Re: [Xen-devel] RFC: [0/2] Remove netloop by lazy copying in netback

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27/3/07 08:59, "Herbert Xu" <herbert@xxxxxxxxxxxxxxxxxxx> wrote:

>>> Also bear in mind the plan to avoid the grant mapping at all in the
>>> direct-to-wire transmit case. This also will rely on a #PF (or some other
>>> fault, potentially) if the guest tries to access that pseudophysical page of
>>> memory. If we can work out a way to make this work on ia64 then the
>>> delayed-copy implementation problems are solved too.
> 
> Even with this we could still keep the large pages by using page
> faults on the host page table rather than the guest page table.

Sure. How would you expose those to the guest? If that can be solved we can
define grant-table unmap to switch the p2m entry into an explicitly invalid
state and we're away.

 -- Keir



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