KVM VM container. More...

#include <vm.hh>

Inheritance diagram for gem5::KvmVM:

Classes
class	MemorySlot
	Structures tracking memory slots. More...

struct	MemSlot

Public Member Functions
	KvmVM (const KvmVMParams &params)

virtual	~KvmVM ()

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

void	setTSSAddress (Addr tss_address)
	Setup a shared three-page memory region used by the internals of KVM.

void	createIRQChip ()
	Create an in-kernel interrupt controller.

void	setIRQLine (uint32_t irq, bool high)
	Set the status of an IRQ line using KVM_IRQ_LINE.

bool	hasKernelIRQChip () const
	Is in-kernel IRQ chip emulation enabled?

void	enableKernelIRQChip ()
	Tell the VM and VCPUs to use an in-kernel IRQ chip for interrupt delivery.

const MemSlot	allocMemSlot (uint64_t size)
	Allocate a memory slot within the VM.

void	setupMemSlot (const MemSlot slot, void *host_addr, Addr guest_addr, uint32_t flags)
	Setup a region of physical memory in the guest.

void	disableMemSlot (const MemSlot slot)
	Disable a memory slot.

void	freeMemSlot (const MemSlot slot)
	Free a previously allocated memory slot.

int	createDevice (uint32_t type, uint32_t flags=0)
	Create an in-kernel device model.

bool	validEnvironment () const
	Verify gem5 configuration will support KVM emulation.

long	contextIdToVCpuId (ContextID ctx) const
	Get the VCPUID for a given context.


void	coalesceMMIO (Addr start, int size)
	Request coalescing MMIO for a memory range.

void	coalesceMMIO (const AddrRange &range)
	Request coalescing MMIO for a memory range.

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

	SimObject (const Params &p)

virtual	~SimObject ()

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

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	regProbePoints ()
	Register probe points for this object.

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

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

virtual Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID)
	Get a port with a given name and index.

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

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	regStats ()
	Callback to set stat parameters.

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 Attributes
Kvm *	kvm
	Global KVM interface.

Protected Member Functions
void	cpuStartup ()
	VM CPU initialization code.

void	delayedStartup ()
	Delayed initialization, executed once before the first CPU starts.

int	createVCPU (long vcpuID)
	Create a new vCPU within a VM.

long	allocVCPUID ()
	Allocate a new vCPU ID within the VM.

int	ioctl (int request, long p1) const
	KVM VM ioctl interface.

int	ioctl (int request, void *p1) const

int	ioctl (int request) const


void	setUserMemoryRegion (uint32_t slot, void *host_addr, Addr guest_addr, uint64_t len, uint32_t flags)
	Setup a region of physical memory in the guest.

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

virtual	~Drainable ()

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

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

Private Member Functions
	KvmVM (const KvmVM &vm)

KvmVM &	operator= (const KvmVM &vm)

Private Attributes
System *	system

int	vmFD
	KVM VM file descriptor.

bool	started
	Has delayedStartup() already been called?

bool	_hasKernelIRQChip
	Do we have in-kernel IRQ-chip emulation enabled?

long	nextVCPUID
	Next unallocated vCPU ID.

std::vector< MemorySlot >	memorySlots

uint32_t	maxMemorySlot

Friends
class	BaseKvmCPU

Additional Inherited Members
Public Types inherited from gem5::SimObject
typedef SimObjectParams	Params

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.

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.

Detailed Description

KVM VM container.

A KVM VM container normally contains all the CPUs in a shared memory machine. The VM container handles things like physical memory and to some extent interrupts. Normally, the VM API is only used for interrupts when the PIC is emulated by the kernel, which is a feature we do not use. However, some architectures (notably ARM) use the VM interface to deliver interrupts to specific CPUs as well.

VM initialization is a bit different from that of other SimObjects. When we initialize the VM, we discover all physical memory mappings in the system. Since AbstractMem::unserialize re-maps the guests memory, we need to make sure that this is done after the memory has been re-mapped, but before the vCPUs are initialized (KVM requires memory mappings to be setup before CPUs can be created). Normally, we would just initialize the VM in init() or startup(), however, we can not use init() since this is called before AbstractMem::unserialize() and we can not use startup() since it must be called before BaseKvmCPU::startup() and the simulator framework does not guarantee call order. We therefore call cpuStartup() from BaseKvmCPU::startup() instead and execute the initialization code once when the first CPU in the VM is starting.

Definition at line 301 of file vm.hh.

Constructor & Destructor Documentation

◆ KvmVM() [1/2]

gem5::KvmVM::KvmVM ( const KvmVMParams & params )

Definition at line 316 of file vm.cc.

References gem5::Kvm::capNumMemSlots(), coalesceMMIO(), gem5::ArmISA::i, kvm, maxMemorySlot, gem5::SimObject::params(), gem5::System::setKvmVM(), and system.

◆ ~KvmVM()

gem5::KvmVM::~KvmVM ( )

virtual

Definition at line 334 of file vm.cc.

References kvm, and vmFD.

