Hi Eric, Thank you for the explanation. On Wed, 15 Dec 2010 08:42:12 -0700 Eric Blake <eblake@redhat.com> wrote:
I tested "virsh setvcpus" command and it did not work like the following:
# virsh setvcpus RHEL5.5GA_Guest.img 2 error: internal error unable to execute QEMU command 'cpu_set': The command cpu_set has not been ound
qemu vcpu hot-plugging has been a sore spot for some time now. My understanding is that an early implementation used to be upstream, but it was buggy, so current upstream does not support it. RHEL has taken some efforts to provide vcpu hot-plugging beyond what upstream supports, but it is still a work in progress, and I haven't personally tested RHEL 6.0 to see how well it does (most of my vcpu hot-plug testing was done for RHEL 5.x with xen).
#
Has this problem been fixed already on upstream ?
o Test environment Host OS: RHEL6.0 (x86_64) qemu-kvm: 0.12.1.2-2.113.el6 libvirt : 0.8.1-27.el6
https://bugzilla.redhat.com/show_bug.cgi?id=533138 appears to be relevant to your situation, and mentions that the issue has been deferred to at least RHEL 6.1.
I see. Thanks Ken'ichi Ohmichi