Re: [Xen-devel] [PATCH v2 01/11] x86/domctl: Add XEN_DOMCTL_set_avail_vcpus

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.11.16 at 15:39, <boris.ostrovsky@xxxxxxxxxx> wrote:
> This domctl is called when a VCPU is hot-(un)plugged to a guest (via
> 'xl vcpu-set'). While this currently is only intended to be needed by
> PVH guests we will call this domctl for all (x86) guests for consistency.

The discussion on the actual change seems to have pointed out all
needs of change, but what I wasn't able to understand yet is why
this is needed in the first place. From hypervisor pov, so far it's been
up to the guest which CPUs get onlined/offlined, and the interface
to request offlining (not an issue for onlining) was - afaict - a purely
voluntary one. Why does this change with PVH? Any such ratonale
should be put in the commit message.

Jan


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