On Mon, Jul 06, 2015 at 12:11:01PM +1000, Alexey Kardashevskiy wrote: > Currently TCE tables are created once at start and their size never > changes. We are going to change that by introducing a Dynamic DMA windows > support where DMA configuration may change during the guest execution. > > This changes spapr_tce_new_table() to create an empty stub object. Only > LIOBN is assigned by the time of creation. It still will be called once > at the owner object (VIO or PHB) creation. > > This introduces an "enabled" state for TCE table objects with two > helper functions - spapr_tce_table_enable()/spapr_tce_table_disable(). > spapr_tce_table_enable() receives TCE table parameters and allocates > a guest view of the TCE table (in the user space or KVM). > spapr_tce_table_disable() disposes the table. > > Follow up patches will disable+enable tables on reset (system reset > or DDW reset). > > No visible change in behaviour is expected except the actual table > will be reallocated every reset. We might optimize this later. > > The other way to implement this would be dynamically create/remove > the TCE table QOM objects but this would make migration impossible > as migration expects all QOM objects to exist at the receiver > so we have to have TCE table objects created when migration begins. > > spapr_tce_table_do_enable() is separated from from spapr_tce_table_enable() > as later it will be called at the sPAPRTCETable post-migration stage when > it has all the properties set after the migration. > > Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
--
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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