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Re: [Xen-devel] [RFC PATCH v2 13/22] xen/arm: its: Add virtual ITS command support
- To: Julien Grall <julien.grall@xxxxxxxxxx>
- From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
- Date: Thu, 30 Apr 2015 11:50:50 +0100
- Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>, Vijay Kilari <vijay.kilari@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Prasun Kapoor <Prasun.Kapoor@xxxxxxxxxxxxxxxxxx>, Vijaya Kumar K <vijaya.kumar@xxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>, manish.jaggi@xxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 30 Apr 2015 10:51:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Thu, 30 Apr 2015, Julien Grall wrote:
> On 30/04/2015 11:15, Stefano Stabellini wrote:
> > > As said earlier, the number of DevBits implemented by the ITS can be
> > > limited
> > > (see GITS_TYPER.Devbits).
> > >
> > > If the devid is not within this range, the ITS won't recognize the value
> > > and
> > > won't be able to send the interrupt.
> > >
> > > So this is clearly not the right value.
> >
> > Sure, in that case the maximum value allowed by GITS_TYPER.Devbits.
> > Vijay, what is the value of GITS_TYPER.Devbits on your platform?
>
> How can you be sure that this value won't be use for a device on this
> platform?
It really depends on the platform: if GITS_TYPER.Devbits is much higher
than the number of hotpluggable devices, then we are fine. If it is
exactly identical, we need to return error on the last device hotplug.
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