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

[M A Young <m.a.young@xxxxxxxxxxxx>]

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.
        Michael Young

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