Xen devel - Nov 2006 - [PATCH] Change spec of callback IRQ for PV-on-HVM on IA64

Hi all,

  We found some issues about interrupt for PV-on-HVM on IA64. One
of them is as follow:

  * IRQ number issue
    - In IA64-Linux, IRQ is abstruct value, not hardware IRQ.
      (IRQ in IA64-Linux is external interrupt vector indeed.)
      * We had implemented PV-on-HVM feature as this semantic.
    - In other OS (like Windows), we can''t get external interrupt
      vector with the driver interface.

  We discussed methods to modify for the issue, thus ...

  * We have to change the spec of callback IRQ.
     - Currently, it is external interrupt vector, but it has to be
       hardware IRQ id.
     - In PV-driver code for IPF-Linux, we can get hardware IRQ with
       isa_irq_to_vector().

  I''ll send patches to modify the issues.

  * pvdrv.patch2
    - Modify to change the spec of callback IRQ in PV-driver side.
    - This patch brakes compatibility with previous version on IA64.

  I tested with our simple test of PV-on-HVM on RHEL4 U2 for IA64
with hypervisor side modification.

Thanks,
- Tsunehisa Doi


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