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Add a read-only sysfs file to display the security state of a device (currently only pmem): /sys/bus/cxl/devices/memX/security/state This introduces a cxl_security_state structure that is to be the placeholder for common CXL security features. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Fan Ni <fan.ni@samsung.com> Signed-off-by: Davidlohr Bueso <dave@stgolabs.net> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/20230612181038.14421-3-dave@stgolabs.net Signed-off-by: Dan Williams <dan.j.williams@intel.com>