From patchwork Tue Oct 27 13:54:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 312685 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 0DD05C388F9 for ; Tue, 27 Oct 2020 15:13:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BCBA62224A for ; Tue, 27 Oct 2020 15:13:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603811591; bh=4q+xtkTEw+8lhssERipfns72GCshcPgkPtDFSe2mnDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OFzYd0g+RTTGqASvQnsKYKjm2PlcGIEj8lcl9Zja8SF3GL0wVYEYSdCKKfGcnX5BF 0AZLjQ75k19HeKia+06rX5eeixjxmZ5p9UniEZj8VLAK+HG3NGA1mKQRD6HnvzPC8Q g5NsX42eklFNuXVzB0CxDs/b/qz9UN7LcURoTpmU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1792968AbgJ0PNK (ORCPT ); Tue, 27 Oct 2020 11:13:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:49808 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1794706AbgJ0PNJ (ORCPT ); Tue, 27 Oct 2020 11:13:09 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DEABE20657; Tue, 27 Oct 2020 15:13:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603811588; bh=4q+xtkTEw+8lhssERipfns72GCshcPgkPtDFSe2mnDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wES//fZr9di5V+I3hIq/FmnL+gjd8ZCeSsSlDYnKy+YMpqa6yu5Ul5kSquyrjP4eb k/ZeQXRuWuaqmHed9PFV3gVXoGkmbyUqbgUfrJsuFHLCh2xRai1l0SeFbBt91fD8aV l4bYullFNrC3ZVQNFMb9axO6bEFjnNqTyK6uvtw4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Borislav Petkov , Sasha Levin Subject: [PATCH 5.8 545/633] x86/mce: Annotate mce_rd/wrmsrl() with noinstr Date: Tue, 27 Oct 2020 14:54:48 +0100 Message-Id: <20201027135548.362166679@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135522.655719020@linuxfoundation.org> References: <20201027135522.655719020@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Borislav Petkov [ Upstream commit e100777016fdf6ec3a9d7c1773b15a2b5eca6c55 ] They do get called from the #MC handler which is already marked "noinstr". Commit e2def7d49d08 ("x86/mce: Make mce_rdmsrl() panic on an inaccessible MSR") already got rid of the instrumentation in the MSR accessors, fix the annotation now too, in order to get rid of: vmlinux.o: warning: objtool: do_machine_check()+0x4a: call to mce_rdmsrl() leaves .noinstr.text section Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20200915194020.28807-1-bp@alien8.de Signed-off-by: Sasha Levin --- arch/x86/kernel/cpu/mce/core.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 14e4b4d17ee5b..d8dca24feccbe 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -371,16 +371,25 @@ static int msr_to_offset(u32 msr) } /* MSR access wrappers used for error injection */ -static u64 mce_rdmsrl(u32 msr) +static noinstr u64 mce_rdmsrl(u32 msr) { u64 v; if (__this_cpu_read(injectm.finished)) { - int offset = msr_to_offset(msr); + int offset; + u64 ret; + instrumentation_begin(); + + offset = msr_to_offset(msr); if (offset < 0) - return 0; - return *(u64 *)((char *)this_cpu_ptr(&injectm) + offset); + ret = 0; + else + ret = *(u64 *)((char *)this_cpu_ptr(&injectm) + offset); + + instrumentation_end(); + + return ret; } if (rdmsrl_safe(msr, &v)) { @@ -396,13 +405,19 @@ static u64 mce_rdmsrl(u32 msr) return v; } -static void mce_wrmsrl(u32 msr, u64 v) +static noinstr void mce_wrmsrl(u32 msr, u64 v) { if (__this_cpu_read(injectm.finished)) { - int offset = msr_to_offset(msr); + int offset; + instrumentation_begin(); + + offset = msr_to_offset(msr); if (offset >= 0) *(u64 *)((char *)this_cpu_ptr(&injectm) + offset) = v; + + instrumentation_end(); + return; } wrmsrl(msr, v);