◆ KvmVM() [2/2]

gem5::KvmVM::KvmVM ( const KvmVM & vm )

private

Member Function Documentation

◆ allocMemSlot()

const KvmVM::MemSlot gem5::KvmVM::allocMemSlot ( uint64_t size )

Allocate a memory slot within the VM.

Definition at line 402 of file vm.cc.

References gem5::KvmVM::MemorySlot::active, maxMemorySlot, memorySlots, panic, gem5::KvmVM::MemorySlot::size, and gem5::KvmVM::MemorySlot::slot.

Referenced by delayedStartup().

◆ allocVCPUID()

long gem5::KvmVM::allocVCPUID ( )

protected

Allocate a new vCPU ID within the VM.

The returned vCPU ID is guaranteed to be unique within the VM. New IDs are allocated sequentially starting from 0.

Returns: ID of the new vCPU

Definition at line 585 of file vm.cc.

References nextVCPUID.

Referenced by gem5::BaseKvmCPU::init().

◆ coalesceMMIO() [1/2]

void gem5::KvmVM::coalesceMMIO	(	Addr	start,
		int	size )

Request coalescing MMIO for a memory range.

Parameters

start	Physical start address in guest
size	Size of the MMIO region

Definition at line 487 of file vm.cc.

References DPRINTF, ioctl(), and panic.

Referenced by coalesceMMIO(), and KvmVM().

◆ coalesceMMIO() [2/2]

void gem5::KvmVM::coalesceMMIO ( const AddrRange & range )

Request coalescing MMIO for a memory range.

Parameters

range Coalesced MMIO range

Definition at line 481 of file vm.cc.

References coalesceMMIO(), gem5::AddrRange::size(), and gem5::AddrRange::start().

◆ contextIdToVCpuId()

long gem5::KvmVM::contextIdToVCpuId ( ContextID ctx ) const

Get the VCPUID for a given context.

Definition at line 566 of file vm.cc.

References system, and gem5::System::threads.

Referenced by gem5::KvmKernelGicV2::readCpu(), gem5::KvmKernelGicV2::readDistributor(), gem5::KvmKernelGicV2::writeCpu(), and gem5::KvmKernelGicV2::writeDistributor().

◆ cpuStartup()

void gem5::KvmVM::cpuStartup ( )

protected

VM CPU initialization code.

This method is called from BaseKvmCPU::startup() when a CPU in the VM executes its BaseKvmCPU::startup() method. The first time method is executed on a VM, it calls the delayedStartup() method.

Definition at line 358 of file vm.cc.

References delayedStartup(), and started.

Referenced by gem5::BaseKvmCPU::startup().

◆ createDevice()

int gem5::KvmVM::createDevice	(	uint32_t	type,
		uint32_t	flags = 0 )

Create an in-kernel device model.

Parameters

type	Device type (KVM_DEV_TYPE_xxx)
flags	Creation flags (KVM_CREATE_DEVICE_xxx)

Returns: Device file descriptor

Definition at line 538 of file vm.cc.

References flags, ioctl(), panic, and gem5::X86ISA::type.

◆ createVCPU()

int gem5::KvmVM::createVCPU ( long vcpuID )

protected

Create a new vCPU within a VM.

Parameters

vcpuID ID of the new CPU within the VM.

Returns: File descriptor referencing the CPU.

Definition at line 573 of file vm.cc.

References gem5::ArmISA::fd, ioctl(), and panic.

Referenced by gem5::BaseKvmCPU::startup().

◆ delayedStartup()

void gem5::KvmVM::delayedStartup ( )

protected

Delayed initialization, executed once before the first CPU starts.

This method provides a way to do VM initialization once before the first CPU in a VM starts. It is needed since some resources (e.g., memory mappings) can change in the normal SimObject::startup() path. Since the call order of SimObject::startup() is not guaranteed, we simply defer some initialization until a CPU is about to start.

Definition at line 368 of file vm.cc.

References allocMemSlot(), DPRINTF, gem5::memory::PhysicalMemory::getBackingStore(), gem5::System::getPhysMem(), hack, panic, setupMemSlot(), and system.

Referenced by cpuStartup().

◆ disableMemSlot()

void gem5::KvmVM::disableMemSlot ( const MemSlot slot )

Disable a memory slot.

Definition at line 439 of file vm.cc.

References gem5::KvmVM::MemorySlot::active, memorySlots, gem5::KvmVM::MemSlot::num, and setUserMemoryRegion().

Referenced by freeMemSlot().

◆ freeMemSlot()

void gem5::KvmVM::freeMemSlot ( const MemSlot slot )

Free a previously allocated memory slot.

Definition at line 448 of file vm.cc.

References disableMemSlot(), memorySlots, gem5::KvmVM::MemSlot::num, and gem5::KvmVM::MemorySlot::size.

◆ notifyFork()

void gem5::KvmVM::notifyFork ( )

virtual

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 344 of file vm.cc.

References kvm, vmFD, and warn.

◆ operator=()

KvmVM & gem5::KvmVM::operator= ( const KvmVM & vm )

private

◆ setTSSAddress()

void gem5::KvmVM::setTSSAddress ( Addr tss_address )

Setup a shared three-page memory region used by the internals of KVM.

