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Libvirt native C API and daemons
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Daniel P. Berrangé 5df2c49263 util: directly query KVM for TSC scaling support
We currently query the host MSRs to determine if TSC scaling is
supported. This works OK when running privileged and can open
the /dev/cpu/0/msr. When unprivileged we fallback to querying
MSRs from /dev/kvm. This is incorrect because /dev/kvm only
reports accurate info for MSRs that are valid to use from inside
a guest.  The TSC scaling support MSR is not, thus we always end
up reporting lack of TSC scaling when unprivileged.

The solution to this is easy, because KVM can directly report
whether TSC scaling is available, which matches what QEMU will
do at startup.

Closes: https://gitlab.com/libvirt/libvirt/-/issues/188
Reported-by: Roman Mohr <rmohr@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2021-08-06 12:00:53 +01:00
.ctags.d maint: Add support for .ctags.d 2019-05-31 17:54:28 +02:00
.github github: skip lockdown of old issues/prs 2020-04-07 17:50:54 +01:00
.gitlab/issue_templates gitlab: Add disclaimer to the 'feature' issue template 2021-07-30 15:26:45 +02:00
build-aux syntax-check: Prohibit 'vir' prefix for enum implementations in virsh 2021-07-23 09:59:12 +02:00
ci ci: Adapt to lcitool command line changes 2021-08-04 09:52:28 +02:00
docs schema: make target mandatory for filesystems 2021-07-27 15:30:50 +02:00
examples examples: test: Add a new test xml with more tainted configs for testing 2021-08-03 14:22:10 +02:00
include Add basic driver for the Cloud-Hypervisor 2021-06-04 10:56:06 +01:00
po Translated using Weblate (Ukrainian) 2021-07-30 15:28:34 +02:00
scripts lib: Drop internal virXXXPtr typedefs 2021-04-13 17:00:38 +02:00
src util: directly query KVM for TSC scaling support 2021-08-06 12:00:53 +01:00
tests virNWFilterRuleDefToRuleInst: Remove pointless assignment 2021-08-06 08:53:26 +02:00
tools util: alloc: Reimplement VIR_APPEND_ELEMENT using virAppendElement 2021-08-06 08:53:25 +02:00
.color_coded.in gnulib: delete all gnulib integration 2020-02-07 15:03:54 +00:00
.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
.editorconfig Add .editorconfig 2019-09-06 12:47:46 +02:00
.gitignore gitignore: Ignore __pycache__ directory 2021-03-22 12:05:11 +01:00
.gitlab-ci.yml gitlab: use custom docker:dind image 2021-08-02 16:49:49 +01:00
.gitmodules gnulib: delete all gnulib integration 2020-02-07 15:03:54 +00:00
.gitpublish gitpublish: add a subject prefix 2020-01-16 13:04:11 +00:00
.mailmap mailmap: consolidate my email addresses 2020-10-06 12:05:09 +02:00
.ycm_extra_conf.py.in gnulib: delete all gnulib integration 2020-02-07 15:03:54 +00:00
AUTHORS.rst.in AUTHORS: Add myself to the list of commiters 2021-07-14 14:51:19 +02:00
config.h meson: Declare GLIB_VERSION_* macros at configure 2021-05-03 12:08:26 +02:00
configmake.h.in meson: generate configmake.h 2020-08-03 09:26:48 +02:00
CONTRIBUTING.rst meson: adjust our documentation to mention meson instead of autoconf 2020-08-03 09:27:09 +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
gitdm.config gitdm: add 'ibm' file 2019-10-18 17:32:52 +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: use direct remote connection for Fedora >= 35 / RHEL >= 9 2021-08-04 16:06:11 +01:00
meson_options.txt remote: switch to auto-spawn modular daemons by default 2021-06-18 17:13:15 +01:00
meson.build Post-release version bump to 7.7.0 2021-08-02 12:27:55 +02:00
mingw-libvirt.spec.in rpm: fix mingw obsoletes lines 2021-08-02 13:47:20 +01:00
NEWS.rst Post-release version bump to 7.7.0 2021-08-02 12:27:55 +02:00
README.rst README: drop Travis CI badge 2020-08-03 15:08:28 +02:00
run.in run: fix spawning of daemons 2021-04-07 11:41:26 +01:00

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==============================
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 2.0 (or later). See the files ``COPYING.LESSER``
and ``COPYING`` for full license terms & conditions.


Installation
============

Instructions on building and installing libvirt can be found on the website:

https://libvirt.org/compiling.html

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:

* libvirt-users@redhat.com (**for user discussions**)
* libvir-list@redhat.com (**for development only**)

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

https://libvirt.org/contact.html