Base class for KVM based CPU models. More...

#include <base.hh>

Inheritance diagram for gem5::BaseKvmCPU:

Classes
class	KVMCpuPort
	KVM memory port. More...

struct	StatGroup

Public Member Functions
	BaseKvmCPU (const BaseKvmCPUParams &params)

virtual	~BaseKvmCPU ()

void	init () override
	init() is called after all C++ SimObjects have been created and all ports are connected.

void	startup () override
	startup() is the final initialization call before simulation.

void	serializeThread (CheckpointOut &cp, ThreadID tid) const override
	Serialize a single thread.

void	unserializeThread (CheckpointIn &cp, ThreadID tid) override
	Unserialize one thread.

DrainState	drain () override
	Draining is the process of clearing out the states of SimObjects.These are the SimObjects that are partially executed or are partially in flight.

void	drainResume () override
	Resume execution after a successful drain.

void	notifyFork () override
	Notify a child process of a fork.

void	switchOut () override
	Prepare for another CPU to take over execution.

void	takeOverFrom (BaseCPU *cpu) override
	Load the state of a CPU from the previous CPU object, invoked on all new CPUs that are about to be switched in.

void	verifyMemoryMode () const override
	Verify that the system is in a memory mode supported by the CPU.

Port &	getDataPort () override
	Purely virtual method that returns a reference to the data port.

Port &	getInstPort () override
	Purely virtual method that returns a reference to the instruction port.

void	wakeup (ThreadID tid=0) override

void	activateContext (ThreadID thread_num) override
	Notify the CPU that the indicated context is now active.

void	suspendContext (ThreadID thread_num) override
	Notify the CPU that the indicated context is now suspended.

void	deallocateContext (ThreadID thread_num)

void	haltContext (ThreadID thread_num) override
	Notify the CPU that the indicated context is now halted.

long	getVCpuID () const

ThreadContext *	getContext (int tn) override
	Given a thread num get tho thread context for it.

Counter	totalInsts () const override

Counter	totalOps () const override

void	finishMMIOPending ()
	Callback from KvmCPUPort to transition the CPU out of RunningMMIOPending when all timing requests have completed.

virtual void	dump () const
	Dump the internal state to the terminal.

void	kick () const
	Force an exit from KVM.

Public Member Functions inherited from gem5::BaseCPU
int	cpuId () const
	Reads this CPU's ID.

uint32_t	socketId () const
	Reads this CPU's Socket ID.

RequestorID	dataRequestorId () const
	Reads this CPU's unique data requestor ID.

RequestorID	instRequestorId () const
	Reads this CPU's unique instruction requestor ID.

Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID) override
	Get a port on this CPU.

uint32_t	taskId () const
	Get cpu task id.

void	taskId (uint32_t id)
	Set cpu task id.

uint32_t	getPid () const

void	setPid (uint32_t pid)

void	workItemBegin ()

void	workItemEnd ()

Tick	instCount ()

BaseInterrupts *	getInterruptController (ThreadID tid)

void	postInterrupt (ThreadID tid, int int_num, int index)

void	clearInterrupt (ThreadID tid, int int_num, int index)

void	clearInterrupts (ThreadID tid)

bool	checkInterrupts (ThreadID tid) const

trace::InstTracer *	getTracer ()
	Provide access to the tracer pointer.

int	findContext (ThreadContext *tc)
	Given a Thread Context pointer return the thread num.

unsigned	numContexts ()
	Get the number of thread contexts available.

ThreadID	contextToThread (ContextID cid)
	Convert ContextID to threadID.

	PARAMS (BaseCPU)

	BaseCPU (const Params &params, bool is_checker=false)

virtual	~BaseCPU ()

void	regStats () override
	Callback to set stat parameters.

void	regProbePoints () override
	Register probe points for this object.

void	registerThreadContexts ()

void	deschedulePowerGatingEvent ()

void	schedulePowerGatingEvent ()

virtual void	setReset (bool state)
	Set the reset of the CPU to be either asserted or deasserted.

void	flushTLBs ()
	Flush all TLBs in the CPU.

bool	switchedOut () const
	Determine if the CPU is switched out.

Addr	cacheLineSize () const
	Get the cache line size of the system.

void	serialize (CheckpointOut &cp) const override
	Serialize this object to the given output stream.

void	unserialize (CheckpointIn &cp) override
	Reconstruct the state of this object from a checkpoint.

void	scheduleInstStop (ThreadID tid, Counter insts, std::string cause)
	Schedule an event that exits the simulation loops after a predefined number of instructions.

void	scheduleSimpointsInstStop (std::vector< Counter > inst_starts)
	Schedule simpoint events using the scheduleInstStop function.

void	scheduleInstStopAnyThread (Counter max_insts)
	Schedule an exit event when any threads in the core reach the max_insts instructions using the scheduleInstStop function.

uint64_t	getCurrentInstCount (ThreadID tid)
	Get the number of instructions executed by the specified thread on this CPU.

void	traceFunctions (Addr pc)

void	armMonitor (ThreadID tid, Addr address)

bool	mwait (ThreadID tid, PacketPtr pkt)

void	mwaitAtomic (ThreadID tid, ThreadContext tc, BaseMMU mmu)

AddressMonitor *	getCpuAddrMonitor (ThreadID tid)

virtual void	htmSendAbortSignal (ThreadID tid, uint64_t htm_uid, HtmFailureFaultCause cause)
	This function is used to instruct the memory subsystem that a transaction should be aborted and the speculative state should be thrown away.

virtual void	probeInstCommit (const StaticInstPtr &inst, Addr pc)
	Helper method to trigger PMU probes for a committed instruction.

Public Member Functions inherited from gem5::ClockedObject
	ClockedObject (const ClockedObjectParams &p)

void	serialize (CheckpointOut &cp) const override
	Serialize an object.

void	unserialize (CheckpointIn &cp) override
	Unserialize an object.

Public Member Functions inherited from gem5::SimObject
const Params &	params () const

	SimObject (const Params &p)

virtual	~SimObject ()

virtual void	loadState (CheckpointIn &cp)
	loadState() is called on each SimObject when restoring from a checkpoint.

virtual void	initState ()
	initState() is called on each SimObject when not restoring from a checkpoint.

virtual void	regProbeListeners ()
	Register probe listeners for this object.

ProbeManager *	getProbeManager ()
	Get the probe manager for this object.

DrainState	drain () override
	Provide a default implementation of the drain interface for objects that don't need draining.

virtual void	memWriteback ()
	Write back dirty buffers to memory using functional writes.

virtual void	memInvalidate ()
	Invalidate the contents of memory buffers.

void	serialize (CheckpointOut &cp) const override
	Serialize an object.

void	unserialize (CheckpointIn &cp) override
	Unserialize an object.

Public Member Functions inherited from gem5::EventManager
EventQueue *	eventQueue () const

void	schedule (Event &event, Tick when)

void	deschedule (Event &event)

void	reschedule (Event &event, Tick when, bool always=false)

void	schedule (Event *event, Tick when)

void	deschedule (Event *event)

void	reschedule (Event *event, Tick when, bool always=false)

void	wakeupEventQueue (Tick when=(Tick) -1)
	This function is not needed by the usual gem5 event loop but may be necessary in derived EventQueues which host gem5 on other schedulers.

void	setCurTick (Tick newVal)

	EventManager (EventManager &em)
	Event manger manages events in the event queue.

	EventManager (EventManager *em)

	EventManager (EventQueue *eq)

Public Member Functions inherited from gem5::Serializable
	Serializable ()

virtual	~Serializable ()

void	serializeSection (CheckpointOut &cp, const char *name) const
	Serialize an object into a new section.

void	serializeSection (CheckpointOut &cp, const std::string &name) const

void	unserializeSection (CheckpointIn &cp, const char *name)
	Unserialize an a child object.

void	unserializeSection (CheckpointIn &cp, const std::string &name)

Public Member Functions inherited from gem5::Drainable
DrainState	drainState () const
	Return the current drain state of an object.

Public Member Functions inherited from gem5::statistics::Group
	Group (Group parent, const char name=nullptr)
	Construct a new statistics group.

virtual	~Group ()

virtual void	resetStats ()
	Callback to reset stats.

virtual void	preDumpStats ()
	Callback before stats are dumped.

void	addStat (statistics::Info *info)
	Register a stat with this group.

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object.

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object.

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block.

const Info *	resolveStat (std::string name) const
	Resolve a stat by its name within this group.

void	mergeStatGroup (Group *block)
	Merge the contents (stats & children) of a block to this block.

	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

Public Member Functions inherited from gem5::Named
	Named (const std::string &name_)

virtual	~Named ()=default

virtual std::string	name () const

Public Member Functions inherited from gem5::Clocked
void	updateClockPeriod ()
	Update the tick to the current tick.

