https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233960
Bug ID: 233960
Summary: Add Volume Management Device (VMD) stub driver
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: dave.fug...@gmail.com
Created attachment 200058
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200058&action=edit
VMD Driver Patch
At a high-level, "Intel® VMD enables hot swap replacement of NVMe* SSDs from
the PCIe* bus without shutting down the system while standardized LED
management helps provide quick identification of SSD status."
This is realized through the addition of a VMD controller on the PCIe bus of
high-end systems (e.g., Xeon) which "hides" 1 to N PCIe ports underneath it.
As you might imagine, this implies the need for a VMD driver which either
delegates incoming NVMe requests to the appropriate drivers (e.g., NVMe,
hot-plug, etc.) or a VMD driver which incorporates the NVMe, hot-plug, etc.
functionality all on its own.
FreeBSD is missing either such type of VMD driver today, and consequently
end-users like Netflix are getting the mistaken impression FreeBSD doesn't have
a driver for their invisible NVMe devices or the NVMe devices are broken...
Attached to this bug report is a patch adding a VMD stub driver informing the
end-user they should disable the VMD feature in their BIOS. This stub driver
is a stop-gap measure to eventually be replaced with a full-fledged VMD driver
(I work for the NVMe/VMD OSS driver team at Intel).
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