From: Manish Honap <[email protected]> Add CXL-specific state to vfio_pci_core_device structure to support CXL Type-2 device passthrough.
The new vfio_pci_cxl_state structure embeds CXL core objects: - struct cxl_dev_state: CXL device state (from CXL core) - struct cxl_memdev: CXL memory device - struct cxl_region: CXL region object - Root and endpoint decoders Key design point: The CXL state pointer is NULL for non-CXL devices, allowing vfio-pci-core to handle both CXL and standard PCI devices with minimal overhead. This will follow the approach where vfio-pci-core itself gains CXL awareness, rather than requiring a separate variant driver. Signed-off-by: Manish Honap <[email protected]> --- drivers/vfio/pci/cxl/vfio_cxl_priv.h | 28 ++++++++++++++++++++++++++++ include/linux/vfio_pci_core.h | 3 +++ 2 files changed, 31 insertions(+) create mode 100644 drivers/vfio/pci/cxl/vfio_cxl_priv.h diff --git a/drivers/vfio/pci/cxl/vfio_cxl_priv.h b/drivers/vfio/pci/cxl/vfio_cxl_priv.h new file mode 100644 index 000000000000..4cecc25db410 --- /dev/null +++ b/drivers/vfio/pci/cxl/vfio_cxl_priv.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Common infrastructure for CXL Type-2 device variant drivers + * + * Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved + */ + +#ifndef __LINUX_VFIO_CXL_PRIV_H +#define __LINUX_VFIO_CXL_PRIV_H + +#include <cxl/cxl.h> +#include <linux/types.h> + +/* CXL device state embedded in vfio_pci_core_device */ +struct vfio_pci_cxl_state { + struct cxl_dev_state cxlds; + struct cxl_memdev *cxlmd; + struct cxl_root_decoder *cxlrd; + struct cxl_endpoint_decoder *cxled; + resource_size_t hdm_reg_offset; + size_t hdm_reg_size; + resource_size_t comp_reg_offset; + size_t comp_reg_size; + u8 hdm_count; + u8 comp_reg_bar; +}; + +#endif /* __LINUX_VFIO_CXL_PRIV_H */ diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index 1ac86896875c..cd8ed98a82a3 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -30,6 +30,8 @@ struct vfio_pci_region; struct p2pdma_provider; struct dma_buf_phys_vec; struct dma_buf_attachment; +struct vfio_pci_cxl_state; + struct vfio_pci_eventfd { struct eventfd_ctx *ctx; @@ -138,6 +140,7 @@ struct vfio_pci_core_device { struct mutex ioeventfds_lock; struct list_head ioeventfds_list; struct vfio_pci_vf_token *vf_token; + struct vfio_pci_cxl_state *cxl; struct list_head sriov_pfs_item; struct vfio_pci_core_device *sriov_pf_core_dev; struct notifier_block nb; -- 2.25.1
