Re: [Qemu-devel] [PATCH V2 0/4] hw/pcie: Multi-root support for Q35

[Marcel Apfelbaum]

On 11/16/2015 12:03 PM, Paolo Bonzini wrote:
> On 16/11/2015 11:02, Marcel Apfelbaum wrote:
> > Actually the command line would work. The devices will be placed on the
> > root bus
> > instead of the pci bridge bus. The trick here is that we name the bus
> > the devices
> > will be attached to by the pxb id.
> >   - When we have the bridge -> the pxb id will be used for the secondary bus
> >   - when don't have the bridge -> the pxb id wil be used for the root bus.
> > Both times the command line remains -device pxb,id=my_root -device
> > e1000,bus=my_root
>
> What would you lose?  Hotplug?

Without the bridge? Yes.
However the user can add it manually the pci-bridge and have it anyway.

I wanted to get rid of the internal pci-bridge as a default, and this is why
pxb and pxb-pcie are he same device now (except bus type)



> Paolo