I’ve upgraded from Lubuntu 18.10 to Kubuntu 19.10 for my work-gaming combo PC and now the VM with PCI passthrough is very unstable, compared to how it was in 18.10.
The kernel driver in use is vfio-pci,
user@user-MS-7B44:/mnt/raid/QEMU$ lspci -nnv
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP104 [GeForce GTX 1070 Ti] [10de:1b82] (rev a1) (prog-if 00 [VGA controller])
Subsystem: CardExpert Technology GP104 [GeForce GTX 1070 Ti] [10b0:1b82]
Flags: fast devsel, IRQ 10
Memory at de000000 (32-bit, non-prefetchable) [disabled] [size=16M]
Memory at c0000000 (64-bit, prefetchable) [disabled] [size=256M]
Memory at d0000000 (64-bit, prefetchable) [disabled] [size=32M]
I/O ports at e000 [disabled] [size=128]
Expansion ROM at df000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: vfio-pci
Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
but every 300 ms this is spammed in dmesg logs
user@user-MS-7B44:/mnt/raid/QEMU$ dnesg
[ 327.609906] nvidia-nvlink: Nvlink Core is being initialized, major device number 511
[ 327.610231] NVRM: The NVIDIA probe routine was not called for 1 device(s).
[ 327.610231] NVRM: This can occur when a driver such as:
NVRM: nouveau, rivafb, nvidiafb or rivatv
NVRM: was loaded and obtained ownership of the NVIDIA device(s).
[ 327.610231] NVRM: Try unloading the conflicting kernel module (and/or
NVRM: reconfigure your kernel without the conflicting
NVRM: driver(s)), then try loading the NVIDIA kernel module
NVRM: again.
[ 327.610232] NVRM: No NVIDIA devices probed.
[ 327.610424] nvidia-nvlink: Unregistered the Nvlink Core, major device number 511
which makes me think this might be why is unstable.
How do I stop it from probing the device?
I’ve tried to add
blacklist nouveau
options nouveau modeset=0
in /etc/modprobe.d/blacklist-nouveau.conf, but it has no effect.