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This patch lifts the limit of calling thread detection code only on KVM guests. With upstream qemu the thread mappings are reported also on non-KVM machines. QEMU adopted the thread_id information from the kvm branch. To remain compatible with older upstream versions of qemu the check is attempted but the failure to detect threads (or even run the monitor command - on older versions without SMP support) is treated non-fatal and the code reports one vCPU with pid of the hypervisor (in same fashion this was done on non-KVM guests). (cherry picked from commit c833526924d56e14f2d0133804cf209f5f47a228)
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>