f49830ce0b
This patch tidies up how we create and set the fields of a Request. In essence it tries to use the constructor where possible (as opposed to setPhys and setVirt), thus avoiding spreading the information across a number of locations. In fact, setPhys is made private as part of this patch, and a number of places where we callede setVirt instead uses the appropriate constructor.
776 lines
24 KiB
C++
776 lines
24 KiB
C++
/*
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* Copyright (c) 2012 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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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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* Authors: Andreas Sandberg
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*/
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#ifndef __CPU_KVM_BASE_HH__
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#define __CPU_KVM_BASE_HH__
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#include <pthread.h>
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#include <csignal>
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#include <memory>
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#include "base/statistics.hh"
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#include "cpu/kvm/perfevent.hh"
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#include "cpu/kvm/timer.hh"
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#include "cpu/kvm/vm.hh"
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#include "cpu/base.hh"
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#include "cpu/simple_thread.hh"
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/** Signal to use to trigger exits from KVM */
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#define KVM_KICK_SIGNAL SIGRTMIN
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// forward declarations
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class ThreadContext;
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struct BaseKvmCPUParams;
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/**
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* Base class for KVM based CPU models
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*
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* All architecture specific KVM implementation should inherit from
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* this class. The most basic CPU models only need to override the
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* updateKvmState() and updateThreadContext() methods to implement
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* state synchronization between gem5 and KVM.
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*
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* The architecture specific implementation is also responsible for
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* delivering interrupts into the VM. This is typically done by
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* overriding tick() and checking the thread context before entering
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* into the VM. In order to deliver an interrupt, the implementation
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* then calls KvmVM::setIRQLine() or BaseKvmCPU::kvmInterrupt()
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* depending on the specifics of the underlying hardware/drivers.
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*/
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class BaseKvmCPU : public BaseCPU
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{
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public:
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BaseKvmCPU(BaseKvmCPUParams *params);
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virtual ~BaseKvmCPU();
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void init();
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void startup();
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void regStats();
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void serializeThread(std::ostream &os, ThreadID tid);
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void unserializeThread(Checkpoint *cp, const std::string §ion,
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ThreadID tid);
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unsigned int drain(DrainManager *dm);
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void drainResume();
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void switchOut();
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void takeOverFrom(BaseCPU *cpu);
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void verifyMemoryMode() const;
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MasterPort &getDataPort() { return dataPort; }
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MasterPort &getInstPort() { return instPort; }
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void wakeup();
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void activateContext(ThreadID thread_num);
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void suspendContext(ThreadID thread_num);
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void deallocateContext(ThreadID thread_num);
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void haltContext(ThreadID thread_num);
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ThreadContext *getContext(int tn);
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Counter totalInsts() const;
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Counter totalOps() const;
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/** Dump the internal state to the terminal. */
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virtual void dump();
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/**
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* Force an exit from KVM.
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*
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* Send a signal to the thread owning this vCPU to get it to exit
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* from KVM. Ignored if the vCPU is not executing.
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*/
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void kick() const { pthread_kill(vcpuThread, KVM_KICK_SIGNAL); }
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/**
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* A cached copy of a thread's state in the form of a SimpleThread
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* object.
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*
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* Normally the actual thread state is stored in the KVM vCPU. If KVM has
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* been running this copy is will be out of date. If we recently handled
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* some events within gem5 that required state to be updated this could be
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* the most up-to-date copy. When getContext() or updateThreadContext() is
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* called this copy gets updated. The method syncThreadContext can
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* be used within a KVM CPU to update the thread context if the
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* KVM state is dirty (i.e., the vCPU has been run since the last
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* update).
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*/
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SimpleThread *thread;
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/** ThreadContext object, provides an interface for external
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* objects to modify this thread's state.
