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

From: Cao jin
Subject: Re: [Qemu-devel] [PATCH V4] hw/pxb: add chassis_nr property
Date: Thu, 17 Mar 2016 18:02:13 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0


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

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

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