Re: [PATCH v7 2/4] virtio_balloon: introduce migration primitives toballoon pages

[Michael S. Tsirkin]

On Tue, Aug 14, 2012 at 05:11:13PM -0300, Rafael Aquini wrote:
> On Tue, Aug 14, 2012 at 10:51:39PM +0300, Michael S. Tsirkin wrote:
> > What I think you should do is use rcu for access.
> > And here sync rcu before freeing.
> > Maybe an overkill but at least a documented synchronization
> > primitive, and it is very light weight.
> > 
> 
> I liked your suggestion on barriers, as well.
> 
> Rik, Mel ?

Further instead of simple assignment I would add an api
in mm to set/clear the balloon mapping, with proper locking.

This could fail if already set, and thus fix crash with
many ballons.
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