This is currently only needed by x86 implementations.

Parameters

tss_address Physical address of the start of the TSS

Definition at line 503 of file vm.cc.

References ioctl(), and panic.

◆ setupMemSlot()

void gem5::KvmVM::setupMemSlot	(	const MemSlot	slot,
		void *	host_addr,
		Addr	guest_addr,
		uint32_t	flags )

Setup a region of physical memory in the guest.

Parameters

slot	KVM memory slot ID returned by allocMemSlot
host_addr	Memory allocation backing the memory
guest_addr	Address in the guest
flags	Flags (see the KVM API documentation)

Definition at line 430 of file vm.cc.

References gem5::KvmVM::MemorySlot::active, flags, memorySlots, gem5::KvmVM::MemSlot::num, setUserMemoryRegion(), and gem5::KvmVM::MemorySlot::size.

Referenced by delayedStartup().

◆ setUserMemoryRegion()

void gem5::KvmVM::setUserMemoryRegion	(	uint32_t	slot,
		void *	host_addr,
		Addr	guest_addr,
		uint64_t	len,
		uint32_t	flags )

protected

Setup a region of physical memory in the guest.

Parameters

slot	KVM memory slot ID (must be unique)
host_addr	Memory allocation backing the memory
guest_addr	Address in the guest
len	Size of the allocation in bytes
flags	Flags (see the KVM API documentation)

Definition at line 456 of file vm.cc.

References flags, ioctl(), gem5::ArmISA::len, gem5::ArmISA::m, and panic.

Referenced by disableMemSlot(), and setupMemSlot().

◆ validEnvironment()

bool gem5::KvmVM::validEnvironment ( ) const

Verify gem5 configuration will support KVM emulation.

Definition at line 555 of file vm.cc.

References system, and gem5::System::threads.

Referenced by gem5::MuxingKvmGic< Types >::drainResume(), and gem5::ArchTimerKvm::scheduleEvents().

Friends And Related Symbol Documentation

◆ BaseKvmCPU

friend class BaseKvmCPU

friend

Definition at line 303 of file vm.hh.

Member Data Documentation

◆ _hasKernelIRQChip

bool gem5::KvmVM::_hasKernelIRQChip

private

Do we have in-kernel IRQ-chip emulation enabled?

Definition at line 543 of file vm.hh.

Referenced by createIRQChip(), enableKernelIRQChip(), and hasKernelIRQChip().

◆ kvm

Kvm* gem5::KvmVM::kvm

Global KVM interface.

Definition at line 421 of file vm.hh.

Referenced by gem5::X86KvmCPU::dumpMSRs(), gem5::X86KvmCPU::getMsrIntersection(), gem5::X86KvmCPU::init(), KvmVM(), notifyFork(), gem5::KvmKernelGic::setIntState(), gem5::BaseKvmCPU::startup(), and ~KvmVM().

◆ maxMemorySlot

uint32_t gem5::KvmVM::maxMemorySlot

private

Definition at line 559 of file vm.hh.

Referenced by allocMemSlot(), and KvmVM().

◆ memorySlots

std::vector<MemorySlot> gem5::KvmVM::memorySlots

private

Definition at line 558 of file vm.hh.

Referenced by allocMemSlot(), disableMemSlot(), freeMemSlot(), and setupMemSlot().

◆ nextVCPUID

long gem5::KvmVM::nextVCPUID

private

Next unallocated vCPU ID.

Definition at line 546 of file vm.hh.

Referenced by allocVCPUID().

◆ started

bool gem5::KvmVM::started

private

Has delayedStartup() already been called?

Definition at line 540 of file vm.hh.

Referenced by cpuStartup().

◆ system

System* gem5::KvmVM::system

private

Definition at line 534 of file vm.hh.

Referenced by contextIdToVCpuId(), delayedStartup(), KvmVM(), and validEnvironment().

◆ vmFD

int gem5::KvmVM::vmFD

private

KVM VM file descriptor.

Definition at line 537 of file vm.hh.

Referenced by ioctl(), notifyFork(), and ~KvmVM().

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

cpu/kvm/vm.hh
cpu/kvm/vm.cc

Classes

Public Member Functions

Public Attributes

Protected Member Functions

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ KvmVM() [1/2]

◆ ~KvmVM()

◆ KvmVM() [2/2]

Member Function Documentation

◆ allocMemSlot()

◆ allocVCPUID()

◆ coalesceMMIO() [1/2]

◆ coalesceMMIO() [2/2]

◆ contextIdToVCpuId()

◆ cpuStartup()

◆ createDevice()

◆ createVCPU()

◆ delayedStartup()

◆ disableMemSlot()

◆ freeMemSlot()

◆ notifyFork()

◆ operator=()

◆ setTSSAddress()

◆ setupMemSlot()

◆ setUserMemoryRegion()

◆ validEnvironment()

Friends And Related Symbol Documentation

◆ BaseKvmCPU

Member Data Documentation

◆ _hasKernelIRQChip

◆ kvm

◆ maxMemorySlot

◆ memorySlots

◆ nextVCPUID

◆ started

◆ system

◆ vmFD