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    SubjectRe: [RFC 0/3] Basic support for LWP
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    On Thu, Oct 7, 2010 at 3:59 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    > On 10/07/2010 03:46 AM, Stephane Eranian wrote:
    >>
    >> As for the patch itself, I am not an expert at xsave/xrstor, but it seems to
    >> me you could decouple LWP from FPU. I think  Brian had the same comment.
    >> I suspect this can be done and it will certainly look cleaner.
    >>
    >
    > Well, once you're using XSAVE you're not decoupled from the FPU.  Worse,
    > if you're using XSAVE and not honoring CR0.TS you have a major design flaw.
    >
    Is that to say, that if you use LWP you will have to save/restore FPU state even
    though you're not actually using it?

    > Nothing that can't be dealt with, but still...
    >
    > --
    > H. Peter Anvin, Intel Open Source Technology Center
    > I work for Intel.  I don't speak on their behalf.
    >
    >
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