修改/etc/X11/xorg.conf，把缺的和少的都改一下，重启后可以用。但是大部分网站说将其中的ps/2改成IMPS/2就行。
Section "InputDevice"
Identifier "Configured Mouse"
Driver "vmmouse"
Option "Protocol" "ImPS/2"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection
