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

A new VFIO feature, VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR, is added to set CPU-facing memory type attributes for a DMABUF exported from vfio-pci. These are used for subsequent mmap()s of the buffer.

There are two attributes supported:

• The default, VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR_NC
• VFIO_DEVICE_FEATURE_DMA_BUF_MEMATTR_WC, which results in WC PTEs for the DMABUF's BAR region.

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

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