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Date: Fri, 09 Sep 2011 15:35:44 +0800
From: Wen Congyang <wency@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [PATCH] pci: add standard bridge device
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Isaku Yamahata <yamahata@valinux.co.jp>, Avi Kivity <avi@redhat.com>, qemu-devel@nongnu.org

At 09/09/2011 03:34 PM, Michael S. Tsirkin Write:
> On Fri, Sep 09, 2011 at 03:24:54PM +0800, Wen Congyang wrote:
>> At 09/09/2011 03:12 PM, Michael S. Tsirkin Write:
>>> On Fri, Sep 09, 2011 at 02:43:24PM +0800, Wen Congyang wrote:
>>>>> However, filtering doesn't work.  You could put a BAR outside the
>>>>> filtered area and it would be visible to the guest.
>>>>>
>>>>
>>>> I test it on real hardware. If I put a BAR outside the filterer area, and
>>>> then run 'lspci -vv', the BAR does not change:
>>>
>>> ...
>>>
>>>
>>>> The BAR1 is feafbc00, and it is in the bus2's range.
>>>> I map the BAR(mmap /sys/bus/pci/devices/0000\:03\:01.0/resource1), and find
>>>> I can read and write the memory.
>>>>
>>>> Thanks
>>>> Wen Congyang
>>>
>>> So, it's as expected. Nothing seems wrong with this picture. But
>>> this is not the test that Avi suggested.
>>
>> Sorry for my misunderstand.
>> My question is: How to put a BAR outside the filterer area,
> 
> Write into address/limit registers on the bridge to make them
> not cover the BAR behind.
> 
>> and how to know
>> whether it is visible?
>>
>> Thanks
>> Wen Congyang
> 
> Read the BAR memory as you did.


Thanks for your explain.
Wen Congyang