|
 |
97168e |
From 407e23d7f0c9020404247afe7d4df98505222bbb Mon Sep 17 00:00:00 2001
|
|
|
97168e |
From: Thomas Huth <thuth@redhat.com>
|
|
|
97168e |
Date: Mon, 14 Nov 2022 14:25:02 +0100
|
|
|
97168e |
Subject: [PATCH 1/3] docs/system/s390x: Document the "loadparm" machine
|
|
|
97168e |
property
|
|
|
97168e |
MIME-Version: 1.0
|
|
|
97168e |
Content-Type: text/plain; charset=UTF-8
|
|
|
97168e |
Content-Transfer-Encoding: 8bit
|
|
|
97168e |
|
|
|
97168e |
RH-Author: Thomas Huth <thuth@redhat.com>
|
|
|
97168e |
RH-MergeRequest: 233: s390x: Document the "loadparm" machine property
|
|
|
97168e |
RH-Bugzilla: 2128225
|
|
|
97168e |
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
|
|
|
97168e |
RH-Acked-by: Cédric Le Goater <clg@redhat.com>
|
|
|
97168e |
RH-Acked-by: Jon Maloy <jmaloy@redhat.com>
|
|
|
97168e |
RH-Commit: [1/2] e9589ea32d2a8f82971476b644e1063fa14cf822
|
|
|
97168e |
|
|
|
97168e |
The "loadparm" machine property is useful for selecting alternative
|
|
|
97168e |
kernels on the disk of the guest, but so far we do not tell the users
|
|
|
97168e |
yet how to use it. Add some documentation to fill this gap.
|
|
|
97168e |
|
|
|
97168e |
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2128235
|
|
|
97168e |
Message-Id: <20221114132502.110213-1-thuth@redhat.com>
|
|
|
97168e |
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
|
|
|
97168e |
Signed-off-by: Thomas Huth <thuth@redhat.com>
|
|
|
97168e |
(cherry picked from commit be5df2edb5d69ff3107c5616aa035a9ba8d0422e)
|
|
|
97168e |
---
|
|
|
97168e |
docs/system/s390x/bootdevices.rst | 26 ++++++++++++++++++++++++++
|
|
|
97168e |
1 file changed, 26 insertions(+)
|
|
|
97168e |
|
|
|
97168e |
diff --git a/docs/system/s390x/bootdevices.rst b/docs/system/s390x/bootdevices.rst
|
|
|
97168e |
index 9e591cb9dc..d4bf3b9f0b 100644
|
|
|
97168e |
--- a/docs/system/s390x/bootdevices.rst
|
|
|
97168e |
+++ b/docs/system/s390x/bootdevices.rst
|
|
|
97168e |
@@ -53,6 +53,32 @@ recommended to specify a CD-ROM device via ``-device scsi-cd`` (as mentioned
|
|
|
97168e |
above) instead.
|
|
|
97168e |
|
|
|
97168e |
|
|
|
97168e |
+Selecting kernels with the ``loadparm`` property
|
|
|
97168e |
+------------------------------------------------
|
|
|
97168e |
+
|
|
|
97168e |
+The ``s390-ccw-virtio`` machine supports the so-called ``loadparm`` parameter
|
|
|
97168e |
+which can be used to select the kernel on the disk of the guest that the
|
|
|
97168e |
+s390-ccw bios should boot. When starting QEMU, it can be specified like this::
|
|
|
97168e |
+
|
|
|
97168e |
+ qemu-system-s390x -machine s390-ccw-virtio,loadparm=<string>
|
|
|
97168e |
+
|
|
|
97168e |
+The first way to use this parameter is to use the word ``PROMPT`` as the
|
|
|
97168e |
+``<string>`` here. In that case the s390-ccw bios will show a list of
|
|
|
97168e |
+installed kernels on the disk of the guest and ask the user to enter a number
|
|
|
97168e |
+to chose which kernel should be booted -- similar to what can be achieved by
|
|
|
97168e |
+specifying the ``-boot menu=on`` option when starting QEMU. Note that the menu
|
|
|
97168e |
+list will only show the names of the installed kernels when using a DASD-like
|
|
|
97168e |
+disk image with 4k byte sectors. On normal SCSI-style disks with 512-byte
|
|
|
97168e |
+sectors, there is not enough space for the zipl loader on the disk to store
|
|
|
97168e |
+the kernel names, so you only get a list without names here.
|
|
|
97168e |
+
|
|
|
97168e |
+The second way to use this parameter is to use a number in the range from 0
|
|
|
97168e |
+to 31. The numbers that can be used here correspond to the numbers that are
|
|
|
97168e |
+shown when using the ``PROMPT`` option, and the s390-ccw bios will then try
|
|
|
97168e |
+to automatically boot the kernel that is associated with the given number.
|
|
|
97168e |
+Note that ``0`` can be used to boot the default entry.
|
|
|
97168e |
+
|
|
|
97168e |
+
|
|
|
97168e |
Booting from a network device
|
|
|
97168e |
-----------------------------
|
|
|
97168e |
|
|
|
97168e |
--
|
|
|
97168e |
2.37.3
|
|
|
97168e |
|