I'm curious what happens if you try using RW for output as well. The compiler will sometimes need to read data in order to write to it.

I guess the other concern I'd have, without looking at it too much, is there a case where multiple parameters share the same page?

David

On Mon, Jun 20, 2016 at 12:12 AM machiry aravind <machiry_msidc@hotmail.com> wrote:

Hi all,


In optee-os, memory of all params is mapped RW, irrespective of paramType (viz, INPUT, OUTPUT or INOUT).


References:

https://github.com/OP-TEE/optee_os/blob/master/core/arch/arm/mm/tee_mmu.c#L394 and

https://github.com/OP-TEE/optee_os/blob/master/core/arch/arm/mm/tee_mmu.c#L62


Do we know why is this so?


I tried to change this to map R only for input, W for output and RW for inout.

However few tests (ex: 4001 - 4007) in xtest suite fails.




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