[Bug 283189] Sporadic NVMe DMAR faults since updating to 14.2-STABLE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283189

--- Comment #7 from John Baldwin <jhb@FreeBSD.org> ---
Keep in mind that the 'len' field in an NVMe WRITE command is not a byte count,
it is a count of LBAs, where the LBA size is determined by the LBA formats in
the namespace's associated nsdata (which you can see via `nvmecontrol identify
ndaX`).  Thus, if the LBA is 512, a len=8 is actually a 8*512 == 4k write
request.

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