On Fri, 2013-09-20 at 13:04 -0500, Bhushan Bharat-R65777 wrote: > > > -----Original Message----- > > From: Wood Scott-B07421 > > Sent: Friday, September 20, 2013 9:48 PM > > To: Bhushan Bharat-R65777 > > Cc: Wood Scott-B07421; benh@xxxxxxxxxxxxxxxxxxx; agraf@xxxxxxx; > > paulus@xxxxxxxxx; kvm@xxxxxxxxxxxxxxx; kvm-ppc@xxxxxxxxxxxxxxx; linuxppc- > > dev@xxxxxxxxxxxxxxxx > > Subject: Re: [PATCH 5/6 v5] kvm: booke: clear host tlb reference flag on guest > > tlb invalidation > > > > On Thu, 2013-09-19 at 23:19 -0500, Bhushan Bharat-R65777 wrote: > > > We uses these bit flags only for TLB1 and if size of stlbe is 4K then > > > we set E500_TLB_TLB0 otherwise we set E500_TLB_BITMAP. Although I > > > think that E500_TLB_BITMAP should be set only if stlbe size is less > > > than gtlbe size. > > > > Why? Even if there's only one bit set in the map, we need it to keep track of > > which entry was used. > > If there is one entry then will not this be simple/faster to not lookup bitmap and guest->host array? > A flag indicate it is 1:1 map and this is physical address. The difference would be negligible, and you'd have added overhead (both runtime and complexity) of making this a special case. -Scott -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
