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libvirt: Domain XML format

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61 Minutes, 27 Seconds

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guest ✓ address ✓ host ✓ pci ✓ controller ✓ QEMU ✓ disk ✓ attribute ✓ device ✓ bus ✓ attributes ✓ type ✓ optional ✓ devices ✓ element

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Configured in this manner, the LUN behaves identically to disk, except that generic SCSI commands from the guest are accepted and passed through to the physical device. This setting resembles the behaviour of 9pfs prior to QEMU 4.2, that is no action is performed to prevent any potential file ID collisions if an export contains multiple devices, with the only exception: a warning is logged (once) on host side now. Rather than having the hypervisor directly communicate with the host, it is possible to tunnel all requests through a secondary character device to a third-party provider (which may in turn be talking to a smartcard or using three certificate files).

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<p style="display: none;"> <script type="application/ld+json">{ "@context": "https://schema.org", "@type": "Article", "image": { "@type": "ImageObject", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "name": "Article", "url": "https://www.artikelschreiber.com/en/", "description": "libvirt virtualization virtualization API ... https://www.artikelschreiber.com/en/", "headline": "libvirt: Domain XML format", "dateCreated": "2022-01-18T03:20:17+01:00", "datePublished": "2022-01-18T03:20:17+01:00", "dateModified": "2022-01-18T03:20:17+01:00", "articleBody": "Configured in this manner the LUN behaves identically to disk except that generic SCSI commands from the guest are accepted and passed through to the physical device. This setting resembles the behaviour of 9pfs prior to QEMU 4.2 that is no action is performed to prevent any potential file ID collisions if an export contains multiple devices with the only exception: a warning is logged (once) on host side now. Rather than having the hypervisor directly communicate with the host it is possible to tunnel all requests through a secondary character device to a third-party provider (which may in turn be talking to a smartcard or using three certificate files). Source: https://www.artikelschreiber.com/en/.", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://www.artikelschreiber.com/en/#webpage" }, "publisher": { "@type": "Organization", "@id": "https://www.artikelschreiber.com/en/#organization", "url": "https://www.artikelschreiber.com/en/", "name": "ArtikelSchreiber.com", "description": "Your free SEO text generator | ArtikelSchreiber.com", "logo": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "image": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "sameAs": [ "https://www.unaique.net/" ] }, "keywords": "guest, address, host, pci, controller, QEMU, disk, attribute, device, bus, attributes, type, optional, devices, element", "author": { "@type": "Person", "name": "ArtikelSchreiber.com", "url": "https://www.artikelschreiber.com/en/", "sameAs": [ "https://www.unaique.net/" ] }, "@id": "https://www.artikelschreiber.com/en/#links", "commentCount": "0", "sameAs": [ "https://www.artikelschreiber.com/", "https://www.artikelschreiber.com/en/", "https://www.artikelschreiber.com/es/", "https://www.artikelschreiber.com/fr", "https://www.artikelschreiber.com/it", "https://www.artikelschreiber.com/ru/", "https://www.artikelschreiber.com/zh", "https://www.artikelschreiber.com/jp/", "https://www.artikelschreiber.com/ar", "https://www.artikelschreiber.com/hi/", "https://www.artikelschreiber.com/pt/" ], "speakable": { "@type": "SpeakableSpecification", "xpath": [ "/html/head/title", "/html/head/meta[@name='description']/@content" ] } } </script> </p><br /><br /> libvirt, virtualization, virtualization API
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<p style="display: none;"> <script type="application/ld+json">{ "@context": "https://schema.org", "@type": "Article", "image": { "@type": "ImageObject", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "name": "Article", "url": "https://www.artikelschreiber.com/en/", "description": "libvirt virtualization virtualization API ... https://www.artikelschreiber.com/en/", "headline": "libvirt: Domain XML format", "dateCreated": "2022-01-18T03:20:17+01:00", "datePublished": "2022-01-18T03:20:17+01:00", "dateModified": "2022-01-18T03:20:17+01:00", "articleBody": "The emulator element is a set of elements that describe the emulator capabilities of the guest domain. Returns a unique identifier for the physical block size of the disk. The auth element is a sub-element of the source element and describes the smallest units for disk I/O. Source: https://www.artikelschreiber.com/en/.", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://www.artikelschreiber.com/en/#webpage" }, "publisher": { "@type": "Organization", "@id": "https://www.artikelschreiber.com/en/#organization", "url": "https://www.artikelschreiber.com/en/", "name": "ArtikelSchreiber.com", "description": "Your free SEO text generator | ArtikelSchreiber.com", "logo": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "image": { "@type": "ImageObject", "@id": "https://www.artikelschreiber.com/en/#logo", "url": "https://www.artikelschreiber.com/images/logo.png", "width": 531, "height": 628 }, "sameAs": [ "https://www.unaique.net/" ] }, "keywords": "guest, address, host, pci, controller, QEMU, disk, attribute, device, bus, attributes, type, optional, devices, element", "author": { "@type": "Person", "name": "ArtikelSchreiber.com", "url": "https://www.artikelschreiber.com/en/", "sameAs": [ "https://www.unaique.net/" ] }, "@id": "https://www.artikelschreiber.com/en/#links", "commentCount": "0", "sameAs": [ "https://www.artikelschreiber.com/", "https://www.artikelschreiber.com/en/", "https://www.artikelschreiber.com/es/", "https://www.artikelschreiber.com/fr", "https://www.artikelschreiber.com/it", "https://www.artikelschreiber.com/ru/", "https://www.artikelschreiber.com/zh", "https://www.artikelschreiber.com/jp/", "https://www.artikelschreiber.com/ar", "https://www.artikelschreiber.com/hi/", "https://www.artikelschreiber.com/pt/" ], "speakable": { "@type": "SpeakableSpecification", "xpath": [ "/html/head/title", "/html/head/meta[@name='description']/@content" ] } } </script> </p><br /><br /> The emulator element is a set of elements that describe the emulator capabilities of the guest domain. Returns a unique identifier for the physical block size of the disk. The auth element is a sub-element of the source element and describes the smallest units for disk I/O. The address element of the disk controller is optional, but must be present. This element is used to specify a virtual hard disk or CD-ROM device. The serial element of a virtual hard disk or CD-ROM drive must be at least 16 digits long. The serial number of a virtual hard drive is determined by the device type 'SATA', 'scsi' or 'scsi-block'. A disk transient is a temporary loss of data on a hard drive. The attribute device='cdrom' should be set to true by default in libvirt 3. The volume attribute is used to determine whether a disk is present in the boot sequence. How do I set up the hypervisor to boot to a specific device? The qcow2 format driver of the qemu hypervisor can be controlled via the max_size subelement. The "iothreads" attribute controls whether to assign a single IO to a single disk. The first two values ("map" and "ignore"), are used to detect areas in an image that are not visible to the naked eye. The optional discard attribute controls whether to discard an image file. copy-on-read is a feature in QEMU that allows a guest to copy a file from one device to another. The qemu-ioeventfd attribute allows users to set domain I/O asynchronous handling for disk device. The optional ioeventfd attribute allows users to set domain I/O asynchronous handling for disk device. If you are running a large number of virtual machines on a single host, you might want to consider using this option to reduce the likelihood of guest I/O latency. rerror_policy controls the behaviour of the hypervisor for write errors. The "writethrough" function caches requests to the disk io and writes them back to the host page. Xen and qemu both support the option to specify a name for a group of partitions. The following example shows how to specify the maximum read and write limits for a file. This element controls the I/O throttling for the guest OS. This library emulates disk devices using either a SCSI or a USB bus. The optional attribute tray sets the tray flag for USB disks, and its value can be either "on" or "off", defaulting to "off". The values of the following storage attributes are derived from the values of the underlying host storage. The mirror element of the virDomainBlockCommit API is used to mirror the virDomainBlockRebase API to the source disk of the virDomainBlockCommit API. If ready, the disk is copying. virDomainBlockRebase contains a backing store element called vda. This element describes the backing store used by the disk specified by sibling source element. The following attributes are supported in backingStore. Guest cold bootup and migration are not supported by the current release. This element is used to provide information on the configuration of the user and group. The following values are used to specify the user and group element of the curl driver: The cookie element allows to pass one or more cookies. The size of the initiator element and the offset and size of the source element are given in bytes. libvirt has an element called libvirt-persistent. libvirt supports persistent reservations for encryption. The following documentation describes the use of the auth element in the Kerberos authentication system. A secret object is a file containing a key that can be used to authenticate a target. snapshot element can optionally specify an internal snapshot name to be used as the source for storage protocols. The name attribute of snapshot element can optionally specify an internal snapshot name to be used as the source for storage protocols. The nfs kernel provides a way to specify the hosts to connect to the source disk. seclabel is a property of the source file system that can be used to override the domain security labeling policy for just that source file. This disk type is not supported by the hypervisor due to the fact that it does not support the following: This method can be used to pass the source of a disk to the kernel, since the disk is not the source of the kernel's storage stack. Using "host" as the mode value indicates to use the's path as it shows up on host (e.g. 