++ Alex Williamson, kvm, Hi Christoph, Thank you for quick reply. If we want to add this in vfio then I think we need to do the same in uio case also. As I mentioned in previous mail, in the current implementation resource information (address and size) is gathering from resource named file created in /sys directory. So I expect it would be better to have similar method as existing in sysfs. Regards, Srinath. On Thu, Jun 14, 2018 at 3:50 PM, Christoph Hellwig <hch@xxxxxx> wrote: > The only safe way to use PCI(e) devices in userspace is through vfio. > I think that is where you need to take your inquiries.