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

[Avi Kivity <avi@redhat.com>]

On 09/20/2011 02:55 PM, Michael S. Tsirkin wrote:
> >
> >  Hi Michael S. Tsirkin:
> >  I test pci bridge filtering on real hardware, and I find that I can mmap
> >  the resource after I change the memory base and memory limit(The BAR should
> >  be not visible on OS after changing the memory region).
> >
> >  So I try to write and read to the BAR. Here is my test result:
> >  1. Before changing the pci bridge's memory region, I can read and write to the memory, and
> >     I can get the same value that I write.
> >
> >  2. After changing the pci bridge's memory region, I can still read and write to the memory,
> >     but it is very slow, and I can not get the same value that I write(The value is always 0).
> >
> >  Does this result means that pci bridge filtering works fine?
> >
> >  Thanks
> >  Wen Congyang
>
> Sounds more or less right except I expect to get ffffffff
> and not 0. Avi, any idea?
>

No, what does the default handler do?

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error compiling committee.c: too many arguments to function