From ed106d7f28d95d48d1b6cae10e4fa3325a86472d Mon Sep 17 00:00:00 2001
From: Steffen Maier <maier@linux.ibm.com>
Date: Thu, 31 Aug 2023 17:03:17 +0200
Subject: [PATCH] zdev/dracut: add site support for early devices to the kdump
 case
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The existing code can already determine the required devices for the
actively running system, but this does not work for execution environments
in different (disaster recovery) sites.

Kdump likely does not notice when running in a different site and does not
re-generate the kdump initrd (because the kdump config itself does not
change).

The new code allows users to explicitly specify devices required for early
boot in initrd on different sites. Assuming this is a small number of
devices and could even overlap between the root-fs and the kdump case, do
not further distinguish those two sets of devices, but simply use the same
marker attribute "zdev:early=1" for both cases. With all this site
information available at the (initial) kdump initrd generation, the
resulting kdump initrd can work on any site without having to re-generate.

Complements commit 3c7adcc3c81d ("zdev: dracut: modifiy the
module-setup.sh").

Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158
Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
---
 zdev/dracut/95zdev-kdump/module-setup.sh | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/zdev/dracut/95zdev-kdump/module-setup.sh b/zdev/dracut/95zdev-kdump/module-setup.sh
index 27fb9d75..7f9a6451 100755
--- a/zdev/dracut/95zdev-kdump/module-setup.sh
+++ b/zdev/dracut/95zdev-kdump/module-setup.sh
@@ -86,12 +86,27 @@ install() {
     chzdev --export - --persistent --by-attrib "zdev:early=1" --quiet \
            --type 2>/dev/null >> "$_tempfile"
 
+    # site support
+    # Obtain early device configuration for site-specific settings
+    for (( site=0; site<10; site++ ))
+    do
+    chzdev --export - --persistent --by-attrib "zdev:early=1" --site $site \
+           --quiet 2>/dev/null >> "$_tempfile"
+    done
+
     ddebug < "$_tempfile"
 
     # Apply via --import to prevent other devices from being configured
     chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
            --yes --no-root-update --force 2>&1 | ddebug
 
+    # Apply site-specific configurations via --import
+    for (( site=0; site<10; site++ ))
+    do
+    chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
+           --site $site --yes --no-root-update --force 2>&1 | ddebug
+    done
+
     lszdev --configured --persistent --info \
            --base "/etc=$initdir/etc" 2>&1 | ddebug