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由 Laine Stump 提交于
This new function will add a single controller of the given model, except the case of ich9-usb-ehci1 (the master controller for a USB2 controller set) in which case a set of related controllers will be added (EHCI1, UHCI1, UHCI2, UHCI3). These controllers will not be given PCI addresses, but should be otherwise ready to use. "-1" is allowed for controller model, and means "default for this machinetype". This matches the existing practice in qemuDomainDefPostParse(), which always adds the default controller with model = -1, and relies on the commandline builder to set a model (that is wrong, but will be fixed later).
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