I have a SK hynix PE4010 (HFS960GD0TEG-6410A, 894G) installed on a PCIe splitter card on an ASRock B450M Pro4-F. The splitter card has no switch chip; it relies on the motherboard's PCIe bifurcation.
After updating from 7.0.2 to 7.0.14-8, PVE got stuck during boot because it couldn't detect my disk. The NVMe controller is simply not visible, and I couldn't confirm any error in dmesg (in that state I wasn't able to export the log).
After some testing, I found that 7.0.14-6 is the latest kernel I can run.
From here it's out of my depth, so I relied heavily on AI tooling for the debugging — please bear with me. I had the AI filter the PCI-related patches between 7.0.14-6 and 7.0.14-7 to find which one caused this. It traced it to commit 72780f796468, and the reasoning is: the commit removed the ASM2824 whitelist and the link-up check, so the kernel now unconditionally lifts the firmware's 2.5 GT/s speed clamp and retrains the port to 8 GT/s during enumeration. On this link, Gen3 equalization never completes, so 8 GT/s is unreliable and the NVMe disappears.
To verify, I rebuilt 7.0.14-8 with a revert patch for that commit, reinstalled it, and it works now.
Attachments: pvereport, full lspci -vvv, dmesg of the reverted kernel, and the revert patch.
After updating from 7.0.2 to 7.0.14-8, PVE got stuck during boot because it couldn't detect my disk. The NVMe controller is simply not visible, and I couldn't confirm any error in dmesg (in that state I wasn't able to export the log).
After some testing, I found that 7.0.14-6 is the latest kernel I can run.
From here it's out of my depth, so I relied heavily on AI tooling for the debugging — please bear with me. I had the AI filter the PCI-related patches between 7.0.14-6 and 7.0.14-7 to find which one caused this. It traced it to commit 72780f796468, and the reasoning is: the commit removed the ASM2824 whitelist and the link-up check, so the kernel now unconditionally lifts the firmware's 2.5 GT/s speed clamp and retrains the port to 8 GT/s during enumeration. On this link, Gen3 equalization never completes, so 8 GT/s is unreliable and the NVMe disappears.
To verify, I rebuilt 7.0.14-8 with a revert patch for that commit, reinstalled it, and it works now.
Attachments: pvereport, full lspci -vvv, dmesg of the reverted kernel, and the revert patch.
