Red Hat Summit Red Hat SummitSupportConsoleDéveloppeursCommencer un essaiContact

Ce contenu n'est pas disponible dans la langue sélectionnée.

9.4. Setting Addresses for Devices

Many devices have an optional <address> sub-element which is used to describe where the device is placed on the virtual bus presented to the guest virtual machine. If an address (or any optional attribute within an address) is omitted on input, libvirt will generate an appropriate address; but an explicit address is required if more control over layout is required. See Figure 9.6, “XML example for PCI device assignment” for domain XML device examples including an <address> element.
Every address has a mandatory attribute type that describes which bus the device is on. The choice of which address to use for a given device is constrained in part by the device and the architecture of the guest virtual machine. For example, a <disk> device uses type='drive', while a <console> device would use type='pci' on i686 or x86_64 guest virtual machine architectures. Each address type has further optional attributes that control where on the bus the device will be placed as described in the table:
Expand
Table 9.1. Supported device address types
Address type Description
type='pci' PCI addresses have the following additional attributes:
  • domain (a 2-byte hex integer, not currently used by qemu)
  • bus (a hex value between 0 and 0xff, inclusive)
  • slot (a hex value between 0x0 and 0x1f, inclusive)
  • function (a value between 0 and 7, inclusive)
  • multifunction controls turning on the multifunction bit for a particular slot/function in the PCI control register By default it is set to 'off', but should be set to 'on' for function 0 of a slot that will have multiple functions used.
type='drive' Drive addresses have the following additional attributes:
  • controller (a 2-digit controller number)
  • bus (a 2-digit bus number
  • target (a 2-digit bus number)
  • unit (a 2-digit unit number on the bus)
type='virtio-serial' Each virtio-serial address has the following additional attributes:
  • controller (a 2-digit controller number)
  • bus (a 2-digit bus number)
  • slot (a 2-digit slot within the bus)
type='ccid' A CCID address, for smart-cards, has the following additional attributes:
  • bus (a 2-digit bus number)
  • slot attribute (a 2-digit slot within the bus)
type='usb' USB addresses have the following additional attributes:
  • bus (a hex value between 0 and 0xfff, inclusive)
  • port (a dotted notation of up to four octets, such as 1.2 or 2.1.3.1)
type='isa' ISA addresses have the following additional attributes:
  • iobase
  • irq
Retour au début
Red Hat logoGithubredditYoutubeTwitter

Apprendre

Essayez, achetez et vendez

Communautés

À propos de la documentation Red Hat

Nous aidons les utilisateurs de Red Hat à innover et à atteindre leurs objectifs grâce à nos produits et services avec un contenu auquel ils peuvent faire confiance. Découvrez nos récentes mises à jour.

Rendre l’open source plus inclusif

Red Hat s'engage à remplacer le langage problématique dans notre code, notre documentation et nos propriétés Web. Pour plus de détails, consultez le Blog Red Hat.

À propos de Red Hat

Nous proposons des solutions renforcées qui facilitent le travail des entreprises sur plusieurs plates-formes et environnements, du centre de données central à la périphérie du réseau.

Theme

© 2025 Red Hat