1，需求如下：短信机的使用的传统型的串口，想连接到业务，并能够根据业务设置发送短信。业务服务为kvm上运行的虚拟机，但kvm上没有添加usb1.0的接口，所以只能通过自己编写xml的方式，在挂载usb串口。

2，登录服务器使用如下命令查看usb的型号和类型：

[server1]#lsusb

Bus 002 Device 002: ID 8087:8002 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:800a Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 3689:8762  
Bus 003 Device 005: ID 096e:0006 Feitian Technologies, Inc.
Bus 003 Device 009: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

根据ID 0403:6001 Future Technology Devices International, Ltd 查找x相对应的Vendor和product。

[server1]#lsusb -v |grep 0403
idVendor           0x0403 Future Technology Devices International, Ltd

[server1]#lsusb -v |grep  6001
Bus 003 Device 009: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
  idProduct          0x6001 FT232 Serial (UART) IC

编写xm文件样例如下
[server1]#vim usb.xml

   <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x0403'/>
        <product id='0x6001'/>
        <!--address bus='3' device='3'/-->
      </source>
      <alias name='hostdev10'/>
    </hostdev>

使用virsh list查看虚拟机的uuid

[root@ceph-4 ~]# virsh list
 Id    Name                           State
----------------------------------------------------
 1     327066ab27f4463daaceb29d062ea486 running
 2     358b22f708f64253ba845f7c81faa703 running
 3     6e89ca538b19453e8a2858c5b429a8b9 running
 4     fcf3f0c092524488a58a4086b4f82a10 running

挂载usb设备给虚拟机

 挂载usb设备：virsh attach-device  fcf3f0c092524488a58a4086b4f82a10 usb.10.xml   

 卸载usb设备：virsh detach-device fcf3f0c092524488a58a4086b4f82a10 usb.10.xml