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If we are mapping BARs that are smaller than 4k, we can't mmap it into memory.
For those cases, we would like to be able to have the option to use read/write abstraction instead.

Work to support it is already upstream (qemu-kvm.git), at commits:

8845b723
d79e4458
be5a9efb
c890e259

*** Bug 679386 has been marked as a duplicate of this bug. ***

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
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    New Contents:
KVM device assignment: Added support for devices making use of sub-4k MMIO PCI BARs.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0534.html

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0534.html