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

[Doi.Tsunehisa@xxxxxxxxxxxxxx]

Hi,

I (Doi.Tsunehisa) said:
>   Hmm.. Current implement needs the GSI for platform-pci to follow
> status of virtual IOSAPIC in hypervisor side. But, it's not certain
> value from virtual IOSAPIC at calling set_callback_irq hypercall.
> 
>   I'll be thinking more...

  I've investigated it, but I couldn't find the method to get GSI of
platform-pci for PV-on-HVM driver. There is convert functions like
isa_irq_to_vector() in linux kernel source.

    [arch/ia64/kernel/apci.c]
    int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)

    [arch/ia64/kernel/iosapic.c]
    inline int gsi_to_vector (unsigned int gsi)

  But, these functions are not EXPORT_SYMBOLE, thus we can't use them for
kernel module.

  So, I think that..

  * 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.

  What do you think about this method ?

Thanks,
- Tsunehisa Doi

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