Tick	clockEdge (Cycles cycles=Cycles(0)) const
	Determine the tick when a cycle begins, by default the current one, but the argument also enables the caller to determine a future cycle.

Cycles	curCycle () const
	Determine the current cycle, corresponding to a tick aligned to a clock edge.

Tick	nextCycle () const
	Based on the clock of the object, determine the start tick of the first cycle that is at least one cycle in the future.

uint64_t	frequency () const

Tick	clockPeriod () const

double	voltage () const

Cycles	ticksToCycles (Tick t) const

Tick	cyclesToTicks (Cycles c) const

Public Attributes
SimpleThread *	thread
	A cached copy of a thread's state in the form of a SimpleThread object.

ThreadContext *	tc
	ThreadContext object, provides an interface for external objects to modify this thread's state.

KvmVM *	vm

gem5::BaseKvmCPU::StatGroup	stats

Counter	ctrInsts
	Number of instructions executed by the CPU.

Public Attributes inherited from gem5::BaseCPU
ThreadID	numThreads
	Number of threads we're actually simulating (<= SMT_MAX_THREADS).

System *	system

gem5::BaseCPU::BaseCPUStats	baseStats

Cycles	syscallRetryLatency

std::vector< std::unique_ptr< FetchCPUStats > >	fetchStats

std::vector< std::unique_ptr< ExecuteCPUStats > >	executeStats

std::vector< std::unique_ptr< CommitCPUStats > >	commitStats

Public Attributes inherited from gem5::ClockedObject
PowerState *	powerState

Protected Types
enum	Status { Idle , Running , RunningService , RunningMMIOPending , RunningServiceCompletion }

Protected Types inherited from gem5::BaseCPU
enum	CPUState { CPU_STATE_ON , CPU_STATE_SLEEP , CPU_STATE_WAKEUP }

Protected Member Functions
void	tick ()
	Execute the CPU until the next event in the main event queue or until the guest needs service from gem5.

virtual uint64_t	getHostCycles () const
	Get the value of the hardware cycle counter in the guest.

virtual void	stutterPC (PCStateBase &pc) const =0
	Modify a PCStatePtr's value so that its next PC is the current PC.

virtual Tick	kvmRun (Tick ticks)
	Request KVM to run the guest for a given number of ticks.

virtual Tick	kvmRunDrain ()
	Request the CPU to run until draining completes.

struct kvm_run *	getKvmRunState ()
	Get a pointer to the kvm_run structure containing all the input and output parameters from kvmRun().

uint8_t *	getGuestData (uint64_t offset) const
	Retrieve a pointer to guest data stored at the end of the kvm_run structure.

void	kvmNonMaskableInterrupt ()
	Send a non-maskable interrupt to the guest.

void	kvmInterrupt (const struct kvm_interrupt &interrupt)
	Send a normal interrupt to the guest.

std::string	getAndFormatOneReg (uint64_t id) const
	Get and format one register for printout.

virtual bool	archIsDrained () const
	Is the architecture specific code in a state that prevents draining?

Tick	doMMIOAccess (Addr paddr, void *data, int size, bool write)
	Inject a memory mapped IO request into gem5.

int	ioctl (int request, long p1) const
	vCPU ioctl interface.

int	ioctl (int request, void *p1) const

int	ioctl (int request) const

virtual void	ioctlRun ()
	Execute the KVM_RUN ioctl.


void	getRegisters (struct kvm_regs &regs) const
	Get/Set the register state of the guest vCPU.

void	setRegisters (const struct kvm_regs &regs)

void	getSpecialRegisters (struct kvm_sregs &regs) const

void	setSpecialRegisters (const struct kvm_sregs &regs)


void	getFPUState (struct kvm_fpu &state) const
	Get/Set the guest FPU/vector state.

void	setFPUState (const struct kvm_fpu &state)


void	setOneReg (uint64_t id, const void *addr)
	Get/Set single register using the KVM_(SET\|GET)_ONE_REG API.

void	setOneReg (uint64_t id, uint64_t value)

void	setOneReg (uint64_t id, uint32_t value)

void	getOneReg (uint64_t id, void *addr) const

uint64_t	getOneRegU64 (uint64_t id) const

uint32_t	getOneRegU32 (uint64_t id) const


virtual void	updateKvmState ()=0
	Update the KVM state from the current thread context.

virtual void	updateThreadContext ()=0
	Update the current thread context with the KVM state.

void	syncThreadContext ()
	Update a thread context if the KVM state is dirty with respect to the cached thread context.

EventQueue *	deviceEventQueue ()
	Get a pointer to the event queue owning devices.

void	syncKvmState ()
	Update the KVM if the thread context is dirty.


virtual Tick	handleKvmExit ()
	Main kvmRun exit handler, calls the relevant handleKvmExit* depending on exit type.

virtual Tick	handleKvmExitIO ()
	The guest performed a legacy IO request (out/inp on x86)

virtual Tick	handleKvmExitHypercall ()
	The guest requested a monitor service using a hypercall.

virtual Tick	handleKvmExitIRQWindowOpen ()
	The guest exited because an interrupt window was requested.

virtual Tick	handleKvmExitUnknown ()
	An unknown architecture dependent error occurred when starting the vCPU.

virtual Tick	handleKvmExitException ()
	An unhandled virtualization exception occured.

virtual Tick	handleKvmExitFailEntry ()
	KVM failed to start the virtualized CPU.


void	setSignalMask (const sigset_t *mask)
	Set the signal mask used in kvmRun()

Protected Member Functions inherited from gem5::BaseCPU
void	updateCycleCounters (CPUState state)
	base method keeping track of cycle progression

void	enterPwrGating ()

probing::PMUUPtr	pmuProbePoint (const char *name)
	Helper method to instantiate probe points belonging to this object.

Protected Member Functions inherited from gem5::Drainable
	Drainable ()

virtual	~Drainable ()

void	signalDrainDone () const
	Signal that an object is drained.

Protected Member Functions inherited from gem5::Clocked
	Clocked (ClockDomain &clk_domain)
	Create a clocked object and set the clock domain based on the parameters.

	Clocked (Clocked &)=delete

Clocked &	operator= (Clocked &)=delete

virtual	~Clocked ()
	Virtual destructor due to inheritance.

void	resetClock () const
	Reset the object's clock using the current global tick value.

virtual void	clockPeriodUpdated ()
	A hook subclasses can implement so they can do any extra work that's needed when the clock rate is changed.

Protected Attributes
Status	_status
	CPU run state.

KVMCpuPort	dataPort
	Port for data requests.

KVMCpuPort	instPort
	Unused dummy port for the instruction interface.

const bool	alwaysSyncTC
	Be conservative and always synchronize the thread context on KVM entry/exit.

bool	threadContextDirty
	Is the gem5 context dirty? Set to true to force an update of the KVM vCPU state upon the next call to kvmRun().

bool	kvmStateDirty
	Is the KVM state dirty? Set to true to force an update of the KVM vCPU state upon the next call to kvmRun().

bool	usePerf
	True if using perf; False otherwise.

long	vcpuID
	KVM internal ID of the vCPU.

pthread_t	vcpuThread
	ID of the vCPU thread.

Protected Attributes inherited from gem5::BaseCPU
Tick	instCnt
	Instruction count used for SPARC misc register.

int	_cpuId

const uint32_t	_socketId
	Each cpu will have a socket ID that corresponds to its physical location in the system.

RequestorID	_instRequestorId
	instruction side request id that must be placed in all requests

RequestorID	_dataRequestorId
	data side request id that must be placed in all requests

uint32_t	_taskId
	An intrenal representation of a task identifier within gem5.

uint32_t	_pid
	The current OS process ID that is executing on this processor.

bool	_switchedOut
	Is the CPU switched out or active?

const Addr	_cacheLineSize
	Cache the cache line size that we get from the system.

SignalSinkPort< bool >	modelResetPort

std::vector< BaseInterrupts * >	interrupts

std::vector< ThreadContext * >	threadContexts

trace::InstTracer *	tracer

Cycles	previousCycle

CPUState	previousState

const Cycles	pwrGatingLatency

const bool	powerGatingOnIdle

EventFunctionWrapper	enterPwrGatingEvent

probing::PMUUPtr	ppRetiredInsts
	Instruction commit probe point.

probing::PMUUPtr	ppRetiredInstsPC

probing::PMUUPtr	ppRetiredLoads
	Retired load instructions.

probing::PMUUPtr	ppRetiredStores
	Retired store instructions.

probing::PMUUPtr	ppRetiredBranches
	Retired branches (any type)

probing::PMUUPtr	ppAllCycles
	CPU cycle counter even if any thread Context is suspended.

probing::PMUUPtr	ppActiveCycles
	CPU cycle counter, only counts if any thread contexts is active.

