Re: [Xen-users] Xen support for AMD's IOMMU

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> > What is the status of support for AMD's (hardware/Pacifica)
> > IOMMU in xen
> > 3.0.2/3/4?
>
> Considering that we haven't yet got a part available with IOMMU, the
> software to fullfill that function is pretty much a moot point, right?

There's some sort of memory permissions table for PCI devices though, isn't 
there?  I vaguely remember it being in the arch manual, but I haven't 
actually known any software use it (at least in the context of Xen!)

Cheers,
Mark

> As to a direct answer to the question: There is no AMD IOMMU software in
> 3.0.{2,3,4}. There's been a patch supplied by Mark Langsdorf to use the
> GART in the current AMD64 architecture for IOMMU operations (same way as
> the Linux kernel itself uses this portion of the chip). This is NOT to
> be confused with the REAL IOMMU design.
>
> --
> Mats
>
> > Thanks
> > Daniel
> >
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-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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