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Outside of postcopy mode, neither VHOST_USER_ADD_MEM_REG nor VHOST_USER_REM_MEM_REG are supposed to send a reply unless explicitly requested with the need_reply flag. Their current implementation always sends a reply, even if it isn't requested. This confuses the master because it will interpret the reply as a reply for the next message for which it actually expects a reply. need_reply is already handled correctly by vu_dispatch(), so just don't send a reply in the non-postcopy part of the message handler for these two commands. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20220407133657.155281-3-kwolf@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>