linux-kernel - Re: [PATCH v2] tee: amdtee: unload TA only when its refcount becomes 0

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Message-ID: <1318f015-40cb-2bdd-17fb-2a3843ed45bc@amd.com>
Date:   Mon, 12 Apr 2021 15:49:51 +0530
From:   Rijo Thomas <Rijo-john.Thomas@....com>
To:     Jens Wiklander <jens.wiklander@...aro.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Devaraj Rangasamy <Devaraj.Rangasamy@....com>,
        Mythri Pandeshwara krishna <mythri.pandeshwarakrishna@....com>,
        OP-TEE TrustedFirmware <op-tee@...ts.trustedfirmware.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tee: amdtee: unload TA only when its refcount becomes
 0



On 12/04/21 1:06 pm, Jens Wiklander wrote:
> On Mon, Apr 5, 2021 at 11:43 AM Rijo Thomas <Rijo-john.Thomas@....com> wrote:
>>
>> Same Trusted Application (TA) can be loaded in multiple TEE contexts.
>>
>> If it is a single instance TA, the TA should not get unloaded from AMD
>> Secure Processor, while it is still in use in another TEE context.
>>
>> Therefore reference count TA and unload it when the count becomes zero.
>>
>> Fixes: 757cc3e9ff1d ("tee: add AMD-TEE driver")
>> Reviewed-by: Devaraj Rangasamy <Devaraj.Rangasamy@....com>
>> Signed-off-by: Rijo Thomas <Rijo-john.Thomas@....com>
>> ---
>> v2:
>>  * Unload TA if get_ta_refcount() fails
>>
>>  drivers/tee/amdtee/amdtee_private.h | 13 ++++
>>  drivers/tee/amdtee/call.c           | 94 ++++++++++++++++++++++++++---
>>  drivers/tee/amdtee/core.c           | 15 +++--
>>  3 files changed, 106 insertions(+), 16 deletions(-)
> 
> Looks good to me. Please address Dan's comment.
> 

Hi Jens,

I have replied to Dan's comment.

If you are okay with the current patch, request you to pull this.

Thanks,
Rijo

> Cheers,
> Jens
>