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Coiby Xu 7d47251568 Iterate /sys/bus/ccwgroup/devices to tell if we should set up rd.znet 
This patch fixes bz1941106 and bz1941905 which passed empty rd.znet to the
kernel command line in the following cases,
 - The IBM (Z15) KVM guest uses virtio for all devices including network
   device, so there is no znet device for IBM KVM guest. So we can't
   assume a s390x machine always has a znet device.
 - When a bridged network is used, kexec-tools tries to obtain the znet
   configuration from the ifcfg script of the bridged network rather than
   from the ifcfg script of znet device.

We can iterate /sys/bus/ccwgroup/devices to tell if there if there is
a znet network device. By getting an ifname from znet, we can also avoid
mistaking the slave netdev as a znet network device in a bridged network
or bonded network.

Note: This patch also assumes there is only one znet device as commit
7148c0a30d ("add s390x netdev setup")
which greatly simplifies the code. According to IBM [1], there could be
more than znet devices for a z/VM system and a z/VM system may have a
non-znet network device like ConnectX. Since kdump_setup_znet was
introduced in 2012 and so far there is no known customer complaint that
invalidates this assumption I think it's safe to assume an IBM z/VM
system only has one znet device. Besides, there is no z/VM system found
on beaker to test the alternative scenarios.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1941905#c13

Signed-off-by: Coiby Xu <coxu@redhat.com>
Acked-by: Kairui Song <kasong@redhat.com>
2021-06-08 10:48:34 +08:00
tests selftest: replace qemu-kvm with one based on dracut's run-qemu 2021-03-24 15:51:02 +08:00
.gitignore .gitignore: Update to make it more generic 2016-05-16 10:15:01 +08:00
60-kdump.install Write to /var/lib/kdump if $KDUMP_BOOTDIR not writable 2021-04-19 16:11:17 +08:00
98-kexec.rules Make udev reload rules quiet during bootup 2018-12-06 17:44:03 +08:00
98-kexec.rules.ppc64 Stop reloading kdump service on CPU hotplug event for FADump 2021-03-10 16:24:42 +08:00
dracut-early-kdump-module-setup.sh module-setup.sh: don't polute the namespace unnecessarily 2021-01-20 14:14:08 +08:00
dracut-early-kdump.sh logger: source the logger file individually 2021-01-20 14:13:44 +08:00
dracut-kdump-capture.service dracut-kdump-capture.service: Use OnFailureJobMode instead of deprecated OnFailureIsolate 2019-06-14 09:44:09 +08:00
dracut-kdump-emergency.service Remove the kdump error handler isolation wrapper 2021-06-04 14:26:45 +08:00
dracut-kdump-emergency.target kdump-emergency: fix "Transaction is destructive" emergency failure 2017-03-31 11:54:30 +08:00
dracut-kdump-error-handler.sh Add failure_action as alias of default and make default obsolete 2019-01-22 17:57:53 +08:00
dracut-kdump.sh Fix incorrect vmcore permissions when dumped through ssh 2021-03-23 16:10:43 +08:00
dracut-module-setup.sh Iterate /sys/bus/ccwgroup/devices to tell if we should set up rd.znet 2021-06-08 10:48:34 +08:00
dracut-monitor_dd_progress monitor-dd-progress fix 2013-06-25 16:45:59 +08:00
early-kdump-howto.txt Improves the early-kdump-howto.txt document in several points: 2020-03-12 23:31:34 +08:00
fadump-howto.txt fadump: improve fadump-howto.txt about remote dump target setup 2021-02-23 16:18:54 +08:00
kdump-dep-generator.sh logger: source the logger file individually 2021-01-20 14:13:44 +08:00
kdump-in-cluster-environment.txt Add fence_kdump support for generic clusters 2014-04-03 14:43:06 +08:00
kdump-lib-initramfs.sh Use a customized emergency shell 2021-06-04 14:26:51 +08:00
kdump-lib.sh kdump-lib.sh: fix a warning in prepare_kdump_bootinfo() 2021-06-04 02:53:10 +08:00
kdump-logger.sh Capitalize the configuration name of log level 2020-11-13 02:49:35 +08:00
kdump-udev-throttler Make udev reload rules quiet during bootup 2018-12-06 17:44:03 +08:00
kdump.conf kdump.conf: add ipv6 example for nfs and ssh dump 2021-01-21 15:36:27 +08:00
kdump.conf.5 kdump.conf: Update doc about core_collector for ssh target 2021-01-12 16:12:32 +08:00
kdump.service kdump.service: use ConditionKernelCommandLine=crashkernel 2020-10-27 12:22:36 -04:00
kdump.sysconfig Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.aarch64 Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.i386 Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.ppc64 Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.ppc64le Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.s390x Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdump.sysconfig.x86_64 Disable CMA in kdump 2nd kernel 2021-05-13 17:13:39 +08:00
kdumpctl kdumpctl: Add kdumpctl estimate 2021-05-19 15:27:43 +08:00
kdumpctl.8 kdumpctl: Add kdumpctl estimate 2021-05-19 15:27:43 +08:00
kexec-kdump-howto.txt Doc: Improve the kdump sysconfig document 2021-01-12 16:46:44 +08:00
kexec-tools.spec Remove the kdump error handler isolation wrapper 2021-06-04 14:26:45 +08:00
live-image-kdump-howto.txt Revert "kdumpctl: filter 'root' kernel parameter when running in live images" 2017-04-11 16:03:12 +08:00
mkdumprd mkdumprd: make use of the new get_luks_crypt_dev helper 2021-05-19 15:27:37 +08:00
mkdumprd.8 Doc: improve mkdumprd man page 2020-12-11 14:05:08 +08:00
README README: Add a README file 2014-04-02 10:45:36 +08:00
sources Update makedumpfile to 1.6.9 2021-05-13 16:45:36 +08:00
zanata-notes.txt Add a notes for zanata process 2012-12-05 01:23:09 -05:00

README 

Adding a patch to kexec-tools
=============================
There is a mailing list kexec@lists.fedoraproject.org where all the dicussion
related to fedora kexec-tools happen. All the patches are posted there for
inclusion and committed to kexec-tools after review.

So if you want your patches to be included in fedora kexec-tools package,
post these to kexec@lists.fedoraproject.org.

One can subscribe to list and browse through archives here.

https://admin.fedoraproject.org/mailman/listinfo/kexec