Re: [Qemu-devel] [PATCH V4] hw/pxb: add chassis_nr property

[Cao jin <caoj.fnst@cn.fujitsu.com>]

hi

On 03/15/2016 07:44 PM, Marcel Apfelbaum wrote:
> On 03/15/2016 10:00 AM, Cao jin wrote:

>>
>> And I have another personal question: In qemu design, it seems every
>> pci bridge reside in a separate chassis, what`s benefit?  why don`t
>> put them all in the main chassis?
>
> Please have a look on pci-to-pci bridge specification, chapter 13, slot
> numbering.
>

thanks for the hint.
I still have a question: in docs/pci_expander_bridge.txt, it says: 
create a TYPE_PCI_BRIDGE_DEV to enable hotplug support.
But I didn`t see it can hotplug as following step:

1: ./qemu-system-x86_64 -device pxb,id=br,bus=pci.0,bus_nr=2 -hda 
linux.img -smp 2 --enable-kvm -m 1024 -monitor stdio

2: in monitor, type: device_add e1000,bus=br
result: no message output to monitor, and don`t see e1000 nic in guest

Is is a bug or I test it in a wrong way?

-- 
Yours Sincerely,

Cao jin