From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78D4BC352A3 for ; Tue, 11 Feb 2020 15:13:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4AE262086A for ; Tue, 11 Feb 2020 15:13:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730175AbgBKPM7 (ORCPT ); Tue, 11 Feb 2020 10:12:59 -0500 Received: from foss.arm.com ([217.140.110.172]:47498 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728825AbgBKPM7 (ORCPT ); Tue, 11 Feb 2020 10:12:59 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5C08A30E; Tue, 11 Feb 2020 07:12:58 -0800 (PST) Received: from [10.1.32.161] (e121487-lin.cambridge.arm.com [10.1.32.161]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7B07A3F68E; Tue, 11 Feb 2020 07:12:55 -0800 (PST) Subject: Re: [RFC PATCH 0/5] Removing support for 32bit KVM/arm host To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: James Morse , Julien Thierry , Suzuki K Poulose , Paolo Bonzini , Christoffer Dall , Will Deacon , Quentin Perret , Russell King , Anders Berg , Arnd Bergmann References: <20200210141324.21090-1-maz@kernel.org> From: Vladimir Murzin Message-ID: Date: Tue, 11 Feb 2020 15:12:53 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20200210141324.21090-1-maz@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 2/10/20 2:13 PM, Marc Zyngier wrote: > KVM/arm was merged just over 7 years ago, and has lived a very quiet > life so far. It mostly works if you're prepared to deal with its > limitations, it has been a good prototype for the arm64 version, > but it suffers a few problems: > > - It is incomplete (no debug support, no PMU) > - It hasn't followed any of the architectural evolutions > - It has zero users (I don't count myself here) > - It is more and more getting in the way of new arm64 developments > > So here it is: unless someone screams and shows that they rely on > KVM/arm to be maintained upsteam, I'll remove 32bit host support > form the tree. One of the reasons that makes me confident nobody is > using it is that I never receive *any* bug report. Yes, it is perfect. > But if you depend on KVM/arm being available in mainline, please shout. > > To reiterate: 32bit guest support for arm64 stays, of course. Only > 32bit host goes. Once this is merged, I plan to move virt/kvm/arm to > arm64, and cleanup all the now unnecessary abstractions. > > The patches have been generated with the -D option to avoid spamming > everyone with huge diffs, and there is a kvm-arm/goodbye branch in > my kernel.org repository. > > Marc Zyngier (5): > arm: Unplug KVM from the build system > arm: Remove KVM from config files > arm: Remove 32bit KVM host support > arm: Remove HYP/Stage-2 page-table support > arm: Remove GICv3 vgic compatibility macros Acked-by: Vladimir Murzin