From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AAB39EA4E3D for ; Mon, 2 Mar 2026 16:25:18 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vx64M-0003ev-Bx; Mon, 02 Mar 2026 11:24:30 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vx64J-0003eE-Im for qemu-devel@nongnu.org; Mon, 02 Mar 2026 11:24:27 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vx64H-00085X-5H for qemu-devel@nongnu.org; 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Mon, 2 Mar 2026 16:24:16 +0000 (UTC) Received: from [10.45.224.162] (unknown [10.45.224.162]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D09643000225; Mon, 2 Mar 2026 16:24:09 +0000 (UTC) Message-ID: <868c7c98-d126-4d43-9b23-51ee581ecce2@redhat.com> Date: Mon, 2 Mar 2026 17:24:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 30/30] docs/system/s390x: Add secure IPL documentation To: Zhuoying Cai , berrange@redhat.com, richard.henderson@linaro.org, jrossi@linux.ibm.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org Cc: 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, alifm@linux.ibm.com, brueckner@linux.ibm.com References: <20260212204352.1044699-1-zycai@linux.ibm.com> <20260212204352.1044699-31-zycai@linux.ibm.com> From: Thomas Huth Content-Language: en-US Autocrypt: addr=thuth@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 27 X-Spam_score: 2.7 X-Spam_bar: ++ X-Spam_report: (2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.968, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.495, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 12/02/2026 21.43, Zhuoying Cai wrote: > Add documentation for secure IPL > > Signed-off-by: Collin Walling > Signed-off-by: Zhuoying Cai > --- > docs/system/s390x/secure-ipl.rst | 96 ++++++++++++++++++++++++++++++++ > 1 file changed, 96 insertions(+) > > diff --git a/docs/system/s390x/secure-ipl.rst b/docs/system/s390x/secure-ipl.rst > index e0af086c38..275aa422c7 100644 > --- a/docs/system/s390x/secure-ipl.rst > +++ b/docs/system/s390x/secure-ipl.rst > @@ -1,5 +1,21 @@ > .. SPDX-License-Identifier: GPL-2.0-or-later > > +s390 Secure IPL > +=============== > + > +Secure IPL, also known as secure boot, enables s390-ccw virtual machines to > +verify the integrity of guest kernels. > + > +For technical details of this feature, see ``docs/specs/s390x-secure-ipl.rst``. > + > +This document explains how to use secure IPL with s390x in QEMU. It covers > +new command line options for providing certificates and enabling secure IPL, s/new/the/ ... the command line options are new right now, but in a couple of months, this won't be true anymore. > +the different IPL modes (Normal, Audit, and Secure), and system requirements. > + > +A quickstart guide is provided to demonstrate how to generate certificates, > +sign images, and start a guest in Secure Mode. > + > + > Secure IPL Command Line Options > =============================== > > @@ -78,3 +94,83 @@ Configuration: > .. code-block:: shell > > qemu-system-s390x -machine s390-ccw-virtio,secure-boot=on,boot-certs.0.path=/.../qemu/certs,boot-certs.1.path=/another/path/cert.pem ... > + > + > +Constraints > +=========== > + > +The following constraints apply when attempting to secure IPL an s390 guest: "when attempting to boot an s390x guest in secure mode". Otherwise it sounds like "to secure" is the verb. > +- z16 or "qemu" CPU model > +- certificates must be in X.509 PEM format > +- only support for SCSI scheme of virtio-blk/virtio-scsi devices > +- a boot device must be specified > +- any unsupported devices (e.g., ECKD and VFIO) or non-eligible devices (e.g., > + network) will cause the entire boot process terminating early with an error > + logged to the console. > + > + > +Secure IPL Quickstart > +===================== > + > +Build QEMU with gnutls enabled > +------------------------------- > + > +.. code-block:: shell > + > + ./configure … --enable-gnutls > + > +Generate certificate (e.g. via certtool) > +---------------------------------------- > + > +A private key is required before generating a certificate. This key must be kept > +secure and confidential. > + > +Use an RSA private key for signing. > + > +.. code-block:: shell > + > + certtool --generate-privkey > key.pem > + > +A self-signed certificate requires the organization name. Use the ``cert.info`` > +template to pre-fill values and avoid interactive prompts from certtool. > + > +.. code-block:: shell > + > + cat > cert.info < + cn = "My Name" > + expiration_days = 36500 > + cert_signing_key > + EOF > + > + certtool --generate-self-signed \ > + --load-privkey key.pem \ > + --template cert.info \ > + --hash=SHA256 \ > + --outfile cert.pem > + > +Sign Images (e.g. via sign-file) > +-------------------------------- > + > +- signing must be performed on a KVM guest filesystem I'd remove the "KVM" in above sentence. It is also supposed to work with TCG, isn't it? Thomas