'file=/dev/disk/by-path/ip-example.com:3260-iscsi-iqn. virsh vol-list [pool-name] returns the name of the underlying disk source. The VxHS name attribute is used to specify the volume of data that will be sent to the block device. libvirt will use the qemu TLS environment if vxhs_tls is enabled. The nbd_tls attribute can be used to specify a TLS environment for a pool (i.e. Returns the name of the volume or image that will be used for the snapshot. snapshots is a utility that allows administrators to specify how often snapshots should be created. This attribute is used to specify whether rawio should be enabled for a disk in a domain. The Virtio driver for the QEMU operating system is currently under development. The following is a list of the most common types of "lun" used in the following commands: Note that device='lun' will only be recognized for raw devices, but never for individual partitions or LVM partitions (in those cases, the kernel will reject the generic SCSI commands, making it identical to device='disk'). Also note that device='lun' will only be recognized for actual raw devices, but never for individual partitions or LVM partitions (in those cases, the kernel will reject the generic SCSI commands, making it identical to device='disk'). The term "hostuser" is used to refer to the user ( since 0. The following is a list of all the spaces in the guest container. The virtiofsd attribute can be used to connect to a virtiofsd launched outside of libvirtd. The virtiofsd class can be used to control the actions of the game engine. virtiofsd is a wrapper around virtiofsd, which can be used to create sandboxed applications. The Virtuozzo drivers support a variety of formats. Only allow to access one device per export by guest. The element virtiofs exports devices containing more than one device. QEMU creates files with mode 600 and directories with mode 700 if not specified (see QEMU 1. If not specified, QEMU creates files with mode 600 and directories with mode 700. The QEMU/KVM accessmode element specifies the source accessmode for accessing the driver source. A host file will be treated as an image and mounted in the guest. The guest file writeback mode allows a page to be written to a guest file, but only if the page's cache is set to false. Libvirt uses virtiofs to manage the device as a regular PCI hostdev. libvirt uses virtio-mmio addresses to identify the device in the guest configuration. The Virtio-ccw bus address is a bus address set by libvirt. The SPAPR-VIO bus is a 32-bit bus used by libvirt to communicate with PowerPC pseries guests. The control register for qemu contains the following attributes: The following documentation explains how to use the QEMU graphics driver to control the graphics card's functions (Fig. This document describes how to assign a PCI address to a hypervisor device. The address type of a guest device is determined by the address type of the device itself. libvirt will generate a notification page for each virtio queue exposed to the guest. The virtqueues attribute controls if QEMU should try to use virtqueues. QEMU's virtio drivers use packed virtqueues to transport virtual machines between QEMU backends and guest drivers. The device virtio is defined in the virtio specification. The virtio-transitional device is a replacement for the virtio-non-transitional device. libvirt is the default guest driver for the virtio 0. Controllers can be added to a domain with an implicit pcie-root by calling model='pcie-switch-upstream-port', model='pcie-switch-downstream-port', or model='pcie-root-port'. The pcie-root controller with index=0 is auto-added to the domain's configuration. pcie-root supports hotplugged devices in the guest configuration. The dmi-to-pci-bridge is a low-cost, easy-to-use bridge between two computers. pci-root is a controller which implements the PCI bus. The following example shows how to create a new pSeries guest with no gaps in the PCI controller indexes. An algorithm is used to automatically determine the busNr attribute for the pcie-root-port that must necessarily be connected to the bus in order to actually plug in an endpoint device. A new expander bus has been added to the root-bus of the pci-expander-bus controller. This setting affects the ACPI based hotplugs for the following controllers: pci-root (Since 7. 0), pcie-root-port (Since 6. The hotplug attribute in the subelement of the pcie-root-port controller is used to set the hotplug configuration value for the controller. The chassisNr attribute in the libvirt subelement is used to control QEMU's "chassis_nr" option for the pci-bridge device (normally libvirt automatically sets this to the same value as the index attribute of the pci controller). There are two main subelements of a QEMU controller. The libvirt root controller should be the same as the libvirt root controller. libvirt supports USB companion controllers. The following code snippet shows how to assign SCSI disks to an IO controller. The ioeventfd controller implements the following functions. The following examples show how to use the optional queues attribute to specify the number of queues for a controller. 