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



Hi,

On 01/12/2018 01:33, Christopher Clark 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 am a bit confused. vIRQs are based on event channel, so how do you 
remove the requirement on event channel?

Cheers,

-- 
Julien Grall
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