RE: [Xen-devel][IPF][PATCH]Make shutdown work on IPF

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Keir Fraser write on 2006年11月13日 16:29:
> On 13/11/06 8:18 am, "Xu, Anthony" <anthony.xu@xxxxxxxxx> wrote:
> 
>> We can see that this BAR is at offset 0x40, so it is a
>> device-specific BAR rather than normal PCI BAR, It should be ACPI
>> driver(which is in Guest BIOS)'s responsibility to program this BAR
>> rather than PCI enumeration. 
> 
> Does this BAR not get set up properly in current qemu? 

Yes, this BAR get setup properly in current qemu by pci_bios_init,
But this BAR is passed to Guest OS thru ACPI afdt table,
this BAR is hardcoded to 0xc010 in ACPI afdt table.

So if pci_bios_init doesn't allocate 0xc010 to this BAR,
Shutdown can't work.


>It looks to me
> like the existing code sets up this region as a standard PCI BAR?
Yes, the existing code sets up this region as a standard PCI BAR


Anthony

> Maybe I need to go read the PIIX spec.
> 
>  -- Keir
> 
> 
> 
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