Re: [Qemu-devel] [PATCH] pci: add standard bridge device

[Avi Kivity]

On 09/02/2011 05:56 AM, Wen Congyang wrote:
> >
> >  You could use something like kvm-unit-tests.git to write a simple test
> >  that sets up a BAR (say from hw/ivshmem.c), writes and reads to see that
> >  it is visible, programs the bridge to filter part of the BAR out, then
> >  writes and reads again to verify that the correct part is filtered out.
>
> I am testing ivshmem now. But I do not know how to access the memory
> specified in the BAR.

Use the uio driver - 
http://docs.blackfin.uclinux.org/kernel/generated/uio-howto/.  You just 
mmap() the BAR from userspace and play with it.

--
error compiling committee.c: too many arguments to function