Linux Kernel Module Cheat

24.3.1.2. gem5 ARM full system with more than 8 cores

https://stackoverflow.com/questions/50248067/how-to-run-a-gem5-arm-aarch64-full-system-simulation-with-fs-py-with-more-than-8

With GICv3, tested at LKMC 224fae82e1a79d9551b941b19196c7e337663f22 gem5 3ca404da175a66e0b958165ad75eb5f54cb5e772 on vanilla kernel:

./run \
  --arch aarch64 \
  --emulator gem5 \
  --cpus 16 \
  -- \
  --machine-type VExpress_GEM5_V2 \
;

boots to a shell and nproc shows 16.

For the GICv2 extension method, build the kernel with the gem5 arm Linux kernel patches, and then run:

./run \
  --arch aarch64 \
  --linux-build-id gem5-v4.15 \
  --emulator gem5 \
  --cpus 16 \
  -- \
  --param 'system.realview.gic.gem5_extensions = True' \
;

Tested in LKMC 788087c6f409b84adf3cff7ac050fa37df6d4c46. It fails after boot with FATAL: kernel too old as mentioned at: gem5 arm Linux kernel patches but everything seems to work on the gem5 side of things.