From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH] x86/hvm: implement save/restore for posted
 interrupts
Date: Fri, 19 Sep 2014 18:51:41 +0100
Message-ID: <541C6D2D.3090607@citrix.com>
References: <A9667DDFB95DB7438FA9D7D576C3D87E0AB31DF7@SHSMSX104.ccr.corp.intel.com>	<AADFC41AFE54684AB9EE6CBC0274A5D125FF31EB@SHSMSX101.ccr.corp.intel.com>	<20140728065232.GA6519@aepfle.de>	<A9667DDFB95DB7438FA9D7D576C3D87E0AB3C3F9@SHSMSX104.ccr.corp.intel.com>	<20140802105956.GA16174@aepfle.de>	<A9667DDFB95DB7438FA9D7D576C3D87E0AB4E9C0@SHSMSX104.ccr.corp.intel.com>	<20140804075007.GA11609@aepfle.de>	<A9667DDFB95DB7438FA9D7D576C3D87E0AB4EE79@SHSMSX104.ccr.corp.intel.com>	<20140805103224.GA15563@aepfle.de>	<A9667DDFB95DB7438FA9D7D576C3D87E0AB9439F@SHSMSX104.ccr.corp.intel.com>	<20140919133227.GA2611@aepfle.de>
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To: Jan Beulich <JBeulich@suse.com>, Olaf Hering <olaf@aepfle.de>, Yang Z Zhang <yang.z.zhang@intel.com>
Cc: Eddie Dong <eddie.dong@intel.com>, Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, Jun Nakajima <jun.nakajima@intel.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

On 19/09/2014 14:39, Jan Beulich wrote:
>>>> On 19.09.14 at 15:32, <olaf@aepfle.de> wrote:
>> On Thu, Sep 18, Zhang, Yang Z wrote:
>>
>>> Zhang, Yang Z wrote on 2014-09-01:
>>>> Zhang, Yang Z wrote on 2014-08-08:
>>>>> Can you tell how you reproduce it? I am following the steps you told
>>>>> me previously, but I cannot reproduce it with this fixing.
>>>> Any update on this?
>>> Ping again.
>> I will have a look at this issue next week.
> Btw., Andrew Cooper hinted at the possibility of this series
>
> http://lists.xenproject.org/archives/html/xen-devel/2014-09/msg02753.html
>
> (particularly patch 2) having an effect on migration problems
> between APICV-capable and -incapable systems, i.e. perhaps
> worth a try in this context too.
>
> Jan

The issue XenServer observes is that problems occur even when migrating 
between two identical machines, one with APICV enabled, and one disabled.

Given the now-discovered issues with Xen's x2apic handling, it is 
entirely possible that the differences between the emulated and real 
APICs was enough to cause issues.   And yet, it could be a mixture of 
all of the issues identified so far.

~Andrew