With a help of negative memory region priority PCI address space
is mapped underneath RAM regions effectively catching every access
to addresses not mapped by any other region.
It simplifies PCI address space mapping into system address space.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
(cherry picked from commit 83d08f2673)
*prereq for ddaaefb backport
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>