ProbePointArg< bool > *	ppSleeping
	ProbePoint that signals transitions of threadContexts sets.

Protected Attributes inherited from gem5::SimObject
const SimObjectParams &	_params
	Cached copy of the object parameters.

Protected Attributes inherited from gem5::EventManager
EventQueue *	eventq
	A pointer to this object's event queue.

Private Member Functions
Tick	flushCoalescedMMIO ()
	Service MMIO requests in the mmioRing.

void	setupSignalHandler ()
	Setup a signal handler to catch the timer signal used to switch back to the monitor.

bool	discardPendingSignal (int signum) const
	Discard a (potentially) pending signal.

void	restartEqThread ()
	Thread-specific initialization.

bool	tryDrain ()
	Try to drain the CPU if a drain is pending.

void	setupInstStop ()
	Setup an instruction break if there is one pending.

Private Attributes
int	vcpuFD
	KVM vCPU file descriptor.

int	vcpuMMapSize
	Size of MMAPed kvm_run area.

struct kvm_run *	_kvmRun
	Pointer to the kvm_run structure used to communicate parameters with KVM.

struct kvm_coalesced_mmio_ring *	mmioRing
	Coalesced MMIO ring buffer.

const long	pageSize
	Cached page size of the host.

EventFunctionWrapper	tickEvent

std::unique_ptr< BaseKvmTimer >	runTimer
	Timer used to force execution into the monitor after a specified number of simulation tick equivalents have executed in the guest.

float	hostFactor
	Host factor as specified in the configuration.

uint64_t	activeInstPeriod
	Currently active instruction count breakpoint.

std::unique_ptr< PerfKvmCounter >	hwCycles
	Guest cycle counter.

std::unique_ptr< PerfKvmCounter >	hwInstructions
	Guest instruction counter.

bool	perfControlledByTimer
	Does the runTimer control the performance counters?

void	setupCounters ()
	Setup hardware performance counters.

void	setupInstCounter (uint64_t period=0)
	Setup the guest instruction counter.

Additional Inherited Members
Public Types inherited from gem5::ClockedObject
using	Params = ClockedObjectParams
	Parameters of ClockedObject.

Public Types inherited from gem5::SimObject
typedef SimObjectParams	Params

Static Public Member Functions inherited from gem5::BaseCPU
static int	numSimulatedCPUs ()

static Counter	numSimulatedInsts ()

static Counter	numSimulatedOps ()

Static Public Member Functions inherited from gem5::SimObject
static void	serializeAll (const std::string &cpt_dir)
	Create a checkpoint by serializing all SimObjects in the system.

static SimObject *	find (const char *name)
	Find the SimObject with the given name and return a pointer to it.

static void	setSimObjectResolver (SimObjectResolver *resolver)
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints.

static SimObjectResolver *	getSimObjectResolver ()
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints.

Static Public Member Functions inherited from gem5::Serializable
static const std::string &	currentSection ()
	Gets the fully-qualified name of the active section.

static void	generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
	Generate a checkpoint file so that the serialization can be routed to it.

Static Public Attributes inherited from gem5::BaseCPU
static const uint32_t	invldPid = std::numeric_limits<uint32_t>::max()
	Invalid or unknown Pid.

Static Protected Attributes inherited from gem5::BaseCPU
static std::unique_ptr< GlobalStats >	globalStats
	Pointer to the global stat structure.

Detailed Description

Base class for KVM based CPU models.

All architecture specific KVM implementation should inherit from this class. The most basic CPU models only need to override the updateKvmState() and updateThreadContext() methods to implement state synchronization between gem5 and KVM.

The architecture specific implementation is also responsible for delivering interrupts into the VM. This is typically done by overriding tick() and checking the thread context before entering into the VM. In order to deliver an interrupt, the implementation then calls KvmVM::setIRQLine() or BaseKvmCPU::kvmInterrupt() depending on the specifics of the underlying hardware/drivers.

Definition at line 87 of file base.hh.

Member Enumeration Documentation

◆ Status

enum gem5::BaseKvmCPU::Status

protected

Enumerator
Idle	Context not scheduled in KVM. The CPU generally enters this state when the guest execute an instruction that halts the CPU (e.g., WFI on ARM or HLT on X86) if KVM traps this instruction. Ticks are not scheduled in this state. See also suspendContext()
Running	Running normally. This is the normal run state of the CPU. KVM will be entered next time tick() is called.
RunningService	Requiring service at the beginning of the next cycle. The virtual machine has exited and requires service, tick() will call handleKvmExit() on the next cycle. The next state after running service is determined in handleKvmExit() and depends on what kind of service the guest requested: IO/MMIO (Atomic): RunningServiceCompletion IO/MMIO (Timing): RunningMMIOPending Halt: Idle Others: Running
RunningMMIOPending	Timing MMIO request in flight or stalled. The VM has requested IO/MMIO and we are in timing mode. A timing request is either stalled (and will be retried with recvReqRetry()) or it is in flight. After the timing request is complete, the CPU will transition to the RunningServiceCompletion state.
RunningServiceCompletion	Service completion in progress. The VM has requested service that requires KVM to be entered once in order to get to a consistent state. This happens in handleKvmExit() or one of its friends after IO exits. After executing tick(), the CPU will transition into the Running or RunningService state.

Definition at line 188 of file base.hh.

Constructor & Destructor Documentation

◆ BaseKvmCPU()

gem5::BaseKvmCPU::BaseKvmCPU ( const BaseKvmCPUParams & params )

Definition at line 65 of file base.cc.

References tick().

◆ ~BaseKvmCPU()

gem5::BaseKvmCPU::~BaseKvmCPU ( )

virtual

Definition at line 120 of file base.cc.

References _kvmRun, vcpuFD, and vcpuMMapSize.

Member Function Documentation

◆ activateContext()

void gem5::BaseKvmCPU::activateContext ( ThreadID thread_num )

overridevirtual

Notify the CPU that the indicated context is now active.

Reimplemented from gem5::BaseCPU.

Definition at line 517 of file base.cc.

References _status, gem5::BaseCPU::baseStats, gem5::Clocked::clockEdge(), DPRINTF, Idle, gem5::ThreadState::lastActivate, gem5::ThreadState::lastSuspend, gem5::BaseCPU::BaseCPUStats::numCycles, Running, gem5::EventManager::schedule(), gem5::Event::scheduled(), thread, tickEvent, and gem5::Clocked::ticksToCycles().

◆ archIsDrained()

virtual bool gem5::BaseKvmCPU::archIsDrained ( ) const

inlineprotectedvirtual

Is the architecture specific code in a state that prevents draining?

This method should return false if there are any pending events in the guest vCPU that won't be carried over to the gem5 state and thus will prevent correct checkpointing or CPU handover. It might, for example, check for pending interrupts that have been passed to the vCPU but not acknowledged by the OS. Architecures implementing this method must override kvmRunDrain().

See also: BaseKvmCPU::kvmRunDrain()

Returns: true if the vCPU is drained, false otherwise.

Reimplemented in gem5::X86KvmCPU.

Definition at line 541 of file base.hh.

Referenced by drain(), and tryDrain().

◆ deallocateContext()

void gem5::BaseKvmCPU::deallocateContext ( ThreadID thread_num )

Definition at line 559 of file base.cc.

References suspendContext().

◆ deviceEventQueue()

EventQueue * gem5::BaseKvmCPU::deviceEventQueue ( )

inlineprotected

Get a pointer to the event queue owning devices.

Devices always live in a separate device event queue when running in multi-core mode. We need to temporarily migrate to this queue when accessing devices. By convention, devices and the VM use the same event queue.

Definition at line 447 of file base.hh.

References gem5::EventManager::eventQueue(), and vm.

Referenced by doMMIOAccess(), gem5::X86KvmCPU::handleKvmExitIO(), gem5::ArmV8KvmCPU::updateKvmState(), and gem5::ArmV8KvmCPU::updateThreadContext().

◆ discardPendingSignal()

bool gem5::BaseKvmCPU::discardPendingSignal ( int signum ) const

private

Discard a (potentially) pending signal.

Parameters

signum Signal to discard

Returns: true if the signal was pending, false otherwise.

Definition at line 1268 of file base.cc.

References panic.

Referenced by kvmRun().

◆ doMMIOAccess()

Tick gem5::BaseKvmCPU::doMMIOAccess	(	Addr	paddr,
		void *	data,
		int	size,
		bool	write )

protected

Inject a memory mapped IO request into gem5.

Parameters

paddr	Physical address
data	Pointer to the source/destination buffer
size	Memory access size
write	True if write, False if read

Returns: Number of ticks spent servicing the memory access

Definition at line 1114 of file base.cc.