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*/
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ThreadContext *tc;
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KvmVM &vm;
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protected:
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/**
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*
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* @dot
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* digraph {
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* Idle;
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* Running;
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* RunningService;
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* RunningServiceCompletion;
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*
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* Idle -> Idle;
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* Idle -> Running [label="activateContext()", URL="\ref activateContext"];
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* Running -> Running [label="tick()", URL="\ref tick"];
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* Running -> RunningService [label="tick()", URL="\ref tick"];
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* Running -> Idle [label="suspendContext()", URL="\ref suspendContext"];
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* Running -> Idle [label="drain()", URL="\ref drain"];
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* Idle -> Running [label="drainResume()", URL="\ref drainResume"];
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* RunningService -> RunningServiceCompletion [label="handleKvmExit()", URL="\ref handleKvmExit"];
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* RunningServiceCompletion -> Running [label="tick()", URL="\ref tick"];
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* RunningServiceCompletion -> RunningService [label="tick()", URL="\ref tick"];
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* }
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* @enddot
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*/
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enum Status {
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/** Context not scheduled in KVM.
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*
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* The CPU generally enters this state when the guest execute
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* an instruction that halts the CPU (e.g., WFI on ARM or HLT
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* on X86) if KVM traps this instruction. Ticks are not
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* scheduled in this state.
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*
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* @see suspendContext()
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*/
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Idle,
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/** Running normally.
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*
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* This is the normal run state of the CPU. KVM will be
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* entered next time tick() is called.
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*/
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Running,
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/** Requiring service at the beginning of the next cycle.
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*
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* The virtual machine has exited and requires service, tick()
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* will call handleKvmExit() on the next cycle. The next state
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* after running service is determined in handleKvmExit() and
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* depends on what kind of service the guest requested:
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* <ul>
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* <li>IO/MMIO: RunningServiceCompletion
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* <li>Halt: Idle
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* <li>Others: Running
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* </ul>
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*/
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RunningService,
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/** Service completion in progress.
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*
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* The VM has requested service that requires KVM to be
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* entered once in order to get to a consistent state. This
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* happens in handleKvmExit() or one of its friends after IO
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* exits. After executing tick(), the CPU will transition into
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* the Running or RunningService state.
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*/
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RunningServiceCompletion,
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};
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/** CPU run state */
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Status _status;
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/**
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* Execute the CPU until the next event in the main event queue or
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* until the guest needs service from gem5.
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*/
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void tick();
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/**
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* Get the value of the hardware cycle counter in the guest.
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*
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* This method is supposed to return the total number of cycles
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* executed in hardware mode relative to some arbitrary point in
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* the past. It's mainly used when estimating the number of cycles
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* actually executed by the CPU in kvmRun(). The default behavior
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* of this method is to use the cycles performance counter, but
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* some architectures may want to use internal registers instead.
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*
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* @return Number of host cycles executed relative to an undefined
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* point in the past.
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*/
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virtual uint64_t getHostCycles() const;
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/**
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* Request KVM to run the guest for a given number of ticks. The
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* method returns the approximate number of ticks executed.
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*
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* @note The returned number of ticks can be both larger or
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* smaller than the requested number of ticks. A smaller number
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* can, for example, occur when the guest executes MMIO. A larger
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* number is typically due to performance counter inaccuracies.
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*
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* @note This method is virtual in order to allow implementations
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* to check for architecture specific events (e.g., interrupts)
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* before entering the VM.
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*
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* @note It is the response of the caller (normally tick()) to
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* make sure that the KVM state is synchronized and that the TC is
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* invalidated after entering KVM.
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*
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* @note This method does not normally cause any state
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* transitions. However, if it may suspend the CPU by suspending
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* the thread, which leads to a transition to the Idle state. In
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* such a case, kvm <i>must not</i> be entered.
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*
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* @param ticks Number of ticks to execute, set to 0 to exit
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* immediately after finishing pending operations.
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* @return Number of ticks executed (see note)
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*/
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virtual Tick kvmRun(Tick ticks);
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/**
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* Request the CPU to run until draining completes.
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*
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* This function normally calls kvmRun(0) to make KVM finish
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* pending MMIO operations. Architecures implementing
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* archIsDrained() must override this method.
