Bug 1973564

Summary:	kernel cmdline in BLS snippet are overwritten by grub2-mkconfig on ppc64le OPAL with old Petitboot
Product:	Red Hat Enterprise Linux 9	Reporter:	Javier Martinez Canillas <fmartine>
Component:	grub2	Assignee:	Javier Martinez Canillas <fmartine>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Release Test Team <release-test-team>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	CentOS Stream	CC:	bstinson, jieli, jwboyer, pholica, pjanda, pzatko
Target Milestone:	beta	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	grub2-2.06~rc1-9.el9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-07 21:33:05 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1971841

Description Javier Martinez Canillas 2021-06-18 07:48:10 UTC

Description of problem:

The ppc64le machines with an OPAL firmware (bare metal) use the Petitboot user-space bootloader to kexec the RHEL kernel.

Petiboot has support to parse BLS snippets since version 1.8.0, so older versions must use a GRUB configuration with menuentry commands instead.

The /etc/grub.d/10_linux script generates such config using the BLS snippets, to support Petitboot versions without BLS support.

But while doing that, it's wrongly overwriting the kernel command line parameters.

Version-Release number of selected component (if applicable):

grub2-2.06~rc1-8.el9

How reproducible:

Easy

Steps to Reproduce:
1. Provision a ppc64le OPAL machine (Petitboot < 1.8.0) with CentOS Stream 9 / RHEL9 
2. Update the kernel cmdline params with grubby --update-kernel DEFAULT --args foo=bar
3. Reboot and check that the cmdline is not set.

Actual results:

The cmdline set is not present in /proc/cmdline after a reboot.

Expected results:

The cmdline set is present in /proc/cmdline

Additional info: