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    SubjectRe: [PATCH] linux-2.5.43_vsyscall_A0
    Hi!

    > > > Since no one really brought up any issues with the code itself
    > > > (correct me if I'm wrong), here is the i386 vsyscall gettimeofday port
    > > > I sent last night, synced up and ready for integration.
    > >
    > > This vsyscall implementation breaks UML. Any app that's run inside UML
    > > that uses vsyscalls will get the host's vsyscalls rather than the UML
    > > vsyscalls.
    >
    > Ugh.
    >
    > Guess you'll have some problems then with UML on x86-64, which always uses
    > vgettimeofday. But it's only used for gettimeofday() currently, perhaps it's
    > not that bad when the UML child runs with the host's time.

    Well, if you want to use UML for time shifting (pretty common use,
    AFAICS)...

    > I guess it would be possible to add some support for UML
    > to map own code over the vsyscall reserved locations. UML would need
    > to use the syscalls then. But it'll be likely ugly.

    I guess this is the right solution. [Or UML could simply unmap that
    area and handle the faults...].
    Pavel
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