Our vendor told us that this is a generic problem with the following
supermicro board/system and many nvme ssd devices:

Board: H12SSW-NT

Servertype: Supermicro AS -1114S-WTRT
https://www.supermicro.com/Aplus/system/1U/1114/AS-1114S-WTRT.cfm

so it seems this is not kernel related, afaik.

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https://bugs.launchpad.net/bugs/1998224

Title:
  pcie hotplug not working in linux-generic-hwe-18.04 5.4.0.107.121~18

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  situation: ubuntu 18.04 server install on a supermicro x64 host.

  hot plug NVME ssd into NVME U.2 HotSwap Slot.

  problem: hot plug does not work/ nvme is not recognised.

  how to test:

  echo 1 > /sys/bus/pci/rescan

  dmesg output:

  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.1: bridge window [io  
0x1000-0x0fff] to [bus 41] add_size 1000
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.2: bridge window [io  
0x1000-0x0fff] to [bus 42] add_size 1000
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.1: BAR 13: no space for [io  
size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.1: BAR 13: failed to assign 
[io  size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.2: BAR 13: no space for [io  
size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.2: BAR 13: failed to assign 
[io  size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.2: BAR 13: no space for [io  
size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.2: BAR 13: failed to assign 
[io  size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.1: BAR 13: no space for [io  
size 0x1000]
  [Mon Nov 28 15:46:33 2022] pcieport 0000:40:01.1: BAR 13: failed to assign 
[io  size 0x1000]

  Kernel Version:

  5.4.0-107-generic #121~18.04.1-Ubuntu SMP Thu Mar 24 17:21:33 UTC 2022
  x86_64 x86_64 x86_64 GNU/Linux

  hardware information: tried with micron and intel NVME, e.g:

  INTEL SSDPE2KE016T8

  after a reboot, the NVME is recognized, so there is no hardware
  problem.

  if you need additional debug information, feel free to ask.

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