Re: Question about interrupt routing and irq allocation

[Jeremy Fitzhardinge <jeremy@goop.org>]

Ingo Molnar wrote:
>> I'm initially targeting 32-bit, though obviously I'd like something 
>> that works for both 32 and 64 bit.  irq_cfg[] is missing in 
>> io_apic_32.c; would I achieve the same effect by setting 
>> irq_vector[irq] = 0xff or something?
>>     
>
> ok, here comes the next phase of a rather cunning plan: please unify 
> these vector allocators first! ;-)
>   

Somehow I knew you were going to say that...

> it's nontrivial but would result in rather nice code. I dont know 
> whether we want to extend per-CPU vectors to 32-bit as well ... but 
> might be worth an attempt and we could give any exploratory patches a 
> try in -tip. Eric, what do you think about the general approach?
>
> this would also pave the way towards unified APIC code. Hm

All of that sounds very appealing, particularly as the work on xen-dom0 
continues.  But in the meantime I'm just using create_irq(), and I'll 
wear the wasted vector (after all, it will only happen when booting 
under Xen-hvm).

    J