Soulja Boy's negotiating a cease-fire with Shia LaBeouf ... terms and conditions apply.
The rapper tells TMZ he's willing to give Shia a hall pass to return to the ATL if the actor can help him cross over into movies -- and a particular big budget one too.
Soulja's response to Shia's third diss track, which dropped Monday ... isn't all olive branches though.
In fact, it's filled with more threats than anything else.
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