> > > Every hotplug-capable bus must have a proper addressing scheme, I think > > > this is a reasonable and achievable requirement. Then we don't need > > > instance numbers for those buses. > > > > What about USB? > > USB has useful device addresses (physical ports). > These aren't used by most of the higher-level protocols (logically USB is a > flat bus structure), but the physically tree topology is still there if you > look hard enough. ... and thinking about it a bit more, this adds an extra addressing possibility. USB devices have both physical and logical. The physical addresses is which port the device is plugged into (including port addresses of any intermediate hubs). These never change, so should be the canonical address. The logical address is set by the guest OS so may change (or be absent). Most software uses the logical address, so this is by far the most useful option for mapping from a guest device to a qemu device. Paul -- 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
