On Sun, Nov 28, 2010 at 08:11:45PM +0100, Peter Stuge wrote:
Peter Stuge wrote:
Specifying boot device using PCI BDF is a great example of using common structured data. That BDF exists both in machine and firmware data models.
Gleb Natapov wrote:
Bus numbers are assigned by a guest. Qemu knows nothing about them, so it specify device path by topology.
Quite. By BDF I of course mean topology. ;)
Ah, then we are in violent agreement :)
The BDF itself is not much better than a BBS concept, since only the firmware knows the details.
But the topology is common, even if bus number differs between machine and firmware.
How is the topology structured? I'm not sure that firmware can use a "slot" number. Device number on the bus works, is that what you mean?
To specify device path to PCI card using topology one needs to specify slot.fn of all pci-to-pci buses from pci host controller to pci device in question.