linux-kernel - Re: [PATCH 1/2] IOMMU Identity Mapping Support: iommu_identity

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Date:	Thu, 18 Jun 2009 21:08:35 +0300
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	"'Linus Torvalds'" <torvalds@...ux-foundation.org>,
	"'Stephen Rothwell'" <sfr@...b.auug.org.au>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'Ingo Molnar'" <mingo@...e.hu>,
	"'Christopher Wright'" <chrisw@...hat.com>,
	"'Allen Kay'" <allen.m.kay@...el.com>,
	"'lkml'" <linux-kernel@...r.kernel.org>,
	"'iommu'" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH 1/2] IOMMU Identity Mapping Support:
	iommu_identity_mapping definition

On Thu, Jun 18, 2009 at 11:05:14AM -0700, Fenghua Yu wrote:

> IOMMU Identity Mapping Support: iommu_identity_mapping definition
> 
> Identity mapping for IOMMU defines a single domain to 1:1 map all
> pci devices to all usable memory.

Why use VT-d at all in this case? Do you have a use-case in mind?

Cheers,
Muli

> This method may lose some of DMA remapping benefits like isolation.

I think you meant s/may/will/.

Cheers,
Muli
-- 
Muli Ben-Yehuda | muli@...ibm.com | +972-4-8281080
Manager, Virtualization and Systems Architecture
Master Inventor, IBM Haifa Research Laboratory
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