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

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Message-ID: <9B71EC74-D1F4-4F7D-837A-A43E53CEBB89@juniper.net>
Date: Tue, 12 Aug 2025 18:00:15 +0000
From: Brian Mak <makb@...iper.net>
To: Baoquan He <bhe@...hat.com>, Dave Young <dyoung@...hat.com>,
        Andrew Morton
	<akpm@...ux-foundation.org>
CC: 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>, Rob Herring
	<robh@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "x86@...nel.org"
	<x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] x86/kexec: Carry forward the boot DTB on kexec

On Aug 5, 2025, at 2:15 PM, Brian Mak <makb@...iper.net> wrote:

> 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

I see Andrew has sent these patches to linux-next. Thanks for that,
Andrew!

Dave and Baoquan, have you two had a chance to peek at the updated patch
set yet?

Thanks,
Brian