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*
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* @see BaseKvmCPU::archIsDrained()
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*
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* @return Number of ticks executed
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*/
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virtual Tick kvmRunDrain();
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/**
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* Get a pointer to the kvm_run structure containing all the input
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* and output parameters from kvmRun().
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*/
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struct kvm_run *getKvmRunState() { return _kvmRun; };
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/**
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* Retrieve a pointer to guest data stored at the end of the
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* kvm_run structure. This is mainly used for PIO operations
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* (KVM_EXIT_IO).
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*
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* @param offset Offset as specified by the kvm_run structure
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* @return Pointer to guest data
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*/
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uint8_t *getGuestData(uint64_t offset) const {
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return (uint8_t *)_kvmRun + offset;
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};
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/**
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* @addtogroup KvmInterrupts
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* @{
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*/
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/**
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* Send a non-maskable interrupt to the guest
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*
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* @note The presence of this call depends on Kvm::capUserNMI().
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*/
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void kvmNonMaskableInterrupt();
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/**
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* Send a normal interrupt to the guest
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*
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* @note Make sure that ready_for_interrupt_injection in kvm_run
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* is set prior to calling this function. If not, an interrupt
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* window must be requested by setting request_interrupt_window in
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* kvm_run to 1 and restarting the guest.
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*
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* @param interrupt Structure describing the interrupt to send
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*/
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void kvmInterrupt(const struct kvm_interrupt &interrupt);
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/** @} */
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/** @{ */
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/**
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* Get/Set the register state of the guest vCPU
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*
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* KVM has two different interfaces for accessing the state of the
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* guest CPU. One interface updates 'normal' registers and one
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* updates 'special' registers. The distinction between special
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* and normal registers isn't very clear and is architecture
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* dependent.
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*/
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void getRegisters(struct kvm_regs ®s) const;
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void setRegisters(const struct kvm_regs ®s);
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void getSpecialRegisters(struct kvm_sregs ®s) const;
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void setSpecialRegisters(const struct kvm_sregs ®s);
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/** @} */
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/** @{ */
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/**
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* Get/Set the guest FPU/vector state
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*/
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void getFPUState(struct kvm_fpu &state) const;
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void setFPUState(const struct kvm_fpu &state);
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/** @} */
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/** @{ */
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/**
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* Get/Set single register using the KVM_(SET|GET)_ONE_REG API.
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*
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* @note The presence of this call depends on Kvm::capOneReg().
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*/
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void setOneReg(uint64_t id, const void *addr);
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void setOneReg(uint64_t id, uint64_t value) { setOneReg(id, &value); }
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void setOneReg(uint64_t id, uint32_t value) { setOneReg(id, &value); }
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void getOneReg(uint64_t id, void *addr) const;
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uint64_t getOneRegU64(uint64_t id) const {
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uint64_t value;
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getOneReg(id, &value);
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return value;
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}
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uint32_t getOneRegU32(uint64_t id) const {
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uint32_t value;
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getOneReg(id, &value);
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return value;
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}
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/** @} */
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/**
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* Get and format one register for printout.
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*
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* This function call getOneReg() to retrieve the contents of one
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* register and automatically formats it for printing.
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*
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* @note The presence of this call depends on Kvm::capOneReg().
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*/
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std::string getAndFormatOneReg(uint64_t id) const;
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/** @{ */
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/**
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* Update the KVM state from the current thread context
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*
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* The base CPU calls this method before starting the guest CPU
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* when the contextDirty flag is set. The architecture dependent
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* CPU implementation is expected to update all guest state
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* (registers, special registers, and FPU state).
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*/
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virtual void updateKvmState() = 0;
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/**
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* Update the current thread context with the KVM state
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*
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* The base CPU after the guest updates any of the KVM state. In
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* practice, this happens after kvmRun is called. The architecture
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* dependent code is expected to read the state of the guest CPU
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* and update gem5's thread state.
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*/
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virtual void updateThreadContext() = 0;
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/**
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* Update a thread context if the KVM state is dirty with respect
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* to the cached thread context.
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*/
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void syncThreadContext();
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/**
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* Update the KVM if the thread context is dirty.
