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The "<apic/>" feature, although it's available only for x86 guests, can be declared in the domain XML of other archs without errors. But setting its 'eoi' attribute will break QEMU. For "<apic eoi='on'/>", in a ppc64 guest: qemu-kvm: Expected key=value format, found +kvm_pv_eoi A similar error happens with eoi='off'. One can argue that it's better to simply forbid launching non-x86 guests with "<apic/>" declared in the XML - it is a feature that the architecture doesn't support and this would make it clearer about it. This is sensible, but there are non-x86 guests that are running with "<apic/>" declared in the domain (and A LOT of guests running with "<acpi/>" for that matter, probably reminiscent of x86 templates that were reused for other archs) that will stop working if we go this route. A more subtle approach is to detect if the 'eoi' element is being set for non-x86 guests and warn the user about it with a better error message than the one QEMU provides. This is the new error message when any value is set for the 'eoi' element in a ppc64 XML: error: unsupported configuration: The 'eoi' attribute of the 'apic' feature is not supported for architecture 'ppc64' or machine type 'pseries'. https://bugzilla.redhat.com/show_bug.cgi?id=1236440 Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Reviewed-by: Andrea Bolognani <abologna@redhat.com>
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:
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
Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands, however, we mandate to have the build directory different than the source directory. For example, to build in a manner that is suitable for installing as root, use:
$ mkdir build && cd build
$ ../configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install
While to build & install as an unprivileged user
$ mkdir build && cd build
$ ../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:
- 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: