[PATCH 01/34] AMD IOMMU: add Kconfig entry

[Muli Ben-Yehuda]

On Fri, Jun 27, 2008 at 07:05:46PM +0200, Joerg Roedel wrote:
> On Fri, Jun 27, 2008 at 12:59:47PM -0400, Muli Ben-Yehuda wrote:
> > On Fri, Jun 27, 2008 at 06:54:30PM +0200, Joerg Roedel wrote:
> > 
> > > True. At least for the case without device isolation I have some
> > > optimizations in mind which will minimize the performance
> > > tradeoff. I hope to have them ready for 2.6.28 :)
> > 
> > Do you mean the case where you have a single I/O address space which
> > is shared by all devices?
> 
> Yes. I think this will be the case used most when IOMMU is used for
> virtualization

Could you elaborate on what you mean here? I assume you're thinking
one I/O address space for the host, and one I/O address space per
guest with assigned devices?

> and to handle devices with limited DMA address ranges.

I'd be pretty surprised if you'll find such devices on machines which
will have AMD's IOMMU...

> In this case there is a lot to optimize.

Looking forward to seeing what you have in mind :-)

Cheers,
Muli