Re: [Xen-users] vPro (VT-d) support?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> > Patches have been posted on the xen-devel mailing list.  They may have
> > been merged into xen-unstable by now; if not, then I'm sure the Intel
> > folks would be aiming for a merge before Xen 3.2 or so.
>
> And does Xen support AMD's IOMMU? I'm trying to decide on a hardware
> to make some experiments with HVM and DMA transfers, but can't find
> much information on which would be the best hardware onto which to try
> it out. I get some information from presentations and stuff but am not
> sure if they are still current or already outdated.
>
> Thanks for your answer, it has already helped me.

I don't know if AMD have submitted patches yet.  There was an AMD guy working 
on using the GART as a translation-only (not protection) IOMMU to allow 
passthrough to work (albeit without isolation) on existing non-IOMMU 
hardware.  I'm not sure what the status of that is.

Some folks have recently been trying to get PCI passthrough to HVM working 
without any form of translation hardware whatsoever; patches have been 
floated on the list for this.  Basically the idea is to hide the areas of 
memory used by Xen, dom0, etc from an HVM guest by changing the E820 memory 
map to just say "nothing interesting here".  You're still relying on the 
guest's obeying that, since it has DMA access to all memory.  But one day it 
could be handy for passing PCI devices to Windows domains, etc...

Cheers,
Mark

-- 
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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