[Bug 264172] nvme(4): PM9A1 NVMe Samsung 512GB no longer available with 13.1-RELEASE (was working with 13.0)

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 30 May 2022 14:14:03 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264172

--- Comment #9 from Warner Losh <imp@FreeBSD.org> ---
Does a -current snapshot have the same issue?

vmm is this "thing" Intel invented. It's designed to be raid without the
hassles, but it falls well short of that design goal. Basically, the nvme
drives need to be accessed via the ACHI controller, and vmm.c provides that
glue in what's supposed to be a seamless way.

If it works with a -current snapshot, then vmm isn't broken there and we're
missing some key bit of code in 13.1. If it is broken there, then that's a
whole different problem to solve (a currently unknown issue with vmm). I
disabled VMM on my laptop years ago, and am reluctant to re-enable it since
I'll have to back/restore windows in the process, which was the better part of
a day for me the last time I fought with it...  Though if I do that, I can
upgrade my BIOS and maybe run Windows 11 (if only I had a day to burn on
this...)

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