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=-2.5 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 8E3A3C433DF for ; Thu, 2 Jul 2020 15:45:59 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 6C08B20885 for ; Thu, 2 Jul 2020 15:45:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6C08B20885 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jr1Oy-0008K1-LI; Thu, 02 Jul 2020 15:45:28 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jr1Ox-0008Jw-0J for xen-devel@lists.xenproject.org; Thu, 02 Jul 2020 15:45:27 +0000 X-Inumbo-ID: 0be3cffe-bc7b-11ea-b7bb-bc764e2007e4 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 0be3cffe-bc7b-11ea-b7bb-bc764e2007e4; Thu, 02 Jul 2020 15:45:26 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 33EEAAEB1; Thu, 2 Jul 2020 15:45:25 +0000 (UTC) Subject: Re: [PATCH v2 0/4] Remove 32-bit Xen PV guest support To: Brian Gerst References: <20200701110650.16172-1-jgross@suse.com> From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Message-ID: Date: Thu, 2 Jul 2020 17:45:23 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Deep Shah , "VMware, Inc." , the arch/x86 maintainers , Linux Kernel Mailing List , Linux Virtualization , Ingo Molnar , Borislav Petkov , Andy Lutomirski , "H. Peter Anvin" , xen-devel , Thomas Gleixner , Boris Ostrovsky Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 02.07.20 16:48, Brian Gerst wrote: > On Wed, Jul 1, 2020 at 7:07 AM Juergen Gross wrote: >> >> The long term plan has been to replace Xen PV guests by PVH. The first >> victim of that plan are now 32-bit PV guests, as those are used only >> rather seldom these days. Xen on x86 requires 64-bit support and with >> Grub2 now supporting PVH officially since version 2.04 there is no >> need to keep 32-bit PV guest support alive in the Linux kernel. >> Additionally Meltdown mitigation is not available in the kernel running >> as 32-bit PV guest, so dropping this mode makes sense from security >> point of view, too. > > One thing that you missed is removing VDSO_NOTE_NONEGSEG_BIT from > vdso32/note.S. With that removed there is no difference from the > 64-bit version. Oh, this means we can probably remove arch/x86/xen/vdso.h completely. > > Otherwise this series looks good to me. Thanks, Juergen