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This commit: https://gem5-review.googlesource.com/c/public/gem5/+/62471 set `sim_quantum` for any simulation done via the Simulator module. However, this causes issues when setting exit events at a particular tick. It resulted in the exit being off by the `sim_quantum` value. This is required for KVM setups but is undesirable for non-KVM setups. Ergo, this commit ensures the `sim_quantum` is only set in cases where KVM cores are included in a simulation. There are two items of note here: 1. When using the SwitchableProcessor the KVM cores may be switched out and therefore not accessable via the `get_cores` method. To get round this we check if the processor is a SwitchableProcessor and run an additionial check that _any_ of the cores in the SwitchableProcessor are KVM. This is a big hacky; the Processor API should be changed to make this easier. 2. This only partially fixes the problem of exit events being off given a specified tick. This will still occur in the case a SwitchableProcessor is used containing KVM cores. E.g., non-KVM cores will still be "off" when KVM cores are switched out. This issue will be addressed in a later commit. Change-Id: Id966d76cd1630b6c41c5972fa9423c9e48eafaf6 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/63051 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.