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Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate fails, domU BUG

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate fails, domU BUG
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Mon, 23 Nov 2009 16:44:36 +0000
Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
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On Tue, 2009-11-10 at 10:08 +0000, Pasi Kärkkäinen wrote:
> Hello,
> Jeremy: Here's summary about these save/restore problems
> using upstream Linux PV guest.
> For me:
>       - I can "xm save" + "xm restore" UP guest, but I get non-fatal
>         BUG in the guest kernel, see [1].
>       - "xm save" fails for SMP guest with "failed to get the suspend evtchn 
> port", see [2].
> For Dan:
>       - "xm save" works for UP guest, but "xm restore" doesn't, giving
>         infinite xen_sched_clock related dumps in the guest kernel, see [3].

The runstate fix I sent to the list last week should help with this one.

>       - "xm save" for SMP guest fails, it never ends. I suspect this
>         is the same problem I'm seeing.

I'm seeing this (or something very like it) too. At the moment it looks
as if drivers/xen/manage.c:do_suspend is getting as far as the
stop_machine() call but I am never seeing to the xen_suspend() callback.


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