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由 Viktor Mihajlovski 提交于
For s390 we don't want to have a default USB device generated even if QEMU is silently tolerating -usb on the command line. This may change in the future. Another reason to avoid the USB controller is that it implies a PCI bus which might cause a regression at some later point in time. The following change will set the USB controller model to 'none' unless a model or address has been specified, which can be the case if a legacy definition is loaded or the XML writer knows what she/he's doing. Requiring the user to explicitly disable USB on systems not supporting it seems cumbersome. Signed-off-by: NViktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
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