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After guest is started, or we are reconnecting to already running one (after daemon restart), qemuProcessRefreshRxFilters() is called to refresh rx-filters (basically MAC addresses of guest NICs) as they might have changed while we were not running (for the case when reconnecting to an already running guest), or we need to enable them by running a command (for freshly started guest - see processNicRxFilterChangedEvent()). Now, our XML parser allowed trustGuestRxFilters attribute for all types and models of <interface/> while in reality, only virtio model AND TUN/TAP based types can see MAC address changes. For other combinations, QEMU reports an error. This all means that when the daemon is restarted and it reconnects to a guest with, well invalid configuration, or when such guest is restored from a saved image, or migrated then we issue the monitor command, to which QEMU replies with an error which is then propagated to users: error: internal error: unable to execute QEMU command 'query-rx-filter': invalid net client name: hostdev0 While on one hand users should fix their configuration (and after v10.0.0-rc1~123 they can do that even on live domains), libvirt can also has some logic built in that prevent issuing the command in the first place (for obviously wrong cases). Fixes: 060d4c83ef436cf56abfad51a4d64c39448e199d Signed-off-by: Michal Privoznik <mprivozn@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: