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Document for <vcpu>'s "cpuset" says: Since 0.4.4, this element can contain an optional cpuset attribute, which is a comma-separated list of physical CPU numbers that virtual CPUs can be pinned to. However, it's not the truth, libvirt actually pins the domain process to the specified pCPUs by "cpuset" of <vcpu>. And the vcpu thread are pinned to all available pCPUs if no <vcpupin> is specified for it. This patch is to implement the codes to inherit <vcpu>'s "cpuset" for vcpu that doesn't have <vcpupin> specified, and <vcpupin> for these vcpu will be ignored when formating. Underlying driver implementation will make sure the vcpu thread pinned to correct pCPUs.
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>