Re: [Xen-devel] PVHVM VCPU hotplug mechanism via ACPI hotplug doesn't work in Xen 4.[1, 2, 3]

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 6 May 2013, Konrad Rzeszutek Wilk wrote:
> Which is probably the case b/c the Linux side implementation for
> such simple operation as :
> 
> echo 0 > /sys/devices/system/cpu/cpu1/online
> echo 1 > /sys/devices/system/cpu/cpu1/online
> 
> would have blown up so nobody tested it?
> 
> Now that is fixed (v3.10 + 
> http://lists.xen.org/archives/html/xen-devel/2013-05/msg00503.html)
> I tried to do 'xm vcpu-set latest X' for a PVHVM guest.
> 
> The first iteration was using this simple guest config:
> builder='hvm'
> disk = [ 'file:/mnt/lab/latest/root_image.iso,hdc:cdrom,r']
> memory = 2048
> boot="d"
> maxvcpus=4
> vcpus=4

I think that you might have to set maxvcpus=4 and vcpus=2 if you want to
be able to hotplug a couple of more vcpus (the last two in this case).

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