Re: Re: KVM MMU: why write-protect for the pages containing PML4/PDPT/PDT (page directory) of the guest?

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I got it ,  thank you for your help.



2013/6/13 Paolo Bonzini <pbonzini@xxxxxxxxxx>

    Il 12/06/2013 23:28, yongcheng.wu@xxxxxxxxxxxxx ha scritto:
    > I have a problem for shadow page table. why is write-protect for the
    > pages containing PML4/PDPT/PDT (page directory) of the guest? In
    > other words, need to synchronize the change of the page directory of
    > the guest?

    Shadow page tables are the combination of both the host and guest page
    tables into a single translation.  So they need to be updated every time
    the host or the guest change the page tables.  Updates for the host page
    tables are tracked with MMU notifiers; updates for the guest page tables
    are tracked with write protection.

    Paolo
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