Re: [libvirt] [RFC PATCH 00/12] qemu: add support to hot-plug/unplug cpu device

On Wed, 2015-01-21 at 09:57 +0000, Daniel P. Berrange wrote: > On Wed, Jan 21, 2015 at 04:00:52PM +0800, Zhu Guihua wrote: > > If you apply the folowing patchset > > [PATCH v3 0/7] cpu: add device_add foo-x86_64-cpu support > > https://lists.nongnu.org/archive/html/qemu-devel/2015-01/msg01552.html, > > and [PATCH v2 00/11] cpu: add i386 cpu hot remove support > > https://lists.nongnu.org/archive/html/qemu-devel/2015-01/msg01557.html, > > qemu can support hotplug and hot-unplug cpu device. > > > > So this patch series will make libvirt support hotplug and hot-unplug cpu > > device for qemu driver, and now only supports one cpu driver which is > > 'qemu64-x86_64-cpu'. > > Also I'm wondering how this interacts with CPU topology. eg lets say > you configure a 16 vCPU guest, and set topology to 2 sockets, 4 cores, > 2 threads. Does this hotplug allow you to plug/unplug individual > threads - ie each invididual vCPU, or does it only allow plug/unplug > of sockets - ie 8 vCPUs at a time in this topology. > > qemu has not interacted with CPU topology so for. So now we focus on this feature's realization in a simple way.