599b59b387
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.
68 lines
2.9 KiB
Python
68 lines
2.9 KiB
Python
# -*- mode:python -*-
|
|
|
|
# Copyright (c) 2012 ARM Limited
|
|
# All rights reserved.
|
|
#
|
|
# The license below extends only to copyright in the software and shall
|
|
# not be construed as granting a license to any other intellectual
|
|
# property including but not limited to intellectual property relating
|
|
# to a hardware implementation of the functionality of the software
|
|
# licensed hereunder. You may use the software subject to the license
|
|
# terms below provided that you ensure that this notice is replicated
|
|
# unmodified and in its entirety in all distributions of the software,
|
|
# modified or unmodified, in source code or in binary form.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met: redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer;
|
|
# redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution;
|
|
# neither the name of the copyright holders nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
#
|
|
# Authors: Andreas Sandberg
|
|
|
|
Import('*')
|
|
|
|
if env['USE_KVM']:
|
|
SimObject('KvmVM.py')
|
|
SimObject('BaseKvmCPU.py')
|
|
|
|
Source('base.cc')
|
|
Source('vm.cc')
|
|
Source('perfevent.cc')
|
|
Source('timer.cc')
|
|
|
|
if env['TARGET_ISA'] == 'arm':
|
|
SimObject('ArmKvmCPU.py')
|
|
Source('arm_cpu.cc')
|
|
elif env['TARGET_ISA'] == 'x86':
|
|
SimObject('X86KvmCPU.py')
|
|
Source('x86_cpu.cc')
|
|
|
|
DebugFlag('Kvm', 'Basic KVM Functionality')
|
|
DebugFlag('KvmContext', 'KVM/gem5 context synchronization')
|
|
DebugFlag('KvmIO', 'KVM MMIO diagnostics')
|
|
DebugFlag('KvmInt', 'KVM Interrupt handling')
|
|
DebugFlag('KvmRun', 'KvmRun entry/exit diagnostics')
|
|
DebugFlag('KvmTimer', 'KVM timing')
|
|
|
|
CompoundFlag('KvmAll', [ 'Kvm', 'KvmContext', 'KvmRun',
|
|
'KvmIO', 'KvmInt', 'KvmTimer' ],
|
|
'All KVM debug flags')
|