Re: [Xen-devel] High CPU temp, suspend problem - xen 4.1.5-pre, linux 3.7.x

[Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On 28.03.2013 17:25, Jan Beulich wrote:
>>>> On 27.03.13 at 15:31, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:
>> On 27.03.2013 09:52, Jan Beulich wrote:
>>>>>> On 26.03.13 at 19:50, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>>>> So vector e9 doesn't appear to be programmed in anywhere.
>>>
>>> Quite obviously, as it's the 8259A vector for IRQ 9. The question
>>> really is why an IRQ appears on that vector in the first place. The
>>> 8259A resume code _should_ leave all IRQs masked on a fully
>>> IO-APIC system (see my question raised yesterday).
>>>
>>> And that's also why I suggested, for an experiment, to fiddle with
>>> the loop exit condition to exclude legacy vectors (which wouldn't
>>> be a final solution, but would at least tell us whether the direction
>>> is the right one). In the end, besides understanding why an
>>> interrupt on vector E9 gets raised at all, we may also need to
>>> tweak the IRQ migration logic to not do anything on legacy IRQs,
>>> but that would need to happen earlier than in
>>> smp_irq_move_cleanup_interrupt(). Considering that 4.3
>>> apparently doesn't have this problem, we may need to go hunt for
>>> a change that isn't directly connected to this, yet deals with the
>>> problem as a side effect (at least I don't recall any particular fix
>>> since 4.2). One aspect here is the double mapping of legacy IRQs
>>> (once to their IO-APIC vector, and once to their legacy vector,
>>> i.e. vector_irq[] having two entries pointing to the same IRQ).
>>
>> So tried change loop condition to LAST_DYNAMIC_VECTOR and it doesn't hit 
>> that
>> BUG/ASSERT. But still it doesn't work - only CPU0 used by scheduler, also 
>> some
>> errors from dom0 kernel, and errors about PCI devices used by domU(1).
>>
>> Messages from resume (different tries):
>> http://duch.mimuw.edu.pl/~marmarek/qubes/xen-4.1-last-dynamic-vector.log 
>> http://duch.mimuw.edu.pl/~marmarek/qubes/xen-4.1-last-dynamic-vector2.log 
> 
> Is that a sensible usage scenario at all? I would think that a
> prerequisite to host S3 is that all guests get suspended. 

What do you mean by "suspended"? I haven't found any sane method to do that
with xl (only some manual xenstore write to control/shutdown). For now I do:
 - shutdown all network adapters in VMs
 - pause all VMs

> If you
> do that, do you still have these interrupt re-setup problems?

Yes, even when no guest is running (which was the case on 4.2)...

-- 
Best Regards / Pozdrawiam,
Marek Marczykowski
Invisible Things Lab

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