linux-kernel - Re: [PATCH 3/9] add frontend implementation for the IOMMU API

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Message-ID: <20081201154603.GB12816@amd.com>
Date:	Mon, 1 Dec 2008 16:46:03 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
	weidong.han@...el.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, mingo@...hat.com,
	amit.shah@...hat.com
Subject: Re: [PATCH 3/9] add frontend implementation for the IOMMU API

On Mon, Dec 01, 2008 at 04:33:11PM +0200, Avi Kivity wrote:
> Joerg Roedel wrote:
> > Hmm, is there any hardware IOMMU with which we can't emulate domains by
> > partitioning the IO address space? This concept works for GART and
> > Calgary.
> >
> >   
> 
> Is partitioning secure?  Domain X's user could program its hardware to 
> dma to domain Y's addresses, zapping away Domain Y's user's memory.

No its not secure. But this problem exists with pv-dma without iommu
too.

Joerg

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