mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-02-14 07:31:30 +00:00
fae0da5c13
Introduces several new public API options for migration - VIR_MIGRATE_PEER2PEER: With this flag the client only invokes the virDomainMigratePerform method, expecting the source host driver to do whatever is required to complete the entire migration process. - VIR_MIGRATE_TUNNELLED: With this flag the actual data for migration will be tunnelled over the libvirtd RPC channel. This requires that VIR_MIGRATE_PEER2PEER is also set. - virDomainMigrateToURI: This is variant of the existing virDomainMigrate method which does not require any virConnectPtr for the destination host. Given suitable driver support, this allows for all the same modes as virDomainMigrate() The URI for VIR_MIGRATE_PEER2PEER must be a valid libvirt URI. For non-p2p migration a hypervisor specific migration URI is used. virDomainMigrateToURI without a PEER2PEER flag is only support for Xen currently, and it involves XenD talking directly to XenD, no libvirtd involved at all. * include/libvirt/libvirt.h.in: Add VIR_MIGRATE_PEER2PEER flag for migration * src/libvirt_internal.h: Add feature flags for peer to peer migration (VIR_FEATURE_MIGRATE_P2P) and direct migration (VIR_MIGRATE_PEER2PEER mode) * src/libvirt.c: Implement support for VIR_MIGRATE_PEER2PEER and virDomainMigrateToURI APIs. * src/xen/xen_driver.c: Advertise support for DIRECT migration * src/xen/xend_internal.c: Add TODO item for p2p migration * src/libvirt_public.syms: Export virDomainMigrateToURI method * src/qemu/qemu_driver.c: Add support for PEER2PEER and migration, and adapt TUNNELLED migration. * tools/virsh.c: Add --p2p and --direct args and use the new virDomainMigrateToURI method where possible.
libvirt library code README
===========================
The directory provides the bulk of the libvirt codebase. Everything
except for the libvirtd daemon and client tools. The build uses a
large number of libtool convenience libraries - one for each child
directory, and then links them together for the final libvirt.so,
although some bits get linked directly to libvirtd daemon instead.
The files directly in this directory are supporting the public API
entry points & data structures.
There are two core shared modules to be aware of:
* util/ - a collection of shared APIs that can be used by any
code. This directory is always in the include path
for all things built
* conf/ - APIs for parsing / manipulating all the official XML
files used by the public API. This directory is only
in the include path for driver implementation modules
Then there are the hypervisor implementations:
* esx/ - VMware ESX and GSX support using vSphere API over SOAP
* lxc/ - Linux Native Containers
* opennebula/ - Open Nebula using XMLRPC
* openvz/ - OpenVZ containers using cli tools
* phyp/ - IBM Power Hypervisor using CLI tools over SSH
* qemu/ - QEMU / KVM using qemu CLI/monitor
* remote/ - Generic libvirt native RPC client
* test/ - A "mock" driver for testing
* uml/ - User Mode Linux
* vbox/ - Virtual Box using native API
* xen/ - Xen using hypercalls, XenD SEXPR & XenStore
Finally some secondary drivers that are shared for several HVs.
Currently these are used by LXC, OpenVZ, QEMU, UML and Xen drivers.
The ESX, OpenNebula, Power Hypervisor, Remote, Test & VirtualBox
drivers all implement the secondary drivers directly
* interface/ - Host network interface management
* network/ - Virtual NAT networking
* node_device/ - Host device enumeration
* secret/ - Secret management
* security/ - Mandatory access control drivers
* storage/ - Storage management drivers
Since both the hypervisor and secondary drivers can be built as
dlopen()able modules, it is *FORBIDDEN* to have build dependencies
between these directories. Drivers are only allowed to depend on
the public API, and the internal APIs in the util/ and conf/
directories