Re: [PATCH] x86/hvm: implement save/restore for posted interrupts

[Andrew Cooper <andrew.cooper3@citrix.com>]

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