Hi, Olivier, Recently, I've been working on this issue. https://github.com/OP-TEE/optee_os/issues/5943 <https://github.com/OP-TEE/optee_os/issues/5943 > Do you know any differences between hafnium's current implementation of fragment transmission while retrieving memory and the example process described in FF-A 1.1 Figure 18.4? Regards, Yuye.
Hi Yuye,
AFAIK concerning Hafnium, fragmented mem sharing is supported for FFA_MEM_SHARE/LEND/DONATE and FFA_MEM_RETRIEVE_RESP. (For the sake of clarity, this isn't supported for FFA_MEM_RETRIEVE_REQ but this shouldn't be a concern as this limitation only exists in the case of mem sharing to multiple borrowers. In your case of a single borrower the mem retrieve req. shouldn't have to be fragmented).
Can you tell which hafnium commit hash is used in your setup?
At the moment, I cannot tell if the issue described concern a miss in Hafnium or OP-TEE. I need to dig a bit further into both implementations and I'll let you know.
Regards, Olivier.
________________________________ From: 梅建强(禹夜) meijianqiang.mjq@alibaba-inc.com Sent: 12 April 2023 08:21 To: Olivier Deprez Olivier.Deprez@arm.com Cc: hafnium hafnium@lists.trustedfirmware.org; Jens Wiklander jens.wiklander@linaro.org Subject: fragment transmission while retrieving memory
Hi, Olivier,
Recently, I've been working on this issue. https://github.com/OP-TEE/optee_os/issues/5943 Do you know any differences between hafnium's current implementation of fragment transmission while retrieving memory and the example process described in FF-A 1.1 Figure 18.4?
Regards, Yuye.
hafnium@lists.trustedfirmware.org
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Olivier Deprez -
梅建强(禹夜)