Hello,
I'm trying to use the QEMU NVMe userspace driver and I'm hitting an error when
trying to use more than one device from an IOMMU group:
Failed to open VFIO group file: /dev/vfio/39: Device or resource busy
If devices belong to different IOMMU groups, then it works as expected.
For each device, I bind it to vfio-pci and then use something like this:
-drive file=nvme://0000:26:00.0,if=none,id=drive0,format=raw
-device virtio-blk,drive=drive0,id=virtio0,serial=nvme0
Using the file-based protocol (file=/dev/nvme0n1) works with multiple devices
from the same group.
My host is running a 5.19 kernel and QEMU is the latest upstream (a8cc5842b5cb).
Thanks,
Martin
