[Intel-gfx] [PATCH 3/7] vfio/pci: Allow passing zero-length fd array in VFIO_DEVICE_PCI_HOT_RESET

[Jason Gunthorpe]

On Thu, Mar 23, 2023 at 10:21:48AM +0000, Liu, Yi L wrote:
> > It would also be a nice touch to include a new vfio_pci_hot_reset_info
> > that returns the dev_id's of the other devices in the reset group
> > instead of a BDF. It would be alot easier for userspace to work with.
> 
> Yeah, just as we are chatting in another thread. Btw. Do we expect the
> new _INFO ioctl that return dev_ids work for the legacy group path under
> compat mode? If no, then I may need to organize this series after cdev
> series since dev_id is returned to user in cdev series.

It shouldn't matter, just go through evey device, check if it is open,
check if it has an iommufd_ctx that its the same as the current device
and then convert the bind object to a dev_id.

Shouldn't matter one bit how iommufd got attached

It isn't usable without the cdev series, but it can safely be put
ahead of it.

Jason