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

[Muli Ben-Yehuda <muli@xxxxxxxxxx>]

On Wed, Sep 19, 2007 at 07:24:33AM +0100, Keir Fraser wrote:
> On 18/9/07 21:41, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
> 
> > I was checking for vtd_enabled in common/page_alloc.c.  What is the
> > proper place to define this?   I will defer submission of common changes
> > until we reach an agreement on this.
> 
> Since this initial patchset is about translation (for HVM guests)
> rather than security, you could have a global iommu table for all PV
> guests that 1:1 maps everything. That can be set up at start-of-day
> with no common-code hooks.

Since VT-d has a per BDF translation table, why does enabling
translation for some BDF's require enabling it for everyone else too?

Cheers,
Muli

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