Re: [Qemu-devel] Re: [PATCH] PCI: Bus number from the bridge, not the device

[Michael S. Tsirkin]

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.

> > It's probably required to make them stable anyway.
> > 
> Why?

To avoid bus renumbering on reboot after you add a pci-to-pci bridge.

-- 
MST