Re: [Qemu-devel] [PATCH RFC V5 6/9] hw/intc: arm_gicv3_spi_its

[Shlomo Pongratz]

I just wanted to understand. I don't have any preferences.

On Wednesday, October 21, 2015, Pavel Fedin <address@hidden> wrote:
>  Hello!
>
> > As far as I understand Figure 1 in GICv3 architecture document the interrupts from device goes to the distributor and from it to the
> > re-distributors or from the deices via the ITS to the re-distributors.
> > So eventually ITS should be part of the GIC. That is if the ITS is a different entity how do you see it work with the rest of the GIC?
>
>  Easy. As i said before, what ITS actually does is transforming device ID + event ID into a single LPI number. Then, an LPI goes to the redistributor. Therefore, all we need from GIC is a method like inject_lpi(int lpi). Well, may be a couple more, for moving LPIs between collections. But this is not a problem and makes up a nice interface.
>  Even on the picture you mentioned ITS is a kind of separate thing. It can even be completely missing.
>
>  Well, my reasons end here. If you still disagree... Do what you want then, it will not be a problem to remove these unused stubs.
>  Peter, we are summoning you. :)
>
> Kind regards,
> Pavel Fedin
> Expert Engineer
> Samsung Electronics Research center Russia