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Date: Wed, 14 Sep 2011 09:48:06 +0800
From: Wen Congyang <wency@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [PATCH] pci: implement bridge filtering
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Isaku Yamahata <yamahata@valinux.co.jp>, qemu-devel@nongnu.org

At 09/05/2011 02:13 AM, Michael S. Tsirkin Write:
> Support bridge filtering on top of the memory
> API as suggested by Avi Kivity:
> 
> Create a memory region for the bridge's address space.  This region is
> not directly added to system_memory or its descendants.  Devices under
> the bridge see this region as its pci_address_space().  The region is
> as large as the entire address space - it does not take into account
> any windows.
> 
> For each of the three windows (pref, non-pref, vga), create an alias
> with the appropriate start and size.  Map the alias into the bridge's
> parent's pci_address_space(), as subregions.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> 
> The below seems to work fine for me so I applied this.
> Still need to test bridge filtering, any help with this
> appreciated.
> 


I test bridge filtering, and the BAR still can be visible on guest even if
I change the memory region.

Thanks
Wen Congyang