Renode-QEMU Co-simulation

Shared memory between Renode and QEMU for Co-simulation

Usage

QEMU

1. add memory backend file parameters to the QEMU command line

   • set memory size:

     -m 2G

   • set memory backend file:

     -object memory-backend-file,id=pc.ram,size=2G,mem-path=/dev/shm/qemu-ram,prealloc=on,share=on

   • set memory backend for machine

     -machine memory-backend=pc.ram

   # example
   qemu-system-aarch64 \
   -M virt,gic-version=3 -m 2G \
   -object memory-backend-file,id=pc.ram,size=2G,mem-path=/dev/shm/qemu-ram,prealloc=on,share=on \
   -machine memory-backend=pc.ram \
   -cpu cortex-a53 -smp 4 \
   -serial mon:stdio -nographic \
   -kernel /your/linux/kernel/Image \
   -append "your bootargs" \
   -dtb /your/device/tree/blob.dtb

2. start QEMU with memory file backend params and check if the file /dev/shm/qemu-ram has been generated

Renode

1. replace MappedMemory with SharedMemory in your_renode_platform.repl

   ram: Memory.SharedMemory @ sysbus 0xC0000000
       offset: 0x3c100000
       size: 0x40000000
       filePath: "/dev/shm/qemu-ram"
   

2. include SharedMemory.cs plugin in your_renode_script.resc

   include $ORIGIN/SharedMemory.cs
   machine LoadPlatformDescription $ORIGIN/your_renode_platform.repl
   

3. start Renode emulation after QEMU has booted and created /dev/shm/qemu-ram file