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    SubjectRe: Efficient IPC mechanism on Linux
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    > Pardon my ignorance here, but the impression I get is that changing a
    > page table entry is not as simple as just writing to a bit somewhere. I
    > suppose it is if the page descriptor is not loaded into the TLB, but if
    > it is, then you have to ensure that the TLB entry matches the page
    > table; this may not be a quick operation.
    >
    > I can think of a lot of other possible complications to this.

    I stopped writing about this question a lot of time ago.
    However, here we are.

    If you modify the page tables as in my example (and then if you do so only
    for B's pagetable)
    you can be sure the things you're modifying were not present in Firmware
    TLBs, not yet.

    Because those pagetable entries refer to a logical address interval
    you've just allocated in B address space.

    Bye,
    Luca

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