linux-kernel - Re: [PATCH 3/4] Bug Fix drivers/pci/intel-iommu.c: convert paddr to correct DMA pfn

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Date:	Wed, 05 Aug 2009 08:23:09 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	Tony Luck <tony.luck@...el.com>, iommu@...ts.linux-foundation.org,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Bug Fix drivers/pci/intel-iommu.c: convert paddr
 to correct DMA pfn

On Tue, 2009-08-04 at 15:10 -0700, Fenghua Yu wrote:
> When calling domain_pfn_mapping(), paddr should be converted to DMA pfn
> correctly instead just shift by VTD_PAGE_SHIFT.
> 
> This issue causes kernel panic on PAGE_SIZE>VTD_PAGE_SIZE platforms e.g. ia64
> platforms.
> 
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>

Using the word 'alignment' somewhere in the above commit would have
confused me a lot less -- I got most of the way through composing a mail
asking how this patch wasn't a no-op, before I spotted it.

An alternative would be to align the size to DMA pages? Would that make
the sg case easier? 

(Thanks for fixing this, btw)

-- 
dwmw2

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