[Xen-devel] Re: IO_APIC in para-guest

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Mar 2006, at 13:51, Dong, Eddie wrote:

>     When thinking more about IO_APIC virtualization in Itanium,
>  I got a confuse: How is io_apic.c used in xenlinux (X86)?
>       It looks like all the machine resource of io_apic is handled in
> xen (xen/arch/x86/irq.c), and the PIRQ based on event channel
>  can be handled by pirq_type in linux/arch/xen/kernel/evtchn.c
> pretty well? Then what is the function of file io_apic.c?
You should probably speak to Jun about it. The idea is that Xen does 
boot-time setup but then hands off control to domain0. This is 
necessary for platforms that require fuller ACPI support than we were 
prepared to put in Xen. Consider an interrupt source that needs to be 
routed by the OS by executing AML code.
 -- Keir


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