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*/
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void syncKvmState();
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/** @} */
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/** @{ */
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/**
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* Main kvmRun exit handler, calls the relevant handleKvmExit*
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* depending on exit type.
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*
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* @return Number of ticks spent servicing the exit request
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*/
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virtual Tick handleKvmExit();
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/**
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* The guest performed a legacy IO request (out/inp on x86)
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*
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* @return Number of ticks spent servicing the IO request
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*/
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virtual Tick handleKvmExitIO();
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/**
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* The guest requested a monitor service using a hypercall
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*
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* @return Number of ticks spent servicing the hypercall
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*/
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virtual Tick handleKvmExitHypercall();
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/**
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* The guest exited because an interrupt window was requested
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*
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* The guest exited because an interrupt window was requested
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* (request_interrupt_window in the kvm_run structure was set to 1
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* before calling kvmRun) and it is now ready to receive
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*
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* @return Number of ticks spent servicing the IRQ
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*/
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virtual Tick handleKvmExitIRQWindowOpen();
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/**
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* An unknown architecture dependent error occurred when starting
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* the vCPU
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*
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* The kvm_run data structure contains the hardware error
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* code. The defaults behavior of this method just prints the HW
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* error code and panics. Architecture dependent implementations
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* may want to override this method to provide better,
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* hardware-aware, error messages.
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*
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* @return Number of ticks delay the next CPU tick
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*/
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virtual Tick handleKvmExitUnknown();
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/**
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* An unhandled virtualization exception occured
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*
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* Some KVM virtualization drivers return unhandled exceptions to
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* the user-space monitor. This interface is currently only used
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* by the Intel VMX KVM driver.
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*
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* @return Number of ticks delay the next CPU tick
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*/
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virtual Tick handleKvmExitException();
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/**
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* KVM failed to start the virtualized CPU
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*
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* The kvm_run data structure contains the hardware-specific error
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* code.
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*
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* @return Number of ticks delay the next CPU tick
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*/
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virtual Tick handleKvmExitFailEntry();
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/** @} */
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/**
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* Is the architecture specific code in a state that prevents
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* draining?
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*
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* This method should return false if there are any pending events
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* in the guest vCPU that won't be carried over to the gem5 state
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* and thus will prevent correct checkpointing or CPU handover. It
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* might, for example, check for pending interrupts that have been
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* passed to the vCPU but not acknowledged by the OS. Architecures
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* implementing this method <i>must</i> override
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* kvmRunDrain().
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*
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* @see BaseKvmCPU::kvmRunDrain()
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*
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* @return true if the vCPU is drained, false otherwise.
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*/
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virtual bool archIsDrained() const { return true; }
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/**
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* Inject a memory mapped IO request into gem5
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*
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* @param paddr Physical address
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* @param data Pointer to the source/destination buffer
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* @param size Memory access size
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* @param write True if write, False if read
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* @return Number of ticks spent servicing the memory access
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*/
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Tick doMMIOAccess(Addr paddr, void *data, int size, bool write);
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/** @{ */
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/**
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* Set the signal mask used in kvmRun()
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*
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* This method allows the signal mask of the thread executing
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* kvmRun() to be overridden inside the actual system call. This
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* allows us to mask timer signals used to force KVM exits while
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* in gem5.
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*
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* The signal mask can be disabled by setting it to NULL.
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*
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* @param mask Signals to mask
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*/
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void setSignalMask(const sigset_t *mask);
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/** @} */
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/**
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* @addtogroup KvmIoctl
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* @{
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*/
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/**
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* vCPU ioctl interface.
