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xen-devel
RE: [Xen-devel] address mapping between domains
> > With sane DMA-capable hardware the driver domain never
> needs to actually
> > map the page into its address space anyhow. However, the grant table
> > stuff will still be required to enable us to configure the IO MMU
> > appropriately to allow the DMA (we expect to see such h/w
> support become
> > commonplace).
>
> True for some kinds of IO. Network IO needs sorting through
> packets, so no direct DMA will be done.
The headers of network packets are sent out-of-band so that mapping of
the main payload is only required if you have some very fancy iptables
rules that do deep inspection.
I don't believe there's a significant overhead to the protection
provided by grant tables, and they go some way to keeping the security
folks happy.
Anyhow, we can benchmark it in a couple of days...
Ian
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