Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932418AbcKHTKX (ORCPT ); Tue, 8 Nov 2016 14:10:23 -0500 Received: from foss.arm.com ([217.140.101.70]:39996 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932399AbcKHTKU (ORCPT ); Tue, 8 Nov 2016 14:10:20 -0500 Date: Tue, 8 Nov 2016 19:10:22 +0000 From: Will Deacon To: Don Dutile Cc: Auger Eric , Alex Williamson , drjones@redhat.com, jason@lakedaemon.net, kvm@vger.kernel.org, marc.zyngier@arm.com, benh@kernel.crashing.org, joro@8bytes.org, punit.agrawal@arm.com, linux-kernel@vger.kernel.org, arnd@arndb.de, diana.craciun@nxp.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, linux-arm-kernel@lists.infradead.org, jcm@redhat.com, tglx@linutronix.de, robin.murphy@arm.com, dwmw@amazon.co.uk, christoffer.dall@linaro.org, eric.auger.pro@gmail.com Subject: Re: Summary of LPC guest MSI discussion in Santa Fe Message-ID: <20161108191022.GA17771@arm.com> References: <1478209178-3009-1-git-send-email-eric.auger@redhat.com> <20161103220205.37715b49@t450s.home> <20161108024559.GA20591@arm.com> <20161108175457.GK20591@arm.com> <5822214F.2070500@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5822214F.2070500@redhat.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 548 Lines: 12 On Tue, Nov 08, 2016 at 02:02:39PM -0500, Don Dutile wrote: > On 11/08/2016 12:54 PM, Will Deacon wrote: > >A first step would be making all this opt-in, and only supporting GICv3 > >ITS for now. > You're trying to support a config that is < GICv3 and no ITS ? ... > That would be the equiv. of x86 pre-intr-remap, and that's why allow_unsafe_interrupts > hook was created ... to enable devel/kick-the-tires. Yup, that's exactly what I was envisaging. For systems that can't do passthrough safely, we'll always have to throw a devel switch. Will