1What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X 2Date: Feb 2022 3KernelVersion: 5.18 4Contact: "David E. Box" <david.e.box@linux.intel.com> 5Description: 6 This directory contains interface files for accessing Intel 7 Software Defined Silicon (SDSi) features on a CPU. X 8 represents the socket instance (though not the socket ID). 9 The socket ID is determined by reading the registers file 10 and decoding it per the specification. 11 12 Some files communicate with SDSi hardware through a mailbox. 13 Should the operation fail, one of the following error codes 14 may be returned: 15 16 ========== ===== 17 Error Code Cause 18 ========== ===== 19 EIO General mailbox failure. Log may indicate cause. 20 EBUSY Mailbox is owned by another agent. 21 EPERM SDSI capability is not enabled in hardware. 22 EPROTO Failure in mailbox protocol detected by driver. 23 See log for details. 24 EOVERFLOW For provision commands, the size of the data 25 exceeds what may be written. 26 ESPIPE Seeking is not allowed. 27 ETIMEDOUT Failure to complete mailbox transaction in time. 28 ========== ===== 29 30What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/guid 31Date: Feb 2022 32KernelVersion: 5.18 33Contact: "David E. Box" <david.e.box@linux.intel.com> 34Description: 35 (RO) The GUID for the registers file. The GUID identifies 36 the layout of the registers file in this directory. 37 Information about the register layouts for a particular GUID 38 is available at http://github.com/intel/intel-sdsi 39 40What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/registers 41Date: Feb 2022 42KernelVersion: 5.18 43Contact: "David E. Box" <david.e.box@linux.intel.com> 44Description: 45 (RO) Contains information needed by applications to provision 46 a CPU and monitor status information. The layout of this file 47 is determined by the GUID in this directory. Information about 48 the layout for a particular GUID is available at 49 http://github.com/intel/intel-sdsi 50 51What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/provision_akc 52Date: Feb 2022 53KernelVersion: 5.18 54Contact: "David E. Box" <david.e.box@linux.intel.com> 55Description: 56 (WO) Used to write an Authentication Key Certificate (AKC) to 57 the SDSi NVRAM for the CPU. The AKC is used to authenticate a 58 Capability Activation Payload. Mailbox command. 59 60What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/provision_cap 61Date: Feb 2022 62KernelVersion: 5.18 63Contact: "David E. Box" <david.e.box@linux.intel.com> 64Description: 65 (WO) Used to write a Capability Activation Payload (CAP) to the 66 SDSi NVRAM for the CPU. CAPs are used to activate a given CPU 67 feature. A CAP is validated by SDSi hardware using a previously 68 provisioned AKC file. Upon successful authentication, the CPU 69 configuration is updated. A cold reboot is required to fully 70 activate the feature. Mailbox command. 71 72What: /sys/bus/auxiliary/devices/intel_vsec.sdsi.X/state_certificate 73Date: Feb 2022 74KernelVersion: 5.18 75Contact: "David E. Box" <david.e.box@linux.intel.com> 76Description: 77 (RO) Used to read back the current State Certificate for the CPU 78 from SDSi hardware. The State Certificate contains information 79 about the current licenses on the CPU. Mailbox command. 80