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    SubjectRe: MSR driver
    Hi!

    > > Why was it criticized? IMHO it's the best solution because it gives
    > > all the flexibility of unix permissions for the access control.
    > > AFAIK OpenBSD does it the same way.
    > >
    >
    > Only if you take SMP into account (this applies to all methods.) It's
    > no good if on an SMP machine you effectively end up setting MSR's on
    > any random processor, which may change without notice.
    >
    > We may want to have a "cpu X only" system call (schedule only on a
    > specific processor) for things that use per-processor features, such
    > as RDTSC.)

    What about /dev/msr0, /dev/msr1, /dev/msr2 etc, devices? One for each
    CPU. Aha - it might be pretty hard to read msr's from CPU0 while
    running at CPU3... Maybe solvable?

    Pavel

    --
    I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel
    Look at http://atrey.karlin.mff.cuni.cz/~pavel/ ;-).

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