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When assigning an interrupt to a vcpu, it is not unlikely that the level of the hierarchy implementing irq_set_vcpu_affinity is not the top level (think a generic MSI domain on top of a virtualization aware interrupt controller). In such a case, let's iterate over the hierarchy until we find an irqchip implementing it. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>