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

On Thu, Apr 16, 2026 at 06:17:48AM -0700, Matt Evans wrote:

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 mattev@meta.com

drivers/vfio/pci/vfio_pci_dmabuf.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe jgg@nvidia.com

Jason