Re: [Xen-devel] [VTD-NEO][patch 5/6] Intel VT-d/Neocleus 1:1 mregedcode for PCI passthrough

[Muli Ben-Yehuda <muli@xxxxxxxxxx>]

On Tue, Sep 18, 2007 at 11:32:25PM -0700, Kay, Allen M wrote:

> Translation enabling is on per vt-d engine granularity - not BDF
> granularity.  Each BDF context entry can point to a different page
> table structure.
> 
> Setup a single 1:1 mapping structure to be used by all PV domains is
> a good idea.  I will give it a try tomorrow.

I see, thanks for clarifying. That seems pretty strange... do you have
a notion of the overhead incured by the 1-1 mapping and the average
IOTLB hit/miss rates?

Cheers,
Muli

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