
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<function>0</function>
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<product id='0x10c9'>82576 Gigabit Network Connection</product>
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<vendor id='0x8086'>Intel Corporation</vendor>
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<capability type='virt_functions'>
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<address domain='0x0000' bus='0x02' slot='0x10' function='0x0'/>
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<address domain='0x0000' bus='0x02' slot='0x10' function='0x2'/>
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<address domain='0x0000' bus='0x02' slot='0x10' function='0x4'/>
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<address domain='0x0000' bus='0x02' slot='0x10' function='0x6'/>
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<address domain='0x0000' bus='0x02' slot='0x11' function='0x0'/>
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<address domain='0x0000' bus='0x02' slot='0x11' function='0x2'/>
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<address domain='0x0000' bus='0x02' slot='0x11' function='0x4'/>
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</capability>
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<iommuGroup number='12'>
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<address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
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<address domain='0x0000' bus='0x02' slot='0x00' function='0x1'/>
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</iommuGroup>
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<pci-express>
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<link validity='cap' port='1' speed='2.5' width='1'/>
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<link validity='sta' speed='2.5' width='1'/>
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</pci-express>
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</capability>
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</device>
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</pre>
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</body>
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</html>
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