Messages in this thread | | | Date | Fri, 19 Apr 2002 14:00:31 -0400 | From | Doug Ledford <> | Subject | Re: SSE related security hole |
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On Fri, Apr 19, 2002 at 04:06:17PM +0200, Andi Kleen wrote: > "H. Peter Anvin" <hpa@zytor.com> writes: > > > > Perhaps the right thing to do is to have a description in data of the > > desired initialization state and just F[NX]RSTOR it? > > Sounds like the cleanest solution. The state could be saved at CPU bootup > with just MXCSR initialized. > > I'll implement that for x86-64.
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.
-- Doug Ledford <dledford@redhat.com> 919-754-3700 x44233 Red Hat, Inc. 1801 Varsity Dr. Raleigh, NC 27606
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