Mark, to answer your above question from yesterday, you should be able to
change the number of cores by editing the xml file that describes the guest.
It should be located at /etc/libvirt/qemu/<name>.xml
There should be a line like
<vcpu>1</vcpu>
where you can change the number of CPUs the guest sees. Make your change and
save, then either redefine the xml file (be sure not to undefine!)
sudo virsh
# define /etc/libvirt/qemu/<name>.xml
# quit
substitute it the correct xml of course. Alternatively you should be able to
just restart libvirtd, though I'm not sure what effect this may have on running
guests:
sudo /etc/init.d/libvirt-bin restart
The above has worked for me in the past, I hope it helps.
Thanks for finding the Red Hat bug, I'll attach it to this report so we can
track it.
** Also affects: virt-manager via
https://bugzilla.redhat.com/show_bug.cgi?id=487013
Importance: Unknown
Status: Unknown
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virt-manager freezes when applying hardware change
https://bugs.launchpad.net/bugs/367137
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