From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@suse.com>
Subject: Re: Please revert / review
 077fc1c04d70ef1748ac2daa6622b3320a1a004c
Date: Fri, 20 Jun 2014 09:22:51 +0100
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To: Matthias <matthias.kannenberg@googlemail.com>
Cc: Yang Z Zhang <yang.z.zhang@intel.com>, "tim@xen.org" <tim@xen.org>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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>>> On 19.06.14 at 18:22, <matthias.kannenberg@googlemail.com> wrote:
> Test 2:
> 
> Xen-Version: Compiled a normal 077 commit version without any of your
> patches
> Xen cmd line: added immo=no-sharept as suggested
> Passed-through devices: vga, 2 usb controller (ohci+ehci), sound card
> Result: works fine. domU boots, no BSOD, no other problems, server seems to
> be stable. So not sharing the VT-d page tables seems to do the trick / the
> problem is in the page table sharing.

Just to clarify - page table sharing is intended to get disabled in
-unstable on the AMD side (
http://lists.xenproject.org/archives/html/xen-devel/2014-06/msg00416.html,
still awaiting an AMD IOMMU maintainer ack). But as that's not
immediately a backporting candidate, understanding the problem
to find a solution also for 4.4.x would still be necessary.

Jan