mirror of https://gitee.com/openkylin/libvirt.git
557 lines
19 KiB
ReStructuredText
557 lines
19 KiB
ReStructuredText
.. role:: since
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=======================
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Node devices XML format
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=======================
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.. contents::
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Node Device XML
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---------------
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There are several libvirt functions, all with the prefix ``virNodeDevice``,
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which deal with management of host devices that can be handed to guests via
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passthrough as <hostdev> elements in `the domain
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XML <formatdomain.html#elementsHostDev>`__. These devices are represented as a
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hierarchy, where a device on a bus has a parent of the bus controller device;
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the root of the hierarchy is the node named "computer".
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When represented in XML, a node device uses the top-level ``device`` element,
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with the following elements present according to the type of device:
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``name``
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The name for this device. The name will be alphanumeric, with words separated
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by underscore. For many devices, the name is just the bus type and address,
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as in "pci_0000_00_02_1" or "usb_1_5_3", but some devices are able to provide
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more specific names, such as "net_eth1_00_27_13_6a_fe_00". This is a
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read-only field that is reported by the device driver. If this element is set
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when defining a new device, it will be ignored.
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``path``
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Fully qualified sysfs path to the device. This is a read-only field that is
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reported by the device driver. If this element is set when defining a new
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device, it will be ignored.
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``parent``
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This element identifies the parent node in the device hierarchy. The value of
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the element will correspond with the device parent's ``name`` element or
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``computer`` if the device does not have any parent.
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``driver``
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This elements reports the driver in use for this device. The presence of this
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element in the output XML depends on whether the underlying device manager
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(most likely udev) exposes information about the driver.
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``devnode``
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This node appears for each associated ``/dev`` special file. A mandatory
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attribute ``type`` specify the kind of file path, which may be either ``dev``
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for the main name, or ``link`` for additional symlinks.
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``capability``
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This node appears for each capability that libvirt associates with a node. A
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mandatory attribute ``type`` lists which category the device belongs to.
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The `capability types`_ section below describes them further.
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``capability`` types
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~~~~~~~~~~~~~~~~~~~~
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Based on the capbility type there are further more specific attributes to a
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device described below.
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``system``
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^^^^^^^^^^
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Describes the overall host. Sub-elements include:
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``product``
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If present, a simple text string giving the product name of the system.
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``hardware``
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Describes the hardware of the system, including sub-elements for
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``vendor``, ``version``, ``serial``, and ``uuid``.
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``firmware``
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Describes the firmware of the system, including sub-elements for
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``vendor``, ``version``, and ``release_date``.
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``pci``
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^^^^^^^
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Describes a device on the host's PCI bus. Sub-elements include:
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``class``
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Optional element for combined class, subclass and programming interface
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codes as 6-digit hexadecimal number. :since:`Since 5.2.0`
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``domain``
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Which domain the device belongs to.
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``bus``
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Which bus within the domain.
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``slot``
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Which slot within the bus.
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``function``
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Which function within the slot.
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``product``
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Product details from the device ROM, including an attribute ``id`` with
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the hexadecimal product id, and an optional text description of that
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id.
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``vendor``
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Vendor details from the device ROM, including an attribute ``id`` with
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the hexadecimal vendor id, and an optional text name of that vendor.
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``iommuGroup``
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This optional element describes the "IOMMU group" this device belongs
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to. If the element exists, it has a mandatory ``number`` attribute
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which tells the group number used for management of the group (all
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devices in group "n" will be found in "/sys/kernel/iommu_groups/n"). It
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will also have a list of ``address`` subelements, each containing the
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PCI address of a device in the same group. The toplevel device will
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itself be included in this list.
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``capability``
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This optional element can occur multiple times. If it exists, it has a
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mandatory ``type`` attribute which will be set to:
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``phys_function``
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That means there will be a single ``address`` subelement which
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contains the PCI address of the SRIOV Physical Function (PF) that is
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the parent of this device (and this device is, by implication, an
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SRIOV Virtual Function (VF)).
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``virt_functions``
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In this case this device is an SRIOV PF, and the capability element
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will have a list of ``address`` subelements, one for each VF on this
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PF. If the host system supports reporting it (via the
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"sriov_totalvfs" file in the device's sysfs directory) the
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capability element will also have an attribute named ``maxCount``
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which is the maximum number of SRIOV VFs supported by this device,
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which could be higher than the number of VFs that are currently
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active :since:`since 1.3.0` ; in this case, even if there are
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currently no active VFs the virtual_functions capabililty will still
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be shown.
