Re: [Xen-devel] [PATCH v3 3/4] libxc: stop migration in case of p2m list structural changes

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Dec 16, 2015 at 10:24:19AM +0100, Juergen Gross wrote:
> With support of the virtual mapped linear p2m list for migration it is
> now possible to detect structural changes of the p2m list which before
> would either lead to a crashing or otherwise wrong behaving domU.
> 
> A guest supporting the linear p2m list will increment the
> p2m_generation counter located in the shared info page before and after
> each modification of a mapping related to the p2m list. A change of
> that counter can be detected by the tools and reacted upon.
> 
> As such a change should occur only very rarely once the domU is up the
> most simple reaction is to cancel migration in such an event.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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