On Thu, Mar 12, 2026 at 11:46:07AM -0700, Matt Evans wrote:

A new field is reserved in vfio_device_feature_dma_buf.flags to request CPU-facing memory type attributes for mmap()s of the buffer. Add a flag VFIO_DEVICE_FEATURE_DMA_BUF_ATTR_WC, which results in WC PTEs for the DMABUF's BAR region.

This seems very straightforward, I like it

Did I get it right that the idea is the user would request a dmabuf with these flags and then mmap the dmabuf?

Jason