Compiled linux-hwe-6.14 with the added patch, and it solves the issue.
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https://bugs.launchpad.net/bugs/2118821
Title:
qemu passthrough of devices without power management fails
Status in linux-hwe-6.14 package in Ubuntu:
New
Bug description:
After upgrade from 6.11 to 6.14 passthrough of Mellanox Virtual
Functions to QEMU VMs broke with error:
QEMU unexpectedly closed the monitor (vm='VM1'): 2025-07-25T21:33:08.658485Z
qemu-system-x86_64: -device
{"driver":"vfio-pci","host":"0000:82:00.1","id":"hostdev0","bus":"pci.9","addr":"0x0"}:
vfio 0000:82:00.1: error getting device from group 82: Permission denied
Verify all devices in group 82 are bound to vfio-<bus> or pci-stub and not
already in use
Passthrough of other devices works.
A thread on proxmox forums hints that it might be a regression when doing
passthrough of devices without power management:
https://forum.proxmox.com/threads/kernel-6-8-12-12-pve-update-results-in-vfio-pci-passthrough-issues.168519/
Patch posted at:
https://lore.proxmox.com/pve-devel/[email protected]/
I have not verified that the patch solves the issue in my case
though,but might have time to do that today.
# lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04
# apt-cache policy linux-image-generic-hwe-24.04
linux-image-generic-hwe-24.04:
Installed: 6.14.0-24.24~24.04.3
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