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*
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* @param request KVM vCPU request
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* @param p1 Optional request parameter
|
|
*
|
|
* @return -1 on error (error number in errno), ioctl dependent
|
|
* value otherwise.
|
|
*/
|
|
int ioctl(int request, long p1) const;
|
|
int ioctl(int request, void *p1) const {
|
|
return ioctl(request, (long)p1);
|
|
}
|
|
int ioctl(int request) const {
|
|
return ioctl(request, 0L);
|
|
}
|
|
/** @} */
|
|
|
|
|
|
/**
|
|
* KVM memory port. Uses the default MasterPort behavior, but
|
|
* panics on timing accesses.
|
|
*/
|
|
class KVMCpuPort : public MasterPort
|
|
{
|
|
|
|
public:
|
|
KVMCpuPort(const std::string &_name, BaseKvmCPU *_cpu)
|
|
: MasterPort(_name, _cpu)
|
|
{ }
|
|
|
|
protected:
|
|
bool recvTimingResp(PacketPtr pkt)
|
|
{
|
|
panic("The KVM CPU doesn't expect recvTimingResp!\n");
|
|
return true;
|
|
}
|
|
|
|
void recvRetry()
|
|
{
|
|
panic("The KVM CPU doesn't expect recvRetry!\n");
|
|
}
|
|
|
|
};
|
|
|
|
/** Port for data requests */
|
|
KVMCpuPort dataPort;
|
|
|
|
/** Unused dummy port for the instruction interface */
|
|
KVMCpuPort instPort;
|
|
|
|
/**
|
|
* Is the gem5 context dirty? Set to true to force an update of
|
|
* the KVM vCPU state upon the next call to kvmRun().
|
|
*/
|
|
bool threadContextDirty;
|
|
|
|
/**
|
|
* Is the KVM state dirty? Set to true to force an update of
|
|
* the KVM vCPU state upon the next call to kvmRun().
|
|
*/
|
|
bool kvmStateDirty;
|
|
|
|
/** KVM internal ID of the vCPU */
|
|
const long vcpuID;
|
|
|
|
/** ID of the vCPU thread */
|
|
pthread_t vcpuThread;
|
|
|
|
private:
|
|
struct TickEvent : public Event
|
|
{
|
|
BaseKvmCPU &cpu;
|
|
|
|
TickEvent(BaseKvmCPU &c)
|
|
: Event(CPU_Tick_Pri), cpu(c) {}
|
|
|
|
void process() { cpu.tick(); }
|
|
|
|
const char *description() const {
|
|
return "BaseKvmCPU tick";
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Service MMIO requests in the mmioRing.
|
|
*
|
|
*
|
|
* @return Number of ticks spent servicing the MMIO requests in
|
|
* the MMIO ring buffer
|
|
*/
|
|
Tick flushCoalescedMMIO();
|
|
|
|
/**
|
|
* Setup a signal handler to catch the timer signal used to
|
|
* switch back to the monitor.
|
|
*/
|
|
void setupSignalHandler();
|
|
|
|
/**
|
|
* Discard a (potentially) pending signal.
|
|
*
|
|
* @param signum Signal to discard
|
|
* @return true if the signal was pending, false otherwise.
|
|
*/
|
|
bool discardPendingSignal(int signum) const;
|
|
|
|
/**
|
|
* Thread-specific initialization.
|
|
*
|
|
* Some KVM-related initialization requires us to know the TID of
|
|
* the thread that is going to execute our event queue. For
|
|
* example, when setting up timers, we need to know the TID of the
|
|
* thread executing in KVM in order to deliver the timer signal to
|
|
* that thread. This method is called as the first event in this
|
|
* SimObject's event queue.
|
|
*
|
|
* @see startup
|
|
*/
|
|
void startupThread();
|
|
|
|
/** Try to drain the CPU if a drain is pending */
|
|
bool tryDrain();
|
|
|
|
/** Execute the KVM_RUN ioctl */
|
|
void ioctlRun();
|
|
|
|
/** KVM vCPU file descriptor */
|
|
int vcpuFD;
|
|
/** Size of MMAPed kvm_run area */
|
|
int vcpuMMapSize;
|
|
/**
|
|
* Pointer to the kvm_run structure used to communicate parameters
|
|
* with KVM.
|
|
*
|
|
* @note This is the base pointer of the MMAPed KVM region. The
|
|
* first page contains the kvm_run structure. Subsequent pages may
|
|
* contain other data such as the MMIO ring buffer.
