Re: [Xen-devel] [PATCH] x86/vioapic: clear remote IRR when switching RTE to edge triggered mode

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 21/11/2011 08:30, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

>>>> On 21.11.11 at 09:25, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
>> On 21/11/2011 08:17, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>> 
>>> Xen itself (as much as Linux) relies on this behavior, so it should
>>> also emulate it properly. Not doing so reportedly gets in the way of
>>> kexec inside a HVM guest.
>>> 
>>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>> Tested-by: Olaf Hering <olaf@xxxxxxxxx>
>> 
>> Acked-by: Keir Fraser <keir@xxxxxxx>
> 
> Committed. Could that also be added to the older maintained trees,
> please (once it made it though stage testing)?

Will do. I think we're still having test problems, possibly another
regression from Jean's patch series.

> Thanks, Jan
> 
>>> --- a/xen/arch/x86/hvm/vioapic.c
>>> +++ b/xen/arch/x86/hvm/vioapic.c
>>> @@ -154,8 +154,9 @@ static void vioapic_write_redirent(
>>>      {
>>>          vlapic_adjust_i8259_target(d);
>>>      }
>>> -    else if ( (ent.fields.trig_mode == VIOAPIC_LEVEL_TRIG) &&
>>> -              !ent.fields.mask &&
>>> +    else if ( ent.fields.trig_mode == VIOAPIC_EDGE_TRIG )
>>> +        pent->fields.remote_irr = 0;
>>> +    else if ( !ent.fields.mask &&
>>>                !ent.fields.remote_irr &&
>>>                hvm_irq->gsi_assert_count[idx] )
>>>      {
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-devel
> 
> 
> 



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