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When parsing the guest XML we must fill in the default guest arch if it is not already present because later parts of the parsing process need this information. If no arch is specified we lookup the first guest in the capabilities data matching the os type and virt type. In most cases this will result in picking the host architecture but there are some exceptions... - The test driver is hardcoded to always use i686 arch - The VMWare/ESX drivers will always place i686 guests ahead of x86_64 guests in capabilities, so effectively they always use i686 - The QEMU driver can potentially return any arch at all depending on what combination of QEMU binaries are installed. The domain XML hardware configurations are inherently architecture specific in many places. As a result whomever/whatever created the domain XML will have had a particular architecture in mind when specifying the config. In pretty much any sensible case this arch will have been the native host architecture. i686 on x86_64 is the only sensible divergance because both these archs are compatible from a domaain XML config POV. IOW, although the QEMU driver can pick an almost arbitrary arch as its default, in the real world no application or user is likely to be relying on this default arch being anything other than native. With all this in mind, it is reasonable to change the XML parser to allow the default architecture to be passed via the domain XML options struct. If no info is explicitly given then it is safe & sane to pick the host native architecture as the default for the guest. Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@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
Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands, however, we mandate to have the build directory different than the source directory. For example, to build in a manner that is suitable for installing as root, use:
$ mkdir build && cd build
$ ../configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install
While to build & install as an unprivileged user
$ mkdir build && cd build
$ ../configure --prefix=$HOME/usr
$ make
$ make install
The libvirt code relies on a large number of 3rd party libraries. These will
be detected during execution of the configure script and a summary printed
which lists any missing (optional) dependencies.
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: