Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754170AbaLVJHg (ORCPT ); Mon, 22 Dec 2014 04:07:36 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:52768 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754004AbaLVJHe (ORCPT ); Mon, 22 Dec 2014 04:07:34 -0500 Message-ID: <5497DF4C.4000104@arm.com> Date: Mon, 22 Dec 2014 09:07:24 +0000 From: Marc Zyngier User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.2.0 MIME-Version: 1.0 To: Arnd Bergmann , "linux-arm-kernel@lists.infradead.org" CC: Mark Rutland , Eddie Huang , "devicetree@vger.kernel.org" , Jason Cooper , Pawel Moll , Ian Campbell , Catalin Marinas , Olof Johansson , Will Deacon , "linux-kernel@vger.kernel.org" , Robert Richter , "srv_heupstream@mediatek.com" , Rob Herring , Sascha Hauer , Kumar Gala , Matthias Brugger , "Joe.C" , Thomas Gleixner , Mark Brown Subject: Re: [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 SoC and evaluation board dts and Makefile References: <1418825853-10934-1-git-send-email-eddie.huang@mediatek.com> <20141217143305.GC8942@leverpostej> <54919AC9.2090306@arm.com> <3669965.zfJEHTFEBI@wuerfel> In-Reply-To: <3669965.zfJEHTFEBI@wuerfel> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 20/12/14 20:07, Arnd Bergmann wrote: > On Wednesday 17 December 2014 15:01:29 Marc Zyngier wrote: >> >> Indeed, as described in the documentation: >> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0471b/CHDIFAEE.html >> >> Also it is worth noticing that given how GICV is placed, it will never >> work with 64K pages and virtualization. Pretty sad. > > Does this mean no VGIC support on this platform so you have to emulate it > in order to run virtual machines with 64K pages, or does it mean that > it's impossible to use that way because you can't emulate it? As Peter said, this is not a configuration we're willing to support: - we don't have a API to tell userspace emulation about interrupts generated by the generic timers - we could move the whole GIC emulation into the kernel (at the moment, only the distributor is there), but that would be a complete nightmare It really looks like a case of "let's drop a bunch of 64bit cores into an existing SoC". Shame people can't read integration guidelines... M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/