On 21/11/14 09:43, Ian Campbell wrote: > On Thu, 2014-11-20 at 18:28 +0000, Andrew Cooper wrote: >> Realistically, this means no updates to the >> p2m at all, due to several potential race conditions. > From the rest of the mail it seems as if you are talking primarily about > changes to the p2m *structure*, i.e. which guest frames contain the p2m > pages, rather than changes to the p2m entries themselves. Is that > correct?
I cover both, although the structure changes are the more obvious, and more complicated to fix. There are race conditions in both existing implementation between a p2m/m2p update and the toolstack sampling the dirty bitmap where stale frames don't get resent. > > I don't see any (explicit) mention of the pfn_to_mfn_frame_list_list > here, where does that fit in? > It is referenced several times, although not by its exact name. ~Andrew
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