Re: [Xen-devel] simple question on frontend network driver and decreasing reservation

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

That all sounds right.
Giving up the pages from the guest decreases the number of pages the domain 
actually owns, you should see the page count for that domain varies.

The backend assigns pages back to the domain as and when data arrives to fill 
them and notifies the domain via the shared memory interface.  The domain is 
then able to map them into its address space.

The page count of the guest will go up immediately the backend reassigns their 
ownership, regardless of whether the guest remaps them.  When the guest maps 
them, their ref count gets incremented.

By the way, on an unrelated note, how are you planning on tackling the GUI in 
Plan 9?  Or are you mainly aiming at backend servers?  I'd like to be able to 
run Plan 9 but I'm not sure I can dedicate a machine to it (mainly because I 
doubt it would like my hardware).

Cheers,
Mark



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