Re: [Qemu-devel] [PATCH] pci: implement bridge filtering

[Wen Congyang <wency@cn.fujitsu.com>]

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