On Thu, 13 Aug 2026 15:06:18 +0530 <[email protected]> wrote: > From: Manish Honap <[email protected]> > > A CXL Type-2 device exposes its HDM memory to the guest as a dedicated > VFIO region rather than a PCI BAR. Add a CXL region type and a memory > sub-type for it; vfio-cxl registers the window under these so userspace > can discover and map it. > > Signed-off-by: Manish Honap <[email protected]> > --- > include/uapi/linux/vfio.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h > index 5de618a3a5ee..540e62312671 100644 > --- a/include/uapi/linux/vfio.h > +++ b/include/uapi/linux/vfio.h > @@ -345,6 +345,7 @@ struct vfio_region_info_cap_type { > #define VFIO_REGION_TYPE_GFX (1) > #define VFIO_REGION_TYPE_CCW (2) > #define VFIO_REGION_TYPE_MIGRATION_DEPRECATED (3) > +#define VFIO_REGION_TYPE_CXL (4) > > /* sub-types for VFIO_REGION_TYPE_PCI_* */ > > @@ -373,6 +374,10 @@ struct vfio_region_info_cap_type { > /* sub-types for VFIO_REGION_TYPE_GFX */ > #define VFIO_REGION_SUBTYPE_GFX_EDID (1) > > +/* sub-types for VFIO_REGION_TYPE_CXL */ > +/* CXL.mem HDM region of a Type-2 device, mmap-able */ > +#define VFIO_REGION_SUBTYPE_CXL_MEM (1) > + > /** > * struct vfio_region_gfx_edid - EDID region layout. > *
CXL has a PCI vendor ID, it's even used in the dvsec capability. Why not use a PCI vendor type region? Thanks, Alex
