On Sun, Nov 21, 2010 at 10:39:31PM +0200, Michael S. Tsirkin wrote: > On Sun, Nov 21, 2010 at 09:29:59PM +0200, Gleb Natapov wrote: > > > We can control the bus numbers that the BIOS will assign to pci root. > > And if you need to insert device that sits behind pci-to-pci bridge? Do > > you want to control that bus address too? And bus number do not > > unambiguously > > describe pci root since two roots can have same bus number just fine. > > They have to have different segment numbers. > AKA PCI domains AKA one more number assigned by a guest.
> > > It's probably required to make them stable anyway. > > > > > Why? > > To avoid bus renumbering on reboot after you add a pci-to-pci bridge. > Why should qemu care? -- Gleb.