qemu uses the etc/e820 fw_cfg file not only for memory, but
also for reservations. Handle reservations by adding resource
descriptor hobs for them.
A typical qemu configuration has a small reservation between
lapic and flash:
# sudo cat /proc/iomem
[ ... ]
fee00000-fee00fff : Local APIC
feffc000-feffffff : Reserved <= HERE
ffc00000-ffffffff : Reserved
[ ... ]
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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