[pve-devel] qemu2.7: cpu hotplug && hot-unplug v1

[Alexandre DERUMIER]

Thanks Wolfgang, I'll test it next week.

----- Mail original -----
De: "Wolfgang Bumiller" <w.bumiller at proxmox.com>
À: "aderumier" <aderumier at odiso.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 7 Septembre 2016 09:02:13
Objet: Re: [pve-devel] qemu2.7: cpu hotplug && hot-unplug v1

I pushed my current qemu-2.7 WIP to github. 
It seems to work, still needs more testing & some cleanup (need to 
squash all those small fixes for the older patches together). 

I dropped the patch which adds support for a secondary server for 
glusterfs as qemu can do this now - with a different syntax. 
Although I haven't yet seen where we've been using this, or if at all? 

I keep the github branches mostly in sync with our patch directories: 
* The pve-2.7 branch contains the pve related patches based on the release 
we build on (in this case the tag v2.7.0-rc4), these are the patches in 
pve-qemu-kvm's debian/patches/pve/ directory. 
* The extra-2.7 branch is always based on the pve branch and contains 
patches from the qemu-stable/devel list (stable fixes, cve fixes etc.) 

On Tue, Sep 06, 2016 at 12:41:52PM +0200, Alexandre Derumier wrote: 
> Hi, 
> This patch series implement new qemu 2.7 cpu hotplug framework, with device_add|device_del 
> 
> hot-unplug is working now ! 
> 
> config example: 
> --------------- 
> cpu: kvm64 
> sockets:2 
> cores:2 
> 
> generate cmdline 
> ---------------- 
> -cpu kvm64,+lahf_lm,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,enforce 
> -smp 1,sockets=2,cores=2,maxcpus=4 
> -device kvm64-x86_64-cpu,id=cpu2,socket-id=0,core-id=1,thread-id=0 
> -device kvm64-x86_64-cpu,id=cpu3,socket-id=1,core-id=0,thread-id=0 
> -device kvm64-x86_64-cpu,id=cpu4,socket-id=1,core-id=1,thread-id=0 
> 
> 
> First core is not hotpluggable (-smp 1). (socket-id=0,core-id=0) 
> Others cores are added with -device, with cpumodel,socket-id && core-id. 
> 
> cpuflags are defined globally in -cpu , and are auto applied on hotplug 
> 
> Tested with debian jessie, kernel 3.16. 
> 
> This new config is only apply with machine 2.7+cpu hotplug enabled, as it break live migration. 
> 
> 
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