Re: qtest with multiple driver instances

[Thomas Huth <thuth@redhat.com>]

On 24/09/2020 13.57, Christian Schoenebeck wrote:
> 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!

I assume you are referring to the "qos" framework within the qtests? I
hope Laurent, Paolo or Emanuele can help with that question (now all on
CC:)...

 Thomas