Re: SSE related security hole
H. Peter Anvin (firstname.lastname@example.org)
Fri, 19 Apr 2002 14:35:57 -0700 (PDT)
>> Ummm...last I knew, fxrstor is *expensive*. The fninit/xor regs setup
>> is likely *very* much faster. Someone should check this before we
>> sacrifice 100 cycles needlessly or something.
> most probably yes, fxrestor needs to read ram, pxor also takes some
> icache and bytecode ram but it sounds like it will be faster.
> Maybe we could also interleave the pxor with the xorps, since they uses
> different parts of the cpu, Honza?
You almost certainly should. The reason I suggested FXRSTOR is that it
would initialize the entire FPU, including any state that future
processors may add, thus reducing the likelihood of any funnies in the
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to email@example.com
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/