Re: [Xen-devel] Buggy interaction of live migration and p2m updates

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.11.14 at 19:28, <andrew.cooper3@xxxxxxxxxx> wrote:
> Should the guest change the p2m structure during live migration, the
> toolstack ends up with a stale p2m with a non-p2m frame in the middle,
> resulting in bogus cross-referencing.  Should the guest change an entry
> in the p2m, the p2m frame itself will be resent as it would be marked as
> dirty in the logdirty bitmap, but the target pfn will remain unsent and
> probably stale on the receiving side.

MMU_MACHPHYS_UPDATE processing marks the page being changed
as dirty. Perhaps guest_physmap_{add,remove}_page() (or certain
callers thereof) should do so too?

Jan


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