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

[Alexandre Derumier]

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)