[libvirt] RFC: add <currentVcpu> element

[Daniel Veillard]

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

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