linux-kernel - Re: [PATCH 0/9][RFC] stackable dma

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Message-Id: <20080928232129J.fujita.tomonori@lab.ntt.co.jp>
Date:	Sun, 28 Sep 2008 23:21:26 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
	muli@...ibm.com, amit.shah@...ranet.com, mingo@...hat.com,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH 0/9][RFC] stackable dma_ops for x86

On Mon, 22 Sep 2008 20:21:12 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> Hi,
> 
> this patch series implements stackable dma_ops on x86. This is useful to
> be able to fall back to a different dma_ops implementation if one can
> not handle a particular device (as necessary for example with
> paravirtualized device passthrough or if a hardware IOMMU only handles a
> subset of available devices).

We already handle the latter. This patchset is more flexible but
seems to incur more overheads.

This feature will be used for only paravirtualized device passthrough?
If so, I feel that there is more simpler (and specific) solutions for
it.
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