From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40440) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YmjK3-0006rE-TK for qemu-devel@nongnu.org; Mon, 27 Apr 2015 09:43:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YmjJy-0000ft-Fn for qemu-devel@nongnu.org; Mon, 27 Apr 2015 09:43:43 -0400 Received: from mail-ig0-f182.google.com ([209.85.213.182]:37987) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YmjJy-0000fi-CL for qemu-devel@nongnu.org; Mon, 27 Apr 2015 09:43:38 -0400 Received: by igbhj9 with SMTP id hj9so61888267igb.1 for ; Mon, 27 Apr 2015 06:43:37 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20150427134117.GA29088@lvm> References: <1428528060-17896-1-git-send-email-christoffer.dall@linaro.org> <1428528060-17896-3-git-send-email-christoffer.dall@linaro.org> <20150427134117.GA29088@lvm> From: Peter Maydell Date: Mon, 27 Apr 2015 14:43:17 +0100 Message-ID: Content-Type: text/plain; charset=UTF-8 Subject: Re: [Qemu-devel] [PATCH 2/3] arm_gicv2m: Add GICv2m widget to support MSIs List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Christoffer Dall Cc: QEMU Developers , Eric Auger On 27 April 2015 at 14:41, Christoffer Dall 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