linux-kernel - [PATCH v2 0/2] x86/kexec: Carry forward the boot DTB on kexec

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Message-ID: <20250805211527.122367-1-makb@juniper.net>
Date: Tue, 5 Aug 2025 14:15:25 -0700
From: Brian Mak <makb@...iper.net>
To: Baoquan He <bhe@...hat.com>, Dave Young <dyoung@...hat.com>,
        "Alexander
 Graf" <graf@...zon.com>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
	<mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen
	<dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Andrew
 Morton" <akpm@...ux-foundation.org>,
        Rob Herring <robh@...nel.org>,
        "Saravana
 Kannan" <saravanak@...gle.com>, <x86@...nel.org>,
        <kexec@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Brian Mak <makb@...iper.net>
Subject: [PATCH v2 0/2] x86/kexec: Carry forward the boot DTB on kexec

Hi all,

Here is v2 with the comments from v1 addressed. I also added a patch to
the series to add KEXEC_FILE_NO_CMA as a legal flag. I noticed that this
was missing when I went to add my KEXEC_FILE_FORCE_DTB flag.

Thanks,
Brian

Changes in v2:
- Added a patch to add KEXEC_FILE_NO_CMA as a legal flag
- Added a KEXEC_FILE_FORCE_DTB flag to enable carrying over the current
  boot's DTB on x86.
- Modified the commit message to include more reasoning for the change.
- Changed a pr_info print to a pr_debug print.

Brian Mak (2):
  kexec: Add KEXEC_FILE_NO_CMA as a legal flag
  x86/kexec: Carry forward the boot DTB on kexec

 arch/x86/kernel/kexec-bzimage64.c | 47 +++++++++++++++++++++++++++++--
 include/linux/kexec.h             |  6 +++-
 include/uapi/linux/kexec.h        |  4 +++
 kernel/kexec_file.c               |  1 +
 4 files changed, 54 insertions(+), 4 deletions(-)


base-commit: 35a813e010b99894bb4706c56c16a580bf7959c2
-- 
2.25.1