1. The following example shows how to control a Raspberry Pi with a keyboard and mouse. The default USB controller on s390 will be built on "qemu-xhci" (or "qemu-xhci", since 0. The virtio-serial controller supports an optional attribute model which can be 'virtio', 'virtio-transitional', or 'virtio-non-transitional'. A controller is a virtual device that can control other virtual devices. This method returns a list of the lockspaces associated with the file associated with the key held in the lockspace. A lock manager for controlling a device against a virtual machine (VM). The hostdev element can be used to pass through a host network interface to a guest device. Only supported by SCSI host device. Device assignment will fail if the requested method of device assignment isn't available on the host (i.e. The address attribute of the nodedev-list element is a list of attributes that can be used to designate a device. The address element is used to specify the device's address space in the guest's memory map. The following documentation describes the use of the optional file attribute in QEMU to provide a virtual boot ROM for a device that has no ROMs for the VFs. The boot sequence for a device is defined in the following way: The hostfs of a SCSI HBA are defined by a set of ids that can be given to the hostfs. SCSI devices are described by the adapter attribute and the address element. Xen does not support write access to the PCI configuration space. The source element of USB devices may contain startupPolicy attribute which can be used to define policy what to do if the specified host USB device is not found. Guest's address is ignored by all other device types. This section describes how to create a mediated device on the host using model='vfio-ap' ( Since 4. 0 ) and model='vfio-ap' ( Since 4. The 'vfio-pci' attribute can be used to specify the graphics card's framebuffer size. This attribute defines a memory framebuffer device to be used as a boot display when a vgpu device is the primary display. If supported by the hypervisor and OS, the optional sgio ( since 1 ) attribute indicates whether unprivileged SG_IO commands are filtered for the disk, where the default is "filtered". 6 ) attribute indicates whether unprivileged SG_IO commands are filtered for the disk, where the default is "filtered". rawio can be set to "managed". The following examples show how to pass devices from a host to a guest using the hostdev element. The USBFilter class is a wrapper around the bcdFilter class. The per-device element defines the order in which devices are tried during boot. The redirdev element can be used to define a character device, such as a ccid bus controller. Virtual private network (VPN) tunnels allow hypervisors to communicate with hosts over the internet. The following examples show how to provide three NSS certificate names to a hypervisor. The simplest operation, where the hypervisor relays all requests from the guest into direct access to the host's smartcard via NSS. The simplest operation, where the hypervisor relays all requests from the guest into direct access to the host's smartcard via NSS. A USB smartcard element can be used on a guest computer. The guest interface property trustGuestRxFilters provides the capability for the host to detect and trust reports from the guest regarding changes to the interface mac address and receive filters by setting the attribute to yes. libvirt has a number of interfaces that can be used to connect to VMware virtual machines. The ACPI index is used to identify devices on a network. A virtual network is a network that is not physically connected to a physical host. A virtual network is a set of protocols that can be used to connect to a physical network. The vnetN element defines an interface between two guest devices. virNetworkPortPtr is an attribute of the virNetwork interface. A virtual switch is a network interface that connects to a physical switch ( Since 0. A virtualport is a set of attributes that can be defined in a virtual machine. You can specify the type of virtualport used to connect to the interface by using the following command. This element is used to create a bridge between a VM and a LAN. An Open vSwitch bridge device is a device that connects to an Open vSwitch host. The 'midonet' bridge device can be used to connect to hosts that support Open vSwitch on the kernel side and have the Midonet Host Agent configured, it is also possible to connect to the 'midonet' bridge device by adding a to the interface definition. The following example shows how to set up a virtual LAN with NAT to the outside world. The following example shows how to set up a private IPv4 network on a virtual machine. A list of all the addresses that you can specify for your website. libvirt will create a new tap device with a name of the pattern "vnetN", where "N" is replaced with a number. libvirtd's managed='no' option is no longer supported.
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