References gem5::Clocked::clockPeriod(), gem5::PCStateBase::clone(), gem5::ThreadContext::contextId(), data, dataPort, gem5::BaseCPU::dataRequestorId(), deviceEventQueue(), gem5::BaseMMU::finalizePhysical(), gem5::ThreadContext::getMMUPtr(), gem5::SimpleThread::getTC(), gem5::NoFault, gem5::MipsISA::pc, gem5::ThreadContext::pcState(), gem5::BaseMMU::Read, gem5::MemCmd::ReadReq, stutterPC(), gem5::BaseKvmCPU::KVMCpuPort::submitIO(), syncThreadContext(), tc, thread, threadContextDirty, gem5::Request::UNCACHEABLE, warn, gem5::BaseMMU::Write, and gem5::MemCmd::WriteReq.

Referenced by flushCoalescedMMIO(), and handleKvmExit().

◆ drain()

DrainState gem5::BaseKvmCPU::drain ( )

overridevirtual

Draining is the process of clearing out the states of SimObjects.These are the SimObjects that are partially executed or are partially in flight.

Draining is mostly used before forking and creating a check point.

This function notifies an object that it needs to drain its state.

If the object does not need further simulation to drain internal buffers, it returns DrainState::Drained and automatically switches to the Drained state. If the object needs more simulation, it returns DrainState::Draining and automatically enters the Draining state. Other return values are invalid.

Note: An object that has entered the Drained state can be disturbed by other objects in the system and consequently stop being drained. These perturbations are not visible in the drain state. The simulator therefore repeats the draining process until all objects return DrainState::Drained on the first call to drain().

Returns: DrainState::Drained if the object is drained at this point in time, DrainState::Draining if it needs further simulation.

Implements gem5::Drainable.

Definition at line 328 of file base.cc.

References _status, archIsDrained(), gem5::EventManager::deschedule(), DPRINTF, gem5::Drained, gem5::Draining, gem5::EventManager::eventQueue(), Idle, gem5::X86ISA::lock, panic, Running, RunningMMIOPending, RunningService, RunningServiceCompletion, gem5::Event::scheduled(), gem5::BaseCPU::switchedOut(), syncThreadContext(), and tickEvent.

◆ drainResume()

void gem5::BaseKvmCPU::drainResume ( )

overridevirtual

Resume execution after a successful drain.

Reimplemented from gem5::Drainable.

Definition at line 399 of file base.cc.

References _status, gem5::ThreadContext::Active, gem5::curTick(), DPRINTF, Idle, gem5::Named::name(), gem5::Clocked::nextCycle(), restartEqThread(), Running, gem5::EventManager::schedule(), gem5::Event::scheduled(), gem5::ThreadContext::status(), gem5::BaseCPU::switchedOut(), tc, tickEvent, and verifyMemoryMode().

◆ dump()

void gem5::BaseKvmCPU::dump ( ) const

virtual

Dump the internal state to the terminal.

Reimplemented in gem5::ArmV8KvmCPU, and gem5::X86KvmCPU.

Definition at line 596 of file base.cc.

References inform.

Referenced by handleKvmExit(), handleKvmExitException(), handleKvmExitFailEntry(), handleKvmExitUnknown(), and serializeThread().

◆ finishMMIOPending()

void gem5::BaseKvmCPU::finishMMIOPending ( )

Callback from KvmCPUPort to transition the CPU out of RunningMMIOPending when all timing requests have completed.

Definition at line 242 of file base.cc.

References _status, gem5::Clocked::nextCycle(), RunningMMIOPending, RunningServiceCompletion, gem5::EventManager::schedule(), gem5::Event::scheduled(), and tickEvent.

◆ flushCoalescedMMIO()

Tick gem5::BaseKvmCPU::flushCoalescedMMIO ( )

private

Service MMIO requests in the mmioRing.

Returns: Number of ticks spent servicing the MMIO requests in the MMIO ring buffer

Definition at line 1197 of file base.cc.

References doMMIOAccess(), DPRINTF, mmioRing, gem5::BaseKvmCPU::StatGroup::numCoalescedMMIO, and stats.

Referenced by kvmRun().

◆ getAndFormatOneReg()

std::string gem5::BaseKvmCPU::getAndFormatOneReg ( uint64_t id ) const

protected

Get and format one register for printout.

This function call getOneReg() to retrieve the contents of one register and automatically formats it for printing.

Note: The presence of this call depends on Kvm::capOneReg().

Definition at line 919 of file base.cc.

References panic, and gem5::ArmISA::ss.

Referenced by gem5::ArmV8KvmCPU::dump(), gem5::ArmKvmCPU::dumpKvmStateCoProc(), gem5::ArmKvmCPU::dumpKvmStateMisc(), gem5::ArmKvmCPU::dumpKvmStateVFP(), gem5::ArmV8KvmCPU::updateKvmState(), and gem5::ArmV8KvmCPU::updateThreadContext().

◆ getContext()

ThreadContext * gem5::BaseKvmCPU::getContext ( int tn )

overridevirtual

Given a thread num get tho thread context for it.

Reimplemented from gem5::BaseCPU.

Definition at line 574 of file base.cc.

References syncThreadContext(), and tc.

◆ getDataPort()

Port & gem5::BaseKvmCPU::getDataPort ( )

inlineoverridevirtual

Purely virtual method that returns a reference to the data port.

All subclasses must implement this method.

Returns: a reference to the data port

Implements gem5::BaseCPU.

Definition at line 108 of file base.hh.

References dataPort.

◆ getFPUState()

void gem5::BaseKvmCPU::getFPUState ( struct kvm_fpu & state ) const

protected

Get/Set the guest FPU/vector state.

Definition at line 870 of file base.cc.

References ioctl(), panic, and state.

Referenced by gem5::X86KvmCPU::dumpFpuRegs(), and gem5::X86KvmCPU::updateThreadContext().

◆ getGuestData()

uint8_t * gem5::BaseKvmCPU::getGuestData ( uint64_t offset ) const

inlineprotected

Retrieve a pointer to guest data stored at the end of the kvm_run structure.

This is mainly used for PIO operations (KVM_EXIT_IO).

Parameters

offset Offset as specified by the kvm_run structure

Returns: Pointer to guest data

Definition at line 327 of file base.hh.

References _kvmRun, and gem5::ArmISA::offset.

Referenced by gem5::X86KvmCPU::handleIOMiscReg32(), and gem5::X86KvmCPU::handleKvmExitIO().

◆ getHostCycles()

uint64_t gem5::BaseKvmCPU::getHostCycles ( ) const

protectedvirtual

Get the value of the hardware cycle counter in the guest.

This method is supposed to return the total number of cycles executed in hardware mode relative to some arbitrary point in the past. It's mainly used when estimating the number of cycles actually executed by the CPU in kvmRun(). The default behavior of this method is to use the cycles performance counter, but some architectures may want to use internal registers instead.

Returns: Number of host cycles executed relative to an undefined point in the past.

Reimplemented in gem5::X86KvmCPU.

Definition at line 712 of file base.cc.

References hwCycles, and usePerf.

Referenced by kvmRun().

◆ getInstPort()

Port & gem5::BaseKvmCPU::getInstPort ( )

inlineoverridevirtual

Purely virtual method that returns a reference to the instruction port.

All subclasses must implement this method.

Returns: a reference to the instruction port

Implements gem5::BaseCPU.

Definition at line 109 of file base.hh.

References instPort.

◆ getKvmRunState()

struct kvm_run * gem5::BaseKvmCPU::getKvmRunState ( )

inlineprotected

Get a pointer to the kvm_run structure containing all the input and output parameters from kvmRun().

Definition at line 317 of file base.hh.

References _kvmRun.

Referenced by gem5::X86KvmCPU::handleIOMiscReg32(), gem5::X86KvmCPU::handleKvmExitIO(), gem5::X86KvmCPU::ioctlRun(), gem5::BaseArmKvmCPU::kvmRun(), gem5::X86KvmCPU::kvmRun(), gem5::X86KvmCPU::kvmRunDrain(), and gem5::X86KvmCPU::updateThreadContextSRegs().

◆ getOneReg()

void gem5::BaseKvmCPU::getOneReg	(	uint64_t	id,
		void *	addr ) const

protected

Definition at line 902 of file base.cc.

References gem5::X86ISA::addr, gem5::ArmISA::id, ioctl(), panic, and gem5::X86ISA::reg.

Referenced by getOneRegU32(), getOneRegU64(), gem5::BaseArmKvmCPU::ioctlRun(), and gem5::ArmV8KvmCPU::updateThreadContext().

◆ getOneRegU32()

uint32_t gem5::BaseKvmCPU::getOneRegU32 ( uint64_t id ) const

inlineprotected

Definition at line 395 of file base.hh.

