On Fri, Aug 22, 2014 at 10:24:10AM +1000, Samuel Mendoza-Jonas wrote: > If a guest reboots during a running migration, changes to the > hash page table are not necessarily updated on the destination. > Opening a new file descriptor to the HTAB forces the migration > handler to resend the entire table.
Of course, arguably this is a kernel bug - the htab fd should probably
start re-reporting things if the htab reset ioctl() is called. But I
guess we need a workaround for existing kernels anyway.
However, don't we still have the bug for TCG mode? spapr_reset_htab()
just memset()s the whole hashtable in that case, which will actually
clear all the dirty bits, whereas we need to set them.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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