On 13/05/2015 12:25, Jan Kiszka wrote: >>>> But perhaps when enabling KVM_SPLIT_IRQCHIP we can use args[0] to pass >>>> the number of IOAPIC routes that will cause EOI exits? >>> >>> And you need to ensure that their routes can be found in the table >>> directly. Given IOAPIC hotplug, that may not be the first ones there... >> >> Can you reserve a bunch of GSIs at the beginning of the GSI space, and >> use rt->map[] to access them and build the EOI exit bitmap? > > Ideally, userspace could give the kernel a hint where to look. It has a > copy of the routing table and manages it, no? Well, reserving space at the beginning of the table (and communicating the size via KVM_ENABLE_CAP is a way to "give the kernel a hint where to look". Perhaps not the best, but simple and supports hotplug to some extent. Paolo -- 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
