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    SubjectRe: [PATCH v5 6/9] KVM: MMU: introduce pte_prefetch_topup_memory_cache()


    Avi Kivity wrote:
    > On 07/13/2010 08:48 AM, Xiao Guangrong wrote:
    >>
    >>> Right. We should fix those too.
    >>>
    >>> Prefetch is much more worrying though, especially with ept. If a guest
    >>> is using just 1/8 of the pages, it can look to migration as if it's
    >>> using 100% of the pages. The impact can be pretty large.
    >>>
    >> We disabled prefetch if ept is enabled since it can break access bit
    >> tracking.
    >>
    >
    > Oh yes.
    >
    >> I'll fix the dirty bit tracking before post the new version of this
    >> patchset.
    >>
    >
    > Should be simple - disable prefetch for slots that have dirty tracking
    > enabled.

    Agree.

    >
    > What about the Linux accessed and dirty bits? Need to instantiate the
    > speculative sptes with accessed and dirty bits clear (and later examine
    > them when we release the page).
    >

    I see, will do :-)


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