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Libvirt native C API and daemons
a396f76f70
Features removed from a CPU model are marked with "removed='yes'" attribute in the CPU map. Such features will always be present in a CPU definition produced by libvirt regardless on their state. In other words a running domain (even saved in a file) will always explicitly contain states of all features removed from the specified CPU model. This enables migration to older libvirt which would otherwise think the affected features should be enabled as they are still included in the CPU model in the older version of CPU map. Migration from an old libvirt to a new one would be broken as the new libvirt would think the removed features should be disabled (because they are not included in the CPU model anymore), which might not be the case on the source host. Thus we were refusing to remove CPU features unless they were never working and no domain could even be running with those features enabled. This patch removes the limitation. When handling CPU definitions with missing features marked as removed in the specified CPU model, we know whether it comes from a running domain, in which case it must have been created by older libvirt where the missing CPU features were not removed yet. This means the features must have been enabled on the source and we can automatically fix the definition by adding the missing features with correct states. We can safely remove any CPU feature from our CPU models now, but it should only be used for features removed from all versions of a given CPU model in QEMU because unversioned models correspond to v1. 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