Re: [Xen-devel] dom0 kernel fails to recognize DVD drive on piix controller

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.04.16 at 12:35, <olaf@xxxxxxxxx> wrote:
> On Thu, Apr 21, Jan Beulich wrote:
> 
>> >>> On 21.04.16 at 11:52, <olaf@xxxxxxxxx> wrote:
>> > On Thu, Apr 21, Jan Beulich wrote:
>> > 
>> >> Does the device actually use IRQ19, or does it instead use IRQ14
>> >> and IRQ15 (which then may require some special casing somewhere)?
>> > 
>> > How do I find out?
>> 
>> Check what the native kernel uses.
> 
> Yeah, silly question. Sorry.
> 
> Its indeed 14/15:
>  14:        139        115   IO-APIC  14-edge      ata_piix
>  15:          0          0   IO-APIC  15-edge      ata_piix
> 
> So does that special handling have to be done in Xen or in dom0?

In Dom0 I would guess - Xen can't do anything about Dom0's
understanding of interrupts, and from the looks of it Dom0 only
sets up IRQ19 here, ignoring the two legacy interrupts.

Jan


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