linux-kernel - Re: [PATCH v6 3/3] arm64: Add IMA kexec buffer to DTB

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Message-ID: <87363nu18a.fsf@morokweng.localdomain>
Date:   Sat, 12 Sep 2020 00:23:49 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
Cc:     zohar@...ux.ibm.com, robh@...nel.org, gregkh@...uxfoundation.org,
        james.morse@....com, catalin.marinas@....com, sashal@...nel.org,
        will@...nel.org, mpe@...erman.id.au, benh@...nel.crashing.org,
        paulus@...ba.org, robh+dt@...nel.org, frowand.list@...il.com,
        vincenzo.frascino@....com, mark.rutland@....com,
        dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com,
        pasha.tatashin@...een.com, allison@...utok.net,
        kstewart@...uxfoundation.org, takahiro.akashi@...aro.org,
        tglx@...utronix.de, masahiroy@...nel.org, bhsharma@...hat.com,
        mbrugger@...e.com, hsinyi@...omium.org, tao.li@...o.com,
        christophe.leroy@....fr, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        prsriva@...ux.microsoft.com, balajib@...ux.microsoft.com
Subject: Re: [PATCH v6 3/3] arm64: Add IMA kexec buffer to DTB


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

> Any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device tree
> needs to be removed and its corresponding memory reservation in
> the currently running kernel needs to be freed.
>
> The address and size of the current kernel's IMA measurement log need
> to be added to the device tree's IMA kexec buffer node and memory for
> the buffer needs to be reserved for the log to be carried over to
> the next kernel on the kexec call.
>
> Remove any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device
> tree and free the corresponding memory reservation in the currently
> running kernel. Add FDT_PROP_IMA_KEXEC_BUFFER property to the device
> tree and reserve the memory for storing the IMA log.
> Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC to indicate
> that the IMA measurement log information is present in the device tree
> for ARM64.
>
> Co-developed-by: Prakhar Srivastava <prsriva@...ux.microsoft.com>
> Signed-off-by: Prakhar Srivastava <prsriva@...ux.microsoft.com>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>

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

-- 
Thiago Jung Bauermann
IBM Linux Technology Center