postcopy: Add extra check for COPY function
As an extra sanity check, make sure the region we're registering can perform UFFDIO_COPY; the COPY will fail later but this gives a cleaner failure. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-17-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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