On Thu, Apr 6, 2017 at 11:10 AM, Burakov, Anatoly <anatoly.bura...@intel.com > wrote:
> Hi Alejandro, > > > Yes, the code was not aware of that possibility. Being honest, I knew > about that, but not in my mind when implementing the code. I have just > cards where each PF even VF have their own VFIO group. This could be a > problem for testing. > > Anatoly, do you have a system with that peculiarity? > > I think if you compile an old kernel (like a 3.6), you should be able to > reproduce the behavior. (at least I am able to do this with an old kernel) > > It turns out the container is not removed while it has users, and having a group file descriptor opened implies an active user. So we need another approach. The kernel does not give any information we can use (and maybe it requires a patch for fixing a potential problem regarding group closing) but we can track number of devices in a group easily and close the group when last device is closed. I have tested this approach and it works for the single device per group case, which is the one I can test by now. But I'm not sure I understood this comment about using a old kernel for testing the multiple devices per group case. Can you confirm if I understood this correctly? If I use an old kernel, devices like VFs are created in the same IOMMU group? Thanks > Thanks, > Anatoly >
