[PATCH 2/2] nvme: remove virtual boundary for sgl capable devices

[Christoph Hellwig]

On Tue, Aug 05, 2025 at 12:56:08PM -0700, Keith Busch wrote:
> From: Keith Busch <kbusch at kernel.org>
> 
> The nvme virtual boundary is only for the PRP format. Devices that can
> use the SGL format don't need it for IO queues. Drop reporting it for
> such PCIe devices; fabrics target will continue to use the limit.

That's not quite true any more as of 6.17.  We now also rely it for
efficiently mapping multiple segments into a single IOMMU mapping.
So by not enforcing it for IOMMU mode.  In many cases we're better
off splitting I/O rather forcing a non-optimized IOMMU mapping.