[Xen-devel] Question. Inject virq to Domain on Xen ARM.

[ììì <supsup5642@xxxxxxxxx>]

HI

I have a question about Inject virq to Domain on Xen ARM.

 

Function 'vgic_vcpu_inject_irq' is inject virq to target vcpu.

At the end of vgic_vcpu_inject_irq, like below

--------------------------------------------------------------

running = v->is_running;

vcpu_unblock(v); 

if ( running && v != current )

        smp_send_event_check_mask(cpumask_of(v->processor)); 

--------------------------------------------------------------

In code if target vcpu is not current, send SGI to v->processor;

 

I think this function help inject virq to target vcpu immediately in Xen 4.5.0.

In Xen 4.5.0, vcpu that receive SGI, will execute 'enter_hypervisor_head' function

and move irq from lr_queue to linked register. 

 

But I think that in Xen 4.4.X above code is not help inject virq. because there is code

to move irq from lr_queue to linked register in hyp handler routine.

 

Thanks

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