PCI controllers have an optional <code>model</code> attribute with
possible values <code>pci-root</code>, <code>pcie-root</code>,
<code>pci-bridge</code>, or <code>dmi-to-pci-bridge</code>.
+ (pci-root and pci-bridge <span class="since">since 1.0.5</span>,
+ pcie-root and dmi-to-pci-bridge <span class="since">since
+ 1.1.2</span>)
The root controllers (<code>pci-root</code> and <code>pcie-root</code>)
have an optional <code>pcihole64</code> element specifying how big
(in kilobytes, or in the unit specified by <code>pcihole64</code>'s
only refer to PCI buses provided by already specified PCI controllers.
Leaving gaps in the PCI controller indexes might lead to an invalid
configuration.
- (pci-root and pci-bridge <span class="since">since 1.0.5</span>)
</p>
<pre>
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