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References: <20210614223317.999867-1-tyhicks@linux.microsoft.com> <20210614223317.999867-7-tyhicks@linux.microsoft.com>
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From:   Jens Wiklander <jens.wiklander@linaro.org>
Date:   Tue, 15 Jun 2021 09:10:08 +0200
Message-ID: <CAHUa44G+hxjckap1e1qZXTf6vQqQYNMw=ofzdFCP1OgCXQsF5Q@mail.gmail.com>
Subject: Re: [PATCH v5 6/8] tee: Correct inappropriate usage of
 TEE_SHM_DMA_BUF flag
To:     Tyler Hicks <tyhicks@linux.microsoft.com>
Cc:     Allen Pais <apais@linux.microsoft.com>,
        Sumit Garg <sumit.garg@linaro.org>,
        Peter Huewe <peterhuewe@gmx.de>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Vikas Gupta <vikas.gupta@broadcom.com>,
        Thirupathaiah Annapureddy <thiruan@microsoft.com>,
        Pavel Tatashin <pasha.tatashin@soleen.com>,
        =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>,
        OP-TEE TrustedFirmware <op-tee@lists.trustedfirmware.org>,
        linux-integrity <linux-integrity@vger.kernel.org>,
        bcm-kernel-feedback-list@broadcom.com, linux-mips@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, Jun 15, 2021 at 12:33 AM Tyler Hicks
<tyhicks@linux.microsoft.com> wrote:
>
> From: Sumit Garg <sumit.garg@linaro.org>
>
> Currently TEE_SHM_DMA_BUF flag has been inappropriately used to not
> register shared memory allocated for private usage by underlying TEE
> driver: OP-TEE in this case. So rather add a new flag as TEE_SHM_PRIV
> that can be utilized by underlying TEE drivers for private allocation
> and usage of shared memory.
>
> With this corrected, allow tee_shm_alloc_kernel_buf() to allocate a
> shared memory region without the backing of dma-buf.
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> Co-developed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> ---
>  drivers/tee/optee/call.c     | 2 +-
>  drivers/tee/optee/core.c     | 3 ++-
>  drivers/tee/optee/rpc.c      | 5 +++--
>  drivers/tee/optee/shm_pool.c | 8 ++++++--
>  drivers/tee/tee_shm.c        | 4 ++--
>  include/linux/tee_drv.h      | 1 +
>  6 files changed, 15 insertions(+), 8 deletions(-)

Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>