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docs: document <address> elements in one place
Improve the documentation of what forms a valid <address> element, since these elements appear in numerous devices. * docs/formatdomain.html.in (elementsAddress): New section. (elementsControllers, elementsUSB, elementsNICS, elementsInput) (elementsHub, elementsCharChannel, elementsSound): Refer to it.
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Eric Blake
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@ -1404,12 +1404,90 @@
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</dd>
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</dl>
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<h4><a name="elementsAddress">Device Addresses</a></h4>
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<p>
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Many devices have an optional <code><address></code>
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sub-element to describe where the device is placed on the
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virtual bus presented to the guest. If an address (or any
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optional attribute within an address) is omitted on
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input, libvirt will generate an appropriate address; but an
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explicit address is required if more control over layout is
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required. See below for device examples including an address
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element.
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</p>
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<p>
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Every address has a mandatory attribute <code>type</code> that
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describes which bus the device is on. The choice of which
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address to use for a given device is constrained in part by the
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device and the architecture of the guest. For example,
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a <code><disk></code> device
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uses <code>type='disk'</code>, while
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a <code><console></code> device would
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use <code>type='pci'</code> on i686 or x86_64 guests,
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or <code>type='spapr-vio'</code> on PowerPC64 pseries guests.
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Each address type has further optional attributes that control
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where on the bus the device will be placed:
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</p>
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<dl>
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<dt><code>type='pci'</code></dt>
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<dd>PCI addresses have the following additional
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attributes: <code>domain</code> (a 2-byte hex integer, not
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currently used by qemu), <code>bus</code> (a hex value between
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0 and 0xff, inclusive), <code>slot</code> (a hex value between
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0x0 and 0x1f, inclusive), and <code>function</code> (a value
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between 0 and 7, inclusive). Also available is
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the <code>multifunction</code> attribute, which controls
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turning on the multifunction bit for a particular
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slot/function in the PCI control register
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(<span class="since">since 0.9.7, requires QEMU
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0.13</span>). <code>multifunction</code> defaults to 'off',
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but should be set to 'on' for function 0 of a slot that will
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have multiple functions used.
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</dd>
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<dt><code>type='drive'</code></dt>
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<dd>Drive addresses have the following additional
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attributes: <code>controller</code> (a 2-digit controller
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number), <code>bus</code> (a 2-digit bus number),
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and <code>unit</code> (a 2-digit unit number on the bus).
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</dd>
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<dt><code>type='virtio-serial'</code></dt>
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<dd>Each virtio-serial address has the following additional
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attributes: <code>controller</code> (a 2-digit controller
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number), <code>bus</code> (a 2-digit bus number),
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and <code>slot</code> (a 2-digit slot within the bus).
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</dd>
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<dt><code>type='ccid'</code></dt>
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<dd>A CCID address, for smart-cards, has the following
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additional attributes: <code>bus</code> (a 2-digit bus
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number), and <code>slot</code> attribute (a 2-digit slot
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within the bus). <span class="since">Since 0.8.8.</span>
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<dt><code>type='usb'</code></dt>
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<dd>USB addresses have the following additional
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attributes: <code>bus</code> (a hex value between 0 and 0xfff,
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inclusive), and <code>port</code> (a dotted notation of up to
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four octets, such as 1.2 or 2.1.3.1).
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</dd>
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<dt><code>type='spapr-vio'</code></dt>
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<dd>On PowerPC pseries guests, devices can be assigned to the
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SPAPR-VIO bus. It has a flat 64-bit address space; by
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convention, devices are generally assigned at a non-zero
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multiple of 0x1000, but other addresses are valid and
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permitted by libvirt. Each address has the following
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additional attribute: <code>reg</code> (the hex value address
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of the starting register). <span class="since">Since
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0.9.9.</span>
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</dd>
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</dl>
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<h4><a name="elementsControllers">Controllers</a></h4>
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<p>
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Many devices that have an <code><address></code>
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sub-element are designed to work with a controller to manage
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related devices. Normally, libvirt can automatically infer such
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Depending on the guest architecture, some device busses can
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appear more than once, with a group of virtual devices tied to a
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virtual controller. Normally, libvirt can automatically infer such
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controllers without requiring explicit XML markup, but sometimes
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it is necessary to provide an explicit controller element.
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</p>
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@ -1443,15 +1521,15 @@
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A "usb" controller has an optional attribute <code>model</code>,
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which is one of "piix3-uhci", "piix4-uhci", "ehci",
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"ich9-ehci1", "ich9-uhci1", "ich9-uhci2", "ich9-uhci3",
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"vt82c686b-uhci" or "pci-ohci".
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"vt82c686b-uhci" or "pci-ohci". The PowerPC64 "spapr-vio"
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addresses do not have an associated controller.
