Now, it's impossible to arrange devices into multi-pci-bus,
for example:
<sound model='ac97'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x1' slot='0x02' function='0x0'/>
</video>
libvirt will complain about "bus != 0",
fortunately, qemu supports pci-to-pci bridge,
if we want to use multi-pci-bus, we can define
2 pci bridge controllers, then attach 1 to the other
as a subordinate pci-bus, so, 2 pci-buses appear.
for example:
<controller type='pci-bridge' index='0'/>
<controller type='pci-bridge' index='1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'
bridge='0'/>
</controller>
<sound model='ac97'>
<address type='pci' domain='0x0000' bus='0x01' slot='0x02' function='0x0'
bridge='1'/>
</sound>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'
bridge='0'/>
</video>
src/conf/device_conf.c | 11 ++++++++++-
src/conf/device_conf.h | 1 +
src/conf/domain_conf.c | 5 ++++-
src/conf/domain_conf.h | 1 +
src/qemu/qemu_command.c | 25 ++++++++++++++++++++-----
5 files changed, 36 insertions(+), 7 deletions(-)
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