On Saturday 27 September 2008 21:55:33 Zwane Mwaikambo wrote: > On Sat, 27 Sep 2008, Avi Kivity wrote: > > Yang, Sheng wrote: > > > I think we should do a little more than just write msr to update mtrr. > > > > > > Intel SDM 10.11.8 "MTRR consideration in MP Systems" define the > > > procedure to modify MTRR msr in MP. Especially, step 4 enter no-fill > > > cache mode(set CR0.CD bit and clean NW bit), step 12 re-enabled the > > > caching(clear this two bits). > > > > > > We based on these behaviors to detect MTRR update. > > > > Why not simply flush the mmu on an mtrr write? > > > > (though of course I have no objection to doing what the manual says) > > Detecting that condition is fine for operating systems which follow it, > but some don't, including older Linux kernels :( Flushing on MTRR write, > although being overzealous would be the most robust.
OK, this trade off is reasonable, I will update the mtrr patch. Hope we won't got problem in so early stage. :) -- regards Yang, Sheng -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
