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

[Gleb Natapov]

On Mon, Nov 22, 2010 at 04:50:29PM +0200, Michael S. Tsirkin wrote:
> On Mon, Nov 22, 2010 at 03:04:51PM +0200, Gleb Natapov wrote:
> > On Mon, Nov 22, 2010 at 10:16:57AM +0200, Michael S. Tsirkin wrote:
> > > On Mon, Nov 22, 2010 at 09:37:07AM +0200, Gleb Natapov wrote:
> > > > > > > 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?
> > > 
> > > Stable bus numbering is a feature *users* care about, because
> > > some Guest OSes get confused when a card gets moved to another
> > > bus.
> > > 
> > So if user cares about it it should not change HW configuration of QEMU.
> > I guess those OSes knows how to handle hot-pluggable equipment otherwise
> > they will get confused on real HW too. Why QEMU should care to preserve
> > something in a face of configuration change?
> > 
> > --
> >                     Gleb.
> 
> We've been there, weren't we? See
> http://fedoraproject.org/wiki/Features/KVM_Stable_PCI_Addresses#KVM_Stable_PCI_Addresses
> 
This is about stable HW configuration.

--
                        Gleb.