Re: [Xen-devel] mapped memory delay?

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

> I would like to do the same thing, right now I have shared mem between
> domU and dom0, but no good syncronization. Is there an example somewhere
> of how to do this in the new xcs world? It should be easier now that
> this code has been separated out, right?

If you're sharing memory directly between the two then you don't need to 
involve xcs (other than in the setup phase) since that just does control 
messages.

You might find the ring macros in xen/include/public/ring.h useful.  They make 
it easy to declare ring datatypes (with appropriately sized rings) and 
maintain producer / consumer indexes, with the appropriate memory barriers.

Examples of use are in linux-2.6.10-xen-sparse/drivers/xen/{blk,usb}
{back,front}.  (the net drivers use a slightly different ring format 
instead).

Cheers,
Mark


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