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    SubjectRe: [patch] x86, avx: don't use avx instructions with "noxsave" boot param
    On 07/31/2012 09:27 AM, Suresh Siddha wrote:
    > On Mon, 2012-07-30 at 21:33 -0700, H. Peter Anvin wrote:
    >> I'm wondering if we shouldn't just kill the affected CPUID bits if osxsave is off...
    > Yes, I considered clearing AVX bit (and any future xsave feature bits)
    > as part of the parsing "noxsave" parameter in x86_xsave_setup().
    > But thought checking for osxsave was more explicit and there are not
    > many places using avx code. Also, this follows the SDM guidelines and
    > sets a nice precedent for someone (app's) to follow in future.
    > I am ok either way!

    My main reason for thinking that it would be good to clear the bits is
    that it plays a lot nicer with alternatives and with static_cpu_has().


    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.

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