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Libvirt native C API and daemons
df2ef2e706
When a thread-context object is specified on the cmd line, then QEMU spawns a thread and sets its affinity to the list of NUMA nodes specified in .node-affinity attribute. And this works just fine, until the main QEMU thread itself is not restricted. Because of v5.3.0-rc1~18 we restrict the main emulator thread even before QEMU is executed and thus then it tries to set affinity of a thread-context thread, it inevitably fails with: Setting CPU affinity failed: Invalid argument Now, we could lift the pinning temporarily, let QEMU spawn all thread-context threads, and enforce pinning again, but that would require some form of communication with QEMU (maybe -preconfig?). But that would still be wrong, because it would circumvent <emulatorpin/>. Technically speaking, thread-context is an internal implementation detail of QEMU, and if it weren't for it, the main emulator thread would be doing the allocation. Therefore, we should honor the pinning and prune the list of node so that inaccessible ones are dropped. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2154750 Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Kristina Hanicova <khanicov@redhat.com> Reviewed-by: Andrea Bolognani <abologna@redhat.com> |
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==============================
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:
https://libvirt.org
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:
https://libvirt.org/contact.html