From patchwork Tue Mar 9 13:48:01 2021 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: 12125351 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 AC0BAC433E9 for ; Tue, 9 Mar 2021 13:49:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 755C16521A for ; Tue, 9 Mar 2021 13:49:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231332AbhCINsz (ORCPT ); Tue, 9 Mar 2021 08:48:55 -0500 Received: from mx2.suse.de ([195.135.220.15]:51390 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231197AbhCINsW (ORCPT ); Tue, 9 Mar 2021 08:48:22 -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=1615297700; 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=95nQytiynjE+lgsCD540YiASmJmBTjnBSf2S8IR/Qxo=; b=eTOxo46U1RhOYqXDG/YlpXeiG3mLS1gXZT03GDvmXHlWw2A41vtoW6U87OFUK88uBhj8jV RYsSVHbP+7xSab4R9Ef5+rs9BdphzAAW2san7SPMMtY4hgtNyB/CkvRKIfSDf7TEgMCLzP /udQQc2plcCPrIq/so8hMX3DhKnWiBM= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C3B9FAC54; Tue, 9 Mar 2021 13:48:19 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, x86@kernel.org, virtualization@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, clang-built-linux@googlegroups.com Cc: Juergen Gross , Peter Zijlstra , Josh Poimboeuf , Jason Baron , Steven Rostedt , Ard Biesheuvel , Deep Shah , "VMware, Inc." , Russell King , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Boris Ostrovsky , Stefano Stabellini , Andy Lutomirski , Nathan Chancellor , Nick Desaulniers Subject: [PATCH v6 00/12] x86: major paravirt cleanup Date: Tue, 9 Mar 2021 14:48:01 +0100 Message-Id: <20210309134813.23912-1-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. Changes in V6: - switched back to "not" bit in feature value for "not feature" - other minor comments addressed Changes in V5: - patches 1-5 of V4 dropped, as already applied - new patches 1+3 - fixed patch 2 - split V4 patch 8 into patches 4+5 - use flag byte instead of negative feature bit for "not feature" Changes in V4: - fixed several build failures - removed objtool patch, as objtool patches are in tip now - added patch 1 for making usage of static_call easier - even more cleanup Changes in V3: - added patches 7 and 12 - addressed all comments Changes in V2: - added patches 5-12 Juergen Gross (12): static_call: move struct static_call_key definition to static_call_types.h x86/paravirt: switch time pvops functions to use static_call() x86/alternative: drop feature parameter from ALTINSTR_REPLACEMENT() x86/alternative: support not-feature x86/alternative: support ALTERNATIVE_TERNARY x86: add new features for paravirt patching x86/paravirt: remove no longer needed 32-bit pvops cruft x86/paravirt: simplify paravirt macros 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/arm/include/asm/paravirt.h | 14 +- arch/arm/kernel/paravirt.c | 9 +- arch/arm64/include/asm/paravirt.h | 14 +- arch/arm64/kernel/paravirt.c | 13 +- arch/x86/Kconfig | 1 + arch/x86/entry/entry_32.S | 4 +- arch/x86/entry/entry_64.S | 2 +- arch/x86/include/asm/alternative-asm.h | 7 + arch/x86/include/asm/alternative.h | 23 ++- arch/x86/include/asm/cpufeatures.h | 2 + arch/x86/include/asm/irqflags.h | 7 +- arch/x86/include/asm/mshyperv.h | 2 +- arch/x86/include/asm/paravirt.h | 169 +++++++++---------- arch/x86/include/asm/paravirt_types.h | 210 +++++++++--------------- arch/x86/kernel/Makefile | 3 +- arch/x86/kernel/alternative.c | 51 +++++- arch/x86/kernel/asm-offsets.c | 7 - arch/x86/kernel/cpu/vmware.c | 5 +- arch/x86/kernel/kvm.c | 2 +- arch/x86/kernel/kvmclock.c | 2 +- arch/x86/kernel/paravirt-spinlocks.c | 9 + arch/x86/kernel/paravirt.c | 78 +++------ arch/x86/kernel/paravirt_patch.c | 99 ----------- arch/x86/kernel/tsc.c | 2 +- arch/x86/xen/enlighten_pv.c | 4 +- arch/x86/xen/time.c | 26 +-- drivers/xen/time.c | 3 +- include/linux/static_call.h | 18 -- include/linux/static_call_types.h | 18 ++ tools/include/linux/static_call_types.h | 18 ++ 30 files changed, 348 insertions(+), 474 deletions(-) delete mode 100644 arch/x86/kernel/paravirt_patch.c