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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 C345FC7618F for ; Mon, 15 Jul 2019 12:32:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 848E92081C for ; Mon, 15 Jul 2019 12:32:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="aEybarIk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730015AbfGOMcZ (ORCPT ); Mon, 15 Jul 2019 08:32:25 -0400 Received: from merlin.infradead.org ([205.233.59.134]:46058 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728933AbfGOMcY (ORCPT ); Mon, 15 Jul 2019 08:32:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=IZmADf5/xR5R3mmqabrQ4fHdojbS9pEGiQhr85URq6M=; b=aEybarIkTFSF6XayXEm9oTybN bRM340R6NHNLm2LEYd9DXp+8WWywggz0CuALF0J1wDzPuVxYFHl5h/Jw4SbiTUAtP+p3zqM/a6Lca uWAH/o4UXolDp6pR2+auZSFsE7irfkrG9l09A5kXNeTbBAkAuv9b3pSh6LV69G8TU2UFR19P7dSHs BP/piakMXAWFL9OGZtkRexsPfwx3DEGrBE5V6cPibP0GfHeoDmoIkzc3BID6B4OgeBLXPSMp7WZ2w RoSrOscOWXXcDUJRqOdN97QTU1LKAIpoBiSQ+oHxTwaZ5aC5ON7p97SNIWay0hnMAhwYsz9qoBbqS 6ZKU8MzGQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hn09K-0002Kz-NY; Mon, 15 Jul 2019 12:32:10 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id E2AA820144520; Mon, 15 Jul 2019 14:32:07 +0200 (CEST) Date: Mon, 15 Jul 2019 14:32:07 +0200 From: Peter Zijlstra To: Juergen Gross Cc: xen-devel@lists.xenproject.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Boris Ostrovsky , Stefano Stabellini , Alok Kataria Subject: Re: [PATCH 0/2] Remove 32-bit Xen PV guest support Message-ID: <20190715123207.GE3419@hirez.programming.kicks-ass.net> References: <20190715113739.17694-1-jgross@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190715113739.17694-1-jgross@suse.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 15, 2019 at 01:37:37PM +0200, 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. > > Juergen Gross (2): > x86/xen: remove 32-bit Xen PV guest support > x86/paravirt: remove 32-bit support from PARAVIRT_XXL Hooray!