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

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

>From: Tian, Kevin
>Sent: 2006年11月21日 17:14
>>From: Doi.Tsunehisa@xxxxxxxxxxxxxx
>>Sent: 2006年11月21日 16:59
>>
>>  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
>

Keir mentioned in another thread that he will change qemu to support 
more GSIs (>16) soon, and this will become an issue with your patch 
since you're only looking at isa_irq_to_vector. Is there any common 
approach exported by linux kernel to find vector->GSI mapping in 
driver? If not, maybe an alternative is to provide a callback_irq_type 
which indicates whether the value is a GSI or vector?

Thanks,
Kevin

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel