From patchwork Fri Nov 20 11:46:18 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: 11920163 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=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 6612FC5519F for ; Fri, 20 Nov 2020 11:47:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0619B22253 for ; Fri, 20 Nov 2020 11:47:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="rHmTXjwV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727409AbgKTLqg (ORCPT ); Fri, 20 Nov 2020 06:46:36 -0500 Received: from mx2.suse.de ([195.135.220.15]:55910 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727263AbgKTLqf (ORCPT ); Fri, 20 Nov 2020 06:46:35 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1605872794; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=fjHe3+rmjY5cASW1XAPrcDHWzGbizvpE61ZYWB4j3cw=; b=rHmTXjwVBmFJKyhCEqOmhgg9FGZswY8WJdm/UueRf8DddoT49obCKWkkpulXZkEmbMyr53 +tF6wEHiJQUjLKUN11yRtxzw2OPKHPWiM+6wvnAdRmBLFldnpbyUuBKOY+QFrHkVnZVwFO BIZuxt25L9jBmyI/EuK0mKwTZgHx17c= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C23BCAD57; Fri, 20 Nov 2020 11:46:33 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org Cc: peterz@infradead.org, luto@kernel.org, Juergen Gross , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Boris Ostrovsky , Stefano Stabellini , Deep Shah , "VMware, Inc." , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Daniel Lezcano , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira Subject: [PATCH v2 00/12] x86: major paravirt cleanup Date: Fri, 20 Nov 2020 12:46:18 +0100 Message-Id: <20201120114630.13552-1-jgross@suse.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This is a major cleanup of the paravirt infrastructure aiming at eliminating all custom code patching via paravirt patching. This is achieved by using ALTERNATIVE instead, leading to the ability to give objtool access to the patched in instructions. In order to remove most of the 32-bit special handling from pvops the time related operations are switched to use static_call() instead. At the end of this series all paravirt patching has to do is to replace indirect calls with direct ones. In a further step this could be switched to static_call(), too, but that would require a major header file disentangling. Note that an updated objtool is needed for this series, as otherwise lots of warnings due to alternative instructions modifying the stack will be issued during the build. Changes in V2: - added patches 5-12 Juergen Gross (12): x86/xen: use specific Xen pv interrupt entry for MCE x86/xen: use specific Xen pv interrupt entry for DF x86/pv: switch SWAPGS to ALTERNATIVE x86/xen: drop USERGS_SYSRET64 paravirt call x86: rework arch_local_irq_restore() to not use popf x86/paravirt: switch time pvops functions to use static_call() x86: add new features for paravirt patching x86/paravirt: remove no longer needed 32-bit pvops cruft x86/paravirt: switch iret pvops to ALTERNATIVE x86/paravirt: add new macros PVOP_ALT* supporting pvops in ALTERNATIVEs x86/paravirt: switch functions with custom code to ALTERNATIVE x86/paravirt: have only one paravirt patch function arch/x86/Kconfig | 1 + arch/x86/entry/entry_32.S | 4 +- arch/x86/entry/entry_64.S | 32 ++-- arch/x86/include/asm/cpufeatures.h | 3 + arch/x86/include/asm/idtentry.h | 6 + arch/x86/include/asm/irqflags.h | 51 ++---- arch/x86/include/asm/mshyperv.h | 11 -- arch/x86/include/asm/paravirt.h | 170 ++++++-------------- arch/x86/include/asm/paravirt_time.h | 38 +++++ arch/x86/include/asm/paravirt_types.h | 222 ++++++++++++-------------- arch/x86/kernel/Makefile | 3 +- arch/x86/kernel/alternative.c | 30 +++- arch/x86/kernel/asm-offsets.c | 8 - arch/x86/kernel/asm-offsets_64.c | 3 - arch/x86/kernel/cpu/vmware.c | 5 +- arch/x86/kernel/head_64.S | 2 - arch/x86/kernel/irqflags.S | 11 -- arch/x86/kernel/kvm.c | 3 +- arch/x86/kernel/kvmclock.c | 3 +- arch/x86/kernel/paravirt.c | 70 +++----- arch/x86/kernel/paravirt_patch.c | 109 ------------- arch/x86/kernel/tsc.c | 3 +- arch/x86/xen/enlighten_pv.c | 36 +++-- arch/x86/xen/irq.c | 23 --- arch/x86/xen/time.c | 12 +- arch/x86/xen/xen-asm.S | 52 +----- arch/x86/xen/xen-ops.h | 3 - drivers/clocksource/hyperv_timer.c | 5 +- drivers/xen/time.c | 3 +- kernel/sched/sched.h | 1 + 30 files changed, 325 insertions(+), 598 deletions(-) create mode 100644 arch/x86/include/asm/paravirt_time.h delete mode 100644 arch/x86/kernel/paravirt_patch.c Signed-off-by: Peter Zijlstra (Intel)