Linux system authoring driver under VM Virtual Machine cannot print information __linux

In the Linux system of the virtual machine to write Hello World driver can not print information at the end, the following is found on the Internet, the experiment is feasible:

This is a common problem with virtual machines. You can open a terminal and enter it on the terminal:
[Root@xxxxx] #while True
> Do
> cat/proc/kmsg
> Sleep 1
> Done

So your terminal is equivalent to a serial terminal, you can look at your printing information here

The effect is shown in the following illustration: