linux-kernel - Re: [PATCH v17 02/10] of: Add a common kexec FDT setup function

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Message-ID: <87y2fvo69q.fsf@manicouagan.localdomain>
Date:   Wed, 10 Feb 2021 20:24:49 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Cc:     zohar@...ux.ibm.com, robh@...nel.org, takahiro.akashi@...aro.org,
        gregkh@...uxfoundation.org, will@...nel.org, joe@...ches.com,
        catalin.marinas@....com, mpe@...erman.id.au, james.morse@....com,
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        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
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        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v17 02/10] of: Add a common kexec FDT setup function


Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> writes:

> From: Rob Herring <robh@...nel.org>
>
> Both arm64 and powerpc do essentially the same FDT /chosen setup for
> kexec.  The differences are either omissions that arm64 should have
> or additional properties that will be ignored.  The setup code can be
> combined and shared by both powerpc and arm64.
>
> The differences relative to the arm64 version:
>  - If /chosen doesn't exist, it will be created (should never happen).
>  - Any old dtb and initrd reserved memory will be released.
>  - The new initrd and elfcorehdr are marked reserved.
>  - "linux,booted-from-kexec" is set.
>
> The differences relative to the powerpc version:
>  - "kaslr-seed" and "rng-seed" may be set.
>  - "linux,elfcorehdr" is set.
>  - Any existing "linux,usable-memory-range" is removed.
>
> Combine the code for setting up the /chosen node in the FDT and updating
> the memory reservation for kexec, for powerpc and arm64, in
> of_kexec_alloc_and_setup_fdt() and move it to "drivers/of/kexec.c".
>
> Signed-off-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> ---
>  drivers/of/Makefile |   6 ++
>  drivers/of/kexec.c  | 258 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/of.h  |  13 +++
>  3 files changed, 277 insertions(+)
>  create mode 100644 drivers/of/kexec.c

Reviewed-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>

-- 
Thiago Jung Bauermann
IBM Linux Technology Center