Patch merged. Thanks to Pingfan and Tao.

On Mon, Dec 20, 2021 at 10:11:24AM +0800, Tao Liu wrote:

Acked-by: Tao Liu ltao@redhat.com

On Mon, Dec 20, 2021 at 9:29 AM Pingfan Liu piliu@redhat.com wrote:

...

Onlining secondary cpus breaks kdump completely on KVM on Power hosts Though we use maxcpus=1 by default but 40-redhat.rules will bring up all possible cpus by default.

Thus before we get the kernel fix and the systemd rule fix let's remove the cpu rule in 40-redhat.rules for ppc64/ppc64le kdump initramfs.

This is back ported from RHEL, and original credit goes to Dave Young dyoung@redhat.com

Signed-off-by: Pingfan Liu piliu@redhat.com

dracut-module-setup.sh | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index 1ea0d95..c319fc2 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -1010,11 +1010,29 @@ kdump_install_systemd_conf() { echo "ForwardToConsole=yes" >> "${initdir}/etc/systemd/journald.conf.d/kdump.conf" }

+remove_cpu_online_rule() {

• local file=${initdir}/usr/lib/udev/rules.d/40-redhat.rules
• sed -i '/SUBSYSTEM=="cpu"/d' "$file"

+}

install() {

• local arch

• kdump_module_init kdump_install_conf remove_sysctl_conf

• # Onlining secondary cpus breaks kdump completely on KVM on Power hosts

• # Though we use maxcpus=1 by default but 40-redhat.rules will bring up all

• # possible cpus by default. (rhbz1270174 rhbz1266322)

• # Thus before we get the kernel fix and the systemd rule fix let's remove

• # the cpu online rule in kdump initramfs.

• arch=$(uname -m)

• if [[ "$arch" = "ppc64le" ]] || [[ "$arch" = "ppc64" ]]; then

•    remove_cpu_online_rule
  

• fi

• if is_ssh_dump_target; then kdump_install_random_seed fi

-- 2.31.1