i've already posted a similar question some months ago...but nobody gave me an 
answer. So i'm trying again. It's just a yes or no question:in order to 
maintain  consistency between shadow PT and guest PT, we have to write-protect 
the guest PTs(the memory tracing technique). Is it right that,in order to 
protect them, we set the Write Protection bit of CR0 in the guest OS?

                                          
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