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SubjectRe: i387/FPU init issues...
Ingo Molnar wrote:
> * H. Peter Anvin <hpa@zytor.com> wrote:
>
>>> This might also be caused by a calibration error. We've seen enough
>>> of them already.
>> No doubt. However, there is *something* ugly going on.
>
> i think a vital clue can be found in the original report:
>
> | I am able to reproduce the issue consistently on my laptop using qemu
> | (which helped speed debugging a bit). I have also narrowed it down to
> | include/asm-x86/i387.h::__save_init_fpu in (32 bit version) - it dies
> | somewhere in calling the following line:
>
> so it might just be incorrect Qemu emulation of a PII's NOP instruction?
>
> (which btw. probably proves that Linux is the first OS to make
> intelligent use of those instructions?)
>

Ah, yes, this is a Qemu bug, then.

And yes, it probably does mean exactly that :)

-hpa


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