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Re: [Xen-devel] [PATCH 2/2] xen: merge temporary vcpu pinning scenarios
- To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 23 Jul 2019 15:29:10 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, TimDeegan <tim@xxxxxxx>, IanJackson <ian.jackson@xxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 23 Jul 2019 14:29:22 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 23/07/2019 15:14, Juergen Gross wrote:
> On 23.07.19 15:31, Andrew Cooper wrote:
>> On 23/07/2019 14:25, Juergen Gross wrote:
>>> On 23.07.19 14:26, Andrew Cooper wrote:
>>>> On 23/07/2019 10:20, Juergen Gross wrote:
>>>>
>>>>> }
>>>>> /*
>>>>> diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
>>>>> index b40c8fd138..721c429454 100644
>>>>> --- a/xen/include/xen/sched.h
>>>>> +++ b/xen/include/xen/sched.h
>>>>> @@ -200,7 +200,10 @@ struct vcpu
>>>>> /* VCPU is paused following shutdown request
>>>>> (d->is_shutting_down)? */
>>>>> bool paused_for_shutdown;
>>>>> /* VCPU need affinity restored */
>>>>> - bool affinity_broken;
>>>>> + uint8_t affinity_broken;
>>>>> +#define VCPU_AFFINITY_OVERRIDE 0x01
>>>>> +#define VCPU_AFFINITY_NMI 0x02
>>>>
>>>> VCPU_AFFINITY_NMI_MCE ? It is used for more than just NMIs.
>>>
>>> Okay.
>>>
>>> BTW: The MCE case is never triggered (there is no caller of
>>> pv_raise_interrupt() with TRAP_machine_check). Is this code left in
>>> place on purpose or could it be removed?
>>
>> It come from the restore_all_guest path in assembly, via process_mce.
>
> Are you sure? I can see that it would call
> set_guest_machinecheck_trapbounce(), but I don't see how NMI_MCE_SOFTIRQ
> would be triggered on this path, which would be required for hitting
> nmi_mce_softirq().
Looking at it, I'm not so sure...
There is certainly room for further clean-up here, for anyone with
enough time to disentangle this rats nest.
~Andrew
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