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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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Michal Privoznik 3b94239ffb qemu_driver: Try KVM_CAP_MAX_VCPUS only if defined 
With our recent patch (1715c83b5f) we thrive to get the correct
number of maximal VCPUs. However, we are using a constant from
linux/kvm.h which may be not defined in every distro. Hence, we
should guard usage of the constant with ifdef preprocessor
directive. This was introduced in kernel:

    commit 8c3ba334f8588e1d5099f8602cf01897720e0eca
    Author: Sasha Levin <levinsasha928@gmail.com>
    Date:   Mon Jul 18 17:17:15 2011 +0300

    KVM: x86: Raise the hard VCPU count limit

    The patch raises the hard limit of VCPU count to 254.

    This will allow developers to easily work on scalability
    and will allow users to test high VCPU setups easily without
    patching the kernel.

    To prevent possible issues with current setups, KVM_CAP_NR_VCPUS
    now returns the recommended VCPU limit (which is still 64) - this
    should be a safe value for everybody, while a new KVM_CAP_MAX_VCPUS
    returns the hard limit which is now 254.

$ git desc 8c3ba334f
v3.1-rc7-48-g8c3ba33
2013-03-13 14:31:29 +01:00
.gnulib@819b1c38b9 maint: update to latest gnulib 2013-02-01 09:24:00 -07:00
build-aux Document bracket whitespace rules & add syntax-check rule 2012-11-02 14:00:32 +00:00
daemon Remove hack using existance of an 'identity' string to disable auth 2013-03-12 18:07:17 +00:00
docs docs: Clarify semantics of sparse storage volumes 2013-03-12 09:03:14 +01:00
examples hellolibvirt: Adjust code to use new APIs 2013-03-04 17:36:03 -05:00
gnulib maint: update to latest gnulib 2013-01-02 09:38:30 -07:00
include Introduce virDomainMigrate*CompressionCache APIs 2013-02-22 17:35:59 +01:00
m4 Fix typo in configure.ac causing $LIBS to gain a copy of $CFLAGS 2013-02-05 18:04:16 +00:00
po Release of libvirt 1.0.3 2013-03-05 12:00:53 +08:00
python python: fix fd leak in generator.py 2013-03-01 15:49:07 +08:00
src qemu_driver: Try KVM_CAP_MAX_VCPUS only if defined 2013-03-13 14:31:29 +01:00
tests virCaps: conf: start splitting out irrelevat data 2013-03-13 09:27:14 +01:00
tools virsh: fix snapshot-create with no xmlfile 2013-03-11 13:39:11 +01:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore Add autogenerated lxc_protocol.[ch] to gitignore 2013-02-18 08:57:57 -06:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Add John Ferlan to the committers list 2013-02-05 10:59:32 -05:00
autobuild.sh Switch automated builds to use Mingw64 toolchain instead of Mingw32 2012-06-25 10:41:10 +01:00
autogen.sh build: fix incremental autogen.sh when no AUTHORS is present 2012-12-03 14:59:09 -07:00
bootstrap maint: update to latest gnulib 2013-02-01 09:24:00 -07:00
bootstrap.conf build: more mingw fixes 2013-02-15 15:45:52 -07:00
cfg.mk tests: uniformly report test failures 2013-02-25 17:38:11 -07:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac Release of libvirt 1.0.3 2013-03-05 12:00:53 +08:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING Turn virSecurityManager into a virObjectLockable 2013-02-11 12:33:41 +00:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in Release of libvirt 1.0.3 2013-03-05 12:00:53 +08:00
Makefile.am build: Fix AUTHORS generation 2012-12-17 21:17:55 +01:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
mingw-libvirt.spec.in spec: indent %if to make it easier to see conditions 2013-01-21 10:36:14 -07:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in run: license as LGPL 2013-02-23 14:03:19 -07:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>