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Guests are allowed to change their MAC addresses. Subsequently, we may respond to that with tweaking that part of host side configuration that depends on it. In this particular case: QoS. Some parts of QoS are in fact set on corresponding bridge, where overall view on traffic can be seen. Here, TC filters are used to place incoming packets into qdiscs. These filters match source MAC address. Therefore, upon guest changing its MAC address, the corresponding TC filter needs to be updated too. This is done by simply removing the old one and instantiating a new one, with new MAC address. Now, u32 filters (which we use) use a hash table for matching, internally. And when deleting the old filter, we used to remove the hash table (ID = 800::) and let the new filter instantiate new hash table. This used to work, until kernel release 4.20 (specifically commit v4.20-rc1~27^2~131^2~11 and its friends) where this practice was turned into error. But that's okay - we can delete the specific filter we are after and not touch the hash table at all. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Jiri Denemark <jdenemar@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:
- 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: