Re: [PATCH v5 01/10] hw/intc: GICv3 ITS initial framework

[Peter Maydell <peter.maydell@linaro.org>]

On Mon, 5 Jul 2021 at 16:55, <shashi.mallela@linaro.org> wrote:
>
> On Mon, 2021-07-05 at 15:58 +0100, Peter Maydell wrote:
> > On Wed, 30 Jun 2021 at 16:32, Shashi Mallela <
> > shashi.mallela@linaro.org> wrote:
> > > Added register definitions relevant to ITS,implemented overall
> > > ITS device framework with stubs for ITS control and translater
> > > regions read/write,extended ITS common to handle mmio init between
> > > existing kvm device and newer qemu device.
> > >
> > > Signed-off-by: Shashi Mallela <shashi.mallela@linaro.org>
> > > Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> > > +static void gicv3_arm_its_realize(DeviceState *dev, Error **errp)
> > > +{
> > > +    GICv3ITSState *s = ARM_GICV3_ITS_COMMON(dev);
> > > +
> > > +    gicv3_its_init_mmio(s, &gicv3_its_control_ops,
> > > &gicv3_its_translation_ops);
> > > +
> > > +    if (s->gicv3->cpu->gicr_typer & GICR_TYPER_PLPIS) {
> >
> > Can you remind me why we make this check, please? When would we
> > have created an ITS device but not have a GICv3 with LPI support?
> This check applies to GIC's physical LPI support only as against GIC's
> virtual LPI support.

Right, but when would we have a GIC with no physical LPI support
but an ITS is present ?

thanks
-- PMM