vfio changes in 5.11?

[Idar Lund]

Hi,

Linux kernel 5.11.x (worked in 5.10.x)

When trying to unbind a USB host controller and add it to the vfio driver I'm getting a weird error message:

# echo '0000:06:00.0' > /sys/bus/pci/devices/0000\:06\:00.0/driver/unbind

# ls -laFh /sys/bus/pci/devices/0000\:06\:00.0/driver/unbind
ls: cannot access '/sys/bus/pci/devices/0000:06:00.0/driver/unbind': No such file or directory (as expected!)

# echo 0x1b73 0x1100 > /sys/bus/pci/drivers/vfio-pci/new_id
-bash: echo: write error: File exists

I've done some googling, but can't find any recent blog/forum posts about this. Anyone here know what this is about?

FYI; I've reported this to Fedora bugzilla; https://bugzilla.redhat.com/show_bug.cgi?id=1945565

-Idar