mirror of
https://gitlab.com/libvirt/libvirt.git
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1968f69b01
Signed-off-by: Andrea Bolognani <abologna@redhat.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com>
374 lines
15 KiB
ReStructuredText
374 lines
15 KiB
ReStructuredText
.. role:: since
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==============================
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Driver capabilities XML format
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==============================
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.. contents::
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Element and attribute overview
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------------------------------
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As new virtualization engine support gets added to libvirt, and to handle cases
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like QEMU supporting a variety of emulations, a query interface has been added
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in 0.2.1 allowing to list the set of supported virtualization capabilities on
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the host:
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::
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char * virConnectGetCapabilities (virConnectPtr conn);
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The value returned is an XML document listing the virtualization capabilities of
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the host and virtualization engine to which ```conn`` is connected. One can test
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it using ``virsh`` command line tool command '``capabilities``', it dumps the
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XML associated to the current connection.
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As can be seen in the `Examples`_, the capabilities XML
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consists of the ``capabilities`` element which have exactly one ``host`` child
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element to report information on host capabilities, and zero or more ``guest``
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element to express the set of architectures the host can run at the moment.
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Host capabilities
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~~~~~~~~~~~~~~~~~
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The ``<host/>`` element consists of the following child elements:
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``uuid``
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The host UUID.
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``cpu``
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The host CPU architecture and features.
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Note that, while this element contains a ``topology`` sub-element,
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the information contained therein is farily high-level and likely
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not very useful when it comes to optimizing guest vCPU placement.
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Look into the ``topology`` *element*, described below, for more
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detailed information.
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``power_management``
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whether host is capable of memory suspend, disk hibernation, or hybrid
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suspend.
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``migration_features``
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This element exposes information on the hypervisor's migration capabilities,
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like live migration, supported URI transports, and so on.
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``topology``
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This element describes the host CPU topology in detail.
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Management applications may want to use this information when defining new
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guests: for example, in order to ensure that all vCPUs are scheduled on
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CPUs that are in the same NUMA node or even CPU core.
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The ``cells`` sub-element contains a list of NUMA nodes, each one
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represented by a single ``cell`` element. Within each ``cell``, a ``cpus``
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sub-element contains a list of logical CPUs, each one represented by a
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single ``cpu`` element. In both cases, the ``num`` attribute of the
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top-level element contains the number of children.
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Each ``cpu`` element contains the following attributes:
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``id``
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CPU identifier. Can be used to refer to it in the context of
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`CPU tuning <formatdomain.html#cpu-tuning>`__.
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``socket_id``
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Identifier for the physical package the CPU is in.
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``die_id``
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Identifier for the die the CPU is in.
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Note that not all architectures support CPU dies: if the current
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architecture doesn't, the value will be 0 for all CPUs.
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``cluster_id``
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Identifier for the cluster the CPU is in.
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Note that not all architectures support CPU clusters: if the current
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architecture doesn't, the value will be 0 for all CPUs.
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``core_id``
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Identifier for the core the CPU is in.
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``siblings``
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List of CPUs that are in the same core.
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The list will include the current CPU, plus all other CPUs that have the
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same values for ``socket_id``, ``die_id``, ``cluster_id`` and ``core_id``.
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``secmodel``
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To find out default security labels for different security models you need to
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parse this element. In contrast with the former elements, this is repeated
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for each security model the libvirt daemon currently supports.
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Guest capabilities
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~~~~~~~~~~~~~~~~~~
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While the previous section (`Host capabilities`_) aims at host capabilities,
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this one focuses on capabilities available to a guest using a given hypervisor.
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The ``<guest/>`` element will typically wrap up the following elements:
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``os_type``
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This expresses what kind of operating system the hypervisor is able to run.
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Possible values are:
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``xen``
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for XEN PV
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``linux``
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legacy alias for ``xen``
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``xenpvh``
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for XEN PVH
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``hvm``
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Unmodified operating system
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``exe``
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Container based virtualization
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``arch``
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This element brings some information on supported guest architecture.
