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Thu, 2 Apr 2026 22:15:51 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C93F158067; Thu, 2 Apr 2026 22:15:49 +0000 (GMT) Received: from fedora-workstation.ibmuc.com (unknown [9.61.183.185]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 2 Apr 2026 22:15:49 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=zLaXfFHkTh/EqgQgc 5A7NmqeYVrNl3izrBPbA19PmY0=; b=VLwObbf9db6wxZbKJvxSKz2pAWnVUfH7G KzOZVVm93n82oFHjDnRkloRMldsnItHjLYhizNLOLq6TUTlaHn7i/vxL2/HC4B4M 8zYqHCzLkDzZ3B55szqJTKl5yDnEl54AAqiG1JP4zYuQNtSW0RtsReXlmDAQl6qZ o306PA05mRJiB53jUJqhVtTxNYFH94bxcEd1+9jRnlD3WH5UqTGkpdxcrP/V5nLL AaRoLYlfh7mlN+nlwyabzdi8HftGBajtIJq43dKEHH+Wd1ipClBxEEN2FdQ2yy8T Wa1J5CQG0fyGLngpit/P8jP9Ou8+HbI49ugeVK7pLw3BVdRR5L+xg== From: Zhuoying Cai To: qemu-s390x@nongnu.org, qemu-devel@nongnu.org Cc: jrossi@linux.ibm.com, cohuck@redhat.com, berrange@redhat.com, richard.henderson@linaro.org, pierrick.bouvier@linaro.org, david@kernel.org, walling@linux.ibm.com, jjherne@linux.ibm.com, pasic@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com, mjrosato@linux.ibm.com, iii@linux.ibm.com, eblake@redhat.com, armbru@redhat.com, zycai@linux.ibm.com, alifm@linux.ibm.com, brueckner@linux.ibm.com, jdaley@linux.ibm.com Subject: [PATCH v10 29/30] docs/specs: Add secure IPL documentation Date: Thu, 2 Apr 2026 18:14:51 -0400 Message-ID: <20260402221453.1602899-30-zycai@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260402221453.1602899-1-zycai@linux.ibm.com> References: <20260402221453.1602899-1-zycai@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDE5NSBTYWx0ZWRfX68XZOKRdm5c6 lFZrKWHcjzVNvlOZEtYtQFmcEg9NnE784zd5LRQzT7Q8etwQe3EI+dgEja28DfYnoarT5a3srwq mhQjLmo660VV2/2zQoX0IDKhstJ7cXWT8HxrSKgb3f8SM3WITAkMMviNoKd5RHDYpPYZQhX7Uyx gpfFpJVvUQriGL+X7eBbm1HKUcz1HWjX/kAB+2VjSGg6nxCuVit41TLhaE2YlJLYU0h9OiysLQ1 cASIksEb5R8eSKyq72xf/l1pm1kp/4allKfy5x6iXDK7mLS4HBcG86IGLrr7rt+N+WvC4Z9L2Qb D2obWx16mca52+ngH0RZg2QVwzvZ4y9ILcua3h/lmjBo3A5rQB5tMw/bky1eV3ZqVEcRS+a7+3s zotTIS1RzDKqbQbarZfMcn/UDn411ogPdyFmi1Ytp/PQ2zuaBIpGziMslGfoRIMw6hb89ntepJW XqPvtc7onZIfIIVUjqA== X-Authority-Analysis: v=2.4 cv=QKZlhwLL c=1 sm=1 tr=0 ts=69ceea99 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=XijvyHP8Q_8UnoOVIU8A:9 X-Proofpoint-GUID: WAunIMczYav0MmDTI-2DKQkNlNUtDdYc X-Proofpoint-ORIG-GUID: WAunIMczYav0MmDTI-2DKQkNlNUtDdYc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-02_04,2026-04-02_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 adultscore=0 impostorscore=0 clxscore=1015 spamscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020195 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Add documentation for secure IPL Signed-off-by: Collin Walling --- docs/specs/s390x-secure-ipl.rst | 55 +++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/docs/specs/s390x-secure-ipl.rst b/docs/specs/s390x-secure-ipl.= rst index 756246c45a..2ba54ecc1d 100644 --- a/docs/specs/s390x-secure-ipl.rst +++ b/docs/specs/s390x-secure-ipl.rst @@ -1,5 +1,60 @@ .. SPDX-License-Identifier: GPL-2.0-or-later =20 +s390 Secure IPL +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Secure IPL (a.k.a. secure boot) enables s390-ccw virtual machines to +leverage qcrypto libraries and z/Architecture emulations to verify the +integrity of signed kernels. The qcrypto libraries are used to perform +certificate validation and signature-verification, whereas the +z/Architecture emulations are used to ensure secure IPL data has not +been tampered with, convey data between QEMU and guest code, and set up +the relevant secure IPL data structures with verification results. + +To find out more about using this feature, see +``docs/system/s390x/secure-ipl.rst``. + +Note that "guest code" will refer to the s390-ccw BIOS unless stated +otherwise. + +Both QEMU and guest code work in cooperation to perform secure IPL. The Se= cure +Loading Attributes Facility (SCLAF) is used to check the Secure Code +Loading Attribute Block (SCLAB) and ensure that secure IPL data has not +been tampered with. DIAGNOSE 'X'320' is invoked by guest code to query +the certificate store info and retrieve specific certificates from QEMU. +DIAGNOSE 'X'508' is used by guest code to leverage qcrypto libraries to +perform signature-verification in QEMU. Lastly, guest code generates and +appends an IPL Information Report Block (IIRB) at the end of the IPL +Parameter Block, which is used by the kernel to store signed and +verified entries. + +The logical steps are as follows: + +- guest code reads data payload from disk (e.g. stage3 boot loader, kernel) +- guest code checks the validity of the SCLAB +- guest code invokes DIAG 508 subcode 1 and provides it the payload +- QEMU handles DIAG 508 request by reading the payload and retrieving the + certificate store +- QEMU DIAG 508 utilizes qcrypto libraries to perform signature-verificati= on on + the payload, attempting with each cert in the store (until success or + exhausted) +- QEMU DIAG 508 returns: + + - success: index of cert used to verify payload + - failure: error code + +- guest code responds to this operation: + + - success: retrieves cert from store via DIAG 320 using returned index + - failure: reports with warning (audit mode), aborts with error (secure = mode) + +- guest code appends IIRB at the end of the IPLB +- guest code kicks off IPL + +More information regarding the respective DIAGNOSE commands and IPL data +structures are outlined within this document. + + s390 Certificate Store and Functions =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 --=20 2.53.0