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

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Message-ID: <87y76cym96.fsf@basil.nowhere.org>
Date:	Thu, 15 May 2008 11:01:09 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	muli@...ibm.com, alexisb@...ibm.com
Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops

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.

-Andi
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