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; b...@kernel.crashing.org; ag...@suse.de; > > pau...@samba.org; k...@vger.kernel.org; kvm-...@vger.kernel.org; linuxppc- > > d...@lists.ozlabs.org > > 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 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
