Macro LIBVIR_VERSION_NUMBER

#define LIBVIR_VERSION_NUMBER;

Macro providing the version of the library as version * 1,000,000 + minor * 1000 + micro

Macro VIR_COPY_CPUMAP

#define VIR_COPY_CPUMAP(cpumaps, maplen, vcpu, cpumap);

This macro is to be used in conjonction with virDomainGetVcpus() and virDomainPinVcpu() APIs. VIR_COPY_CPUMAP macro extract the cpumap of the specified vcpu from cpumaps array and copy it into cpumap to be used later by virDomainPinVcpu() API.

Macro VIR_CPU_MAPLEN

#define VIR_CPU_MAPLEN;

Macro VIR_CPU_USABLE

#define VIR_CPU_USABLE(cpumaps, maplen, vcpu, cpu);

This macro is to be used in conjonction with virDomainGetVcpus() API. VIR_CPU_USABLE macro returns a non zero value (true) if the cpu is usable by the vcpu, and 0 otherwise.

Macro VIR_GET_CPUMAP

#define VIR_GET_CPUMAP(cpumaps, maplen, vcpu);

This macro is to be used in conjonction with virDomainGetVcpus() and virDomainPinVcpu() APIs. VIR_GET_CPUMAP macro returns a pointer to the cpumap of the specified vcpu from cpumaps array.

Macro VIR_NODEINFO_MAXCPUS

#define VIR_NODEINFO_MAXCPUS(nodeinfo);

This macro is to calculate the total number of CPUs supported but not neccessarily active in the host.

Macro VIR_UNUSE_CPU

#define VIR_UNUSE_CPU(cpumap, cpu);

This macro is to be used in conjonction with virDomainPinVcpu() API. USE_CPU macro reset the bit (CPU not usable) of the related cpu in cpumap.

Macro VIR_USE_CPU

#define VIR_USE_CPU(cpumap, cpu);

This macro is to be used in conjonction with virDomainPinVcpu() API. USE_CPU macro set the bit (CPU usable) of the related cpu in cpumap.

Structure virConnect

struct _virConnect {
The content of this structure is not made public by the API.
} virConnect;

Typedef virConnectPtr

virConnect * virConnectPtr;

a virConnectPtr is pointer to a virConnect private structure, this is the type used to reference a connection to the Xen Hypervisor in the API.

Enum virDeviceMode

enum virDeviceMode {
    VIR_DEVICE_DEFAULT = 0 /* Default mode */
    VIR_DEVICE_RO = 1 /* Access read-only */
    VIR_DEVICE_RW = 2 /* Access read-write */
    VIR_DEVICE_RW_FORCE = 3 /*  Forced read-write even if already used */
};

Structure virDomain

struct _virDomain {
The content of this structure is not made public by the API.
} virDomain;

Enum virDomainCreateFlags

enum virDomainCreateFlags {
    VIR_DOMAIN_NONE = 0
};

Structure virDomainInfo

struct _virDomainInfo {
    unsigned char	state	: the running state, one of virDomainFlags
    unsigned long	maxMem	: the maximum memory in KBytes allowed
    unsigned long	memory	: the memory in KBytes used by the domain
    unsigned short	nrVirtCpu	: the number of virtual CPUs for the domain
    unsigned long long	cpuTime	: the CPU time used in nanoseconds
} virDomainInfo;

Typedef virDomainInfoPtr

virDomainInfo * virDomainInfoPtr;

a virDomainInfoPtr is a pointer to a virDomainInfo structure.

Structure virDomainKernel

struct _virDomainKernel {
    const char *	kernel	: filename pointing to the kernel image
    const char *	ramdisk	: an optional init ramdisk
    const char *	root	: an optional root block device
    const char *	extra	: optional kernel command line parameters
} virDomainKernel;

Typedef virDomainKernelPtr

virDomainKernel * virDomainKernelPtr;

a virDomainKernelPtr is a pointer to a virDomainKernel structure.

Typedef virDomainPtr

virDomain * virDomainPtr;

a virDomainPtr is pointer to a virDomain private structure, this is the type used to reference a Xen domain in the API.

Enum virDomainRestart

enum virDomainRestart {
    VIR_DOMAIN_DESTROY = 1 /* destroy the domain */
    VIR_DOMAIN_RESTART = 2 /* restart the domain */
    VIR_DOMAIN_PRESERVE = 3 /* keep as is, need manual destroy, for debug */
    VIR_DOMAIN_RENAME_RESTART = 4 /*  restart under an new unique name */
};

Enum virDomainState

enum virDomainState {
    VIR_DOMAIN_NOSTATE = 0 /* no state */
    VIR_DOMAIN_RUNNING = 1 /* the domain is running */
    VIR_DOMAIN_BLOCKED = 2 /* the domain is blocked on resource */
    VIR_DOMAIN_PAUSED = 3 /* the domain is paused by user */
    VIR_DOMAIN_SHUTDOWN = 4 /* the domain is being shut down */
    VIR_DOMAIN_SHUTOFF = 5 /* the domain is shut off */
    VIR_DOMAIN_CRASHED = 6 /*  the domain is crashed */
};

Structure virNodeInfo

struct _virNodeInfo {
    charmodel[32]	model	: string indicating the CPU model
    unsigned long	memory	: memory size in kilobytes
    unsigned int	cpus	: the number of active CPUs
    unsigned int	mhz	: expected CPU frequency
    unsigned int	nodes	: the number of NUMA cell, 1 for uniform mem access
    unsigned int	sockets	: number of CPU socket per node
    unsigned int	cores	: number of core per socket
    unsigned int	threads	: number of threads per core
} virNodeInfo;

Typedef virNodeInfoPtr

virNodeInfo * virNodeInfoPtr;

a virNodeInfoPtr is a pointer to a virNodeInfo structure.

