Re: [Xen-devel] [PATCH v5 08/10] xen/arm: optee: add support for RPC commands

[Julien Grall <julien.grall@xxxxxxx>]

Hi Volodymyr,

On 21/05/2019 22:26, Volodymyr Babchuk wrote:
> OP-TEE can issue multiple RPC requests. We are interested mostly in
> request that asks NW to allocate/free shared memory for OP-TEE
> needs, because mediator needs to do address translation in the same
> way as it was done for shared buffers registered by NW.
>
> OP-TEE can ask NW to allocate multiple buffers during the call.  We
> know that if OP-TEE asks for another buffer, we can free pglist for
> the previous one.
>
> As mediator now accesses shared command buffer, we need to shadow
> it in the same way, as we shadow request buffers for STD calls.
> Earlier, we just passed address of this buffer to OP-TEE, but
> now we need to read and write to it, so it should be shadowed.
>
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

--
Julien Grall

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