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    SubjectRe: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support
    Andi Kleen wrote:
    > Jeremy Fitzhardinge <jeremy@goop.org> writes:
    >
    >> This moves __PAGE_OFFSET up by 16 GDT slots, from 0xffff810000000000
    >>
    >
    > GDT? PDP?
    >

    I meant PGD slots. Or PML4 in x86 terms.

    >> to 0xffff880000000000. I have no general justification for this: th
    >>
    >
    > This will significantly decrease the maximum amount of physical
    > memory supported by Linux longer term.
    >

    A bit, but not "significantly". We'd already discussed that if the
    amount of physical starts approaching 2^48 then we'd hope that the chips
    will grow some more virtual bits.

    J


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