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Ideally check='partial' would check exactly the features QEMU would want to enable when asked for a specific CPU model (and features). But there is no way we could ask QEMU how a specific CPU would look like. So we use our definition from CPU map, which may slightly differ as QEMU adds or removes features from CPU models, and thus we may end up checking features which QEMU would not enable while missing some required ones. We can do better in specific cases, though. If a CPU definition uses only a model and disabled features (or none at all), we already know whether QEMU can enable all features required by the CPU model as that's what we use to set usable='yes' attribute in the list of available CPU models in domain capbilities XML. So when a usable CPU model is requested without asking for additional features (disabling features is fine) we can avoid our possible inaccurate check using our CPU map. For backward compatibility we only consider usable models. If a specified model is not usable, we still check it the old way and even let QEMU start it (and disable some features) in case our definition lacks some features compared to QEMU. Fixes: https://gitlab.com/libvirt/libvirt/-/issues/608 Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Peter Krempa <pkrempa@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
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:
- users@lists.libvirt.org (for user discussions)
- devel@lists.libvirt.org (for development only)
Further details on contacting the project are available on the website: