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From: Marcel Apfelbaum <marcel@redhat.com>
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Date: Mon, 16 Nov 2015 12:10:07 +0200
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Subject: Re: [Qemu-devel] [PATCH V2 0/4] hw/pcie: Multi-root support for Q35
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To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org
Cc: imammedo@redhat.com, rth@twiddle.net, kraxel@redhat.com, ehabkost@redhat.com, mst@redhat.com

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
>