Here's a generic answer to the question "which of the device's buses is
this?"
int qbus_index(BusState *bus)
{
BusState *b;
int i, index;
index = -1;
i = 0;
QLIST_FOREACH(b, &bus->parent->child_bus, sibling) {
if (b == bus) {
index = i;
}
i++;
}
assert(0 <= index && index < i);
return i - 1 - index;
}
The bus created first has index 0.
Note that the child_bus holds the children in reverse creation order,
and we can't traverse it backwards. Same problem also visible with
makes info qtree:
dev: piix3-ide, id ""
[...]
bus: ide.1
type IDE
bus: ide.0
type IDE
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