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

[Doi.Tsunehisa@xxxxxxxxxxxxxx]

Hi Anthony,

  Thank you for your comment.

You (anthony.xu) said:
>>   Hardware IRQ is equal to GSI, but the IRQ in IPF-linux world is
>> abstruct value not GSI. So we need to get GSI for platform-pci from
>> IPF-linux world's IRQ. But I didn't find it.
>> 
>  * Hypervisor becomes to be able to use both GSI and Vector for callback
>     irq.
>     - For example, if it is normal value, HV accepts it as GSI.
>       If it is value which is set MSB, HV accepts it as Vector.
>   * If hypervisor gets Vector as callback irq, hypervisor finds the GSI
>     for the pseudo device from virtual interrupt controller setting.
> 
> Hi Doi,
> 
> Understand you question now.
> 
> Linux-irq is equal to vector in VIOSAPIC,
> 
> I think linux-irq will not alter after guest linux boot,
> So platform_pci can call set_callback_irq using vector (linux-irq).
> HV will directly pend this vector without looking for VIOSAPIC.

  We had implemented older PV-on-HVM with the method like this.
But, we found the issue that interrupt was injected during interrupt
masking of VIOSAPIC. So we changed to implement it.

  In this time, we have to implement it that interrupt injection follows
VIOSAPIC status. Thus, HV should look for VIOSAPIC, I think.

Thanks,
- Tsunehisa Doi
 

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