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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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Andrea Bolognani 5f2212c062 qemu: Fix qemuProcessInitCpuAffinity() 
Ever since the feature was introduced with commit 0f8e7ae33a,
it has contained a logic error in that it attempted to use a NUMA
node map where a CPU map was expected.

Because of that, guests using <numatune> might fail to start:

  # virsh start guest
  error: Failed to start domain guest
  error: cannot set CPU affinity on process 40055: Invalid argument

This was particularly easy to trigger on POWER 8 machines, where
secondary threads always show up as offline in the host: having

  <numatune>
    <memory mode='strict' placement='static' nodeset='1'/>
  </numatune>

in the guest configuration, for example, would result in libvirt
trying to set the process affinity so that it would prefer
running on CPU 1, but since that's a secondary thread and thus
shows up as offline, the operation would fail, and so would
starting the guest.

Use the newly introduced virNumaNodesetToCPUset() to convert the
NUMA node map to a CPU map, which in the example above would be
48,56,64,72,80,88 - a valid input for virProcessSetAffinity().

https://bugzilla.redhat.com/show_bug.cgi?id=1703661

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2019-06-04 09:29:35 +02:00
.ctags.d maint: Add support for .ctags.d 2019-05-31 17:54:28 +02:00
.gnulib@8089c00979 maint: update gnulib for syntax-check on BSD 2019-01-07 13:54:07 -06:00
build-aux build-aux: header-ifdef: Handle #pragma once 2019-04-04 18:42:09 -04:00
docs news: Drop empty section 2019-06-03 18:24:53 +02:00
examples examples: Group all C programs together 2019-06-03 17:27:43 +02:00
gnulib maint: Fix VPATH build 2019-01-07 21:56:16 -06:00
include/libvirt qemu: Add entry for balloon stats stat-htlb-pgalloc and stat-htlb-pgfail 2019-05-20 11:18:25 +02:00
m4 m4: Drop needless string checks 2019-05-17 15:08:59 +02:00
po po: refresh translations from zanata 2019-01-14 18:10:21 +00:00
src qemu: Fix qemuProcessInitCpuAffinity() 2019-06-04 09:29:35 +02:00
tests util: Introduce virBitmapUnion() 2019-06-04 09:29:35 +02:00
tools qemu: Add entry for balloon stats stat-htlb-pgalloc and stat-htlb-pgfail 2019-05-20 11:18:25 +02:00
.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 examples: Group all C programs together 2019-06-03 17:27:43 +02:00
.gitlab-ci.yml tests: perform cross compiler builds on GitLab CI 2019-05-09 11:34:53 +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: put macOS script inline in the macOS matrix entry 2019-04-11 18:38:56 +01:00
.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 gnulib for syntax-check on BSD 2019-01-07 13:54:07 -06:00
bootstrap.conf maint: Stop generating ChangeLog from git 2019-04-03 09:45:25 +02:00
cfg.mk examples: Group all C programs together 2019-06-03 17:27:43 +02:00
ChangeLog maint: Stop generating ChangeLog from git 2019-04-03 09:45:25 +02:00
config-post.h build: remove WITH_YAJL2 2019-04-03 13:30:47 +02:00
configure.ac maint: Post-release version bump to 5.5.0 2019-06-03 17:19:28 +02:00
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 examples: Install Polkit examples 2019-06-03 17:27:28 +02:00
Makefile.am Don't include Makefile.ci in Makefile.am 2019-05-10 09:12:52 +02:00
Makefile.ci Add support for podman in Makefile.ci 2019-05-10 14:13:06 +02:00
Makefile.nonreentrant Remove backslash alignment attempts 2017-11-03 13:24:12 +01:00
mingw-libvirt.spec.in spec: Bump minimum supported Fedora version to 29 2019-05-09 15:08:03 +02:00
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: Don't export unnecessary paths 2019-03-15 11:50:23 +01:00

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