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Re: [Xen-devel] [PATCH 2/3] remove saving/restoring method in Xend.

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/3] remove saving/restoring method in Xend.
From: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>
Date: Thu, 23 Apr 2009 17:27:52 +0900
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ross Philipson <Ross.Philipson@xxxxxxxxxx>, Kouya Shimura <kouya@xxxxxxxxxxxxxx>
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On Thu, 23 Apr 2009 08:22:49 +0100
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:

> On 23/04/2009 03:57, "Yuji Shimada" <shimada-yxb@xxxxxxxxxxxxxxx> wrote:
> > Of course, it is better to reset in pciback. So Ross's patches seems
> > to be nice. But as the future freeze is announced for Xen 3.4, I think
> > these patches are too big to merge with it. I think it is better to
> > merge these patches after Xen 3.4 is released.
> > 
> > My patches are sufficient enough to make Xen 3.4 robust in resetting/
> > restoring devices.
> Your patch is rather big for 3.4 at this stage. I wasn't going to check it
> in before the branch. Do people want them enough to shove them in? I'm
> certainly not keen.
>  -- Keir

Hi, Keir & Ian

OK, I understand that my patches are also big. But I'm worried about
one problem for Xen 3.4. The problem is that devices are deassigned
before the reset on current Xen. Dom0 memory may be broken by DMA if
the problem is not fixed.
My patches fix the problem. I mean that devices are deassigned after
the reset with my patches.

I can work on making the patch just changing order of resetting/
deassigning devices if you need the fix for Xen 3.4.

Yuji Shimada

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