[Bug 289779] FreeBSD 15.0 NVMe disk hot add&remove needs reboot to validate

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289779

            Bug ID: 289779
           Summary: FreeBSD 15.0 NVMe disk hot add&remove needs reboot to
                    validate
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards@FreeBSD.org
          Reporter: yanhuih@vmware.com

Tested FreeBSD 15.0 64bit ALPHA3 ISO Image installation on vSphere, and found
that the VM needs reboot after hot adding a NVMe hard disk to an existing NVMe
controller or hot removing a NVMe hard disk from a NVMe controller.

But for FreeBSD 14.x like FreeBSD 14.3, it doesn't need to reboot for
recognizing the newly added NVMe hard disk like by lsblk command.

# lsblk
DEVICE         MAJ:MIN SIZE TYPE                                    LABEL MOUNT
da0              0:86   20G GPT                                         - -
  da0p1          0:87  512K freebsd-boot                     gpt/gptboot0 -
  <FREE>         -:-   492K -                                           - -
  da0p2          0:88  2.0G freebsd-swap                 gpt/freebsd-swap SWAP
  da0p3          0:89   18G freebsd-zfs                   gpt/freebsd-zfs <ZFS>
  <FREE>         -:-   1.0M -                                           - -
nda0             0:83  1.0G -                                           - -

Would you please take a look at this issue on FreeBSD 15.0?

Thanks!
Yanhui

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