On Mon, Mar 14, 2016 at 05:29:44PM +0000, Peter Maydell wrote: > On 14 March 2016 at 11:13, Andre Przywara <andre.przywara@xxxxxxx> wrote: > > So I see two ways to fix this: > > 1.) we find a KVM specific way of letting userland save and restore the > > ITS tables directly > > 2.) we implement the BASER<n> registers, but still use our "cache" for > > normal operations. On demand we would serialize KVM's virtual ITS data > > structures and put them into the guest's memory, so they could be > > saved/restored from there. > > I feel like we're rehashing a bunch of design choices we talked > through way back in the last-but-one Connect. I don't suppose > anybody wrote down our rationales from back then? Someone (not me) had the task to write it down, I don't recall if that happened or not :) > > (In particular I forget whether we decided the ITS tables were > large enough to need to allow some sort of before-the-VM-stops > migration of the data, which would be relatively doable with > option 2 but painful under option 1.) I think we concluded that it's not so much data that applying dirty bitmaps stuff on there is strictly necessary, but that being able to do this was probably a plus, and not very hard to do. I am quite sure that we dismissed option 1, and were decided on option 2 though. -Christoffer -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
