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    SubjectRe: [RFC] x86: xsave/xrstor support, ucontext_t extensions
    Roland McGrath wrote:
    >> hmm.. so the kernel needs to export all the cpuid info (that the kernel
    >> enables and supports) to the user through some mechanism then?
    >
    > For a cheap interface, we use AT_HWCAP for this. Unfortunately that only
    > covers the first 32 bits of CPUID info. (For another cheap interface,
    > giving all the CPUID bits in the vDSO would be easy.)
    >
    > For a clunky interface that already exists and is "simple" to use,
    > there is /dev/cpu/0/cpuid now. I wonder if having a device node and
    > opening it too much for applications that consider the vDSO too complex.

    I doubt it.

    -hpa



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