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Possible subelements are:
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``wordsize``
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Size of CPU word in bits, for example 64.
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``emulator``
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Emulator (device model) path, for use in
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`emulator <formatdomain.html#devices>`__ element of domain XML.
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``loader``
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Loader path, for use in `loader <formatdomain.html#bios-bootloader>`__
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element of domain XML.
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``machine``
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Machine type, for use in
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`machine <formatdomain.html#operating-system-booting>`__ attribute of
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os/type element in domain XML. For example Xen supports ``xenfv`` for HVM,
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``xenpv`` for PV, or ``xenpvh`` for PVH.
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``domain``
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The ``type`` attribute of this element specifies the type of hypervisor
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required to run the domain. Use in
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`type <formatdomain.html#element-and-attribute-overview>`__ attribute of
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the domain root element.
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``features``
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This optional element encases possible features that can be used with a guest
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of described type. Possible subelements are:
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``pae``
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If present, 32-bit guests can use PAE address space extensions,
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:since:`since 0.4.1`
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``nonpae``
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If present, 32-bit guests can be run without requiring PAE, :since:`since
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0.4.1`
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``ia64_be``
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If present, IA64 guests can be run in big-endian mode, :since:`since
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0.4.1`
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``acpi``
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If this element is present, the ``default`` attribute describes whether
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the hypervisor exposes ACPI to the guest by default, and the ``toggle``
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attribute describes whether the user can override this default.
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:since:`Since 0.4.1`
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``apic``
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If this element is present, the ``default`` attribute describes whether
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the hypervisor exposes APIC to the guest by default, and the ``toggle``
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attribute describes whether the user can override this default.
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:since:`Since 0.4.1`
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``cpuselection``
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If this element is present, the hypervisor supports the ``<cpu>`` element
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within a domain definition for fine-grained control over the CPU presented
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to the guest. :since:`Since 0.7.5`
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``deviceboot``
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If this element is present, the ``<boot order='...'/>`` element can be
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used inside devices, rather than the older boot specification by category.
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:since:`Since 0.8.8`
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``disksnapshot``
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If this element is present, the ``default`` attribute describes whether
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creating external disk snapshots is supported. If absent, creating external
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snapshots may still be supported, but it requires attempting the API and
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checking for an error to find out for sure. :since:`Since 1.2.3`
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``externalSnapshot``
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If this element is present, the hypervisor supports deleting and
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reverting external snapshots including memory state. Support for creation
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of external snapshots is reported via the ``disksnapshot`` feature flag.
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Management applications can now switch from internal snapshots to external
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snapshots. :since:`Since 9.9.0`
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Examples
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~~~~~~~~
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For example, in the case of a 64-bit machine with hardware virtualization
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capabilities enabled in the chip and BIOS you will see:
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::
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<capabilities>
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<host>
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<uuid>7b55704c-29f4-11b2-a85c-9dc6ff50623f</uuid>
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<cpu>
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<arch>x86_64</arch>
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<model>Skylake-Client-noTSX-IBRS</model>
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<vendor>Intel</vendor>
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<microcode version='236'/>
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<signature family='6' model='142' stepping='12'/>
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<counter name='tsc' frequency='2303997000' scaling='no'/>
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<topology sockets='1' dies='1' clusters='1' cores='4' threads='2'/>
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<maxphysaddr mode='emulate' bits='39'/>