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``pci-bridge`` or ``cardbus-bridge``
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This shows merely that the lower 7 bits of PCI header type have
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either value of 1 or 2 respectively. Usually this means such device
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cannot be used for PCI passthrough. :since:`Since 1.3.3`
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``mdev_types``
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This device is capable of creating mediated devices. The
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sub-elements are summarized in `mdev_types capability`_.
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``vpd``
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This device exposes a VPD PCI/PCIe capability. The sub-elements are
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summarized in `vpd capability`_.
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``numa``
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This optional element contains information on the PCI device with
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respect to NUMA. For example, the optional ``node`` attribute tells
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which NUMA node is the PCI device associated with.
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``pci-express``
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This optional element contains information on PCI Express part of the
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device. For example, it can contain a child element ``link`` which
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addresses the PCI Express device's link. While a device has its own
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capabilities (``validity='cap'``), the actual run time capabilities are
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negotiated on the device initialization (``validity='sta'``). The
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``link`` element then contains three attributes: ``port`` which says in
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which port is the device plugged in, ``speed`` (in GigaTransfers per
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second) and ``width`` for the number of lanes used. Since the port
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can't be negotiated, it's not exposed in
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``./pci-express/link/[`validity='sta']``.
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``usb_device``
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^^^^^^^^^^^^^^
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Describes a device on the host's USB bus, based on its location within the bus.
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Sub-elements include:
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``bus``
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Which bus the device belongs to.
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``device``
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Which device within the bus.
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``product``
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Product details from the device ROM, including an attribute ``id`` with
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the hexadecimal product id, and an optional text description of that
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id.
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``vendor``
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Vendor details from the device ROM, including an attribute ``id`` with
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the hexadecimal vendor id, and an optional text name of that vendor.
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``usb``
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^^^^^^^
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Describes a USB device, based on its advertised driver interface. Sub-elements
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include:
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``number``
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The device number.
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``class``
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The device class.
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``subclass``
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The device subclass.
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``protocol``
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The device protocol.
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``description``
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If present, a description of the device.
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``net``
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^^^^^^^
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Describes a device capable for use as a network interface. Sub-elements
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include:
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``interface``
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The interface name tied to this device.
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``address``
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If present, the MAC address of the device.
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``link``
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Optional to reflect the status of the link. It has two optional
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attributes: ``speed`` in Mbits per second and ``state`` to tell the
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state of the link. So far, the whole element is just for output, not
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setting.
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``feature``
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If present, the hw offloads supported by this network interface.
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Possible features are:
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``rx``
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rx-checksumming
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``tx``
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tx-checksumming
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``sg``
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scatter-gather
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``tso``
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tcp-segmentation-offload
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``ufo``
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udp-fragmentation-offload
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``gso``
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generic-segmentation-offload
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``gro``
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generic-receive-offload
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``lro``
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large-receive-offload
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``rxvlan``
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rx-vlan-offload
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``txvlan``
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tx-vlan-offload
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``ntuple``
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ntuple-filters
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``rxhash``
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receive-hashing
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``rdma``
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remote-direct-memory-access
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``txudptnl``
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tx-udp-tunnel-segmentation
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``switchdev``
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kernel-forward-plane-offload
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``capability``
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A network protocol exposed by the device, where the attribute ``type``
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can be "80203" for IEEE 802.3, or "80211" for various flavors of IEEE
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802.11.
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``scsi_host``
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^^^^^^^^^^^^^
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Describes a SCSI host device. Sub-elements include:
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``host``
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The SCSI host number.
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``unique_id``
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On input, this optionally provides the value from the 'unique_id' file
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found in the scsi_host's directory. To view the values of all
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'unique_id' files, use
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``find -H /sys/class/scsi_host/host{0..9}/unique_id | xargs grep '[0-9]'``.
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On output, if the unique_id file exists, the value from the file will
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be displayed. This can be used in order to help uniquely identify the
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scsi_host adapter in a `Storage Pool <formatstorage.html>`__.
