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1.. SPDX-License-Identifier: GPL-2.02 3Intel(R) Active Management Technology (Intel AMT)4=================================================5 6Prominent usage of the Intel ME Interface is to communicate with Intel(R)7Active Management Technology (Intel AMT) implemented in firmware running on8the Intel ME.9 10Intel AMT provides the ability to manage a host remotely out-of-band (OOB)11even when the operating system running on the host processor has crashed or12is in a sleep state.13 14Some examples of Intel AMT usage are:15 - Monitoring hardware state and platform components16 - Remote power off/on (useful for green computing or overnight IT17 maintenance)18 - OS updates19 - Storage of useful platform information such as software assets20 - Built-in hardware KVM21 - Selective network isolation of Ethernet and IP protocol flows based22 on policies set by a remote management console23 - IDE device redirection from remote management console24 25Intel AMT (OOB) communication is based on SOAP (deprecated26starting with Release 6.0) over HTTP/S or WS-Management protocol over27HTTP/S that are received from a remote management console application.28 29For more information about Intel AMT:30https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm31 32 33Intel AMT Applications34----------------------35 36 1) Intel Local Management Service (Intel LMS)37 38 Applications running locally on the platform communicate with Intel AMT Release39 2.0 and later releases in the same way that network applications do via SOAP40 over HTTP (deprecated starting with Release 6.0) or with WS-Management over41 SOAP over HTTP. This means that some Intel AMT features can be accessed from a42 local application using the same network interface as a remote application43 communicating with Intel AMT over the network.44 45 When a local application sends a message addressed to the local Intel AMT host46 name, the Intel LMS, which listens for traffic directed to the host name,47 intercepts the message and routes it to the Intel MEI.48 For more information:49 https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm50 Under "About Intel AMT" => "Local Access"51 52 For downloading Intel LMS:53 https://github.com/intel/lms54 55 The Intel LMS opens a connection using the Intel MEI driver to the Intel LMS56 firmware feature using a defined GUID and then communicates with the feature57 using a protocol called Intel AMT Port Forwarding Protocol (Intel APF protocol).58 The protocol is used to maintain multiple sessions with Intel AMT from a59 single application.60 61 See the protocol specification in the Intel AMT Software Development Kit (SDK)62 https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm63 Under "SDK Resources" => "Intel(R) vPro(TM) Gateway (MPS)"64 => "Information for Intel(R) vPro(TM) Gateway Developers"65 => "Description of the Intel AMT Port Forwarding (APF) Protocol"66 67 2) Intel AMT Remote configuration using a Local Agent68 69 A Local Agent enables IT personnel to configure Intel AMT out-of-the-box70 without requiring installing additional data to enable setup. The remote71 configuration process may involve an ISV-developed remote configuration72 agent that runs on the host.73 For more information:74 https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm75 Under "Setup and Configuration of Intel AMT" =>76 "SDK Tools Supporting Setup and Configuration" =>77 "Using the Local Agent Sample"78 79Intel AMT OS Health Watchdog80----------------------------81 82The Intel AMT Watchdog is an OS Health (Hang/Crash) watchdog.83Whenever the OS hangs or crashes, Intel AMT will send an event84to any subscriber to this event. This mechanism means that85IT knows when a platform crashes even when there is a hard failure on the host.86 87The Intel AMT Watchdog is composed of two parts:88 1) Firmware feature - receives the heartbeats89 and sends an event when the heartbeats stop.90 2) Intel MEI iAMT watchdog driver - connects to the watchdog feature,91 configures the watchdog and sends the heartbeats.92 93The Intel iAMT watchdog MEI driver uses the kernel watchdog API to configure94the Intel AMT Watchdog and to send heartbeats to it. The default timeout of the95watchdog is 120 seconds.96 97If the Intel AMT is not enabled in the firmware then the watchdog client won't enumerate98on the me client bus and watchdog devices won't be exposed.99 100---101linux-mei@linux.intel.com102