如果是mcs的方式創建的虛擬機，鼠標定位不準的問題通過下面的方法解決
•Get the uuid of your VM (ensure that xentools is installed)
•Shutdown the VM (otherwise, unexpected problems may occur)
•Open the console of sever and enter: xe vm-param-set uuid=<VM uuid> platform:usb=true platform:usb_tablet=true
•Start the VM: xe vm-start uuid=xxx