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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 14:31:45 +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>, Ian Jackson <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 13:32:17 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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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.
This code is horribly tangled and in severe need of rewriting in C.
~Andrew
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