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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 27EDEC433DF for ; Thu, 2 Jul 2020 08:18:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC01E20720 for ; Thu, 2 Jul 2020 08:18:54 +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="0O81avXC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727870AbgGBISx (ORCPT ); Thu, 2 Jul 2020 04:18:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726408AbgGBISx (ORCPT ); Thu, 2 Jul 2020 04:18:53 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1837BC08C5C1 for ; Thu, 2 Jul 2020 01:18:53 -0700 (PDT) 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; bh=B95rbPlWjlDan7UytKGhRhe4eiuia9yaCCRRm9SGDcc=; b=0O81avXCjZeiwbdfkjY5QlweSc OQ1RJ9hkyqKUbu32+ayp8uy/9wwehfsmaa6JgjzTXqrZDwMe7+J+xA6TVJgyB1IizYyvcg7Uqxa54 rIfaVVlmjsmzRQNkvd4T961eKkAkBlqBXGyaPKzDdA9vN+hRjG6G7d75lRc5zzbaSch8W70HOCU3Z a9agVIRMnyCH4b8YR0I28/x4345sHesBKM1ejKjKjsuqcAqyRZmAENAMwrAm501XiELmJ968TlWC8 y6LOGcle+GcGrL24+mw6FN7w1VaaDJmgRSs6DJxof8IcowO2aKXxCp/5goZG43+T+9PCAmIBQUNKj 7F9v0j+Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jquQQ-0005pZ-FU; Thu, 02 Jul 2020 08:18:30 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id C53083003D8; Thu, 2 Jul 2020 10:18:27 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id AA0AE264F8CB2; Thu, 2 Jul 2020 10:18:27 +0200 (CEST) Date: Thu, 2 Jul 2020 10:18:27 +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 , Deep Shah , "VMware, Inc." Subject: Re: [PATCH v2 0/4] Remove 32-bit Xen PV guest support Message-ID: <20200702081827.GA4781@hirez.programming.kicks-ass.net> References: <20200701110650.16172-1-jgross@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200701110650.16172-1-jgross@suse.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 01, 2020 at 01:06:46PM +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. Hooray!!! Much thanks!