Re: [Xen-devel] Please revert / review 077fc1c04d70ef1748ac2daa6622b3320a1a004c

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Jan Beulich wrote on 2014-06-20:
>>>> On 19.06.14 at 18:22, <matthias.kannenberg@xxxxxxxxxxxxxx> 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.h
> tml, 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.

Agree. I will work on it. 

> 
> Jan


Best regards,
Yang



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