References getOneReg().

Referenced by gem5::ArmKvmCPU::dumpKvmStateCoProc(), gem5::ArmKvmCPU::dumpKvmStateCore(), gem5::ArmKvmCPU::updateTCStateCoProc(), and gem5::ArmKvmCPU::updateTCStateCore().

◆ getOneRegU64()

uint64_t gem5::BaseKvmCPU::getOneRegU64 ( uint64_t id ) const

inlineprotected

Definition at line 390 of file base.hh.

References getOneReg().

Referenced by gem5::ArmKvmCPU::updateTCStateCoProc(), gem5::ArmKvmCPU::updateTCStateVFP(), and gem5::ArmV8KvmCPU::updateThreadContext().

◆ getRegisters()

void gem5::BaseKvmCPU::getRegisters ( struct kvm_regs & regs ) const

protected

Get/Set the register state of the guest vCPU.

KVM has two different interfaces for accessing the state of the guest CPU. One interface updates 'normal' registers and one updates 'special' registers. The distinction between special and normal registers isn't very clear and is architecture dependent.

Definition at line 842 of file base.cc.

References ioctl(), and panic.

Referenced by gem5::X86KvmCPU::dumpIntRegs(), and gem5::X86KvmCPU::updateThreadContext().

◆ getSpecialRegisters()

void gem5::BaseKvmCPU::getSpecialRegisters ( struct kvm_sregs & regs ) const

protected

Definition at line 856 of file base.cc.

References ioctl(), and panic.

Referenced by gem5::X86KvmCPU::dumpSpecRegs(), and gem5::X86KvmCPU::updateThreadContext().

◆ getVCpuID()

long gem5::BaseKvmCPU::getVCpuID ( ) const

inline

Definition at line 117 of file base.hh.

References vcpuID.

◆ haltContext()

void gem5::BaseKvmCPU::haltContext ( ThreadID thread_num )

overridevirtual

Notify the CPU that the indicated context is now halted.

Reimplemented from gem5::BaseCPU.

Definition at line 566 of file base.cc.

References gem5::BaseCPU::CPU_STATE_SLEEP, suspendContext(), and gem5::BaseCPU::updateCycleCounters().

◆ handleKvmExit()

Tick gem5::BaseKvmCPU::handleKvmExit ( )

protectedvirtual

Main kvmRun exit handler, calls the relevant handleKvmExit* depending on exit type.

Returns: Number of ticks spent servicing the exit request

Definition at line 990 of file base.cc.

References _kvmRun, _status, dataPort, doMMIOAccess(), DPRINTF, dump(), handleKvmExitException(), handleKvmExitFailEntry(), handleKvmExitHypercall(), handleKvmExitIO(), handleKvmExitIRQWindowOpen(), handleKvmExitUnknown(), Idle, gem5::BaseKvmCPU::KVMCpuPort::nextIOState(), gem5::BaseKvmCPU::StatGroup::numHalt, gem5::BaseKvmCPU::StatGroup::numHypercalls, gem5::BaseKvmCPU::StatGroup::numIO, gem5::BaseKvmCPU::StatGroup::numMMIO, panic, Running, RunningService, stats, gem5::SimpleThread::suspend(), and thread.

Referenced by tick().

◆ handleKvmExitException()

Tick gem5::BaseKvmCPU::handleKvmExitException ( )

protectedvirtual

An unhandled virtualization exception occured.

Some KVM virtualization drivers return unhandled exceptions to the user-space monitor. This interface is currently only used by the Intel VMX KVM driver.

Returns: Number of ticks delay the next CPU tick

Definition at line 1097 of file base.cc.

References _kvmRun, dump(), and panic.

Referenced by handleKvmExit().

◆ handleKvmExitFailEntry()

Tick gem5::BaseKvmCPU::handleKvmExitFailEntry ( )

protectedvirtual

KVM failed to start the virtualized CPU.

The kvm_run data structure contains the hardware-specific error code.

Returns: Number of ticks delay the next CPU tick

Definition at line 1106 of file base.cc.

References _kvmRun, dump(), and panic.

Referenced by handleKvmExit().

◆ handleKvmExitHypercall()

Tick gem5::BaseKvmCPU::handleKvmExitHypercall ( )

protectedvirtual

The guest requested a monitor service using a hypercall.

Returns: Number of ticks spent servicing the hypercall

Definition at line 1075 of file base.cc.

References panic.

Referenced by handleKvmExit().

◆ handleKvmExitIO()

Tick gem5::BaseKvmCPU::handleKvmExitIO ( )

protectedvirtual

The guest performed a legacy IO request (out/inp on x86)

Returns: Number of ticks spent servicing the IO request

Reimplemented in gem5::X86KvmCPU.

Definition at line 1067 of file base.cc.

References _kvmRun, and panic.

Referenced by handleKvmExit().

◆ handleKvmExitIRQWindowOpen()

Tick gem5::BaseKvmCPU::handleKvmExitIRQWindowOpen ( )

protectedvirtual

The guest exited because an interrupt window was requested.

The guest exited because an interrupt window was requested (request_interrupt_window in the kvm_run structure was set to 1 before calling kvmRun) and it is now ready to receive

Returns: Number of ticks spent servicing the IRQ

Reimplemented in gem5::X86KvmCPU.

Definition at line 1081 of file base.cc.

References warn.

Referenced by handleKvmExit().

◆ handleKvmExitUnknown()

Tick gem5::BaseKvmCPU::handleKvmExitUnknown ( )

protectedvirtual

An unknown architecture dependent error occurred when starting the vCPU.

The kvm_run data structure contains the hardware error code. The defaults behavior of this method just prints the HW error code and panics. Architecture dependent implementations may want to override this method to provide better, hardware-aware, error messages.

Returns: Number of ticks delay the next CPU tick

Definition at line 1089 of file base.cc.

References _kvmRun, dump(), and panic.

Referenced by handleKvmExit().

◆ init()

void gem5::BaseKvmCPU::init ( )

overridevirtual

init() is called after all C++ SimObjects have been created and all ports are connected.

Initializations that are independent of unserialization but rely on a fully instantiated and connected SimObject graph should be done here.

Reimplemented from gem5::BaseCPU.

Reimplemented in gem5::X86KvmCPU.

Definition at line 128 of file base.cc.

References gem5::KvmVM::allocVCPUID(), fatal_if, gem5::System::getKvmVM(), gem5::BaseCPU::init(), gem5::BaseCPU::numThreads, gem5::BaseCPU::system, vcpuID, and vm.

Referenced by gem5::X86KvmCPU::init(), gem5::ArmKvmCPU::kvmArmVCpuInit(), gem5::ArmKvmCPU::kvmArmVCpuInit(), and gem5::BaseArmKvmCPU::kvmArmVCpuInit().

◆ ioctlRun()

void gem5::BaseKvmCPU::ioctlRun ( )

protectedvirtual

Execute the KVM_RUN ioctl.

Reimplemented in gem5::BaseArmKvmCPU, and gem5::X86KvmCPU.

Definition at line 1355 of file base.cc.

References ioctl(), and panic.

Referenced by gem5::BaseArmKvmCPU::ioctlRun(), gem5::X86KvmCPU::ioctlRun(), and kvmRun().

◆ kick()

void gem5::BaseKvmCPU::kick ( ) const

inline

Force an exit from KVM.

Send a signal to the thread owning this vCPU to get it to exit from KVM. Ignored if the vCPU is not executing.

Definition at line 138 of file base.hh.

References KVM_KICK_SIGNAL, and vcpuThread.

Referenced by kvmRun(), and wakeup().

◆ kvmRun()

Tick gem5::BaseKvmCPU::kvmRun ( Tick ticks )

protectedvirtual

Request KVM to run the guest for a given number of ticks.

The method returns the approximate number of ticks executed.

Note: The returned number of ticks can be both larger or smaller than the requested number of ticks. A smaller number can, for example, occur when the guest executes MMIO. A larger number is typically due to performance counter inaccuracies.; This method is virtual in order to allow implementations to check for architecture specific events (e.g., interrupts) before entering the VM.; It is the response of the caller (normally tick()) to make sure that the KVM state is synchronized and that the TC is invalidated after entering KVM.; This method does not normally cause any state transitions. However, if it may suspend the CPU by suspending the thread, which leads to a transition to the Idle state. In such a case, kvm must not be entered.

Parameters

ticks Number of ticks to execute, set to 0 to exit immediately after finishing pending operations.

Returns: Number of ticks executed (see note)

Reimplemented in gem5::ArmKvmCPU, gem5::BaseArmKvmCPU, and gem5::X86KvmCPU.

Definition at line 720 of file base.cc.

