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由 Ján Tomko 提交于
A new type to track USB addresses. Every <controller type='usb' index='i'/> is represented by an object of type virDomainUSBAddressHub located at buses[i]. Each of these hubs has up to 'nports' ports. If a port is occupied, it has the corresponding bit set in the 'ports' bitmap, e.g. port 1 would have the 0th bit set. If there is a hub on this port, then hubs[i] will point to this hub.
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