RE: [Xen-ia64-devel][PATCH]Change to new interrupt deliver mechanism

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Doi.Tsunehisa@xxxxxxxxxxxxxx write on 2006年12月6日 17:20:
> 
>   Sorry, I don't know this issue for detail. I think that the guest
> OS sets interrupt mask register of VIOSAPIC until setting own vector.
> I assume that the guest OS might change the vector for such hardware
> in active state.
> 
Hi Doi,

This issue is from you,  guest linux uses vector, while there is no
function like vector_to_irq.

Because the hardware irq for platform_pci will not be changes.
We can call set_callback_irq with hardware irq inside Qemu,
Thus, platform_pci driver don't need to call set_callback_irq.

Yes, guest OS can change the vector for platform_pci hardware irq,
But the hardware irq is not changed, and HV know how to translate hardware irq 
to level
through VIOSAPIC,
And HV still use viosapic_set_irq to pend platform_pci interrupt.

So I think it works.


--Anthony


>   Thank you.
> 
> - Tsunehisa Doi

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