On Wed, Jan 07, 2026 at 04:56:05PM +0100, Christian König wrote:

quoted

But I am wondering why not make it as one subsystem interface, such as nvme
ioctl, then the whole implementation can be simplified a lot. It is reasonable
because subsystem is exactly the side for consuming/importing the dma-buf.

Yeah that it might be better if it's more nvme specific came to me as well.

The feature is in no way nvme specific.  nvme is just the initial
underlying driver.  It makes total sense to support this for any high
performance block device, and to pass it through file systems.