References gem5::BaseCPU::baseStats, gem5::Clocked::clockPeriod(), gem5::BaseCPU::commitStats, ctrInsts, gem5::curEventQueue(), discardPendingSignal(), DPRINTF, fatal_if, flushCoalescedMMIO(), getHostCycles(), hostFactor, hwCycles, hwInstructions, ioctlRun(), kick(), KVM_KICK_SIGNAL, gem5::BaseCPU::BaseCPUStats::numCycles, gem5::BaseCPU::BaseCPUStats::numInsts, gem5::BaseKvmCPU::StatGroup::numVMExits, gem5::BaseKvmCPU::StatGroup::numVMHalfEntries, perfControlledByTimer, runTimer, stats, thread, gem5::SimpleThread::threadId(), usePerf, and vcpuFD.

Referenced by gem5::ArmKvmCPU::kvmRun(), gem5::BaseArmKvmCPU::kvmRun(), gem5::X86KvmCPU::kvmRun(), kvmRunDrain(), gem5::X86KvmCPU::kvmRunDrain(), and tick().

◆ kvmRunDrain()

Tick gem5::BaseKvmCPU::kvmRunDrain ( )

protectedvirtual

Request the CPU to run until draining completes.

This function normally calls kvmRun(0) to make KVM finish pending MMIO operations. Architecures implementing archIsDrained() must override this method.

See also: BaseKvmCPU::archIsDrained()

Returns: Number of ticks executed

Reimplemented in gem5::X86KvmCPU.

Definition at line 698 of file base.cc.

References _status, kvmRun(), RunningMMIOPending, and RunningServiceCompletion.

Referenced by tick().

◆ notifyFork()

void gem5::BaseKvmCPU::notifyFork ( )

overridevirtual

Notify a child process of a fork.

SimObjects are told that the process is going to be forked.

Forking is a process of splitting a process in to two processes, which is then used for multiprocessing.

When calling fork in gem5, we need to ensure that resources shared between the parent and the child are consistent. This method is intended to be overloaded to handle that. For example, an object could use this method to re-open input files to get a separate file description with a private file offset.

This method is only called in the child of the fork. The call takes place in a drained system.

Reimplemented from gem5::Drainable.

Definition at line 429 of file base.cc.

References _kvmRun, _status, hwCycles, hwInstructions, Idle, gem5::Event::scheduled(), tickEvent, usePerf, vcpuFD, vcpuMMapSize, and warn.

◆ restartEqThread()

void gem5::BaseKvmCPU::restartEqThread ( )

private

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 and after drainResume to handle changes to event queue service threads.

See also: startup

Definition at line 252 of file base.cc.

References hwCycles, KVM_KICK_SIGNAL, gem5::MipsISA::p, gem5::SimObject::params(), runTimer, setupCounters(), setupSignalHandler(), and vcpuThread.

Referenced by drainResume(), and startup().

◆ serializeThread()

void gem5::BaseKvmCPU::serializeThread	(	CheckpointOut &	cp,
		ThreadID	tid ) const

overridevirtual

Serialize a single thread.

Parameters

cp	The stream to serialize to.
tid	ID of the current thread.

Reimplemented from gem5::BaseCPU.

Definition at line 304 of file base.cc.

References _status, DPRINTF, dump(), Idle, gem5::SimpleThread::serialize(), and thread.

◆ setFPUState()

void gem5::BaseKvmCPU::setFPUState ( const struct kvm_fpu & state )

protected

Definition at line 877 of file base.cc.

References ioctl(), panic, and state.

Referenced by gem5::X86KvmCPU::updateKvmStateFPULegacy().

◆ setOneReg() [1/3]

void gem5::BaseKvmCPU::setOneReg	(	uint64_t	id,
		const void *	addr )

protected

Get/Set single register using the KVM_(SET|GET)_ONE_REG API.

Note: The presence of this call depends on Kvm::capOneReg().

Definition at line 885 of file base.cc.

References gem5::X86ISA::addr, gem5::ArmISA::id, ioctl(), panic, and gem5::X86ISA::reg.

Referenced by gem5::BaseArmKvmCPU::ioctlRun(), gem5::ArmV8KvmCPU::startup(), gem5::ArmV8KvmCPU::updateKvmState(), gem5::ArmKvmCPU::updateKvmStateCoProc(), gem5::ArmKvmCPU::updateKvmStateCore(), and gem5::ArmKvmCPU::updateKvmStateVFP().

◆ setOneReg() [2/3]

void gem5::BaseKvmCPU::setOneReg	(	uint64_t	id,
		uint32_t	value )

inlineprotected

Definition at line 388 of file base.hh.

References setOneReg().

Referenced by setOneReg().

◆ setOneReg() [3/3]

void gem5::BaseKvmCPU::setOneReg	(	uint64_t	id,
		uint64_t	value )

inlineprotected

Definition at line 387 of file base.hh.

References setOneReg().

Referenced by setOneReg().

◆ setRegisters()

void gem5::BaseKvmCPU::setRegisters ( const struct kvm_regs & regs )

protected

Definition at line 849 of file base.cc.

References ioctl(), and panic.

Referenced by gem5::X86KvmCPU::updateKvmStateRegs().

◆ setSignalMask()

void gem5::BaseKvmCPU::setSignalMask ( const sigset_t * mask )

protected

Set the signal mask used in kvmRun()

This method allows the signal mask of the thread executing kvmRun() to be overridden inside the actual system call. This allows us to mask timer signals used to force KVM exits while in gem5.

The signal mask can be disabled by setting it to NULL.

Parameters

mask	Signals to mask

Definition at line 1166 of file base.cc.

References ioctl(), gem5::ArmISA::mask, gem5::MipsISA::p, and panic.

Referenced by setupSignalHandler().

◆ setSpecialRegisters()

void gem5::BaseKvmCPU::setSpecialRegisters ( const struct kvm_sregs & regs )

protected

Definition at line 863 of file base.cc.

References ioctl(), and panic.

Referenced by gem5::X86KvmCPU::updateKvmStateSRegs().

◆ setupCounters()

void gem5::BaseKvmCPU::setupCounters ( )

private

Setup hardware performance counters.

Definition at line 1296 of file base.cc.

References gem5::PerfKvmCounterConfig::disabled(), DPRINTF, gem5::PerfKvmCounterConfig::exclude_host(), gem5::PerfKvmCounterConfig::exclude_hv(), hwCycles, perfControlledByTimer, gem5::PerfKvmCounterConfig::pinned(), gem5::PerfKvmCounterConfig::samplePeriod(), setupInstCounter(), usePerf, and gem5::PerfKvmCounterConfig::wakeupEvents().

Referenced by restartEqThread().

◆ setupInstCounter()

void gem5::BaseKvmCPU::setupInstCounter ( uint64_t period = 0 )

private

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.

Parameters

period Signal period, set to 0 to disable signaling.

Definition at line 1377 of file base.cc.

References activeInstPeriod, gem5::PerfKvmCounterConfig::exclude_host(), gem5::PerfKvmCounterConfig::exclude_hv(), hwCycles, hwInstructions, KVM_KICK_SIGNAL, gem5::PerfKvmCounterConfig::samplePeriod(), usePerf, and gem5::PerfKvmCounterConfig::wakeupEvents().

Referenced by setupCounters(), and setupInstStop().

◆ setupInstStop()

void gem5::BaseKvmCPU::setupInstStop ( )

private

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.

Definition at line 1365 of file base.cc.

References gem5::SimpleThread::comInstEventQueue, ctrInsts, gem5::EventQueue::empty(), gem5::EventQueue::nextTick(), setupInstCounter(), and thread.

Referenced by tick().

◆ setupSignalHandler()

void gem5::BaseKvmCPU::setupSignalHandler ( )

private

Setup a signal handler to catch the timer signal used to switch back to the monitor.

Definition at line 1239 of file base.cc.

References KVM_KICK_SIGNAL, gem5::onKickSignal(), panic, gem5::ArmISA::sa, and setSignalMask().

Referenced by restartEqThread().

◆ startup()

void gem5::BaseKvmCPU::startup ( )

overridevirtual

startup() is the final initialization call before simulation.

All state is initialized (including unserialized state, if any, such as the curTick() value), so this is the appropriate place to schedule initial event(s) for objects that need them.

Reimplemented from gem5::BaseCPU.

Reimplemented in gem5::X86KvmCPU.

Definition at line 137 of file base.cc.

References _kvmRun, gem5::Kvm::capCoalescedMMIO(), gem5::KvmVM::cpuStartup(), gem5::KvmVM::createVCPU(), gem5::curTick(), gem5::Kvm::getVCPUMMapSize(), inform, gem5::KvmVM::kvm, mmioRing, gem5::Named::name(), gem5::MipsISA::p, pageSize, panic, gem5::SimObject::params(), restartEqThread(), gem5::EventManager::schedule(), gem5::BaseCPU::startup(), vcpuFD, vcpuID, vcpuMMapSize, and vm.

