[Linaro-mm-sig] Re: [PATCH v5 3/9] vfio/pci: Add a helper to look up PFNs for DMABUFs

From: Matt Evans matt@ozlabs.org Sent: Thursday, July 16, 2026 1:47 AM

Add vfio_pci_dma_buf_find_pfn(), which a VMA fault handler can use to find a PFN.

This supports multi-range DMABUFs, which typically would be used to represent scattered spans but might even represent overlapping or aliasing spans of PFNs.

Because this is intended to be used in vfio_pci_core.c, we also need to expose the struct vfio_pci_dma_buf in the vfio_pci_priv.h header.

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

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