Re: [PATCH v6 12/24] vfio/pci: Allow passing zero-length fd array in VFIO_DEVICE_PCI_HOT_RESET

Jason Gunthorpe
2023-03-10T17:45:22Z

On Fri, Mar 10, 2023 at 06:04:02AM +0000, Liu, Yi L wrote:
> > From: Tian, Kevin <kevin.tian@intel.com>
> > Sent: Friday, March 10, 2023 1:31 PM
> >
> > > From: Yi Liu
> > > Sent: Wednesday, March 8, 2023 9:29 PM
> > >
> > > This is another method to issue PCI hot reset for the users that bounds
> > > device to a positive iommufd value. In such case, iommufd is a proof of
> > > device ownership. By passing a zero-length fd array, user indicates kernel
> > > to do ownership check with the bound iommufd. All the opened devices
> > > within
> > > the affected dev_set should have been bound to the same iommufd. This
> > is
> > > simpler and faster as user does not need to pass a set of fds and kernel
> > > no need to search the device within the given fds.
> > >
> > > Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> > > Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> >
> > I think you also need a s-o-b from Jason since he wrote most of the
> > code here.
>
> Yes, it is. I'll add it if no objection from Jason.

Go ahead

Jason