Re: [Xen-devel] [PATCH 23/25] argo: signal x86 HVM and ARM via VIRQ

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.12.18 at 02:33, <christopher.w.clark@xxxxxxxxx> wrote:
> * x86 PV domains are notified via event channel.
> 
> PV guests are known to have the event channel software present in the guest
> kernel, so it is fine to depend on and use it.
> 
> * x86 HVM domains and all ARM domains are notified via VIRQ.
> 
> The intent is to remove the requirement for event channel software to be
> installed within these guests in order to use Argo. VIRQ signalling is also
> the method that has been in use for the longest period with this hypercall
> in both XenClient and OpenXT.

I'm afraid I don't follow: send_guest_global_virq() uses, well,
evtchn_port_set_pending(), just like evtchn_send() does.
Therefore how does sending a vIRQ help with a guest without
event channel awareness?

Jan



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