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SPDX-License-Identifier: GPL-2.0-or-later\n \n+s390 Secure IPL\n+===============\n+\n+Secure IPL (a.k.a. secure boot) enables s390-ccw virtual machines to\n+leverage qcrypto libraries and z/Architecture emulations to verify the\n+integrity of signed kernels. The qcrypto libraries are used to perform\n+certificate validation and signature-verification, whereas the\n+z/Architecture emulations are used to ensure secure IPL data has not\n+been tampered with, convey data between QEMU and guest code, and set up\n+the relevant secure IPL data structures with verification results.\n+\n+To find out more about using this feature, see\n+``docs/system/s390x/secure-ipl.rst``.\n+\n+Note that \"guest code\" will refer to the s390-ccw BIOS unless stated\n+otherwise.\n+\n+Both QEMU and guest code work in cooperation to perform secure IPL. The Secure\n+Loading Attributes Facility (SCLAF) is used to check the Secure Code\n+Loading Attribute Block (SCLAB) and ensure that secure IPL data has not\n+been tampered with. DIAGNOSE 'X'320' is invoked by guest code to query\n+the certificate store info and retrieve specific certificates from QEMU.\n+DIAGNOSE 'X'508' is used by guest code to leverage qcrypto libraries to\n+perform signature-verification in QEMU. Lastly, guest code generates and\n+appends an IPL Information Report Block (IIRB) at the end of the IPL\n+Parameter Block, which is used by the kernel to store signed and\n+verified entries.\n+\n+The logical steps are as follows:\n+\n+- guest code reads data payload from disk (e.g. stage3 boot loader, kernel)\n+- guest code checks the validity of the SCLAB\n+- guest code invokes DIAG 508 subcode 1 and provides it the payload\n+- QEMU handles DIAG 508 request by reading the payload and retrieving the\n+ certificate store\n+- QEMU DIAG 508 utilizes qcrypto libraries to perform signature-verification on\n+ the payload, attempting with each cert in the store (until success or\n+ exhausted)\n+- QEMU DIAG 508 returns:\n+\n+ - success: index of cert used to verify payload\n+ - failure: error code\n+\n+- guest code responds to this operation:\n+\n+ - success: retrieves cert from store via DIAG 320 using returned index\n+ - failure: reports with warning (audit mode), aborts with error (secure mode)\n+\n+- guest code appends IIRB at the end of the IPLB\n+- guest code kicks off IPL\n+\n+More information regarding the respective DIAGNOSE commands and IPL data\n+structures are outlined within this document.\n+\n+\n s390 Certificate Store and Functions\n ====================================\n \n","prefixes":["v10","29/30"]}