linux-kernel - Re: [PATCH v2 0/8] dma-buf: heaps: Add secure heap

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Message-ID: <ZU/V2XX71GbaV6Q8@duo.ucw.cz>
Date:   Mon, 13 Nov 2023 12:38:28 +0100
From:   Pavel Machek <pavel@....cz>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        christian.koenig@....com,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <jstultz@...gle.com>, tjmercier@...gle.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, jianjiao.zeng@...iatek.com,
        kuohong.wang@...iatek.com,
        Vijayanand Jitta <quic_vjitta@...cinc.com>,
        Joakim Bech <joakim.bech@...aro.org>,
        Jeffrey Kardatzke <jkardatzke@...gle.com>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        ckoenig.leichtzumerken@...il.com
Subject: Re: [PATCH v2 0/8] dma-buf: heaps: Add secure heap

Hi!

> This patchset adds three secure heaps:
> 1) secure_mtk_cm: secure chunk memory for MediaTek SVP (Secure Video Path).
>    The buffer is reserved for the secure world after bootup and it is used
>    for vcodec's ES/working buffer;
> 2) secure_mtk_cma: secure CMA memory for MediaTek SVP. This buffer is
>    dynamically reserved for the secure world and will be got when we start
>    playing secure videos, Once the security video playing is complete, the
>    CMA will be released. This heap is used for the vcodec's frame buffer. 
> 3) secure_cma: Use the kerne CMA ops as the allocation ops. 
>    currently it is a draft version for Vijay and Jaskaran.

Is there high-level description of what the security goals here are,
somewhere?

BR,
									Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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