[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] Change spec of callback IRQ forPV-on-HVMonIA64
On 21/11/06 10:56, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote: >> 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? 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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