Re: FP in kernelspace

[Avi Kivity]

Jan Engelhardt wrote:
> > kernel_fpu_begin();
> > c = d * 3.14;
> > kernel_fpu_end();
>
> static inline void kernel_fpu_begin() {
>     ...
>     preempt_disable();
>     ...
> }
Is the kernel allowed to clobber userspace's sse registers?

What about interrupt code?

xor.h at least appears to save the sse state before use.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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