[pve-devel] RFC : qemu-server : add cpu_hotplug

[Stefan Priebe - Profihost AG]

Hi Alexendre,

Am 07.01.2014 09:36, schrieb Alexandre DERUMIER:
>>> I don't known if the event is the same for kvm cpu hotplug. 
> 
> This udev rule is working (I take it from opensuse and rhel)
> 
> 80-hotplug-cpu-mem.rules
> 
> # Hotplug physical CPU
> SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", \
>  ATTR{online}="1"
> 
> # Hotplug physical memory
> SUBSYSTEM=="memory", ACTION=="add", TEST=="state", ATTR{state}=="offline", \
>  ATTR{state}="online"
> 
> 
> Don't work with debian wheezy (3.10 kernel), but work with jessie. (So maybe it's udev version related).
> Works out of the box with rhel7 guest.

You mean wheezy 3.2 Kernel? It does not have a 3.10 Kernel.

Does this mean, that memory hotplug works too?

Stefan


> 
> ----- Mail original ----- 
> 
> De: "Alexandre DERUMIER" <aderumier at odiso.com> 
> À: pve-devel at pve.proxmox.com 
> Envoyé: Mardi 7 Janvier 2014 07:06:48 
> Objet: Re: [pve-devel] RFC : qemu-server : add cpu_hotplug 
> 
>>> (I'm not sure,but maybe this could be done auto with qemu-ga) 
> 
> I see some guy doing it with qemu-ga, but maybe it's also possible with a clean udev rule in guest. 
> 
> 
> xen is doing it with this udev rules 
> 
> SUBSYSTEM=="cpu",ACTION=="add",RUN+="/bin/sh -c '[ ! -e /sys$devpath/online ] || echo 1 > /sys$devpath/online'" 
> 
> I don't known if the event is the same for kvm cpu hotplug. 
> 
> 
> 
> ----- Mail original ----- 
> 
> De: "Alexandre Derumier" <aderumier at odiso.com> 
> À: pve-devel at pve.proxmox.com 
> Envoyé: Lundi 6 Janvier 2014 17:56:46 
> Objet: [pve-devel] RFC : qemu-server : add cpu_hotplug 
> 
> Theses patches are cpu_hotplug feature. 
> 
> unplug is not yet available in current qemu. 
> 
> This introduce a new "maxcpus" config value. 
> 
> If maxcpus is defined, sockets should be set to 1, as we can only hotplug 1cpu/core step by step, up to maxcpus value. 
> 
> Tested under debian with kernel 3.2. 
> 
> cpu need to be enabled after hotplug in guest with "echo 1 > /sys/devices/system/cpu/cpuX/online". 
> (I'm not sure,but maybe this could be done auto with qemu-ga) 
> 
> 
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