Structure virVcpuInfo

struct _virVcpuInfo {
    unsigned int	number	: virtual CPU number
    int	state	: value from virVcpuState
    unsigned long long	cpuTime	: CPU time used, in nanoseconds
    int	cpu	: real CPU number, or -1 if offline
} virVcpuInfo;

Typedef virVcpuInfoPtr

virVcpuInfo * virVcpuInfoPtr;

Enum virVcpuState

enum virVcpuState {
    VIR_VCPU_OFFLINE = 0 /* the virtual CPU is offline */
    VIR_VCPU_RUNNING = 1 /* the virtual CPU is running */
    VIR_VCPU_BLOCKED = 2 /*  the virtual CPU is blocked on resource */
};

virConnectClose ()

int	virConnectClose			(virConnectPtr conn)

This function closes the connection to the Hypervisor. This should not be called if further interaction with the Hypervisor are needed especially if there is running domain which need further monitoring by the application.

virConnectGetType ()

const char *	virConnectGetType	(virConnectPtr conn)

Get the name of the Hypervisor software used.

virConnectGetVersion ()

int	virConnectGetVersion		(virConnectPtr conn, 
					 unsigned long * hvVer)

Get the version level of the Hypervisor running. This may work only with hypervisor call, i.e. with priviledged access to the hypervisor, not with a Read-Only connection.

virConnectListDefinedDomains ()

int	virConnectListDefinedDomains	(virConnectPtr conn, 
					 const char ** names, 
					 int maxnames)

list the defined domains, stores the pointers to the names in @names

virConnectListDomains ()

int	virConnectListDomains		(virConnectPtr conn, 
					 int * ids, 
					 int maxids)

Collect the list of active domains, and store their ID in @maxids

virConnectNumOfDomains ()

int	virConnectNumOfDomains		(virConnectPtr conn)

Provides the number of active domains.

virConnectOpen ()

virConnectPtr	virConnectOpen		(const char * name)

This function should be called first to get a connection to the Hypervisor and xen store

virConnectOpenReadOnly ()

virConnectPtr	virConnectOpenReadOnly	(const char * name)

This function should be called first to get a restricted connection to the libbrary functionalities. The set of APIs usable are then restricted on the available methods to control the domains.

virDomainCreate ()

int	virDomainCreate			(virDomainPtr domain)

launch a defined domain. If the call succeed the domain moves from the defined to the running domains pools.

virDomainCreateLinux ()

virDomainPtr	virDomainCreateLinux	(virConnectPtr conn, 
					 const char * xmlDesc, 
					 unsigned int flags)

Launch a new Linux guest domain, based on an XML description similar to the one returned by virDomainGetXMLDesc() This function may requires priviledged access to the hypervisor.

virDomainDefineXML ()

virDomainPtr	virDomainDefineXML	(virConnectPtr conn, 
					 const char * xml)

define a domain, but does not start it

virDomainDestroy ()

int	virDomainDestroy		(virDomainPtr domain)

Destroy the domain object. The running instance is shutdown if not down already and all resources used by it are given back to the hypervisor. The data structure is freed and should not be used thereafter if the call does not return an error. This function may requires priviledged access

virDomainFree ()

int	virDomainFree			(virDomainPtr domain)

Free the domain object. The running instance is kept alive. The data structure is freed and should not be used thereafter.

virDomainGetID ()

unsigned int	virDomainGetID		(virDomainPtr domain)

Get the hypervisor ID number for the domain

virDomainGetInfo ()

int	virDomainGetInfo		(virDomainPtr domain, 
					 virDomainInfoPtr info)

Extract information about a domain. Note that if the connection used to get the domain is limited only a partial set of the information can be extracted.

virDomainGetMaxMemory ()

unsigned long	virDomainGetMaxMemory	(virDomainPtr domain)

Retrieve the maximum amount of physical memory allocated to a domain. If domain is NULL, then this get the amount of memory reserved to Domain0 i.e. the domain where the application runs.

virDomainGetName ()

const char *	virDomainGetName	(virDomainPtr domain)

Get the public name for that domain

virDomainGetOSType ()

char *	virDomainGetOSType		(virDomainPtr domain)

Get the type of domain operation system.

virDomainGetUUID ()

int	virDomainGetUUID		(virDomainPtr domain, 
					 unsigned char * uuid)

