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

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

>From: Keir Fraser [mailto:keir@xxxxxxxxxxxxx]
>Sent: 2006年11月21日 19:33
>>
>> 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?
>
>We plan to add a callback_vector type to the Xen interface for x86 HVM,
>as
>we will deliver event-channel notifications via an MSI-style poke directly
>into the IRR of the appropriate local APIC. We'll continue to support
>callback_irq type for compatibility.
>
> -- Keir

Thanks for info, and this approach seems to be the one promising. :-)

Thanks,
Kevin

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