linux-kernel - Re: [PATCH v4 04/15] firmware: qcom: add a dedicated TrustZone buffer allocator

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Message-ID: <uvfqkpusd26asckyeeixfntsvqfe2vrk27lcmafrt6r26qil7n@ea5jfns346ix>
Date:   Fri, 13 Oct 2023 09:59:03 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Alex Elder <elder@...aro.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...cinc.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 04/15] firmware: qcom: add a dedicated TrustZone
 buffer allocator

On Fri, Oct 13, 2023 at 01:48:32PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> We have several SCM calls that require passing buffers to the TrustZone
> on top of the SMC core which allocates memory for calls that require
> more than 4 arguments.
> 
> Currently every user does their own thing which leads to code
> duplication. Many users call dma_alloc_coherent() for every call which
> is terribly unperformant (speed- and size-wise).
> 
> Provide a set of library functions for creating and managing pool of
> memory which is suitable for sharing with the TrustZone, that is:
> page-aligned, contiguous and non-cachable as well as provides a way of
> mapping of kernel virtual addresses to physical space.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

I'm still on the fence about introducing the Kconfig for the "just
in case the hypervisor is bad on some boards", but I spent a
while looking at this and it all looks good to me, so that opinion
aside...

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>