I want to implement a print function in HYP mode to let the VMM to print some information.
Now I know there are only some asm code in HYP mode. So if I want to move all print funciton code into HYP mode may be complex.
Others advise me that I can create an upcall mechanism to call print function in kernel. But I have no idea.
May anybody give me some advises about the upcall mechanism? Or if KVM has this kind of mechanism already?
Thank you very much.
Harry.
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