linux-kernel - Re: [00/15] swiotlb cleanup

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Message-Id: <20090713185247W.fujita.tomonori@lab.ntt.co.jp>
Date:	Mon, 13 Jul 2009 18:53:21 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	Ian.Campbell@...citrix.com
Cc:	fujita.tomonori@....ntt.co.jp, mingo@...e.hu, jeremy@...p.org,
	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	linuxppc-dev@...abs.org, benh@...nel.crashing.org,
	tony.luck@...el.com, x86@...nel.org, beckyb@...nel.crashing.org,
	joerg.roedel@....com
Subject: Re: [00/15] swiotlb cleanup

On Mon, 13 Jul 2009 10:40:29 +0100
Ian Campbell <Ian.Campbell@...citrix.com> wrote:

> On Mon, 2009-07-13 at 05:20 +0100, FUJITA Tomonori wrote:
> > On Fri, 10 Jul 2009 15:02:00 +0100
> > Ian Campbell <Ian.Campbell@...rix.com> wrote:
> > 
> > > On Fri, 2009-07-10 at 14:35 +0900, FUJITA Tomonori wrote:
> > > > I don't think that we need to take account of dom0 support; we don't
> > > > have a clear idea about an acceptable dom0 design (it needs to use
> > > > swiotlb code? I don't know yet), we don't even know we will have dom0
> > > > support in mainline. That's why I didn't CC this patchset to Xen
> > > > camp.
> > > 
> > > The core domain 0 patches which were the subject of the discussions a
> > > few week back are completely orthogonal to the swiotlb side of things
> > 
> > ? If we don't merge dom0 patch, we don't need dom0 changes to
> > swiotlb. We don't know we would have dom0 support in mainline. Or I
> > overlooked something?
> [...]
> > As far as I know, you have not posted anything about changes to
> > swiotlb for domU. I can't discuss it. If you want, please send
> > patches.
> 
> There are no separate domU swiotlb patches -- the exact the same patches
> as we have already been discussing are useful and necessary for both
> domU and dom0.

Hmm, you guys introduced the swiotlb hooks by saying that it's for
only dom0.

=
http://lkml.org/lkml/2008/12/16/351

Hi Ingo,

Here's some patches to clean up swiotlb to prepare for some Xen dom0
patches.  These have been posted before, but undergone a round of
cleanups to address various comments.

=

I don't see any comments like 'this is useful to dom0 too'. I'm still
not sure what exactly part is useful to domU.
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