<p>
Each controller has a mandatory attribute <code>type</code>,
- which must be one of "ide", "fdc", "scsi", "sata", "usb",
- "ccid", "virtio-serial" or "pci", and a mandatory
+ which must be one of 'ide', 'fdc', 'scsi', 'sata', 'usb',
+ 'ccid', 'virtio-serial' or 'pci', and a mandatory
attribute <code>index</code> which is the decimal integer
describing in which order the bus controller is encountered (for
- use in <code>controller</code> attributes
- of <code><address></code> elements). The "virtio-serial"
- controller has two additional optional
- attributes <code>ports</code> and <code>vectors</code>, which
- control how many devices can be connected through the
- controller. A "scsi" controller has an optional
- attribute <code>model</code>, which is one of "auto", "buslogic",
- "ibmvscsi", "lsilogic", "lsisas1068", "lsisas1078", "virtio-scsi" or
- "vmpvscsi". A "usb" controller has an optional attribute
- <code>model</code>, which is one of "piix3-uhci", "piix4-uhci", "ehci",
- "ich9-ehci1", "ich9-uhci1", "ich9-uhci2", "ich9-uhci3", "vt82c686b-uhci",
- "pci-ohci" or "nec-xhci". Additionally,
- <span class="since">since 0.10.0</span>, if the USB bus needs to be
- explicitly disabled for the guest, <code>model='none'</code> may be
- used. <span class="since">Since 1.0.5</span>, no default USB controller
- will be built on S390. <span class="since">Since 1.3.5</span>, USB
- controllers accept a <code>ports</code> attribute to configure how
- many devices can be connected to the controller. The PowerPC64
- "spapr-vio" addresses do not have an associated controller.
+ use in <code>controller</code> attributes of
+ <code><address></code> elements). Some controller types
+ have additional attributes that control specific features, such as:
+ </p>
+
+ <dl>
+ <dt><code>virtio-serial</code></dt>
+ <dd>The <code>virtio-serial</code> controller has two additional
+ optional attributes <code>ports</code> and <code>vectors</code>,
+ which control how many devices can be connected through the
+ controller.</dd>
+ <dt><code>scsi</code></dt>
+ <dd>A <code>scsi</code> controller has an optional attribute
+ <code>model</code>, which is one of 'auto', 'buslogic', 'ibmvscsi',
+ 'lsilogic', 'lsisas1068', 'lsisas1078', 'virtio-scsi' or
+ 'vmpvscsi'.</dd>
+ <dt><code>usb</code></dt>
+ <dd>A <code>usb</code> controller has an optional attribute
+ <code>model</code>, which is one of "piix3-uhci", "piix4-uhci",
+ "ehci", "ich9-ehci1", "ich9-uhci1", "ich9-uhci2", "ich9-uhci3",
+ "vt82c686b-uhci", "pci-ohci" or "nec-xhci". Additionally,
+ <span class="since">since 0.10.0</span>, if the USB bus needs to
+ be explicitly disabled for the guest, <code>model='none'</code>
+ may be used. <span class="since">Since 1.0.5</span>, no default
+ USB controller will be built on s390.
+ <span class="since">Since 1.3.5</span>, USB controllers accept a
+ <code>ports</code> attribute to configure how many devices can be
+ connected to the controller.</dd>
+ </dl>
+
+ <p>
+ Note: The PowerPC64 "spapr-vio" addresses do not have an
+ associated controller.
</p>
<p>