linux-kernel - Re: [PATCH 1/2] ARM: at91: add sam_linux_is_in_normal

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Date:   Mon, 04 Jul 2022 19:34:02 +0200
From:   clement.leger@...tlin.com
To:     Claudiu.Beznea@...rochip.com
Cc:     linux@...linux.org.uk, Nicolas.Ferre@...rochip.com,
        alexandre.belloni@...tlin.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com
Subject: Re: [PATCH 1/2] ARM: at91: add sam_linux_is_in_normal_world()
 function

Le 2022-07-04 08:19, Claudiu.Beznea@...rochip.com a écrit :
> Hi, Clement,
> 
> On 06.06.2022 17:57, Clément Léger wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know 
>> the content is safe
>> 
>> Add sam_linux_is_in_normal_world() which allows to know if Linux is
>> running in the normal world or not. This function is used by code
>> which needs to differentiate the world in which Linux is running.
>> 
>> Signed-off-by: Clément Léger <clement.leger@...tlin.com>
>> ---
>>  arch/arm/mach-at91/sam_secure.c | 6 ++++++
>>  arch/arm/mach-at91/sam_secure.h | 1 +
>>  2 files changed, 7 insertions(+)
>> 
>> diff --git a/arch/arm/mach-at91/sam_secure.c 
>> b/arch/arm/mach-at91/sam_secure.c
>> index 2a01f7a7d13f..1ec8c8b9d119 100644
>> --- a/arch/arm/mach-at91/sam_secure.c
>> +++ b/arch/arm/mach-at91/sam_secure.c
>> @@ -27,6 +27,12 @@ struct arm_smccc_res sam_smccc_call(u32 fn, u32 
>> arg0, u32 arg1)
>>         return res;
>>  }
>> 
>> +bool sam_linux_is_in_normal_world(void)
>> +{
>> +       /* If optee has been detected, then we are running in normal 
>> world */
> 
> In case optee hasn't been detected don't we run also in normal world?
> What I want to say is that maybe you can change the function name to
> something like sam_linux_is_optee_available().

I would say it depends on the bootloader configuration, but Linux can 
run
in secure world also. It would not change a lot of thing though.
However, you are right sam_linux_optee_is_available() seems easier to
understand ;)

Clément