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:since:`Since 1.2.7`
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``capability``
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Current capabilities include "vports_ops" (indicates vport operations
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are supported) and "fc_host". "vport_ops" could contain two optional
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sub-elements: ``vports``, and ``max_vports``. ``vports`` shows the
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number of vport in use. ``max_vports`` shows the maximum vports the HBA
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supports. "fc_host" implies following sub-elements: ``wwnn``, ``wwpn``,
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and optionally ``fabric_wwn``.
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``scsi``
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^^^^^^^^
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Describes a SCSI device. Sub-elements include:
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``host``
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The SCSI host containing the device.
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``bus``
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The bus within the host.
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``target``
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The target within the bus.
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``lun``
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The lun within the target.
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``type``
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The type of SCSI device.
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``storage``
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^^^^^^^^^^^
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Describes a device usable for storage. Sub-elements include:
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``block``
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A block device file name that accesses the storage present on the
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device.
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``bus``
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If present, the name of the bus the device is found on.
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``drive_type``
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The type of the drive, such as "disk" or "cdrom".
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``model``
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Any model information available from the device.
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``vendor``
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Any vendor information available from the device.
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``serial``
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Any serial number information available from the device.
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``size``
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For fixed-size storage, the amount of storage available.
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``capability``
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If present, an additional capability is listed via the attribute
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``type``. Current capabilities include "hotpluggable" and "removable",
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with the latter implying the following sub-elements:
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``media_available`` (0 or 1), ``media_size``, and ``media_label``.
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``drm``
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^^^^^^^
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Describes a Direct Rendering Manager (DRM) device. Sub-elements include:
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``type``
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The type of DRM device. Could be ``primary``, ``control`` or ``render``.
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``mdev``
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^^^^^^^^
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Describes a mediated device. :since:`Since 3.4.0` Sub-elements include:
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``type``
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Describes a mediated device type which acts as an abstract template
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defining a resource allocation for instances of this device type. The
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element has one attribute ``id`` which holds an official
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vendor-supplied identifier for the type.
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``iommuGroup``
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This element supports a single attribute ``number`` which holds the
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IOMMU group number to which the mediated device belongs. This is a
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read-only field that is reported by the device driver.
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``attr``
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This optional element can occur multiple times. It represents a
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vendor-specific attribute that is used to configure this mediated
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device. It has two required attributes: ``name`` and ``value``. Note
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that the order in which attributes are set may be important for some
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devices. The order that they appear in the xml definition determines
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the order that they will be written to the device.
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``uuid``
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This element represents the UUID of the mediated device.
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``ccw``
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^^^^^^^
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Describes a Command Channel Word (CCW) device commonly found on the S390
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architecture. Sub-elements include:
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``cssid``
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The channel subsystem identifier.
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``ssid``
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The subchannel-set identifier.
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``devno``
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The device number.
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``css``
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^^^^^^^
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Describes a subchannel in the Channel SubSystem (CSS) commonly found on the
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S390 architecture. Sub-elements include:
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``cssid``
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The channel subsystem identifier.
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``ssid``
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The subchannel-set identifier.
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``devno``
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The subchannel number.
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``capability``
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This optional element can occur multiple times. If it exists, it has a
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mandatory ``type`` attribute which will be set to:
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``mdev_types``
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:since:`Since 6.10.0` This device is capable of creating mediated
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devices. The sub-elements are summarized in `mdev_types capability`_.
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``vdpa``
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^^^^^^^^
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Describes a virtual datapath acceleration (vDPA) network device. :since:`Since
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6.9.0` . Sub-elements include:
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``chardev``
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The path to the character device that is used to access the device.
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``ap_card``
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^^^^^^^^^^^
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Describes the Adjunct Processor (AP) Card device on a S390 host. Sub-elements
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include:
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``ap-adapter``
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AP Card identifier.
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``ap_queue``
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^^^^^^^^^^^^
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Describes the AP queue on a s390 host. An AP queue is an AP domain on an AP
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adapter which is specified by an adapter identifier and a domain identifier.
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Sub-elements include:
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``ap-adapter``
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The ap-adapter of an AP queue identifies the AP card to which this AP
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queue belongs.
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``ap-domain``
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The ap-domain of an AP queue identifies the AP domain to which this AP
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queue belongs.
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AP Queue identifier.
