Question: One way to handle guest operating systems that change their page tables using ordinary (nonprivileged) instructions is to mark the page tables as read only

One way to handle guest operating systems that change their page tables using ordinary (nonprivileged) instructions is to mark the page tables as read only and take a trap when they are modified. How else could the shadow page tables be maintained? Discuss the efficiency of your approach vs. the read-only page tables.

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