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</p>
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<p>
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For controllers that are themselves devices on a PCI or USB bus,
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an optional sub-element <code><address></code> can specify
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the exact relationship of the controller to its master bus, with
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semantics like any other device's <code>address</code>
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sub-element.
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semantics <a href="#elementsAddress">given above</a>.
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</p>
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<p>
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@ -1608,19 +1686,9 @@
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(starting with 0x) or octal (starting with 0) form.
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For PCI devices the element carries 3 attributes allowing to designate
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the device as can be found with the <code>lspci</code> or
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with <code>virsh nodedev-list</code>. The
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<code>bus</code> attribute allows the hexadecimal values 0 to ff, the
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<code>slot</code> attribute allows the hexadecimal values 0 to 1f, and
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the <code>function</code> attribute allows the hexadecimal values 0 to 7.
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The <code>multifunction</code> attribute controls turning on the
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multifunction bit for a particular slot/function in the PCI
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control register<span class="since">since 0.9.7, requires QEMU
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0.13</span>. <code>multifunction</code> defaults to 'off', but
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should be set to 'on' for function 0 of a slot that will have
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multiple functions used.
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There is also an optional <code>domain</code> attribute for
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the PCI domain, with hexadecimal values 0 to ffff, but it is
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currently not used by qemu.</dd>
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with <code>virsh
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nodedev-list</code>. <a href="#elementsAddress">See above</a> for
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more details on the address element.
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</dl>
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<h4><a name="elementsRedir">Redirected devices</a></h4>
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@ -1756,12 +1824,9 @@
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<p>
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Each mode supports an optional
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sub-element <code><address></code>, which fine-tunes the
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correlation between the smartcard and a ccid bus controller.
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If present, the element must have an attribute
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of <code>type='ccid'</code> as well as a <code>bus</code>
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attribute listing the index of the bus that the smartcard
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utilizes. An optional <code>slot</code> attribute lists which
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slot within the bus. For now, qemu only supports at most one
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correlation between the smartcard and a ccid bus
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controller, <a href="#elementsAddress">documented above</a>.
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For now, qemu only supports at most one
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smartcard, with an address of bus=0 slot=0.
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</p>
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@ -1786,10 +1851,8 @@
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each <code><interface></code> element has an
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optional <code><address></code> sub-element that can tie
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the interface to a particular pci slot, with
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attribute <code>type='pci'</code> and additional
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attributes <code>domain</code>, <code>bus</code>, <code>slot</code>,
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<code>function</code>, and <code>multifunction</code>
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<span class="since">since 0.9.7, requires QEMU 0.13</span> as appropriate.
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attribute <code>type='pci'</code>
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as <a href="#elementsAddress">documented above</a>.
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</p>
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<h5><a name="elementsNICSVirtual">Virtual network</a></h5>
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@ -2387,7 +2450,8 @@ qemu-kvm -net nic,model=? /dev/null
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<p>
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The <code>input</code> element has an optional
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sub-element <code><address></code> which can tie the
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device to a particular PCI slot.
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device to a particular PCI
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slot, <a href="#elementsAddress">documented above</a>.
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</p>
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<h4><a name="elementsHub">Hub devices</a></h4>
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@ -2413,8 +2477,10 @@ qemu-kvm -net nic,model=? /dev/null
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<p>
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The <code>hub</code> element has an optional
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sub-element <code><address></code> which can tie the
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device to a particular controller.
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sub-element <code><address></code>
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with <code>type='usb'</code>which can tie the device to a
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particular controller, <a href="#elementsAddress">documented
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above</a>.
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</p>
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<h4><a name="elementsGraphics">Graphical framebuffers</a></h4>
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@ -2876,7 +2942,8 @@ qemu-kvm -net nic,model=? /dev/null
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/dev/virtio-ports/$name (for more info, please see
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<a href="http://fedoraproject.org/wiki/Features/VirtioSerial">http://fedoraproject.org/wiki/Features/VirtioSerial</a>). The
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optional element <code>address</code> can tie the channel to a
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particular <code>type='virtio-serial'</code> controller.
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particular <code>type='virtio-serial'</code>
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controller, <a href="#elementsAddress">documented above</a>.
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<span class="since">Since 0.7.7</span></dd>
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<dt><code>spicevmc</code></dt>
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@ -3152,7 +3219,8 @@ qemu-kvm -net nic,model=? /dev/null
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<p>
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Each <code>sound</code> element has an optional
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sub-element <code><address></code> which can tie the
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device to a particular PCI slot.
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device to a particular PCI
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slot, <a href="#elementsAddress">documented above</a>.
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</p>
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<h4><a name="elementsWatchdog">Watchdog device</a></h4>
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