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    SubjectRe: [PATCH 06/16] xen: disable PAT
    > Roughly speaking the kernel needs to cope with different values written
    > to MSR_IA32_CR_PAT than the single hard coded value it would write
    > itself if given the chance. Essentially _PAGE_CACHE_* need to become
    > dynamic (or I guess we could change the native layout to match Xen's, I
    > don't know why native differs from the initial state, I guess just to
    > avoid using the PAT bit for some reason.

    Because it is required for some processor variants due to errata. This is
    also why the BIOS has them programmed as a mirror between 0-3 and 4-7.

    I don't think changing Linux here is the right thing to do - if anything
    Xen probably needs to change.

    See Xeon errata P21.


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