Hi Favel, On 06/23/2015 10:50 AM, Pavel Fedin wrote: > Hello! > >> I was talking about what >> is done without this "gsi direct mapping" feature. In that case the low >> GSI numbers are used by irqchip routing entries. So kvm_irqchip_get_virq >> returns a gsi beyond the irqchip routed gsi's. > > But aren't these low numbers just routed by the qemu too? I don't see qemu getting any predefined > routing from the kernel. (some) iqrchip routing is set through kvm_irqchip_add_irq_route. hw/i386/kvm/ioapic.c hw/intc/openpic_kvm.c kvm_irqchip_add_irq_route uses kvm_add_routing_entry and this is this latter that uses set_gsis which books gsi's. there is also a default gsi routing table set in kvm archi specific code. Best Regards Eric kvm_init_irq_routing() allocates used_gsi_bitmap as all zeros, and > kvm_irqchip_get_virq() just starts to give those free numbers, starting from zero. I believe during > machine init we allocate virq's and route them to irqchip explicitly, don't we ? > Sorry for being perhaps ignorant, i haven't studied x86 qemu code too much. > > Kind regards, > Pavel Fedin > Expert Engineer > Samsung Electronics Research center Russia > > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
