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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 C4480C352A3 for ; Tue, 11 Feb 2020 15:13:16 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 976E120870 for ; Tue, 11 Feb 2020 15:13:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="rpKcXxMg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 976E120870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=VjMGqWYuS9pChR1wr4WVxN5ayJzDXe726wmHtpcU6+U=; b=rpKcXxMgFBThoG zgyPtl1gioMILyfdL9gif5h11SC5mYpARgvAK8DxS4iHpkU7NPm94Ylp7AZ7afIqHhjeqVo2qbHWT B5lzYvezt69DyKYHE53iEAH1y/SA9KmqnEhzvDyfYWEa0iznigwnmq8o+Z8Xx7CsoYQMf+aGhQIiZ OObVVSLtOCqyp7I0zXYdRJIBhtB7ABh4kBSgcVfEZZWvK0EsK6dU7y9q/CBrJN/pyNSQ7UBACjkD1 TE+NdYcn+4MjzJavy0yPeCQKajQISEFT+CgJEsT/yR6nkYTqBtE4pOR/8XLio3Rdwe1S20zYPbw4C 5+uaoltFOCv2UiQps1cw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j1XDp-0005LO-RM; Tue, 11 Feb 2020 15:13:09 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j1XDm-0005Jg-Bs for linux-arm-kernel@lists.infradead.org; Tue, 11 Feb 2020 15:13:07 +0000 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 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-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200211_071306_452606_9D06EE13 X-CRM114-Status: GOOD ( 17.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anders Berg , Russell King , Arnd Bergmann , Suzuki K Poulose , Quentin Perret , Christoffer Dall , James Morse , Paolo Bonzini , Will Deacon , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel