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    SubjectRe: [PATCH 1/3] Add prctl commands PR_GET_TSC and PR_SET_TSC
    Andi Kleen wrote:
    >> I think what Erik is trying to do is to make it possible to disable as
    >> many of these in the kernel as possible; I/O is easy, it's off by
    >> default; RDTSC and RDPMC can be disabled in the kernel, and I think
    >> even XSTORE can be disabled.
    >
    > I'm a little sceptical it will work reliably, but we'll see.
    >
    > There's also LSL (forgot that earlier). It is used by the vgetcpu()
    > because it's faster than CPUID or RDTSCP. Kernel
    > sets a magic segment up which has different limits for different CPUs.
    >

    Yeah, that's unlikely to be found in code that isn't actively looking
    for it, though.

    -hpa


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