linux-kernel - Re: [PATCH 0/2] x86: per-device dma_mapping

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Message-Id: <1210875911.5596.22.camel@alexis>
Date:	Thu, 15 May 2008 11:25:11 -0700
From:	Alexis Bruemmer <alexisb@...ibm.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	andi@...stfloor.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	muli@...ibm.com
Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops

On Thu, 2008-05-15 at 18:16 +0900, FUJITA Tomonori wrote:
> On Thu, 15 May 2008 11:01:09 +0200
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> writes:
> > 
> > > This patchset adds per-device dma_mapping_ops support for
> > > CONFIG_X86_64 like POWER architecture does. This change enables us to
> > > cleanly fix the Calgary IOMMU issue that some devices are not behind
> > > the IOMMU [1]. It also would be helpful to handle KVM PCI passthrough.
> > 
> > This makes it basically impossible to do stack ops, which some 
> > people have been doing.
> 
> Seems that I misunderstand what those people want.
> 
> What those people want to do and how the stack ops achieve it? Or can
> you tell me where their patches are?
Yes an explanation of stack ops, or a pointer to a patch set that
implements them would be very useful.


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