Re: [libvirt] [PATCH 0/3] add pci-bridge device and address type
On Wed, Dec 26, 2012 at 09:00:06AM +0800, liguang wrote:
Now, it's unnecessary 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 devices then attach 1 to the other
as a subordinate pci-bus, so, 2 pci-buses appear.
for example:
<pci-bridge type='root'/>
<pci-bridge type='subordinate'>
<address type='pci-bridge' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
</pci-bridge>
We shouldn't be introducing a new <pci-bridge> device for this. The
existing <controller> element is intended to handle all types of bus
devices. Just need to define a new controller type.
Daniel
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