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<feature name='ds'/>
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<feature name='acpi'/>
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<feature name='ss'/>
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<feature name='ht'/>
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<feature name='tm'/>
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<feature name='pbe'/>
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<feature name='dtes64'/>
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<feature name='monitor'/>
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<feature name='ds_cpl'/>
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<feature name='vmx'/>
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<feature name='smx'/>
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<feature name='est'/>
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<feature name='tm2'/>
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<feature name='xtpr'/>
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<feature name='pdcm'/>
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<feature name='osxsave'/>
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<feature name='tsc_adjust'/>
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<feature name='sgx'/>
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<feature name='clflushopt'/>
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<feature name='intel-pt'/>
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<feature name='md-clear'/>
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<feature name='stibp'/>
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<feature name='arch-capabilities'/>
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<feature name='ssbd'/>
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<feature name='xsaves'/>
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<feature name='sgx1'/>
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<feature name='sgx-debug'/>
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<feature name='sgx-mode64'/>
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<feature name='sgx-provisionkey'/>
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<feature name='sgx-tokenkey'/>
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<feature name='pdpe1gb'/>
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<feature name='invtsc'/>
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<feature name='rdctl-no'/>
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<feature name='ibrs-all'/>
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<feature name='skip-l1dfl-vmentry'/>
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<feature name='mds-no'/>
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<feature name='tsx-ctrl'/>
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<pages unit='KiB' size='4'/>
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<pages unit='KiB' size='2048'/>
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<pages unit='KiB' size='1048576'/>
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</cpu>
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<power_management>
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<suspend_mem/>
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</power_management>
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<iommu support='yes'/>
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<migration_features>
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<live/>
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<uri_transports>
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<uri_transport>tcp</uri_transport>
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<uri_transport>rdma</uri_transport>
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</uri_transports>
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</migration_features>
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<topology>
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<cells num='1'>
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<cell id='0'>
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<memory unit='KiB'>32498112</memory>
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<pages unit='KiB' size='4'>6813808</pages>
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<pages unit='KiB' size='2048'>2048</pages>
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<pages unit='KiB' size='1048576'>1</pages>
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<distances>
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<sibling id='0' value='10'/>
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</distances>
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<cpus num='8'>
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<cpu id='0' socket_id='0' die_id='0' cluster_id='0' core_id='0' siblings='0,4'/>
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<cpu id='1' socket_id='0' die_id='0' cluster_id='0' core_id='1' siblings='1,5'/>
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<cpu id='2' socket_id='0' die_id='0' cluster_id='0' core_id='2' siblings='2,6'/>
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<cpu id='3' socket_id='0' die_id='0' cluster_id='0' core_id='3' siblings='3,7'/>
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<cpu id='4' socket_id='0' die_id='0' cluster_id='0' core_id='0' siblings='0,4'/>
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<cpu id='5' socket_id='0' die_id='0' cluster_id='0' core_id='1' siblings='1,5'/>
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<cpu id='6' socket_id='0' die_id='0' cluster_id='0' core_id='2' siblings='2,6'/>
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<cpu id='7' socket_id='0' die_id='0' cluster_id='0' core_id='3' siblings='3,7'/>
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</cpus>
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</cell>
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</cells>
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</topology>
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<cache>
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<bank id='0' level='3' type='both' size='8' unit='MiB' cpus='0-7'/>
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</cache>
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<secmodel>
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<model>none</model>
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<doi>0</doi>
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</secmodel>
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<secmodel>
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<model>dac</model>
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<doi>0</doi>
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<baselabel type='kvm'>+77:+77</baselabel>
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<baselabel type='qemu'>+77:+77</baselabel>
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</secmodel>
