Hi, Olivier, In our setup, Hafnium commit: 997476a74571aec4f1a23590d45edf516f3934f4 optee version: 3.20.0 Thanks. Regards, Yuye. ------------------------------------------------------------------ 发件人：Olivier Deprez Olivier.Deprez@arm.com 发送时间：2023年4月12日(星期三) 15:22 收件人：梅建强(禹夜) meijianqiang.mjq@alibaba-inc.com 抄 送：hafnium hafnium@lists.trustedfirmware.org; Jens Wiklander jens.wiklander@linaro.org 主 题：Re: fragment transmission while retrieving memory 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 <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.