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This changeset adds support for KVM on x86. Full support is split across a number of commits since some features are relatively complex. This changeset includes support for: * Integer state synchronization (including segment regs) * CPUID (gem5's CPUID values are inserted into KVM) * x86 legacy IO (remapped and handled by gem5's memory system) * Memory mapped IO * PCI * MSRs * State dumping Most of the functionality is fairly straight forward. There are some quirks to support PCI enumerations since this is done in the TLB(!) in the simulated CPUs. We currently replicate some of that code. Unlike the ARM implementation, the x86 implementation of the virtual CPU does not use the cycles hardware counter. KVM on x86 simulates the time stamp counter (TSC) in the kernel. If we just measure host cycles using perfevent, we might end up measuring a slightly different number of cycles. If we don't get the cycle accounting right, we might end up rewinding the TSC, with all kinds of chaos as a result. An additional feature of the KVM CPU on x86 is extended state dumping. This enables Python scripts controlling the simulator to request dumping of a subset of the processor state. The following methods are currenlty supported: * dumpFpuRegs * dumpIntRegs * dumpSpecRegs * dumpDebugRegs * dumpXCRs * dumpXSave * dumpVCpuEvents * dumpMSRs Known limitations: * M5 ops are currently not supported. * FPU synchronization is not supported (only affects CPU switching). Both of the limitations will be addressed in separate commits.
This is the gem5 simulator.
For detailed information about building the simulator and getting
started please refer to:
* The main website: http://www.gem5.org
* Documentation wiki: http://www.gem5.org/Documentation
* Doxygen generated: http://www.gem5.org/docs
* Tutorials: http://www.gem5.org/Tutorials
Specific pages of interest are:
http://www.gem5.org/Introduction
http://www.gem5.org/Build_System
http://www.gem5.org/Dependencies
http://www.gem5.org/Running_gem5
Short version:
External tools and required versions
To build gem5, you will need the following software:
g++ version 4.3 or newer.
Python, version 2.4 - 2.7 (we don't support Python 3.X). gem5 links in the
Python interpreter, so you need the Python header files and shared
library (e.g., /usr/lib/libpython2.4.so) in addition to the interpreter
executable. These may or may not be installed by default. For example,
on Debian/Ubuntu, you need the "python-dev" package in addition to the
"python" package. If you need a newer or different Python installation
but can't or don't want to upgrade the default Python on your system,
see http://www.gem5.org/Using_a_non-default_Python_installation
SCons, version 0.98.1 or newer. SCons is a powerful replacement for make.
If you don't have administrator privileges on your machine, you can use the
"scons-local" package to install scons in your m5 directory, or install SCons
in your home directory using the '--prefix=' option.
SWIG, version 1.3.34 or newer
zlib, any recent version. For Debian/Ubuntu, you will need the "zlib-dev" or
"zlib1g-dev" package to get the zlib.h header file as well as the library
itself.
m4, the macro processor.
4. In this directory, type 'scons build/<ARCH>/gem5.opt' where ARCH is one
of ALPHA, ARM, MIPS, POWER, SPARC, or X86. This will build an optimized version
of the gem5 binary (gem5.opt) for the the specified architecture.
If you have questions, please send mail to gem5-users@gem5.org
WHAT'S INCLUDED (AND NOT)
-------------------------
The basic source release includes these subdirectories:
- gem5:
- configs: example simulation configuration scripts
- ext: less-common external packages needed to build gem5
- 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 will need compiled system firmware
(console and PALcode for Alpha), kernel binaries and one or more disk images.
Please see the gem5 download page for these items at http://www.gem5.org/Download