Hi ,
I just glaced at the x86 code, here nr_irqs are set to 1024, which includes
normal irq's and MSI's. Memory for these descriptors are allocated at boot time.
is it correct?
int __init init_irq_data(void)
{
...
for (vector = 0; vector < NR_VECTORS; ++vector)
this_cpu(vector_irq)[vector] = INT_MIN;
irq_desc = xzalloc_array(struct irq_desc, nr_irqs);
...
}
In xen/include/asm-x86/irq.h
#define MSI_IRQ(irq) ((irq) >= nr_irqs_gsi && (irq) < nr_irqs)
Regards
Vijay
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