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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 19/09/2014 14:39, Jan Beulich wrote:
> > > > On 19.09.14 at 15:32, <olaf@xxxxxxxxx> 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

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