Re: [Qemu-devel] [PATCH 0/8] [PATCH RFC v2] s390-qemu: cpu hotplug

[Christian Borntraeger <borntraeger@de.ibm.com>]

On 07/06/13 19:27, Jason J. Herne wrote:
> Latest code for cpu Hotplug designed to be controled via the QOM infrastructure.
> cpu on S390 are treated as devices via a new platform independent
> infrastructure I designed to allow this "new way" to exist with the "old way"
> of representing cpus.
> 
> The Qemu command line now allows "-device s390-cpu" which will instantiate a 
> cpu device. This is additive to anything that might be specified on the -smp
> parameter.
> 
> Devices can be hot plugged via the monitor command "device_add s390-cpu".
> Hotplugged cpus are created in the configured state and can be used by the
> guest after the guest onlines the cpu by: 
> "echo 1 > /sys/bus/cpu/devices/cpuN/online"
> 
> Hot unplugging is currently not implemented by this code. 

Adding Viktor, Andreas.

Andreas, since we are the first ones going forward with cpu is a device (on a command level)
we still have to provide the old cpu_add  and query commands to make libvirt work regarding
cpu hotplugging.
Are you ok with having the x86 commands as wrappers around the new ones?

Christian