Referenced by gem5::ArmKvmCPU::startup(), gem5::BaseArmKvmCPU::startup(), and gem5::X86KvmCPU::startup().

◆ stutterPC()

virtual void gem5::BaseKvmCPU::stutterPC ( PCStateBase & pc ) const

protectedpure virtual

Modify a PCStatePtr's value so that its next PC is the current PC.

This needs to be implemented in KVM base classes since modifying the next PC value is an ISA specific operation. This is only used in doMMIOAccess, for reasons explained in a comment there.

Implemented in gem5::ArmKvmCPU, gem5::BaseArmKvmCPU, and gem5::X86KvmCPU.

Referenced by doMMIOAccess().

◆ suspendContext()

void gem5::BaseKvmCPU::suspendContext ( ThreadID thread_num )

overridevirtual

Notify the CPU that the indicated context is now suspended.

Check if possible to enter a lower power state

Reimplemented from gem5::BaseCPU.

Definition at line 536 of file base.cc.

References _status, gem5::EventManager::deschedule(), DPRINTF, Idle, Running, RunningServiceCompletion, gem5::Event::scheduled(), thread, and tickEvent.

Referenced by deallocateContext(), and haltContext().

◆ switchOut()

void gem5::BaseKvmCPU::switchOut ( )

overridevirtual

Prepare for another CPU to take over execution.

When this method exits, all internal state should have been flushed. After the method returns, the simulator calls takeOverFrom() on the new CPU with this CPU as its parameter.

Reimplemented from gem5::BaseCPU.

Definition at line 454 of file base.cc.

References _status, DPRINTF, Idle, gem5::Event::scheduled(), gem5::BaseCPU::switchOut(), and tickEvent.

◆ syncKvmState()

void gem5::BaseKvmCPU::syncKvmState ( )

protected

Update the KVM if the thread context is dirty.

Definition at line 978 of file base.cc.

References kvmStateDirty, threadContextDirty, and updateKvmState().

Referenced by tick().

◆ syncThreadContext()

void gem5::BaseKvmCPU::syncThreadContext ( )

protected

Update a thread context if the KVM state is dirty with respect to the cached thread context.

Definition at line 966 of file base.cc.

References kvmStateDirty, threadContextDirty, and updateThreadContext().

Referenced by gem5::X86KvmCPU::deliverInterrupts(), doMMIOAccess(), drain(), getContext(), gem5::X86KvmCPU::kvmRun(), and tick().

◆ takeOverFrom()

void gem5::BaseKvmCPU::takeOverFrom ( BaseCPU * cpu )

overridevirtual

Load the state of a CPU from the previous CPU object, invoked on all new CPUs that are about to be switched in.

A CPU model implementing this method is expected to initialize its state from the old CPU and connect its memory (unless they are already connected) to the memories connected to the old CPU.

Parameters

cpu	CPU to initialize read state from.

Reimplemented from gem5::BaseCPU.

Definition at line 468 of file base.cc.

References _status, DPRINTF, Idle, gem5::Event::scheduled(), gem5::BaseCPU::takeOverFrom(), threadContextDirty, gem5::BaseCPU::threadContexts, tickEvent, and updateKvmState().

◆ tick()

void gem5::BaseKvmCPU::tick ( )

protected

Execute the CPU until the next event in the main event queue or until the guest needs service from gem5.

Definition at line 602 of file base.cc.

References _kvmRun, _status, alwaysSyncTC, gem5::Clocked::clockEdge(), gem5::SimpleThread::comInstEventQueue, ctrInsts, gem5::curEventQueue(), gem5::curTick(), DPRINTF, gem5::Draining, gem5::Drainable::drainState(), handleKvmExit(), Idle, kvmRun(), kvmRunDrain(), kvmStateDirty, gem5::MaxTick, gem5::BaseKvmCPU::StatGroup::numExitSignal, panic, Running, RunningMMIOPending, RunningService, RunningServiceCompletion, runTimer, gem5::EventManager::schedule(), setupInstStop(), stats, syncKvmState(), syncThreadContext(), thread, threadContextDirty, tickEvent, gem5::Clocked::ticksToCycles(), and tryDrain().

Referenced by BaseKvmCPU().

◆ totalInsts()

Counter gem5::BaseKvmCPU::totalInsts ( ) const

overridevirtual

Implements gem5::BaseCPU.

Definition at line 583 of file base.cc.

References ctrInsts.

◆ totalOps()

Counter gem5::BaseKvmCPU::totalOps ( ) const

overridevirtual

Implements gem5::BaseCPU.

Definition at line 589 of file base.cc.

References ctrInsts, and hack_once.

◆ tryDrain()

bool gem5::BaseKvmCPU::tryDrain ( )

private

Try to drain the CPU if a drain is pending.

Definition at line 1333 of file base.cc.

References _status, archIsDrained(), DPRINTF, gem5::Draining, gem5::Drainable::drainState(), Idle, Running, and gem5::Drainable::signalDrainDone().

Referenced by tick().

◆ unserializeThread()

void gem5::BaseKvmCPU::unserializeThread	(	CheckpointIn &	cp,
		ThreadID	tid )

overridevirtual

Unserialize one thread.

Parameters

cp	The checkpoint use.
tid	ID of the current thread.

Reimplemented from gem5::BaseCPU.

Definition at line 317 of file base.cc.

References _status, DPRINTF, Idle, thread, threadContextDirty, and gem5::SimpleThread::unserialize().

◆ updateKvmState()

virtual void gem5::BaseKvmCPU::updateKvmState ( )

protectedpure virtual

Update the KVM state from the current thread context.

The base CPU calls this method before starting the guest CPU when the contextDirty flag is set. The architecture dependent CPU implementation is expected to update all guest state (registers, special registers, and FPU state).

Implemented in gem5::ArmKvmCPU, gem5::ArmV8KvmCPU, and gem5::X86KvmCPU.

Referenced by syncKvmState(), and takeOverFrom().

◆ updateThreadContext()

virtual void gem5::BaseKvmCPU::updateThreadContext ( )

protectedpure virtual

Update the current thread context with the KVM state.

The base CPU after the guest updates any of the KVM state. In practice, this happens after kvmRun is called. The architecture dependent code is expected to read the state of the guest CPU and update gem5's thread state.

Implemented in gem5::ArmKvmCPU, gem5::ArmV8KvmCPU, and gem5::X86KvmCPU.

Referenced by syncThreadContext().

◆ verifyMemoryMode()

void gem5::BaseKvmCPU::verifyMemoryMode ( ) const

overridevirtual

Verify that the system is in a memory mode supported by the CPU.

Implementations are expected to query the system for the current memory mode and ensure that it is what the CPU model expects. If the check fails, the implementation should terminate the simulation using fatal().

Reimplemented from gem5::BaseCPU.

Definition at line 490 of file base.cc.

References gem5::System::bypassCaches(), fatal, and gem5::BaseCPU::system.

Referenced by drainResume().

◆ wakeup()

void gem5::BaseKvmCPU::wakeup ( ThreadID tid = 0 )

overridevirtual

Implements gem5::BaseCPU.

Definition at line 499 of file base.cc.

References gem5::SimpleThread::activate(), DPRINTF, gem5::EventManager::eventQueue(), kick(), gem5::SimpleThread::status(), gem5::ThreadContext::Suspended, and thread.

Member Data Documentation

◆ _kvmRun

struct kvm_run* gem5::BaseKvmCPU::_kvmRun

private

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.

Definition at line 719 of file base.hh.

Referenced by getGuestData(), getKvmRunState(), handleKvmExit(), handleKvmExitException(), handleKvmExitFailEntry(), handleKvmExitIO(), handleKvmExitUnknown(), notifyFork(), startup(), tick(), and ~BaseKvmCPU().

◆ _status

Status gem5::BaseKvmCPU::_status

protected

CPU run state.

Definition at line 240 of file base.hh.

Referenced by activateContext(), drain(), drainResume(), finishMMIOPending(), handleKvmExit(), gem5::X86KvmCPU::kvmRun(), kvmRunDrain(), notifyFork(), serializeThread(), suspendContext(), switchOut(), takeOverFrom(), tick(), tryDrain(), and unserializeThread().

◆ activeInstPeriod

uint64_t gem5::BaseKvmCPU::activeInstPeriod

private

Currently active instruction count breakpoint.

Definition at line 759 of file base.hh.

Referenced by setupInstCounter().

◆ alwaysSyncTC

const bool gem5::BaseKvmCPU::alwaysSyncTC

protected

Be conservative and always synchronize the thread context on KVM entry/exit.

