cpu-kvm: Make using perf when using KVM CPU optional (#95)
* cpu-kvm: Add a variable signifying whether we are using perf Change-Id: Iaa081e364f85c863f781723b5524d267724ed0e4 Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * cpu-kvm: Making it clear the functionalities are specific to KVM Change-Id: I982426f294d90655227dc15337bf73c42a260ded Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * cpu-kvm: Make perf optional Change-Id: I8973c2a96575383976cea7ca3fda478f83e95c3f Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * configs: Add an example config of using KVM without perf Change-Id: Ic69fa7dac4f1a2c8fe23712b0fa77b5b22c5f2df Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * Apply suggestions from code review Co-authored-by: Jason Lowe-Power <jason@lowepower.com> * misc: Add an example to the panic Change-Id: Ic1fdfb955e5d8b9ad1d4f0a2bf30fa8050deba70 Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * misc: Add warning of not using perf when using KVM CPU Change-Id: I96c0832fb48c63a79773665ca6228da778ef0497 Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * misc: Fix stuff Change-Id: Ib407ae7407955b695f0e0f2718324f41bb0d768f Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> * misc: style fix Change-Id: I7275942e43f46140fdd52c975f76abb3c81b8b0a Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> --------- Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> Co-authored-by: Jason Lowe-Power <jason@lowepower.com>
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Hoa Nguyen
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configs/example/gem5_library/x86-ubuntu-run-with-kvm-no-perf.py
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configs/example/gem5_library/x86-ubuntu-run-with-kvm-no-perf.py
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# Copyright (c) 2023 The Regents of the University of California
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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This script demonstrates how to use KVM CPU without perf.
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This simulation boots Ubuntu 18.04 using 2 KVM CPUs without using perf.
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Usage
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-----
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```
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scons build/X86/gem5.opt -j`nproc`
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./build/X86/gem5.opt configs/example/gem5_library/x86-ubuntu-run-with-kvm-no-perf.py
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```
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"""
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from gem5.utils.requires import requires
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from gem5.components.boards.x86_board import X86Board
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from gem5.components.cachehierarchies.ruby.mesi_two_level_cache_hierarchy import (
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MESITwoLevelCacheHierarchy,
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)
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from gem5.components.memory.single_channel import SingleChannelDDR4_2400
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from gem5.components.processors.simple_switchable_processor import (
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SimpleSwitchableProcessor,
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)
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from gem5.components.processors.cpu_types import CPUTypes
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from gem5.isas import ISA
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from gem5.coherence_protocol import CoherenceProtocol
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from gem5.simulate.simulator import Simulator
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from gem5.simulate.exit_event import ExitEvent
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from gem5.resources.workload import Workload
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# This simulation requires using KVM with gem5 compiled for X86 simulation
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# and with MESI_Two_Level cache coherence protocol.
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requires(
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isa_required=ISA.X86,
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coherence_protocol_required=CoherenceProtocol.MESI_TWO_LEVEL,
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kvm_required=True,
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)
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from gem5.components.cachehierarchies.ruby.mesi_two_level_cache_hierarchy import (
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MESITwoLevelCacheHierarchy,
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)
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cache_hierarchy = MESITwoLevelCacheHierarchy(
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l1d_size="32KiB",
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l1d_assoc=8,
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l1i_size="32KiB",
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l1i_assoc=8,
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l2_size="512KiB",
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l2_assoc=16,
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num_l2_banks=1,
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)
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# Main memory
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memory = SingleChannelDDR4_2400(size="3GiB")
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# This is a switchable CPU. We first boot Ubuntu using KVM, then the guest
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# will exit the simulation by calling "m5 exit" (see the `command` variable
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# below, which contains the command to be run in the guest after booting).
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# Upon exiting from the simulation, the Exit Event handler will switch the
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# CPU type (see the ExitEvent.EXIT line below, which contains a map to
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# a function to be called when an exit event happens).
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processor = SimpleSwitchableProcessor(
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starting_core_type=CPUTypes.KVM,
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switch_core_type=CPUTypes.TIMING,
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isa=ISA.X86,
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num_cores=2,
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)
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# Here we tell the KVM CPU (the starting CPU) not to use perf.
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for proc in processor.start:
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proc.core.usePerf = False
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# Here we setup the board. The X86Board allows for Full-System X86 simulations.
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board = X86Board(
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clk_freq="3GHz",
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processor=processor,
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memory=memory,
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cache_hierarchy=cache_hierarchy,
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)
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# Here we set the Full System workload.
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# The `set_kernel_disk_workload` function for the X86Board takes a kernel, a
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# disk image, and, optionally, a command to run.
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# This is the command to run after the system has booted. The first `m5 exit`
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# will stop the simulation so we can switch the CPU cores from KVM to timing
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# and continue the simulation to run the echo command, sleep for a second,
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# then, again, call `m5 exit` to terminate the simulation. After simulation
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# has ended you may inspect `m5out/system.pc.com_1.device` to see the echo
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# output.
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command = (
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"m5 exit;"
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+ "echo 'This is running on Timing CPU cores.';"
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+ "sleep 1;"
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+ "m5 exit;"
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)
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workload = Workload("x86-ubuntu-18.04-boot")
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workload.set_parameter("readfile_contents", command)
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board.set_workload(workload)
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simulator = Simulator(
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board=board,
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on_exit_event={
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# Here we want override the default behavior for the first m5 exit
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# exit event. Instead of exiting the simulator, we just want to
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# switch the processor. The 2nd m5 exit after will revert to using
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# default behavior where the simulator run will exit.
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ExitEvent.EXIT: (func() for func in [processor.switch])
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},
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)
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simulator.run()
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