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Tue, 8 Oct 2024 01:16:20 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A9F7A58055; Tue, 8 Oct 2024 01:16:19 +0000 (GMT) Received: from localhost.localdomain (unknown [9.61.51.58]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Tue, 8 Oct 2024 01:16:19 +0000 (GMT) From: jrossi@linux.ibm.com To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org, thuth@redhat.com Cc: frankja@linux.ibm.com, jrossi@linux.ibm.com Subject: [PATCH v3 18/19] docs/system: Update documentation for s390x IPL Date: Mon, 7 Oct 2024 21:15:51 -0400 Message-ID: <20241008011552.2645520-19-jrossi@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241008011552.2645520-1-jrossi@linux.ibm.com> References: <20241008011552.2645520-1-jrossi@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: -uNYwC_waoNLXv66RvApjIu-ukA9TllH X-Proofpoint-GUID: NBP6MlgOsOiYyGrsSHhAmaIWt8UCo5Ol X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-07_16,2024-10-07_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 bulkscore=0 clxscore=1015 spamscore=0 mlxscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 suspectscore=0 mlxlogscore=756 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410080003 Received-SPF: pass client-ip=148.163.158.5; envelope-from=jrossi@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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 From: Jared Rossi Update docs to show that s390x PC BIOS can support more than one boot device. Signed-off-by: Jared Rossi Reviewed-by: Thomas Huth --- docs/system/bootindex.rst | 7 ++++--- docs/system/s390x/bootdevices.rst | 9 ++++++--- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/docs/system/bootindex.rst b/docs/system/bootindex.rst index 8b057f812f..988f7b3beb 100644 --- a/docs/system/bootindex.rst +++ b/docs/system/bootindex.rst @@ -49,10 +49,11 @@ Limitations ----------- Some firmware has limitations on which devices can be considered for -booting. For instance, the PC BIOS boot specification allows only one -disk to be bootable. If boot from disk fails for some reason, the BIOS +booting. For instance, the x86 PC BIOS boot specification allows only one +disk to be bootable. If boot from disk fails for some reason, the x86 BIOS won't retry booting from other disk. It can still try to boot from -floppy or net, though. +floppy or net, though. In the case of s390x BIOS, the BIOS will try up to +8 total devices, any number of which may be disks. Sometimes, firmware cannot map the device path QEMU wants firmware to boot from to a boot method. It doesn't happen for devices the firmware diff --git a/docs/system/s390x/bootdevices.rst b/docs/system/s390x/bootdevices.rst index c97efb8fc0..1a1a764c1c 100644 --- a/docs/system/s390x/bootdevices.rst +++ b/docs/system/s390x/bootdevices.rst @@ -6,9 +6,7 @@ Booting with bootindex parameter For classical mainframe guests (i.e. LPAR or z/VM installations), you always have to explicitly specify the disk where you want to boot from (or "IPL" from, -in s390x-speak -- IPL means "Initial Program Load"). In particular, there can -also be only one boot device according to the architecture specification, thus -specifying multiple boot devices is not possible (yet). +in s390x-speak -- IPL means "Initial Program Load"). So for booting an s390x guest in QEMU, you should always mark the device where you want to boot from with the ``bootindex`` property, for @@ -17,6 +15,11 @@ example:: qemu-system-s390x -drive if=none,id=dr1,file=guest.qcow2 \ -device virtio-blk,drive=dr1,bootindex=1 +Multiple devices may have a bootindex. The lowest bootindex is assigned to the +device to IPL first. If the IPL fails for the first, the device with the second +lowest bootindex will be tried and so on until IPL is successful or there are no +remaining boot devices to try. + For booting from a CD-ROM ISO image (which needs to include El-Torito boot information in order to be bootable), it is recommended to specify a ``scsi-cd`` device, for example like this::