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:

> 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
void __setup_vector_irq(int cpu)
{
    int irq, vector;
    struct irq_cfg *cfg;

    /* Clear vector_irq */
    for (vector = 0; vector < NR_VECTORS; ++vector) {
        per_cpu(vector_irq, cpu)[vector] = -1;
        printk("__setup_irq_vector: setting vector_irq[%d]=-1 for 
cpu=%d\n",
               vector, cpu);
        }
    /* Mark the inuse vectors */
    for (irq = 0; irq < nr_irqs; ++irq) {
        cfg = irq_cfg(irq);
        if (!cpu_isset(cpu, cfg->domain))
            continue;
        vector = irq_to_vector(irq);
        per_cpu(vector_irq, cpu)[vector] = irq;
        printk("__setup_irq_vector2: setting vector_irq[%d]=%d for 
cpu=%d\n",
               vector, irq, cpu);
    }
}
but my debugging suggests it is only actually happening for irq[240]

        Michael Young

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