Hi Tim,

Thanks a lot!

Now, I know that fixup_page_fault() -> ptwr_do_page_fault handles the write attempts to a pagetable page.

But
1) how does the guest OS tell xen which page is a pagetable page? What if the guest doesn't do so? I assume xen should check if a pagetable had already been registered or not. But in do_mmuext_op(), there is no such check before setting the cr3.

2) in ptwr_do_page_fault(), it should disconnect the page from page directory and then mark the page as writable. Where are they done? In x86_emulate()?

Thanks in advance!
Weiming

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