linux-kernel - Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

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Message-ID: <20080627171201.GC26130@il.ibm.com>
Date:	Fri, 27 Jun 2008 13:12:01 -0400
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Adrian Bunk <bunk@...nel.org>,
	Joerg Roedel <joerg.roedel@....com>, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	Sebastian.Biemueller@....com, robert.richter@....com
Subject: Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

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


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