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. -- MST
