From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751262AbdGMJ0n (ORCPT ); Thu, 13 Jul 2017 05:26:43 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:36056 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750854AbdGMJ0m (ORCPT ); Thu, 13 Jul 2017 05:26:42 -0400 Subject: Re: [RFC 0/2] arm-smmu-v3 tlbi-on-map option To: "Michael S. Tsirkin" , Will Deacon Cc: Eric Auger , eric.auger.pro@gmail.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, robin.murphy@arm.com, christoffer.dall@linaro.org, Marc.Zyngier@arm.com, alex.williamson@redhat.com, peterx@redhat.com References: <1499613303-30173-1-git-send-email-eric.auger@redhat.com> <20170712175454.GF15191@arm.com> <20170712223654-mutt-send-email-mst@kernel.org> From: Jean-Philippe Brucker Message-ID: Date: Thu, 13 Jul 2017 10:29:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <20170712223654-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/07/17 23:07, Michael S. Tsirkin wrote: [...] > I think using hardware support for nesting is the right final > solution. It will take some time though. Given this, what should > we do meanwhile? > > Assuming that's the final destination, a simple quirk like this > seems to be preferable to virtio-iommu which we'll never be > able to offload to hardware. That's not entirely true. virtio-iommu will have an extension for hardware nesting support. It was presented in my initial proposal, and I've made significant progress since then. Thanks, Jean