qtest with multiple driver instances

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

Hi,

I'm currently puzzled with what looks like a limitation of the qtest 
infrastructure: am I right that it's not possible to use multiple instances of 
the same driver with qtests?

Purpose: I need to add test cases for the 9p 'local' fs driver. So far we only 
have 9p qtests using the 'synth' fs driver. The problem is, both driver 
instances would pop up with the same QEMU driver name ("virtio-9p-pci"), and 
AFAICS qtests in general reference their driver instance by driver name only, 
which must be a) a unique driver name and b) must match the official QEMU 
driver name and c) all qtest driver instances are in a global space for all 
qtests.

Is there any workaround or something that I didn't see? Like letting qtests 
reference a driver instance by PCI address or something?

Right now the only option that I see is a hack: forcing one driver instance to 
use a different bus system like e.g. -> "virtio-9p-ccw" vs. "virtio-9p-pci".

Any hint appreciated!

Best regards,
Christian Schoenebeck