linux-kernel - Re: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization Technology for Directed I/O

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Message-Id: <1176191848.6781.3.camel@sli10-conroe.sh.intel.com>
Date:	Tue, 10 Apr 2007 15:57:28 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Ashok Raj <ashok.raj@...el.com>, linux-kernel@...r.kernel.org,
	akpm@...l.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	anil.s.keshavamurthy@...el.com, arjan@...ux.intel.com
Subject: Re: [patch 0/8] [Intel IOMMU] Support for Intel Virtualization
	Technology for Directed I/O

On Tue, 2007-04-10 at 09:49 +0200, Andi Kleen wrote:
> On Monday 09 April 2007 23:55:52 Ashok Raj wrote:
> 
> > Please help review and provide feedback.
> 
> High level question: how did you solve the "user X server needs IOMMU bypass"
> problem?
Please see patch 5. We have two workarounds for graphics. One is
completely bypass dma remapping for gfx, this option only works for gfx
card with dedicated dma remapping engine. The other is doing 1-1 mapping
for whole physical memory address, then virtual dma address will equal
to physical address, so gfx can ignore iommu in the case.

Thanks,
Shaohua
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