[libvirt] [PATCH] Support CPU less NUMA node.

[Peter Krempa]

On Thu, Apr 20, 2017 at 19:22:49 +0800, Feng, Shaohe wrote:
> Thanks Peter for the comments.
> Will update it in the next version.
> 
> On 2017年04月20日 19:17, Peter Krempa wrote:
> > On Thu, Apr 20, 2017 at 03:49:29 +0000, Shaohe Feng wrote:
> > > Some platform NUMA node does not include cpu, such as Phi.
> > > 
> > > This patch support CPU less NUMA node.
> > > But there must be one CPU cell node for a guest.
> > > Also must assign the host nodeset for this guest cell node.
> > Additionally to the review below:
> > 
> > Did qemu always support this? If not, you need to add code which will
> > allow such configuration only if qemu supports this (adding a capability
> > bit etc ...).
> need to check it.
> > Also please elaborat how is this better than adding a regular numa node
> > whith cpus which are disabled. In such case you can still add more cpus
> > via the hotplug API in case you desire so.
> do you means add an extra attribute "disable" for cpus?
> such as
> 
> <cell id='1' cpus="" cpu_disable="true" "memory='512000' unit='KiB'/>

Why would you do that? You can specify cpus="some-sane-cpu-set" and then
using the <vcpus> element disable the given set.

See http://libvirt.org/formatdomain.html#elementsCPUAllocation

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