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Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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John Ferlan 29183778af nodedev: Document the udevEventHandleThread 
Commit cdbe1332 neglected to document the API. So let's add some
details about the algorithm and why it was used to help future
readers understand the issues encountered.

NB: Management of the processing udev device notification is a
delicate balance between the udev process, the scheduler, and when
exactly the data from/for the socket is received. The balance is
particularly important for environments when multiple devices are
added into the system more or less simultaneously such as is done
for mdev or SRIOV. In these cases old libudev blocking on the udev
recv() occurs more frequently. It's expected that future devices
will follow similar algorithms. Even though the algorithm does
present some challenges for older OS's (such as Centos 6), trying
to rewrite the algorithm to fit both models would be more complex
and involve pulling the monitor object out of the private data
lockable object and would need to be guarded by a separate lock.
Devising such an algorithm to work around issues with older OS's
at the expense of more modern OS algorithms in newer event processing
code may result in unexpected issues, so the choice is to encourage
use of newer OS's with newer udev event processing code.

Signed-off-by: John Ferlan <jferlan@redhat.com>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
2018-11-05 07:05:45 -05:00
.gnulib@68df637b5f build: Fix accidental revert of .gnulib update 2018-07-19 16:15:51 -04:00
build-aux build-aux:check-spacing: Introduce a new rule to check misaligned stuff in parenthesises 2018-09-24 10:02:40 +02:00
docs Post-release version bump to 4.10.0 2018-11-05 08:52:17 +01:00
examples apparmor: fix ptrace rules with kernel 4.18 2018-08-27 10:46:45 +02:00
gnulib Update to latest gnulib 2018-03-12 11:27:54 +00:00
include/libvirt qemu: Add entry for balloon stat stat-disk-caches 2018-07-16 17:42:23 -04:00
m4 libxl: fallback to lib probe if pkgconfig file not found 2018-09-20 07:59:26 -06:00
po po: refresh translations from zanata 2018-07-31 12:34:06 +01:00
src nodedev: Document the udevEventHandleThread 2018-11-05 07:05:45 -05:00
tests virfile: Take symlink into account in virFileIsSharedFixFUSE 2018-10-19 13:15:54 +02:00
tools virsh: Fix regression with duplicated error messages 2018-10-12 09:30:56 -05:00
.color_coded.in Add color_coded support 2017-05-09 09:51:11 +02:00
.ctags ctags: Generate tags for headers, i.e. function prototypes 2018-09-18 14:21:33 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore po: minimize & canonicalize translations stored in git 2018-04-19 11:11:08 +01:00
.gitmodules gnulib: switch to use https:// instead of git:// protocol 2018-03-19 16:32:34 +00:00
.gitpublish git: add config file telling git-publish how to send patches 2018-04-23 11:36:09 +01:00
.mailmap AUTHORS: Add Katerina Koukiou 2018-07-17 17:01:19 +02:00
.travis.yml travis: Add MinGW builds 2018-06-15 17:45:27 +02:00
.ycm_extra_conf.py.in Add YouCompleteMe support 2017-05-09 09:51:11 +02:00
ABOUT-NLS po: provide custom make rules for po file management 2018-04-19 10:35:58 +01:00
AUTHORS.in AUTHORS: Add Katerina Koukiou 2018-07-17 17:01:19 +02:00
autogen.sh po: provide custom make rules for po file management 2018-04-19 10:35:58 +01:00
bootstrap maint: update to latest gnulib 2018-07-14 09:10:03 +02:00
bootstrap.conf vsh: Fix broken build on mingw 2018-08-28 08:31:32 +02:00
cfg.mk virfile: Take symlink into account in virFileIsSharedFixFUSE 2018-10-19 13:15:54 +02:00
ChangeLog-old Fix typos in src/* 2014-04-21 16:49:08 -06:00
config-post.h Revert "build: undef WITH_JANSSON for SETUID_RPC_CLIENT" 2018-08-13 15:50:01 +02:00
configure.ac Post-release version bump to 4.10.0 2018-11-05 08:52:17 +01:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: Remove control characters from LGPL license file 2015-09-25 09:16:24 +02:00
libvirt-admin.pc.in Add libvirt-admin library 2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.spec.in rpm: disable some features on riscv64 2018-10-05 13:59:31 +01:00
Makefile.am Forget last daemon/ dir artefacts 2018-07-27 15:44:38 +02:00
Makefile.nonreentrant Remove backslash alignment attempts 2017-11-03 13:24:12 +01:00
mingw-libvirt.spec.in cpu: move the CPU map data files into a src/cpu_map directory 2018-08-28 12:08:21 +01:00
README Provide a useful README file 2017-05-22 17:01:37 +01:00
README-hacking docs: update all GIT repo examples to use https:// protocol 2018-03-21 14:48:01 +00:00
README.md Add CII best practices badge 2017-10-13 16:08:01 +01:00
run.in run: Fix LIBVIRTD_PATH 2018-07-24 12:10:21 -04:00

README.md

Build Status CII Best Practices

Libvirt API for virtualization

Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.

For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.

Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.

Further information about the libvirt project can be found on the website:

https://libvirt.org

License

The libvirt C API is distributed under the terms of GNU Lesser General Public License, version 2.1 (or later). Some parts of the code that are not part of the C library may have the more restrictive GNU General Public License, version 2.1 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.

Installation

Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands. For example, to build in a manner that is suitable for installing as root, use:

$ ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install

While to build & install as an unprivileged user

$ ./configure --prefix=$HOME/usr
$ make
$ make install

The libvirt code relies on a large number of 3rd party libraries. These will be detected during execution of the configure script and a summary printed which lists any missing (optional) dependencies.

Contributing

The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:

https://libvirt.org/contribute.html

Contact

The libvirt project has two primary mailing lists:

Further details on contacting the project are available on the website:

https://libvirt.org/contact.html