[PATCH RFC] nvme-ioctl: propagate PRP1 from ioctl to admin cmd

[Keith Busch]

On Fri, Jun 26, 2026 at 07:55:32PM +0200, David Epping wrote:
> Thank you both for your feedback, I get the point. I'll definitely look
> into using SRIOV or SPDK to migrate the system to an unmodified upstream
> NVMe driver mid-term.

SRIOV could definitely get you there with existing capable hardware and
software as long as you don't need to exceed the VF count, but it is a
bit heavy for what you're describing.

My SIOV suggestion is more fine grained for similar use cases, however
there's no nvme standard or kernel support for the feature, so anything
using the concepts would be a custom solution; NVMe would need some
mechanism to associate an IO queue to a PASID, then attach namespace
access to that queue. After that it's just a matter of implementing the
"mediated" device.

If you're interested, this is a recent proposal to generically setup
SIOV, but it needs some work:

  https://lore.kernel.org/linux-pci/20260604150153.3619662-1-dimitri.daskalakis1@gmail.com/