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``ap_matrix``
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^^^^^^^^^^^^^
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Describes an AP Matrix device on a S390 architecture providing cryptographic
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host resources usable for virtualization. Sub-elements include:
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``capability``
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This optional element can occur multiple times. If it exists, it has a
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mandatory ``type`` attribute which will be set to:
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``mdev_types``
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:since:`Since 6.10.0` This device is capable of creating mediated
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devices. The sub-elements are summarized in `mdev_types capability`_
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``mdev_types`` capability
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~~~~~~~~~~~~~~~~~~~~~~~~~
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`pci`_, `css`_ and `ap_matrix`_ devices can be capable of creating mediated
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devices. If they indeed are capable, then the parent ``capability`` element for
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``mdev_types`` type will contain a list of ``type`` elements, which list all
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mdev types supported on the physical device. :since:`Since 3.4.0` Each ``type``
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element has a single ``id`` attribute that holds an official vendor-supplied
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identifier for the type. It supports the following sub-elements:
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``name``
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The ``name`` element holds a vendor-supplied code name for the given mediated
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device type. This is an optional element.
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``deviceAPI``
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The value of this element describes how an instance of the given type will be
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presented to the guest by the VFIO framework.
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``availableInstances``
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This element reports the current state of resource allocation. In other
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words, how many instances of the given type can still be successfully created
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on the physical device.
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``vpd`` capability
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~~~~~~~~~~~~~~~~~~
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`pci`_ devices can expose a VPD capability which is optional per
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PCI Local Bus 2.2+ and PCIe 4.0+ specifications. If the VPD capability is
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present, then the parent ``capability`` element with the ``vpd`` type will
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contain a ``name`` element (containing a manufacturer-provided device name) and
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optionally one or two ``fields`` elements with an ``access`` attribute set to
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``readonly`` or ``readwrite``.
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The read-only ``fields`` element may contain the following elements:
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``change_level``
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An engineering change level for this add-in card.
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``manufacture_id``
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An extension to the Vendor ID (or Subsystem Vendor ID) in the Configuration
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Space header which allows vendors the flexibility to identify an additional
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level of detail pertaining to the sourcing of a PCI device.
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``part_number``
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An extension to the Device ID (or Subsystem ID) in the Configuration Space
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header specifying a part number of an add-in card.
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``serial_number``
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A unique add-in card Serial Number.
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``vendor_field``
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Zero or many of those elements with an ``index`` attribute (since-character
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upper-case ASCII alphanumeric indexes). Contents will vary depending on a
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vendor.
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All fields are optional and are not guaranteed to be present for a generic PCI
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device.
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The read-write ``fields`` element may contain the following elements:
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``asset_tag``
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A system asset identifier provided by the system owner.
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``vendor_field``
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Zero or many of those elements with an ``index`` attribute (since-character
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upper-case ASCII alphanumeric indexes). Contents will vary depending on a
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vendor.
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``system_field``
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Zero or many of those elements with an ``index`` attribute (since-character
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upper-case ASCII alphanumeric indexes, except for letter 'A'). May store
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system-specific data related to a PCI device.
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All fields are optional and are not guaranteed to be present for a generic PCI
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device. Read-write fields are not possible to alter via Libvirt at the time of
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writing but their content is refreshed on each invocation in case this is done
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by means external to Libvirt.
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The device name and all fields may contain only the following characters:
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``[0-9a-zA-F -_,.:;=]``. The device name may be as large as 65535 bytes while
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fields are limited with 255 bytes.
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Examples
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--------
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The following are some example node device XML outputs:
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::
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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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|
|
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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'>
|
|
<address domain='0x0000' bus='0x02' slot='0x10' function='0x0'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x10' function='0x2'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x10' function='0x4'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x10' function='0x6'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x11' function='0x0'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x11' function='0x2'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x11' function='0x4'/>
|
|
</capability>
|
|
<iommuGroup number='12'>
|
|
<address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
|
|
<address domain='0x0000' bus='0x02' slot='0x00' function='0x1'/>
|
|
</iommuGroup>
|
|
<pci-express>
|
|
<link validity='cap' port='1' speed='2.5' width='1'/>
|
|
<link validity='sta' speed='2.5' width='1'/>
|
|
</pci-express>
|
|
</capability>
|
|
</device>
|