ec8be9aceb
The '-loadvm' commandline parameter has exactly the same semantics as the HMP 'loadvm' command. This includes the selection of which block device is considered to contain the 'vmstate' section. Since libvirt recently switched to the new QMP commands which allow a free selection of where the 'vmstate' is placed, snapshot reversion will no longer work if libvirt's algorithm disagrees with qemu's. This is the case when the VM has UEFI NVRAM image, in qcow2 format, present. To solve this we'll use the QMP counterpart 'snapshot-load' to load the snapshot instead of using '-loadvm'. We'll do this before resuming processors after startup of qemu and thus the behaviour is identical to what we had before. The logic for selecting the images now checks both the snapshot metadata and the VM definition. In case images not covered by the snapshot definition do have the snapshot it's included in the reversion, but it's fatal if the snapshot is not present in a disk covered in snapshot metadata. The vmstate is selected based on where it's present as libvirt doesn't store this information. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@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:
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: