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Re: [Xen-devel] Migration memory corruption - PV backends need to quiesce

On 27/06/14 17:51, Andrew Cooper wrote:
> Overall, it would appear that there needs to be a hook for all PV
> drivers to force quiescence.  In particular, a backend must guarantee to
> unmap all active grant maps (so the frames get properly reflected in the
> dirty bitmap), and never process subsequent requests (so no new frames
> appear dirty in the bitmap after the guest has been paused).

I think this would be much too expensive for snapshots and things like
remus.  Waiting for all outstanding I/O could take seconds.


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