Re: [Xen-devel] xen 4 only seeing one keyboard and mouse

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sat, Aug 21, 2010 at 10:00:37PM +0100, M A Young wrote:
> On Mon, 16 Aug 2010, Konrad Rzeszutek Wilk wrote:
> 
> >The one thing that is odd is that in 4.0 we start with vector 0x28 while
> >in 3.4 it is with 0x20.
> >
> >It looks as if one vector is getten eaten. But that should not be such
> >an issue as the internal mapping of vector->irq is still proper...
> 
> I can tell you why that happens.
> For 3.4 new vectors are allocated in the order 32,40,...,216 then
> 33,41,... etc. in assign_irq_vector from xen/arch/x86/irq.c
> For 4.0 new vectors are allocated in the order 40,48,...,216 then
> 33,41,... etc. in __assign_irq_vector from xen/arch/x86/irq.c
> So for 4.0 the allocation of vector 32 is never attempted, but as it
> is already reserved for IRQ_MOVE_CLEANUP_VECTOR this shouldn't
> matter.

Argh. So red-heering then.

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