linux-hardening - Re: [REBASE PATCH v5 08/17] arm64: mm: Add dynamic ramoops region support through command line

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Date:   Tue, 12 Sep 2023 11:18:20 +0100
From:   Will Deacon <will@...nel.org>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
Cc:     corbet@....net, agross@...nel.org, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com,
        mathieu.poirier@...aro.org, catalin.marinas@....com,
        linus.walleij@...aro.org, andy.shevchenko@...il.com,
        vigneshr@...com, nm@...com, matthias.bgg@...il.com,
        kgene@...nel.org, alim.akhtar@...sung.com, bmasney@...hat.com,
        quic_tsoni@...cinc.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, kernel@...cinc.com
Subject: Re: [REBASE PATCH v5 08/17] arm64: mm: Add dynamic ramoops region
 support through command line

On Mon, Sep 11, 2023 at 04:23:50PM +0530, Mukesh Ojha wrote:
> The reserved memory region for ramoops is assumed to be at a fixed
> and known location when read from the devicetree. This may not be
> required for something like Qualcomm's minidump which is interested
> in knowing addresses of ramoops region but it does not put hard
> requirement of address being fixed as most of it's SoC does not
> support warm reset and does not use pstorefs at all instead it has
> firmware way of collecting ramoops region if it gets to know the
> address and register it with apss minidump table which is sitting
> in shared memory region in DDR and firmware will have access to
> these table during reset and collects it on crash of SoC.
> 
> So, add the support of reserving ramoops region to be dynamically
> allocated early during boot if it is request through command line
> via 'dyn_ramoops_size=' and fill up reserved resource structure and
> export the structure, so that it can be read by ramoops driver.
> 
> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> ---
>  arch/arm64/mm/init.c       | 94 ++++++++++++++++++++++++++++++++++++++++++++++

Why does this need to be in the arch code? There's absolutely nothing
arm64-specific here.

Will