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mirror of https://gitlab.com/libvirt/libvirt.git synced 2025-03-20 07:59:00 +00:00
Peter Krempa f0fa9080d4 qemu: cgroup: Properly set up vcpu pinning
When the default cpuset or automatic numa placement is used libvirt
would place the whole parent cgroup in the specified cpuset. This then
disallowed to re-pin the vcpus to a different cpu.

This patch pins only the vcpu threads to the default cpuset and thus
allows to re-pin them later.

The following config would fail to start:
<domain type='kvm'>
  ...
  <vcpu placement='static' cpuset='0-1' current='2'>4</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='2-3'/>
    ...

This is a regression since a39f69d2b.
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         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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