From patchwork Mon Mar 8 12:28:32 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: 12122135 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=-12.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 2D522C433E0 for ; Mon, 8 Mar 2021 12:30:31 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 9356064EBC for ; Mon, 8 Mar 2021 12:30:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9356064EBC Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=b1mJfFlQ2kuIQzt5i2uOO46O1iaYaZ7hXXy7T55BjDE=; b=OgBD8PTJkufK9lsrL096ZQN9Dw iZUWhsv+saZ2alBGYabsGMr19Cor3jsB28R/byvJSJt1A1LFN/kGcb4P7oMlCRLighhOMhyqfe5MB 1DS3CSlCRrNAdA/xoD3wj7C2qHfLzqXMdOEwBxI3H2LSslQBSaRpZUaf1norfgZbwUFr/47vRfcsx +1QT/6dpxr7W3mjWV1bK5H+ewTZWc1MizAowQTzOFeM4USxMSMFEgkdhFq8pK0j1JMQKG/+LEOxwa qDg4wxgykDJe7raTCWSnyQ30780bq7ewOx3N392bG7feYa8LnJvGoMJUwrTG/xiRAfWgGIjfOkWCj ZBLAUXEA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lJF0O-00H5g3-5i; Mon, 08 Mar 2021 12:29:00 +0000 Received: from mx2.suse.de ([195.135.220.15]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lJF0G-00H5cZ-Rm for linux-arm-kernel@lists.infradead.org; Mon, 08 Mar 2021 12:28:54 +0000 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=1615206531; 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=Pj0+lsoXMYSDviFMNu3CfGDulAqhBZd0duxurV0jt/k=; b=ullbjypHk4a2OSdXRZBXV7LzXx1wRPq0P3DUkuf3g00TxnX2Kvmikn2mvZgT5yu1bK+GT9 Pb18L02feaPu+UmwjPoQNvBkbpJDORl8H6ArZ/XWAobYvxZmsd1kHtOeWcA3mN+bVvHI/I evXt2ltyGZ054ZgETkOoGM4IjjxGEog= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id EE520ADCD; Mon, 8 Mar 2021 12:28:50 +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 v5 00/12] x86: major paravirt cleanup Date: Mon, 8 Mar 2021 13:28:32 +0100 Message-Id: <20210308122844.30488-1-jgross@suse.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210308_122852_990348_E0BF457C X-CRM114-Status: GOOD ( 14.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 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): staticcall: 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 | 10 + arch/x86/include/asm/alternative.h | 28 ++- arch/x86/include/asm/cpufeature.h | 2 + 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 | 167 +++++++------- arch/x86/include/asm/paravirt_types.h | 210 +++++++----------- arch/x86/kernel/Makefile | 3 +- arch/x86/kernel/alternative.c | 37 ++- 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 | 11 +- 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 ++ tools/objtool/arch/x86/include/arch/special.h | 6 +- 32 files changed, 339 insertions(+), 468 deletions(-) delete mode 100644 arch/x86/kernel/paravirt_patch.c Acked-by: Peter Zijlstra (Intel)