Re: [RFC 1/2] Vfio: add callback to get tph info for dmabuf
From: Keith Busch <kbusch@kernel.org>
Date: 2026-02-27 00:56:14
Also in:
dri-devel, linux-pci, linux-rdma
The subject prefix should be lower case "vfio" to match the subsystem commit style. On Tue, Feb 10, 2026 at 11:39:54AM -0800, Zhiping Zhang wrote:
quoted hunk
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index ac2329f24141..bff2f5f7e38d 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h@@ -1501,6 +1501,8 @@ struct vfio_region_dma_range { struct vfio_device_feature_dma_buf { __u32 region_index; __u32 open_flags; + __u16 steering_tag; + __u8 ph; __u32 flags; __u32 nr_ranges; struct vfio_region_dma_range dma_ranges[] __counted_by(nr_ranges);
I don't think you can add fields to a uapi struct like this since it breaks comptibility. Instead, I think you may be able to carve it out of the "flags" field since it's currently reserved to be 0, so I guess it's potentially available to define a new feature.