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Libvirt native C API and daemons
b1d4196580
Although QEMU knows and enables the corresponding MSR bits, it does not allow users to configure them (there are no names attached to them). They should have never been added to the CPU map and definitely not to CPU models as the features will always be considered disabled regardless on their actual state as QEMU will not report them. While we cannot drop them completely for backward compatibility, we can at least remove them from all CPU models. This is effectively no change for CPU models where the features were marked with added='yes' because migration source would always remove the features from domain XML so not adding them to the live XML does not hurt. On the other side the destination could not ever be surprised by the features being suddenly enabled as QEMU never reports them, which means libvirt considers them disabled all the time. GraniteRapids CPU model is the only one which contains the feature ever since it was introduced in libvirt, but it was never possible to migrate a domain with such CPU. The source would always mark vmx-ept-wb as disabled and the destination without the fixes in this series would drop the feature from the XML completely as it is unsupported by QEMU and disabled, but when probing for the actual CPU created by QEMU libvirt would expect the feature to be enabled (as it is included in the CPU model and not explicitly mentioned in the domain definition) and fail the migration. There's nothing the source could do to workaround the behavior on the destination and migration to older libvirt will still be broken. But it's possible to migrate a domain with GraniteRapids to a destination with this series applied from both old and new source. Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Ján Tomko <jtomko@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:
* 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:
https://libvirt.org/contact.html