[PATCH v4 14/27] vfio: Add CXL region type for the HDM region
| Newsgroups | org.kernel.vger.linux-cxl,org.kernel.vger.kvm,org.kernel.vger.linux-doc,org.kernel.vger.linux-hardening,org.kernel.vger.linux-kernel,org.kernel.vger.linux-kselftest,org.kernel.vger.linux-pci |
|---|---|
| Message-ID | <[email protected]> |
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. * -- 2.25.1