Paul Brook <p...@codesourcery.com> writes: >> > Bus names are chosen by the system as follows: >> > >> > * If the driver of the parent device model provides a name, use that. >> > >> > * Else, if the parent device has id ID, use ID.NUM, where NUM is the bus >> > >> > number, counting from zero in creation order. >> > >> > * Else, use TYPE.NUM, where TYPE is derived from the bus type, and NUM >> > >> > is the bus number, as above. >> > >> > ### Paul proposes to drop ID.NUM. >> >> ABI change: "-device lsi,id=my-scsi -device scsi-disk,bus=my-scsi.0" no >> longer works. > > IMO this is a fundamentally broken ABI, so I don't care.
Users of this ABI won't appreciate that attitude. I do support dropping ID.NUM, but we owe our users due ABI diligence. >> > ### Paul proposes to either drop TYPE.NUM (and require drivers to >> > provide bus names), or make NUM count separately for each bus type. >> >> Likewise. > > I'd be surprised if anyone actually uses absolute device paths at this time, > and they're probably going to be broken by other changes. Yes. > Using these default bus names as global identifiers is fixable using aliases > (e.g. -device lsi,bus=pci.0). I'd expect this to cover most interesting uses. > See http://lists.nongnu.org/archive/html/qemu-devel/2010-06/msg02149.html Keeping the old bus names work for the buses we create automatically shouldn't be hard. Only a few, and no ID.NUM there. It's the user-created buses that worry me.
