On Tue, Sep 28, 2010 at 04:36:51PM -0600, Eric Blake wrote:
On 09/27/2010 11:20 AM, Eric Blake wrote:
Another question I had, is there a way in QEmu to specifiy a different cpu count from the -smp indicating the startup count ?
I wish I knew off-hand, as it would make it easier for me to implement when I get to that part of the patch series :) But even if there isn't, I think that starting with the maximum via -smp and immediately after hot-unplugging to the current count is better than nothing.
Answering my own question: with qemu 0.12.5, 'qemu -help' lists:
-smp n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets] set the number of CPUs to 'n' [default=1] maxcpus= maximum number of total cpus, including offline CPUs for hotplug etc.
So it looks like '-smp 1,maxcpus=2' maps nicely to <vcpu current='1'>2</vcpu>.
But per tests/qemuhelpdata, qemu 0.11.0 lacks this, so I also have to code up a qemu feature test.
Right but that's good, we can really fully implement this :-) Daniel -- Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/ daniel@veillard.com | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization library http://libvirt.org/