Hi, Am 08.01.2015 um 07:10 schrieb Bharata B Rao: > This patchset enables CPU and memory hotplug support for PowerPC guests. > > Changes in this patchset (v1): > > - Based on top of Michael Roth's tree > (https://github.com/mdroth/qemu/commits/spapr-hotplug-core) which serves > as base for his PCI hotplug patches too. > - Switched to device_add/del semantics instead of cpu-add.
Please don't forget to CC me on this. As previously discussed with Jason and Christian for s390x, there's certain topology modeling questions still unsolved for device-based QOM CPU hot-plug. I have an RFC in the works (again) that hopefully gets us a step closer. > - Supporting CPU hot unplug now. > - Added patches to enable memory hotplug. > - Added ibm,dynamic-reconfiguration-memory support which is needed for > memory hotplug. > > v0 - http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg00752.html > > CPU hotplug > ----------- > - Works with BE guest, has issues with LE guest. Has been tested on BE host > only. > - Adding a core (and all its threads) in response to device_add command. > Similarly removing a core via device_del will remove all the threads. Earlier discussions concluded that hot-plug needs to happen on a socket level, not core. If you're assuming the socket to have one core (as we were planning for s390x), that doesn't make much of a difference number-wise, but it does in modeling terms. Think what you can physically plug onto the mainboard, that's the granularity that realized=true/false is going to operate on. A virtual socket may well correspond to a thread on some socket/node of the host, but you cannot add threads to a core or cores to a chip at runtime. On x86 this may become a functional limitation of what is possible through cpu-add, so better avoid that mistake for ppc from the start. Regards, Andreas > - Using Gu Zheng's "reclaim vCPU objects" patch to remove and reuse > the vCPU objects after CPUs removal. > (Gu Zheng's original patch: > http://lists.gnu.org/archive/html/qemu-devel/2014-12/msg01829.html) [snip] -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Jennifer Guild, Dilip Upmanyu, Graham Norton; HRB 21284 (AG Nürnberg)
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