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

[Doi.Tsunehisa@xxxxxxxxxxxxxx]

Hi Anthony,

You (anthony.xu) said:
>>   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.

  Sorry, I might misunderstand your comment.

  Yes, I think so.

> 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.

  Do you meen that we have to modify qemu code to solve this isssue ?

Thanks,
- Tsunehisa Doi

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