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[23.128.96.35]) by mx.google.com with ESMTPS id f12-20020a0cbecc000000b0065af6e81f13si883712qvj.121.2023.10.27.08.33.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Oct 2023 08:33:52 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) client-ip=23.128.96.35; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=alien8 header.b=LsGQB2Bj; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 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 groat.vger.email (Postfix) with ESMTP id 7692A83C0E06; Fri, 27 Oct 2023 08:33:48 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at groat.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346291AbjJ0Pdj (ORCPT + 99 others); Fri, 27 Oct 2023 11:33:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346277AbjJ0Pdi (ORCPT ); Fri, 27 Oct 2023 11:33:38 -0400 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C5ABB8 for ; Fri, 27 Oct 2023 08:33:36 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id B269F40E0173; Fri, 27 Oct 2023 15:33:34 +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 H-th4CV3RACo; Fri, 27 Oct 2023 15:33:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1698420812; bh=gH1kGJW0H+Ql6cmbGG3S9bXgwseObYu3GOaSMnhwaIY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LsGQB2Bj+r4IDFoCCx04vffocr2pg+oiLi1PMbT5u1yRH2kP3EKC9Oh6ehwvrnmdp vQ5ueen79s0QBnS9mNb1y/wNxCdEBXM3rkhOtUJphmj2TVdC99e4bYXZN4WQvC/RQr RTWAA3CiAXo7/zUo3qtUTwVhkoANFbW3odT4+z3QEp8fCmsb5f/v2/ZuqWAO9mZGOR o+aebCYt+amp/+YqTcphVOXHvWOXVPvJglQrcSrD6HrLUZotrg5XXKOpwZxou8KsUx m0u8I9YxrDw2T/E3gmwB8EYa3h8du7wIyTMPXXqpBkvpjRo2ejY7daVddDiofNwInL saqiE9AeoUgCbbhLRvcB+kqbUd+/kB11EF9h32TYn1jRB0jFDhTX6metq2OTU8+EHZ TgXO93PLq/tCiEyWLzo/0LGXrQipzt7vcpboePEMM4V3GzaX0kz3oVWjbuTUwRJmyp IaSfzMPYifeCZqSzfBrQnUFFxkjLyYjqxA8YKNnM5RnFbekmtzh6XtFaZCrbELjz2Y tXPfAzrsiUIlnuZVyPrUYRXYNNf3vh7PJqSupl1etKZ9+CNj13zbpopwEybUAnBmSE Xtu+2hRNmz4sGGHnF48qWCQXCzr8m6iNc2gfJw4gBTXLjPzf/u3UxDsvuYYhii0eR/ YuSVHj7xdj1SesimBJGfI03I= 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 C828940E0171; Fri, 27 Oct 2023 15:33:28 +0000 (UTC) Date: Fri, 27 Oct 2023 17:33:27 +0200 From: Borislav Petkov To: Peter Zijlstra Cc: X86 ML , Kishon VijayAbraham , LKML Subject: Re: [PATCH] x86/barrier: Do not serialize MSR accesses on AMD Message-ID: <20231027153327.GKZTvYR3qslaTUjtCT@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> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230704092222.GBZKPkzgdM8rbPe7zA@fat_crate.local> X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email 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 (groat.vger.email [0.0.0.0]); Fri, 27 Oct 2023 08:33:48 -0700 (PDT) On Tue, Jul 04, 2023 at 11:22:22AM +0200, Borislav Petkov wrote: > I'm wondering if we could make: > > alternative("mfence; lfence;", "", X86_VENDOR_AMD); > > work... Seems to work in my guest here and it don't look half as bad. See replies to this message. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette