Is it possible to obtain and modify actual data in zns.c?

[realcedriccheng]

Hello, I am new to FEMU and QEMU and I am currently trying to use FEMU as a ZNS emulator. I was wondering is it possible to obtain and modify actual data in zns.c?

Currently FEMU let the backend_rw to handle read and write data of &req->qsg. And data in qsg seem reachable by cur_addr and cur_len. How can I create a buffer in zns.c and copy the data into it, and then use the buffer as the argument of backend_rw?

I tried previously and FEMU just stopped working. I guess this is related to some constraints of address space. Could you please give me some tips on it?

Thanks a lot!