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    SubjectRe: [PATCH 3/6] intel_sgx: driver for Intel Secure Guard eXtensions
    On Wed, Apr 27, 2016 at 04:32:23PM -0700, Jethro Beekman wrote:
    > On 27-04-16 05:40, Jarkko Sakkinen wrote:
    > >> The hardware supports calling EEXTEND on only a part of a page, I think the
    > >> driver should also support that.
    > >
    > > Why would you want to do that?
    >
    > You might have segments in a binary that don't start at the beginning of a page
    > or that end before the end of a page. For example:
    >
    > Type Offset VirtAddr PhysAddr
    > FileSiz MemSiz Flags Align
    > LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000
    > 0x000000000001bcac 0x000000000001bcac R E 1000
    > LOAD 0x000000000001c8e8 0x000000000001c8e8 0x000000000001c8e8
    > 0x0000000000000790 0x0000000000000c68 RW 1000
    >
    > There's no need to measure the extra padding (0x1bd00--0x1c7ff and
    > 0x1cb00--0x1cfff) in this case.

    Do you see this as a performance issue or why do you think that this
    would hurt that much?

    > Jethro

    /Jarkko

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