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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 5D7CFC76191 for ; Mon, 15 Jul 2019 11:37:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 35282206B8 for ; Mon, 15 Jul 2019 11:37:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729938AbfGOLht (ORCPT ); Mon, 15 Jul 2019 07:37:49 -0400 Received: from mx2.suse.de ([195.135.220.15]:52770 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729847AbfGOLhq (ORCPT ); Mon, 15 Jul 2019 07:37:46 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 996C8ADBF; Mon, 15 Jul 2019 11:37:44 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Cc: Juergen Gross , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Boris Ostrovsky , Stefano Stabellini , Alok Kataria Subject: [PATCH 0/2] Remove 32-bit Xen PV guest support Date: Mon, 15 Jul 2019 13:37:37 +0200 Message-Id: <20190715113739.17694-1-jgross@suse.com> X-Mailer: git-send-email 2.16.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 arch/x86/entry/entry_32.S | 93 -------- arch/x86/entry/vdso/vdso32/vclock_gettime.c | 1 + arch/x86/include/asm/paravirt.h | 105 +-------- arch/x86/include/asm/paravirt_types.h | 20 -- arch/x86/include/asm/pgtable-3level_types.h | 5 - arch/x86/include/asm/proto.h | 2 +- arch/x86/include/asm/segment.h | 2 +- arch/x86/include/asm/traps.h | 2 +- arch/x86/kernel/cpu/common.c | 8 - arch/x86/kernel/paravirt.c | 17 -- arch/x86/kernel/paravirt_patch_32.c | 36 +-- arch/x86/xen/Kconfig | 3 +- arch/x86/xen/Makefile | 4 +- arch/x86/xen/apic.c | 17 -- arch/x86/xen/enlighten_pv.c | 45 +--- arch/x86/xen/mmu_pv.c | 326 +++------------------------- arch/x86/xen/p2m.c | 4 - arch/x86/xen/setup.c | 44 +--- arch/x86/xen/smp_pv.c | 19 +- arch/x86/xen/xen-asm.S | 14 -- arch/x86/xen/xen-asm_32.S | 207 ------------------ arch/x86/xen/xen-head.S | 6 - arch/x86/xen/xen-ops.h | 5 - drivers/xen/Kconfig | 4 +- 24 files changed, 57 insertions(+), 932 deletions(-) delete mode 100644 arch/x86/xen/xen-asm_32.S -- 2.16.4