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params and nparams are essential and cannot be NULL. Check this in libvirt.c and remove redundant checks from the drivers (e.g. xend). Instead of enforcing that nparams must point to exact same value as returned by virDomainGetSchedulerType relax this to a lower bound check. This is what some drivers (e.g. xen hypervisor and esx) already did. Other drivers (e.g. xend) didn't check nparams at all and assumed that there is enough space in params. Unify the behavior in all drivers to a lower bound check and update nparams to the number of valid values in params on success.
LibVirt : simple API for virtualization Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It is free software available under the GNU Lesser General Public License. Virtualization of the Linux Operating System means the ability to run multiple instances of Operating Systems concurrently on a single hardware system where the basic resources are driven by a Linux instance. The library aim at providing long term stable C API initially for the Xen paravirtualization but should be able to integrate other virtualization mechanisms if needed. Daniel Veillard <veillard@redhat.com>
Description
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.
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