On Friday, October 14, 2016 10:13 PM, Paolo Bonzini wrote:
> On 14/10/2016 16:00, Wang, Wei W wrote:
> >> Why would you do that instead of just using the local APIC?...
> >
> > The interrupt will be delivered to LAPIC - the hypercall hander
> > injects the interrupt via kvm_set_irq(kvm, GSI,..), which finally uses
> > LAPIC, right?
>
> But why do you need that? You can just deliver it to the appropriate local APIC
> interrupt, there's no need to know the GSI. The guest knows how it has
> configured the GSIs.
>
> You haven't explained the use case.
Sure. One example here is to send an interrupt from a virtio driver (e.g. the vhost-pci-net that we are working on) on a guest to a virtio-net device on another guest. In terms of injecting an interrupt to the virtio-net device, should we give the sender the related GSI assigned to the virtio-net device (i.e. the GSI of an RX queue, to notify the virtio-net driver to receive packets from that RX queue)?
Can you please explain more about "just delivering it to the appropriate local APIC"? What would be source of the interrupt that we are injecting to? Thanks.
Best,
Wei
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