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

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2/3] remove saving/restoring method in Xend.
From: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>
Date: Fri, 24 Apr 2009 17:38:24 +0900
Cc: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kouya Shimura <kouya@xxxxxxxxxxxxxx>, Ross Philipson <Ross.Philipson@xxxxxxxxxx>
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On Thu, 23 Apr 2009 10:01:02 +0100
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:

> On 23/04/2009 09:27, "Yuji Shimada" <shimada-yxb@xxxxxxxxxxxxxxx> wrote:
> > 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.
> If we stick with the existing pciback mechanisms and interfaces for 3.4
> (which is preferable at this point) will we simply break 3.4 branch as soon
> as the new pciback patches go into linux-2.6.18-xen when 3.5 opens? Or is
> there a story on backward compatibility between different pciback/xend
> versions?

Hi, Keir

I don't have any idea for backward compatibility between different
pciback/xend versions.
I give up being applied to linux-2.6.18-xen.

I will sent the patch to change the order of resetting/deassigning
device for Xen 3.4.

Yuji Shimada

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