RE: [Xen-devel] [PATCH] Change spec of callback IRQ for PV-on-HVMonIA64

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Doi.Tsunehisa@xxxxxxxxxxxxxx
>Sent: 2006年11月21日 16:59
>
>Hi Kevin,
>
>You (kevin.tian) said:
>>>  I think that the other OS register evtchn_interrupt at own vector
>>>determined by itself for GSI(0x9).
>>>
>>
>> OK, I see your point. One interesting question is, since you don't
>> know what the own vector used by other OS is, how do you do
>> translation within xen to inject at own vector wanted by other OS?
>> If there's a way to tell, why not tell at set_callback_irq time? :-)
>
>  In my experience, the other OS has device driver interface to notice
>GSI for the device. It tells the vector to the interrupt controller
>in kenrel code, not device driver. So, we can't know the vector, I think.
>

OK, I now understand. Other OS tells xen GSI number as callback_irq, 
and then xen look up virtual interrupt controller to find appropriate 
vector by GSI number. This is the way to go. :-)

Thanks a lot,
Kevin

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