[Linaro-mm-sig] Re: [PATCH v3 5/9] vfio/pci: Provide a user-facing name for BAR mappings

From: Matt Evans matt@ozlabs.org Sent: Wednesday, June 10, 2026 11:43 PM

Since converting BAR mmap()s to using DMABUFs, we lose the original device path in /proc/<pid>/maps, lsof, etc. Generate a debug-oriented synthetic 'filename' based on the cdev, plus BDF, plus resource index.

This applies only to BAR mappings via the VFIO device fd, as explicitly-exported DMABUFs are named by userspace via the DMA_BUF_SET_NAME ioctl.

Signed-off-by: Matt Evans matt@ozlabs.org

Reviewed-by: Kevin Tian kevin.tian@intel.com