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When we are about to spawn QEMU, we validate the domain definition against qemuCaps. Except when domain is/was already running before (i.e. on incoming migration, snapshots, resume from a file). However, especially on incoming migration it may happen that the destination QEMU is different to the source QEMU, e.g. the destination QEMU may have some devices disabled. And we have a function that validates devices/features requested in domain XML against the desired QEMU capabilities (aka qemuCaps) - it's virDomainDefValidate() which calls qemuValidateDomainDef() and qemuValidateDomainDeviceDef() subsequently. But the problem here is that the validation function is explicitly skipped over in specific scenarios (like incoming migration, restore from a snapshot or previously saved file). This in turn means that we may spawn QEMU and request device/features it doesn't support. When that happens QEMU fails to load migration stream: qemu-kvm: ... 'virtio-mem-pci' is not a valid device model name (NB, while the example shows one particular device, the problem is paramount) This problem is easier to run into since we are slowly moving validation from qemu_command.c into said validation functions. The solution is simple: do the validation in all cases. And while it may happen that users would be unable to migrate/restore a guest due to a bug in our validator, spawning QEMU without validation is worse (especially when you consider that users can supply their own XMLs for migrate/restore operations - these were never validated). Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2048435 Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Peter Krempa <pkrempa@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