From patchwork Wed Jul 1 11:06:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 11636143 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 24178913 for ; Wed, 1 Jul 2020 11:07:38 +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 0A9852067D for ; Wed, 1 Jul 2020 11:07:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A9852067D 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 1jqaaA-0006no-KP; Wed, 01 Jul 2020 11:07:14 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jqaaA-0006nj-74 for xen-devel@lists.xenproject.org; Wed, 01 Jul 2020 11:07:14 +0000 X-Inumbo-ID: 040de5bc-bb8b-11ea-bca7-bc764e2007e4 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 040de5bc-bb8b-11ea-bca7-bc764e2007e4; Wed, 01 Jul 2020 11:07:13 +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 C3C48AC79; Wed, 1 Jul 2020 11:07:12 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v2 0/4] Remove 32-bit Xen PV guest support Date: Wed, 1 Jul 2020 13:06:46 +0200 Message-Id: <20200701110650.16172-1-jgross@suse.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 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: Juergen Gross , Stefano Stabellini , Deep Shah , "VMware, Inc." , Ingo Molnar , Borislav Petkov , Andy Lutomirski , "H. Peter Anvin" , Thomas Gleixner , Boris Ostrovsky Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" 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. Changes in V2: - rebase to 5.8 kernel - addressed comments to V1 - new patches 3 and 4 Juergen Gross (4): x86/xen: remove 32-bit Xen PV guest support x86/paravirt: remove 32-bit support from PARAVIRT_XXL x86/paravirt: cleanup paravirt macros x86/paravirt: use CONFIG_PARAVIRT_XXL instead of CONFIG_PARAVIRT arch/x86/entry/entry_32.S | 109 +------ arch/x86/entry/entry_64.S | 4 +- arch/x86/entry/vdso/vdso32/vclock_gettime.c | 1 + arch/x86/include/asm/fixmap.h | 2 +- arch/x86/include/asm/paravirt.h | 107 +----- arch/x86/include/asm/paravirt_types.h | 21 -- arch/x86/include/asm/pgtable-3level_types.h | 5 - arch/x86/include/asm/proto.h | 2 +- arch/x86/include/asm/required-features.h | 2 +- arch/x86/include/asm/segment.h | 6 +- arch/x86/kernel/cpu/common.c | 8 - arch/x86/kernel/head_32.S | 31 -- arch/x86/kernel/kprobes/core.c | 1 - arch/x86/kernel/kprobes/opt.c | 1 - arch/x86/kernel/paravirt.c | 18 -- arch/x86/kernel/paravirt_patch.c | 17 - arch/x86/xen/Kconfig | 3 +- arch/x86/xen/Makefile | 3 +- arch/x86/xen/apic.c | 17 - arch/x86/xen/enlighten_pv.c | 52 +-- arch/x86/xen/mmu_pv.c | 340 +++----------------- arch/x86/xen/p2m.c | 6 +- arch/x86/xen/setup.c | 35 +- arch/x86/xen/smp_pv.c | 18 -- arch/x86/xen/xen-asm.S | 182 ++++++++++- arch/x86/xen/xen-asm_32.S | 185 ----------- arch/x86/xen/xen-asm_64.S | 181 ----------- arch/x86/xen/xen-head.S | 6 - drivers/xen/Kconfig | 4 +- 29 files changed, 232 insertions(+), 1135 deletions(-) delete mode 100644 arch/x86/xen/xen-asm_32.S delete mode 100644 arch/x86/xen/xen-asm_64.S