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RE: [Xen-devel] [PATCH] Change PCI IRQ assignments

  • To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
  • From: "Dugger, Donald D" <donald.d.dugger@xxxxxxxxx>
  • Date: Wed, 7 Jun 2006 06:26:32 -0700
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 07 Jun 2006 06:26:59 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcaKNOeV5LBgf9IhTZiGzotFiUh4PgAAQbFw
  • Thread-topic: [Xen-devel] [PATCH] Change PCI IRQ assignments


Called it in one, their BIOS has tables that match the PCI settings.

Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
Ph: (303)440-1368 

>-----Original Message-----
>From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx] 
>Sent: Wednesday, June 07, 2006 7:19 AM
>To: Dugger, Donald D
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-devel] [PATCH] Change PCI IRQ assignments
>On 6 Jun 2006, at 22:27, Donald D. Dugger wrote:
>> Currently, the ACPI tables provided for an HVM Xen guest do 
>not include
>> tables for PCI devices.  This causes the guest OS to default 
>to IRQ 9 
>> for
>> all PCI devices.  The PCI code assigns half the PCI IRQs to 
>9 and the 
>> other
>> half to 11, creating the possibility of confusing certain 
>unamed OS's.
>> This patch avoids this issue by having the PCI code assign all PCI
>> interrupts to IRQ 9, matching the IRQ assignments from the 
>ACPI tables.
>How does QEMU deal with this possible confusion? Does it use different 
>BIOS tables?
>  -- Keir

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