Get the UUID for a domain

virDomainGetUUIDString ()

int	virDomainGetUUIDString		(virDomainPtr domain, 
					 char * buf)

Get the UUID for a domain as string. For more information about UUID see RFC4122.

virDomainGetVcpus ()

int	virDomainGetVcpus		(virDomainPtr domain, 
					 virVcpuInfoPtr info, 
					 int maxinfo, 
					 unsigned char * cpumaps, 
					 int maplen)

Extract information about virtual CPUs of domain, store it in info array and also in cpumaps if this pointer is'nt NULL.

virDomainGetXMLDesc ()

char *	virDomainGetXMLDesc		(virDomainPtr domain, 
					 int flags)

Provide an XML description of the domain. The description may be reused later to relaunch the domain with virDomainCreateLinux().

virDomainLookupByID ()

virDomainPtr	virDomainLookupByID	(virConnectPtr conn, 
					 int id)

Try to find a domain based on the hypervisor ID number

virDomainLookupByName ()

virDomainPtr	virDomainLookupByName	(virConnectPtr conn, 
					 const char * name)

Try to lookup a domain on the given hypervisor based on its name.

virDomainLookupByUUID ()

virDomainPtr	virDomainLookupByUUID	(virConnectPtr conn, 
					 const unsigned char * uuid)

Try to lookup a domain on the given hypervisor based on its UUID.

virDomainLookupByUUIDString ()

virDomainPtr	virDomainLookupByUUIDString	(virConnectPtr conn, 
						 const char * uuidstr)

Try to lookup a domain on the given hypervisor based on its UUID.

virDomainPinVcpu ()

int	virDomainPinVcpu		(virDomainPtr domain, 
					 unsigned int vcpu, 
					 unsigned char * cpumap, 
					 int maplen)

Dynamically change the real CPUs which can be allocated to a virtual CPU. This function requires priviledged access to the hypervisor.

virDomainReboot ()

int	virDomainReboot			(virDomainPtr domain, 
					 unsigned int flags)

Reboot a domain, the domain object is still usable there after but the domain OS is being stopped for a restart. Note that the guest OS may ignore the request.

virDomainRestore ()

int	virDomainRestore		(virConnectPtr conn, 
					 const char * from)

This method will restore a domain saved to disk by virDomainSave().

virDomainResume ()

int	virDomainResume			(virDomainPtr domain)

Resume an suspended domain, the process is restarted from the state where it was frozen by calling virSuspendDomain(). This function may requires priviledged access

virDomainSave ()

int	virDomainSave			(virDomainPtr domain, 
					 const char * to)

This method will suspend a domain and save its memory contents to a file on disk. After the call, if successful, the domain is not listed as running anymore (this may be a problem). Use virDomainRestore() to restore a domain after saving.

virDomainSetMaxMemory ()

int	virDomainSetMaxMemory		(virDomainPtr domain, 
					 unsigned long memory)

Dynamically change the maximum amount of physical memory allocated to a domain. If domain is NULL, then this change the amount of memory reserved to Domain0 i.e. the domain where the application runs. This function requires priviledged access to the hypervisor.

virDomainSetMemory ()

int	virDomainSetMemory		(virDomainPtr domain, 
					 unsigned long memory)

Dynamically change the target amount of physical memory allocated to a domain. If domain is NULL, then this change the amount of memory reserved to Domain0 i.e. the domain where the application runs. This function may requires priviledged access to the hypervisor.

virDomainSetVcpus ()

int	virDomainSetVcpus		(virDomainPtr domain, 
					 unsigned int nvcpus)

Dynamically change the number of virtual CPUs used by the domain. Note that this call may fail if the underlying virtualization hypervisor does not support it or if growing the number is arbitrary limited. This function requires priviledged access to the hypervisor.

virDomainShutdown ()

int	virDomainShutdown		(virDomainPtr domain)

Shutdown a domain, the domain object is still usable there after but the domain OS is being stopped. Note that the guest OS may ignore the request. TODO: should we add an option for reboot, knowing it may not be doable in the general case ?

virDomainSuspend ()

int	virDomainSuspend		(virDomainPtr domain)

Suspends an active domain, the process is frozen without further access to CPU resources and I/O but the memory used by the domain at the hypervisor level will stay allocated. Use virDomainResume() to reactivate the domain. This function may requires priviledged access.

virDomainUndefine ()

int	virDomainUndefine		(virDomainPtr domain)

undefine a domain but does not stop it if it is running

virGetVersion ()

int	virGetVersion			(unsigned long * libVer, 
					 const char * type, 
					 unsigned long * typeVer)

Provides two information back, @libVer is the version of the library while @typeVer will be the version of the hypervisor type @type against which the library was compiled. If @type is NULL, "Xen" is assumed, if @type is unknown or not availble, an error code will be returned and @typeVer will be 0.

virInitialize ()

int	virInitialize			(void)

Initialize the library. It's better to call this routine at startup in multithreaded applications to avoid potential race when initializing the library.

virNodeGetInfo ()

int	virNodeGetInfo			(virConnectPtr conn, 
					 virNodeInfoPtr info)

Extract hardware information about the node.