Definition at line 642 of file base.hh.

Referenced by tick().

◆ ctrInsts

Counter gem5::BaseKvmCPU::ctrInsts

Number of instructions executed by the CPU.

Definition at line 823 of file base.hh.

Referenced by kvmRun(), setupInstStop(), tick(), totalInsts(), and totalOps().

◆ dataPort

KVMCpuPort gem5::BaseKvmCPU::dataPort

protected

Port for data requests.

Definition at line 633 of file base.hh.

Referenced by doMMIOAccess(), getDataPort(), handleKvmExit(), and gem5::X86KvmCPU::handleKvmExitIO().

◆ hostFactor

float gem5::BaseKvmCPU::hostFactor

private

Host factor as specified in the configuration.

Definition at line 803 of file base.hh.

Referenced by kvmRun().

◆ hwCycles

std::unique_ptr<PerfKvmCounter> gem5::BaseKvmCPU::hwCycles

private

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.

Definition at line 769 of file base.hh.

Referenced by getHostCycles(), kvmRun(), notifyFork(), restartEqThread(), setupCounters(), and setupInstCounter().

◆ hwInstructions

std::unique_ptr<PerfKvmCounter> gem5::BaseKvmCPU::hwInstructions

private

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 also: setupInstBreak; scheduleInstStop

Definition at line 782 of file base.hh.

Referenced by kvmRun(), notifyFork(), and setupInstCounter().

◆ instPort

KVMCpuPort gem5::BaseKvmCPU::instPort

protected

Unused dummy port for the instruction interface.

Definition at line 636 of file base.hh.

Referenced by getInstPort().

◆ kvmStateDirty

bool gem5::BaseKvmCPU::kvmStateDirty

protected

Is the KVM state dirty? Set to true to force an update of the KVM vCPU state upon the next call to kvmRun().

Definition at line 654 of file base.hh.

Referenced by syncKvmState(), syncThreadContext(), and tick().

◆ mmioRing

struct kvm_coalesced_mmio_ring* gem5::BaseKvmCPU::mmioRing

private

Coalesced MMIO ring buffer.

NULL if coalesced MMIO is not supported.

Definition at line 724 of file base.hh.

Referenced by flushCoalescedMMIO(), and startup().

◆ pageSize

const long gem5::BaseKvmCPU::pageSize

private

Cached page size of the host.

Definition at line 726 of file base.hh.

Referenced by startup().

◆ perfControlledByTimer

bool gem5::BaseKvmCPU::perfControlledByTimer

private

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.

Definition at line 791 of file base.hh.

Referenced by kvmRun(), and setupCounters().

◆ runTimer

std::unique_ptr<BaseKvmTimer> gem5::BaseKvmCPU::runTimer

private

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.

Definition at line 800 of file base.hh.

Referenced by kvmRun(), restartEqThread(), and tick().

◆ stats

gem5::BaseKvmCPU::StatGroup gem5::BaseKvmCPU::stats

Referenced by flushCoalescedMMIO(), handleKvmExit(), kvmInterrupt(), kvmNonMaskableInterrupt(), kvmRun(), and tick().

◆ tc

ThreadContext* gem5::BaseKvmCPU::tc

ThreadContext object, provides an interface for external objects to modify this thread's state.

Definition at line 158 of file base.hh.

◆ thread

SimpleThread* gem5::BaseKvmCPU::thread

A cached copy of a thread's state in the form of a SimpleThread object.

Normally the actual thread state is stored in the KVM vCPU. If KVM has been running this copy is will be out of date. If we recently handled some events within gem5 that required state to be updated this could be the most up-to-date copy. When getContext() or updateThreadContext() is called this copy gets updated. The method syncThreadContext can be used within a KVM CPU to update the thread context if the KVM state is dirty (i.e., the vCPU has been run since the last update).

Definition at line 153 of file base.hh.

Referenced by activateContext(), gem5::X86KvmCPU::deliverInterrupts(), doMMIOAccess(), handleKvmExit(), kvmRun(), serializeThread(), setupInstStop(), suspendContext(), tick(), unserializeThread(), and wakeup().

◆ threadContextDirty

bool gem5::BaseKvmCPU::threadContextDirty

protected

Is the gem5 context dirty? Set to true to force an update of the KVM vCPU state upon the next call to kvmRun().

Definition at line 648 of file base.hh.

Referenced by gem5::X86KvmCPU::deliverInterrupts(), doMMIOAccess(), syncKvmState(), syncThreadContext(), takeOverFrom(), tick(), and unserializeThread().

◆ tickEvent

EventFunctionWrapper gem5::BaseKvmCPU::tickEvent

private

Definition at line 728 of file base.hh.

Referenced by activateContext(), drain(), drainResume(), finishMMIOPending(), notifyFork(), suspendContext(), switchOut(), takeOverFrom(), and tick().

◆ usePerf

bool gem5::BaseKvmCPU::usePerf

protected

True if using perf; False otherwise.

Definition at line 657 of file base.hh.

Referenced by getHostCycles(), kvmRun(), notifyFork(), setupCounters(), and setupInstCounter().

◆ vcpuFD

int gem5::BaseKvmCPU::vcpuFD

private

KVM vCPU file descriptor.

Definition at line 708 of file base.hh.

Referenced by ioctl(), kvmRun(), notifyFork(), startup(), and ~BaseKvmCPU().

◆ vcpuID

long gem5::BaseKvmCPU::vcpuID

protected

KVM internal ID of the vCPU.

Definition at line 660 of file base.hh.

Referenced by getVCpuID(), init(), gem5::ArmKvmCPU::kvmRun(), gem5::BaseArmKvmCPU::kvmRun(), and startup().

◆ vcpuMMapSize

int gem5::BaseKvmCPU::vcpuMMapSize

private

Size of MMAPed kvm_run area.

Definition at line 710 of file base.hh.

Referenced by notifyFork(), startup(), and ~BaseKvmCPU().

◆ vcpuThread

pthread_t gem5::BaseKvmCPU::vcpuThread

protected

ID of the vCPU thread.

Definition at line 663 of file base.hh.

Referenced by kick(), and restartEqThread().

◆ vm

KvmVM* gem5::BaseKvmCPU::vm

Definition at line 160 of file base.hh.

Referenced by deviceEventQueue(), gem5::X86KvmCPU::dumpMSRs(), gem5::X86KvmCPU::getMsrIntersection(), init(), gem5::X86KvmCPU::init(), gem5::ArmKvmCPU::kvmRun(), gem5::BaseArmKvmCPU::kvmRun(), gem5::BaseArmKvmCPU::startup(), and startup().

The documentation for this class was generated from the following files:

cpu/kvm/base.hh
cpu/kvm/base.cc

Classes

Public Member Functions

Public Attributes

Protected Types

Protected Member Functions

Protected Attributes

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ Status

Constructor & Destructor Documentation

◆ BaseKvmCPU()

◆ ~BaseKvmCPU()

Member Function Documentation

◆ activateContext()

◆ archIsDrained()

◆ deallocateContext()

◆ deviceEventQueue()

◆ discardPendingSignal()

◆ doMMIOAccess()

◆ drain()

◆ drainResume()

◆ dump()

◆ finishMMIOPending()

◆ flushCoalescedMMIO()

◆ getAndFormatOneReg()

◆ getContext()

◆ getDataPort()

◆ getFPUState()

◆ getGuestData()

◆ getHostCycles()

◆ getInstPort()

◆ getKvmRunState()

◆ getOneReg()

◆ getOneRegU32()

◆ getOneRegU64()

◆ getRegisters()

◆ getSpecialRegisters()

◆ getVCpuID()

◆ haltContext()

◆ handleKvmExit()

◆ handleKvmExitException()

◆ handleKvmExitFailEntry()

◆ handleKvmExitHypercall()

◆ handleKvmExitIO()

◆ handleKvmExitIRQWindowOpen()

◆ handleKvmExitUnknown()

◆ init()

◆ ioctlRun()

◆ kick()

◆ kvmRun()

◆ kvmRunDrain()

◆ notifyFork()

◆ restartEqThread()

◆ serializeThread()

◆ setFPUState()

◆ setOneReg() [1/3]

◆ setOneReg() [2/3]

◆ setOneReg() [3/3]

◆ setRegisters()

◆ setSignalMask()

◆ setSpecialRegisters()

◆ setupCounters()

◆ setupInstCounter()

◆ setupInstStop()

◆ setupSignalHandler()

◆ startup()

◆ stutterPC()

◆ suspendContext()

◆ switchOut()

◆ syncKvmState()

◆ syncThreadContext()

◆ takeOverFrom()

◆ tick()

◆ totalInsts()

◆ totalOps()

◆ tryDrain()

◆ unserializeThread()