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

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

On Thu, 26 Aug 2010, M A Young wrote:

> On Thu, 26 Aug 2010, M A Young wrote:
>
> > Okay, here is my first attempt at dirty debugging. I have made a patch to 
> > try to track where vector_irq is being changed (attached) and have also 
> > attached. I have looked at it quickly, and I don't think some low IRQs are 
> > getting set on the second CPU.
> My next thoughts on this are that almost all IRQs allocated on the first cpu 
> before the second is started aren't initialized on the second CPU. I presume 
> that __setup_vector_irq from xen/arch/x86/irq.c is where it is supposed to 
> happen
or perhaps it should happen in io_apic_set_pci_routing from 
xen/arch/x86/io_apic.c where the higher IRQs are set (it doesn't because 
__assign_irq_vector sees the IRQ is already in use
     old_vector = irq_to_vector(irq);
    if (old_vector) {
        cpus_and(tmp_mask, mask, cpu_online_map);
        cpus_and(tmp_mask, cfg->domain, tmp_mask);
        if (!cpus_empty(tmp_mask)) {
            cfg->vector = old_vector;
            return 0;
        }
    }
but seems to miss the fact that it is only actually configured for one 
cpu.
        Michael Young

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