Re: [Qemu-devel] [PATCH 2/3] arm_gicv2m: Add GICv2m widget to support MSIs

[Peter Maydell]

On 27 April 2015 at 14:41, Christoffer Dall <address@hidden> wrote:
> Regarding adding support for the security extensions later, I assume the
> QEMU-specifics will be to add a flag to the device instantiation from
> the containing board activating security support, which would grow the
> IO region size of this device from 4K to 8K for an adjacent secure
> register frame and adjust the offsets.  I cannot think of a reason why
> that wouldn't work backwards-compatibly?

I think you'd probably want to add a second MMIO region rather
than making the first one double-size. I don't think there's anything
in the spec that mandates them being adjacent. You also need to allocate
more interrupt lines.

I think this should all be backwards-compatible, yes.

thanks
-- PMM