linux-kernel - RE: [PATCH v2] IA64 Compilation Error Fix for Intel IOMMU Identity Mapping Support

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Date:	Fri, 26 Jun 2009 19:21:28 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>
Cc:	'FUJITA Tomonori' <fujita.tomonori@....ntt.co.jp>,
	"'chrisw@...hat.com'" <chrisw@...hat.com>,
	"'torvalds@...ux-foundation.org'" <torvalds@...ux-foundation.org>,
	"'akpm@...ux-foundation.org'" <akpm@...ux-foundation.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'iommu@...ts.linux-foundation.org'" 
	<iommu@...ts.linux-foundation.org>,
	"'linux-ia64@...r.kernel.org'" <linux-ia64@...r.kernel.org>
Subject: RE: [PATCH v2] IA64 Compilation Error Fix for Intel IOMMU Identity
 Mapping Support

On Thu, 2009-06-25 at 14:56 -0700, Yu, Fenghua wrote:
> 
> >(Fenghua, why are we doing the whole setup per pci dev anyway -- why
> not
> >set up the page tables once and point all devices at the same page
> >tables?)
> >
> 
> That's what the ia64 fix patch does...the first pci device set up the
> page table. Then all following pci devices use that page table by
> setting up the context mapping.

I've sorted that out separately -- it's not necessarily part of this
fix, although it _would_ be nice to have it in 2.6.31, since your
original 1:1 mapping patch is quite slow (and takes quite a lot of
memory) without it.

This time, I _am_ going to let it bake in linux-next for a while first
though.

Until Linus pulls the IA64 build fix from the real iommu-2.6.git tree,
I've put this into git://git.infradead.org/~dwmw2/iommu-pt.git

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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