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

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Date:	Tue, 10 Apr 2007 16:20:36 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	Andi Kleen <ak@...e.de>, Ashok Raj <ashok.raj@...el.com>,
	linux-kernel@...r.kernel.org, akpm@...l.org, gregkh@...e.de,
	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 11:09 +0300, Muli Ben-Yehuda wrote:
> On Tue, Apr 10, 2007 at 03:57:28PM +0800, Shaohua Li wrote:
> > 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.
> 
> Apologies but I've not had a chance to review the patches yet. Do you
> special case the BDF of the graphics adpater (via PCI ID?), or does
> the user need to provide a command line option to specify the graphics
> adapter?
Not understand what you ask. The PCI device's type can tell us if it's a
gfx device. 

Thanks,
shaohua
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