Herbert Xu wrote:
quoted text
> On Mon, Aug 11, 2008 at 05:42:21PM -0700, H. Peter Anvin wrote:
>> That's not sufficient, though, because you have to track all the state 
>> and how it relates to everything.  You now have to track both the 
>> userspace FPU state and the potential kernel FPU state.  The VIA 
>> instructions are special (in the short bus to school sense) in that they 
>> use a mechanism intended to protect specific state to protect -- exactly 
>> nothing.
> 
> Sorry, the kernel TS state is what I meant.  I'm definitely not
> advocating the saving of the kernel FPU state.  This is only for
> things like the VIA (which also exists for other processors, see
> the xor SSE stuff in include/asm-x86).

No, there you are actually using the FPU state (which includes the SSE 
state.)

	-hpa
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