Received: by 2002:a05:7412:a9a2:b0:e2:908c:2ebd with SMTP id o34csp1382761rdh; Fri, 27 Oct 2023 12:29:26 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH09HXsjQ1ssjqDHQQ9wSt/HcJRk7I1+p4YmhQk3+dHQOQDd65QerZISA/ALNoQqv9i9bjE X-Received: by 2002:a25:b0a7:0:b0:d81:917c:69b with SMTP id f39-20020a25b0a7000000b00d81917c069bmr3649811ybj.10.1698434966284; Fri, 27 Oct 2023 12:29:26 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1698434966; cv=none; d=google.com; s=arc-20160816; b=OzxbXEEtnTpE09MrwbJ9ktQLbP5uHoVGVvNM89Z5ZmC8PdhYSVB9TRTlzVgFGTk8zP ipUsBHx9io10SmE0UfkX1HknD4CFv78GSr2U0f9TcifnS5XdTcWhMwNJyhM/2X1rHVc0 0nhSQLXRmBbvGi+aSDCyZ4r/42aMzLhEPArdcKkM22usS8Im6cBxnDQysGJyaSb+qzZK LiD+kOmQGqCNfzxymt74zjLkIsMZOqM7u0xy2O5CupPyFhx8ByCtUcoqrnq6K+QIU88o 6v+iYNJjUsmnr2V+x/a47PilvT/FPFB2VArp4qh4mCwCB6kv4N4Lpqxpmm5EoXbkMAht 6F3Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=xbxovbWtvS5eUVU7qTa2e3X1XxpP9O0TH7iacPYNpeg=; fh=LIAit08ByDgkRLqlEmM1nmhI6SEZnuCWjlP1SRPYJ5Q=; b=N0bNAVhFoH+LmewEQ82bJexyhYHyf/Qq0BYsQDJ5rumo3ubpA0Ij4Niz3Y7evGhnvt ElPl1Tn66Uiy3OIFRZ6IOMDGOG7Aq17IgVdXrWGQZYyyUgzCsDHezpRtYQkcewHvMeH0 RuBMAeH9Bfac5R3ht7bX3sQF0ksZaPyV9EYa2whRDRIsMG8ke+C+TkWht5ybclA1Khva WTFO5C8QOnNYj2aOP78G3Un+/X2/ec3lSXOndxSlrZiTuvGsgg1q3O9P8DigJRIomjQH aZVdP370nvt5Fu8Hz0sPlTTn6uffALrSeT0MhTbsptIkW+fQRDHvjUnfouFq3EQS2LIN cBuw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@alien8.de header.s=alien8 header.b=HqFjx8cw; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Return-Path: Received: from snail.vger.email (snail.vger.email. [23.128.96.37]) by mx.google.com with ESMTPS id 10-20020a25000a000000b00da035a9366bsi3761817yba.308.2023.10.27.12.29.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Oct 2023 12:29:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=alien8 header.b=HqFjx8cw; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id 572CE829991F; Fri, 27 Oct 2023 12:29:24 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231360AbjJ0T3X (ORCPT + 99 others); Fri, 27 Oct 2023 15:29:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54840 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230451AbjJ0T3W (ORCPT ); Fri, 27 Oct 2023 15:29:22 -0400 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD517E5 for ; Fri, 27 Oct 2023 12:29:20 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id 205A740E018F; Fri, 27 Oct 2023 19:29:19 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id FeXw8_sEkfdh; Fri, 27 Oct 2023 19:29:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1698434956; bh=xbxovbWtvS5eUVU7qTa2e3X1XxpP9O0TH7iacPYNpeg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HqFjx8cwjFdeZKQXtZlqXtDA+1oLEoIhAt0zNaDVoYGFbWWgaKaA1X/TyI/teERfy Nu4zziBp8DwkjLOWSHQtltFppG0zKCWcvUgfY4ztsADPxDC9kFTXSsdRpDOG2a1yyI UuVYsS9R+37+fUxt8IqimJpsdy3/85j1kx3MPc5hZ3xu+VfX2UwDknCoZrBEjpTLOK rROXF0kiH9XPkRytUlTxJ8zCGVgbmevLoujDZqr8CWgj3NHFP3Xn/n9fhYiw7cGYcS K8f0fiVj4+jIIaB5mzBz3I5cW6TrNnYVDoZK27VwsMFnPrLvXp1K1XJKUoR9rC+xC/ ARf0P99Ic/aQDNDG+drt/h4U+xTQOgH5fWfrczAqUeuqOeujj6wRRklxNbrGX2Sd1i d8239NLo3w8mZzo/kcbjrjHvVDFF2mRQSUDw0gPff+RfXSYKtlXHBOE/NboAMGzcj4 d+kSxJTHHCVvVlIpDJl34QaHSHi1pVweuf536cAV8BdGudR9UPksW1m8NaEjNnyCq9 vJIK04IpN8IEDWa+9T0gFhUeurMXVQiikQEyqnb+1Q2A+EZSPcWzWGvRBcznHckscf c2/x10CSiMHVWFbUyaRF/ryuD6vdTweo50Q9LNMYxmCaygxgdCruGd5mZHh+SkytFb OTtTSpWUtMiiSUQqGo18t8ig= Received: from zn.tnic (pd95304da.dip0.t-ipconnect.de [217.83.4.218]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 959E540E0173; Fri, 27 Oct 2023 19:29:12 +0000 (UTC) Date: Fri, 27 Oct 2023 21:29:07 +0200 From: Borislav Petkov To: Peter Zijlstra Cc: X86 ML , Kishon VijayAbraham , LKML Subject: Re: [PATCH 2/2] x86/barrier: Do not serialize MSR accesses on AMD Message-ID: <20231027192907.GSZTwPg8v7NF6+Zn0w@fat_crate.local> References: <20230622095212.20940-1-bp@alien8.de> <20230703125419.GJ4253@hirez.programming.kicks-ass.net> <20230704074631.GAZKPOV/9BfqP0aU8v@fat_crate.local> <20230704090132.GP4253@hirez.programming.kicks-ass.net> <20230704092222.GBZKPkzgdM8rbPe7zA@fat_crate.local> <20231027153327.GKZTvYR3qslaTUjtCT@fat_crate.local> <20231027153458.GMZTvYou1tlK6HD8/Y@fat_crate.local> <20231027185641.GE26550@noisy.programming.kicks-ass.net> <20231027191633.GRZTwMkaiW1nyvnzzO@fat_crate.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20231027191633.GRZTwMkaiW1nyvnzzO@fat_crate.local> X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Fri, 27 Oct 2023 12:29:24 -0700 (PDT) On Fri, Oct 27, 2023 at 09:16:33PM +0200, Borislav Petkov wrote: > Thus the more conservative approach here. And on a second thought, I don't need any of that new stuff - I simply need a synthetic flag which says "MSRs need fencing" and set it on everything but AMD and Hygon. And we've solved this type of issue gazillion times already - why am I reinventing the wheel?! :-\ -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette