linux-kernel - Re: [PATCH v7 10/11] qcomtee: enable TEE_IOC_SHM

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Message-ID: <d74404ec-44ad-412f-98ef-eed288ecf1bf@oss.qualcomm.com>
Date: Thu, 14 Aug 2025 00:49:41 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Apurupa Pattapu <quic_apurupa@...cinc.com>,
        Kees Cook <kees@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>
Cc: Harshal Dev <quic_hdev@...cinc.com>, linux-arm-msm@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-doc@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sumit Garg <sumit.garg@....qualcomm.com>
Subject: Re: [PATCH v7 10/11] qcomtee: enable TEE_IOC_SHM_ALLOC ioctl

On 8/14/25 12:24 AM, Amirreza Zarrabi wrote:
> 
> 
> On 8/13/2025 8:00 PM, Konrad Dybcio wrote:
>> On 8/13/25 2:35 AM, Amirreza Zarrabi wrote:
>>> Enable userspace to allocate shared memory with QTEE. Since
>>> QTEE handles shared memory as object, a wrapper is implemented
>>> to represent tee_shm as an object. The shared memory identifier,
>>> obtained through TEE_IOC_SHM_ALLOC, is transferred to the driver using
>>> TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT/OUTPUT.
>>>
>>> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
>>> Acked-by: Sumit Garg <sumit.garg@....qualcomm.com>
>>> Tested-by: Harshal Dev <quic_hdev@...cinc.com>
>>> Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>
>>> ---
>>
>> [...]
>>
>>> +/* Mapping information format as expected by QTEE. */
>>> +struct qcomtee_mapping_info {
>>> +	u64 paddr;
>>> +	u64 len;
>>> +	u32 perms;
>>> +} __packed;
>>
>> Please use types with explicit endianness, e.g. __le32. I'm assuming
>> TZ will always be little-endian, regardless of the host OS
>>
> 
> I'm not entirely sure how this point is relevant. As I understand it,
> the core that populates this struct is the same one that accesses it in TZ.
> Your argument would absolutely make sense if the host and TZ were operating
> on different cores with distinct architectures -- such as one being
> little-endian and the other big-endian, which is not the case.

CONFIG_CPU_BIG_ENDIAN=y exists on arm64

Konrad