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

To: <Doi.Tsunehisa@xxxxxxxxxxxxxx>
Subject: RE: [Xen-ia64-devel][PATCH]Change to new interrupt deliver mechanism
From: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Date: Wed, 6 Dec 2006 10:18:22 +0800
Cc: xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-ia64-devel][PATCH]Change to new interrupt deliver mechanism
Doi.Tsunehisa@xxxxxxxxxxxxxx write on 2006年12月5日 19:59:
>   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
    - 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.


> - Tsunehisa Doi

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