Re: [Xen-devel] [PATCH v3 01/11] x86/domctl: Add XEN_DOMCTL_set_avail_vcpus

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.11.16 at 11:31, <JBeulich@xxxxxxxx> wrote:
>>>> On 21.11.16 at 22:00, <boris.ostrovsky@xxxxxxxxxx> wrote:
>> This domctl is called when a VCPU is hot-(un)plugged to a guest (via
>> 'xl vcpu-set').
>> 
>> The primary reason for adding this call is because for PVH guests
>> the hypervisor needs to send an SCI and set GPE registers. This is
>> unlike HVM guests that have qemu to perform these tasks.
> 
> And the tool stack can't do this?

For the avoidance of further misunderstandings: Of course likely
not completely on its own, but by using a (to be introduced) more
low level hypervisor interface (setting arbitrary GPE bits, with SCI
raised as needed, or the SCI raising being another hypercall).

Jan


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