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xen64: add identity irq->vector map
The x86_64 interrupt subsystem is oriented towards vectors, as opposed to a flat irq space as it is in x86-32. This patch adds a simple identity irq->vector mapping so that we can continue to feed irqs into do_IRQ() and get a good result. Ideally x86_32 will unify with the 64-bit code and use vectors too. At that point we can move to mapping event channels to vectors, which will allow us to economise on irqs (so per-cpu event channels can share irqs, rather than having to allocte one per cpu, for example). Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -1085,8 +1085,25 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
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},
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};
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static void __init __xen_init_IRQ(void)
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{
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#ifdef CONFIG_X86_64
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int i;
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/* Create identity vector->irq map */
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for(i = 0; i < NR_VECTORS; i++) {
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int cpu;
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for_each_possible_cpu(cpu)
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per_cpu(vector_irq, cpu)[i] = i;
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}
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#endif /* CONFIG_X86_64 */
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xen_init_IRQ();
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}
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static const struct pv_irq_ops xen_irq_ops __initdata = {
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.init_IRQ = xen_init_IRQ,
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.init_IRQ = __xen_init_IRQ,
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.save_fl = xen_save_fl,
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.restore_fl = xen_restore_fl,
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.irq_disable = xen_irq_disable,
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