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After a cpu hotplug the qemu driver did not refresh information about virtual processors used by qemu and their corresponding threads. This patch forces a re-detection as is done on start of QEMU. This ensures that correct information is reported by the virDomainGetVcpus API and "virsh vcpuinfo". A failure to obtain the thread<->vcpu mapping is treated non-fatal and the mapping is not updated in a case of failure as not all versions of QEMU report this in the info cpus command. (cherry picked from commit 3163682b585da7e894c9ea069741755fc316bdb3)
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>