[求助]ubuntu中使用QEMU/KVM安装win7出现usb3.0不识别

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系统ubuntu-17.10 软件Virtual Machine Manager 1.4.0

使用KVM虚拟机安装了win7，在使用U盘拷贝文件时，USB2.0的u盘可以在win7中识别，而USB3.0的移动硬盘不能识别（可以在宿主机中识别），经过查找发现“查看->详情->控制程序USB”选项设置了USB2.0,但将其改为’管理程序默认‘时出现

更改 VM 配置出错：XML 错误：requested USB port 3 not present on USB bus 0

Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/addhardware.py", line 765, in change_config_helper
define_func(devobj=devobj, do_hotplug=False, **define_args)
File "/usr/share/virt-manager/virtManager/domain.py", line 961, in define_controller
self._redefine_xmlobj(xmlobj)
File "/usr/share/virt-manager/virtManager/libvirtobject.py", line 389, in _redefine_xmlobj
self._define(newxml)
File "/usr/share/virt-manager/virtManager/domain.py", line 1094, in _define
self.conn.define_domain(newxml)
File "/usr/share/virt-manager/virtManager/connection.py", line 678, in define_domain
return self._backend.defineXML(xml)
File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3621, in defineXML
if ret is None:raise libvirtError('virDomainDefineXML() failed', conn=self)
libvirtError: XML 错误：requested USB port 3 not present on USB bus 0

请问如何才能识别USB3.0