[Xen-devel] why would XENMEM_decrease_reservation fail?

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

I am attempting to implement the kludge to make save/restore/migrate
work in the GPLPV drivers under Xen 3.4.1. On my test box I successfully
free grant_table_pages + 1 pages. The logs from another users system
show that each call to XENMEM_decrease_reservation returns 0 instead of
1.

Under what circumstances would XENMEM_decrease_reservation fail? The pfn
passed to XENMEM_decrease_reservation looks reasonable (similar values
to my test box), and everything else is identical.

Thanks

James


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