[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH RFC v2 1/4] x86/mm: Shadow and p2m changes for PV mem_access
>>> On 04.09.14 at 10:39, <tim@xxxxxxx> wrote: >> Tim, can you think of any other options here? > > It might be possible to make the walk restartable if we arrange that: > - all additions to the page list are at the tail; > - walks in progress are recorded (though I'm not sure where: it might > be possible just to use a single bit in the page_info to say "this > page is the cursor of an interrupted walk" and have a separate > per-domain list of interrupted walks); and > - anything that removes a page from a domain's page_list must check > that bit; if it finds it set it must update the per-walk state to > point to the next page. > > Jan, do you think that's viable? I think it'll need a bit of thought > around the edge cases, and the semantics will need to be written down > carefully. Yes, nice idea - I think that could work (with particularly converting arch_iommu_populate_page_table() to use that mechanism, while inspecting [and perhaps adjusting] the related code in p2m_pod_offline_or_broken_hit()) and would not end up being too ugly (i.e. not exactly nice, but maintainable). Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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