|
|
*/
|
|
struct kvm_run *_kvmRun;
|
|
/**
|
|
* Coalesced MMIO ring buffer. NULL if coalesced MMIO is not
|
|
* supported.
|
|
*/
|
|
struct kvm_coalesced_mmio_ring *mmioRing;
|
|
/** Cached page size of the host */
|
|
const long pageSize;
|
|
|
|
TickEvent tickEvent;
|
|
|
|
/**
|
|
* Setup an instruction break if there is one pending.
|
|
*
|
|
* Check if there are pending instruction breaks in the CPU's
|
|
* instruction event queue and schedule an instruction break using
|
|
* PerfEvent.
|
|
*
|
|
* @note This method doesn't currently handle the main system
|
|
* instruction event queue.
|
|
*/
|
|
void setupInstStop();
|
|
|
|
/** @{ */
|
|
/** Setup hardware performance counters */
|
|
void setupCounters();
|
|
|
|
/**
|
|
* Setup the guest instruction counter.
|
|
*
|
|
* Setup the guest instruction counter and optionally request a
|
|
* signal every N instructions executed by the guest. This method
|
|
* will re-attach the counter if the counter has already been
|
|
* attached and its sampling settings have changed.
|
|
*
|
|
* @param period Signal period, set to 0 to disable signaling.
|
|
*/
|
|
void setupInstCounter(uint64_t period = 0);
|
|
|
|
/** Currently active instruction count breakpoint */
|
|
uint64_t activeInstPeriod;
|
|
|
|
/**
|
|
* Guest cycle counter.
|
|
*
|
|
* This is the group leader of all performance counters measuring
|
|
* the guest system. It can be used in conjunction with the
|
|
* PerfKvmTimer (see perfControlledByTimer) to trigger exits from
|
|
* KVM.
|
|
*/
|
|
PerfKvmCounter hwCycles;
|
|
|
|
/**
|
|
* Guest instruction counter.
|
|
*
|
|
* This counter is typically only used to measure the number of
|
|
* instructions executed by the guest. However, it can also be
|
|
* used to trigger exits from KVM if the configuration script
|
|
* requests an exit after a certain number of instructions.
|
|
*
|
|
* @see setupInstBreak
|
|
* @see scheduleInstStop
|
|
*/
|
|
PerfKvmCounter hwInstructions;
|
|
|
|
/**
|
|
* Does the runTimer control the performance counters?
|
|
*
|
|
* The run timer will automatically enable and disable performance
|
|
* counters if a PerfEvent-based timer is used to control KVM
|
|
* exits.
|
|
*/
|
|
bool perfControlledByTimer;
|
|
/** @} */
|
|
|
|
/**
|
|
* Timer used to force execution into the monitor after a
|
|
* specified number of simulation tick equivalents have executed
|
|
* in the guest. This counter generates the signal specified by
|
|
* KVM_TIMER_SIGNAL.
|
|
*/
|
|
std::unique_ptr<BaseKvmTimer> runTimer;
|
|
|
|
/** Host factor as specified in the configuration */
|
|
float hostFactor;
|
|
|
|
/**
|
|
* Drain manager to use when signaling drain completion
|
|
*
|
|
* This pointer is non-NULL when draining and NULL otherwise.
|
|
*/
|
|
DrainManager *drainManager;
|
|
|
|
public:
|
|
/* @{ */
|
|
Stats::Scalar numInsts;
|
|
Stats::Scalar numVMExits;
|
|
Stats::Scalar numVMHalfEntries;
|
|
Stats::Scalar numExitSignal;
|
|
Stats::Scalar numMMIO;
|
|
Stats::Scalar numCoalescedMMIO;
|
|
Stats::Scalar numIO;
|
|
Stats::Scalar numHalt;
|
|
Stats::Scalar numInterrupts;
|
|
Stats::Scalar numHypercalls;
|
|
/* @} */
|
|
|
|
/** Number of instructions executed by the CPU */
|
|
Counter ctrInsts;
|
|
};
|
|
|
|
#endif
|