okay, it seems that both acpi_pci_hotplug and pci_hotplug are enabled for this kernel:
grep "CONFIG_HOTPLUG_PCI_ACPI=" /boot/config-`uname -r` CONFIG_HOTPLUG_PCI_ACPI=y grep "CONFIG_HOTPLUG_PCI=" /boot/config-`uname -r` CONFIG_HOTPLUG_PCI=y but still, hotplug is not working. the current situation is: I unplugged a correctly recognized Intel NVME and switched it for a Micron NVME, there is also a second intel nvme still installed. nvme list shows the intel nvme which remained in the system: nvme list Node SN Model Namespace Usage Format FW Rev ---------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- -------- /dev/nvme0n1 PHLN130100QJ1P6AGN INTEL SSDPE2KE016T8 1 1.60 TB / 1.60 TB 512 B + 0 B VDV10184 but when I look into /sys/, I still find shadows of the other intel nvme, which just got plugged out: find /sys/devices | egrep "nvme[0-9][0-9]?$" /sys/devices/pci0000:40/0000:40:01.1/0000:41:00.0/nvme/nvme0 /sys/devices/virtual/nvme-subsystem/nvme-subsys1/nvme1 /sys/devices/virtual/nvme-subsystem/nvme-subsys0/nvme0 also, nvme list-subsys, throws an error. I suppose because that old subsystem nvme-subsys1 does no longer exist, but is still referenced: nvme list-subsys free(): double free detected in tcache 2 Aborted googling the above error leads me to this bug report: https://github.com/linux-nvme/nvme-cli/issues/1707 when rescanning the pci bus via: echo 1 > /sys/bus/pci/rescan I get the following messages in dmesg: [Wed Feb 8 10:20:49 2023] pci 0000:c3:00.0: PCI bridge to [bus c4] [Wed Feb 8 10:20:49 2023] pci 0000:c3:00.0: bridge window [io 0xf000-0xffff] [Wed Feb 8 10:20:49 2023] pci 0000:c3:00.0: bridge window [mem 0xb8000000-0xb90fffff] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.1: bridge window [io 0x1000-0x0fff] to [bus 41] add_size 1000 [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.2: bridge window [io 0x1000-0x0fff] to [bus 42] add_size 1000 [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.1: BAR 13: no space for [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.1: BAR 13: failed to assign [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.2: BAR 13: no space for [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.2: BAR 13: failed to assign [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.2: BAR 13: no space for [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.2: BAR 13: failed to assign [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.1: BAR 13: no space for [io size 0x1000] [Wed Feb 8 10:20:49 2023] pcieport 0000:40:01.1: BAR 13: failed to assign [io size 0x1000] as already stated in the original bug report. how can I get rid of the now defunct nvme subsystem? anything else I could try? ** Bug watch added: github.com/linux-nvme/nvme-cli/issues #1707 https://github.com/linux-nvme/nvme-cli/issues/1707 ** Summary changed: - pcie hotplug not working in linux-generic-hwe-18.04 5.4.0.107.121~18 + pcie hotplug not working in linux-generic-hwe-18.04 5.4.0.135.152~18 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1998224 Title: pcie hotplug not working in linux-generic-hwe-18.04 5.4.0.135.152~18 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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