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</host>
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<guest>
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<os_type>hvm</os_type>
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<arch name='x86_64'>
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<wordsize>64</wordsize>
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<emulator>/usr/bin/qemu-system-x86_64</emulator>
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<machine maxCpus='255'>pc-i440fx-7.1</machine>
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<machine canonical='pc-i440fx-7.1' maxCpus='255'>pc</machine>
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<machine maxCpus='288'>pc-q35-5.2</machine>
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<machine maxCpus='255'>pc-i440fx-2.12</machine>
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<machine maxCpus='255'>pc-i440fx-2.0</machine>
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<machine maxCpus='255'>pc-i440fx-6.2</machine>
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<machine maxCpus='288'>pc-q35-4.2</machine>
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<machine maxCpus='255'>pc-i440fx-2.5</machine>
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<machine maxCpus='255'>pc-i440fx-4.2</machine>
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<machine maxCpus='255'>pc-i440fx-5.2</machine>
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<machine maxCpus='255' deprecated='yes'>pc-i440fx-1.5</machine>
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<machine maxCpus='255'>pc-q35-2.7</machine>
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<machine maxCpus='288'>pc-q35-7.1</machine>
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<machine canonical='pc-q35-7.1' maxCpus='288'>q35</machine>
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<machine maxCpus='255'>pc-i440fx-2.2</machine>
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<machine maxCpus='255'>pc-i440fx-2.7</machine>
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<machine maxCpus='288'>pc-q35-6.1</machine>
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<machine maxCpus='255'>pc-q35-2.4</machine>
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<machine maxCpus='288'>pc-q35-2.10</machine>
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<machine maxCpus='1'>x-remote</machine>
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<machine maxCpus='288'>pc-q35-5.1</machine>
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<machine maxCpus='255' deprecated='yes'>pc-i440fx-1.7</machine>
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<machine maxCpus='288'>pc-q35-2.9</machine>
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<machine maxCpus='255'>pc-i440fx-2.11</machine>
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<machine maxCpus='288'>pc-q35-3.1</machine>
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<machine maxCpus='255'>pc-i440fx-6.1</machine>
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<machine maxCpus='288'>pc-q35-4.1</machine>
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<machine maxCpus='255'>pc-i440fx-2.4</machine>
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<machine maxCpus='255'>pc-i440fx-4.1</machine>
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<machine maxCpus='255'>pc-i440fx-5.1</machine>
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<machine maxCpus='255'>pc-i440fx-2.9</machine>
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<machine maxCpus='1'>isapc</machine>
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<machine maxCpus='255' deprecated='yes'>pc-i440fx-1.4</machine>
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<machine maxCpus='255'>pc-q35-2.6</machine>
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<machine maxCpus='255'>pc-i440fx-3.1</machine>
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<machine maxCpus='288'>pc-q35-2.12</machine>
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<machine maxCpus='288'>pc-q35-7.0</machine>
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<machine maxCpus='255'>pc-i440fx-2.1</machine>
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<machine maxCpus='288'>pc-q35-6.0</machine>
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<machine maxCpus='255'>pc-i440fx-2.6</machine>
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<machine maxCpus='288'>pc-q35-4.0.1</machine>
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<machine maxCpus='255'>pc-i440fx-7.0</machine>
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<machine maxCpus='255' deprecated='yes'>pc-i440fx-1.6</machine>
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<machine maxCpus='288'>pc-q35-5.0</machine>
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<machine maxCpus='288'>pc-q35-2.8</machine>
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<machine maxCpus='255'>pc-i440fx-2.10</machine>
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<machine maxCpus='288'>pc-q35-3.0</machine>
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<machine maxCpus='255'>pc-i440fx-6.0</machine>
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<machine maxCpus='288'>pc-q35-4.0</machine>
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<machine maxCpus='288'>microvm</machine>
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<machine maxCpus='255'>pc-i440fx-2.3</machine>
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<machine maxCpus='255'>pc-i440fx-4.0</machine>
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<machine maxCpus='255'>pc-i440fx-5.0</machine>
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<machine maxCpus='255'>pc-i440fx-2.8</machine>
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<machine maxCpus='288'>pc-q35-6.2</machine>
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<machine maxCpus='255'>pc-q35-2.5</machine>
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<machine maxCpus='255'>pc-i440fx-3.0</machine>
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<machine maxCpus='288'>pc-q35-2.11</machine>
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<domain type='qemu'/>
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<domain type='kvm'/>
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</arch>
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<features>
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<acpi default='on' toggle='yes'/>
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<apic default='on' toggle='no'/>
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<cpuselection/>
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<deviceboot/>
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<disksnapshot default='on' toggle='no'/>
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<externalSnapshot/>
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</features>
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</guest>
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</capabilities>
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