3010a69226
When guest has NUMA nodes and QEMU is new enough to report default RAM ID then ideally we would use -numa memdev= combined with memory-backend-* combo becasue -mem-path/-mem-prealloc/-numa mem are deprecated. Well, there is one problem - the .memdev= attribute is machine type dependent (just look at arguments of virQEMUCapsGetMachineNumaMemSupported()) and to ensure backwards compatibility we prefer -numa mem= over -numa memdev=. But there was one corner case when -mem-prealloc was requested but not generated on the cmd line. It all starts with qemuBuildMemCommandLine() which generates just '-m XXX' and because it sees defaultRAMid and guest NUMA nodes greater than zero it does nothing more. Then, qemuBuildNumaCommandLine() sees that -numa mem= is still supported for given machine type and nothing else set @needBackend thus qemuBuildMemPathStr() is called which output -mem-prealloc only in a few cases assuming it was outputted earlier. Reported-by: Jing Qi <jinqi@redhat.com> Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Ján Tomko <jtomko@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: