Received: by 2002:a25:1985:0:0:0:0:0 with SMTP id 127csp492838ybz; Tue, 21 Apr 2020 13:05:45 -0700 (PDT) X-Google-Smtp-Source: APiQypIr6qh9+RY9dFwniD4G+STo4AFOJimm2HFE40G3ersDfLaWp4fFPWExfpitbEzYMOgpcw7f X-Received: by 2002:a50:99c4:: with SMTP id n4mr21095268edb.187.1587499545288; Tue, 21 Apr 2020 13:05:45 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1587499545; cv=none; d=google.com; s=arc-20160816; b=KKAVXmnqzKj7MyvlwJn8jNaZtUrk4RYdDLZnpLtHuDGPQeDybr/z5JHFn5zII99l6Y RyU0Xp/k6gM8Nu8hma1RcowPd6HeEuTpDAqbpm5/0DKSzUSUfhUmMJ9AhemlIyN8RujJ L+UQevTaEc4T+EEnmWkxNGe9CuwXOCNmykCGScYXsMvss0DJ3r1qZZ5D8ESGezxaE12j j6DRgkDmtLbPumO58RTNneHnH23FXATurRe/QAJnc1g3FCUoMb7U/xTrr1ZzsE1hs0lb ITyo7RykMgvwL4KsLQcpvPKD7PXdRPvTzPQmc2bJzIBEE86T+2U3lFxJFNYSWrBhEOf5 gZCw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :ironport-sdr:ironport-sdr; bh=KMWyMAeJr0ZWUR0S6LW8XMe7f3NxjZalmgRxNaBlEIc=; b=ljMJVzbKwdupQoVLBsiDoO0dYmKHpQZzgGIwADNfPFZ683fZkLCzHz/UgoFfFAYq8f QK3u7zyjQ+gchwOaf4hQ4JtGZkAhxWmczQGaqmVkhzSaVdaL2B5y6IUaWTMIfdtcMCmk FvUUl9Blrt2JDYxqZCvjhzmCHPPcYK2VHwMLCb/Gjxwm6gPhLDSHm5HO18w9ZT+wbyWv 8+b1KZcFJuDTaj1bhPGSyN0WskzmNZ7u0lZiDHqQn1lFnw2Lq8G9hMTofySj/qV4Don7 A1Y06rQ9yzTZhYtBam0vMqQWKMNJd3RdatURnxoIzuE8uW0bf/YQgWjxgK79hOC4x6Hx 2F6A== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id i8si2268564ejf.197.2020.04.21.13.05.17; Tue, 21 Apr 2020 13:05:45 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726316AbgDUUCl (ORCPT + 99 others); Tue, 21 Apr 2020 16:02:41 -0400 Received: from mga06.intel.com ([134.134.136.31]:1449 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726012AbgDUUCl (ORCPT ); Tue, 21 Apr 2020 16:02:41 -0400 IronPort-SDR: 9LMCkZh6WqQfef3hyLjgYEId+QPsf/GuENHrfZrTkyQ46bB39l3oGPtA0tAMjIeKROPmyxTKJ6 hTqkm7kFRpqA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2020 13:02:39 -0700 IronPort-SDR: WGO5L1b5M/SkryVnOfAy0jnwxIRI1aVohTJFLb5GtiSS48MxksDrmoyJJOkdTf3nxB3nh1UTcN gf4S1rIQoxLQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,411,1580803200"; d="scan'208";a="290589627" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.21]) by fmsmga002.fm.intel.com with ESMTP; 21 Apr 2020 13:02:38 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id C5CCC3019B6; Tue, 21 Apr 2020 13:02:37 -0700 (PDT) Date: Tue, 21 Apr 2020 13:02:37 -0700 From: Andi Kleen To: Andy Lutomirski Cc: Sasha Levin , Thomas Gleixner , Andy Lutomirski , "Bae, Chang Seok" , "Metzger, Markus T" , "hpa@zytor.com" , "bp@alien8.de" , "Hansen, Dave" , "Luck, Tony" , Pedro Alves , Simon Marchi , "Shankar, Ravi V" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v9 00/17] Enable FSGSBASE instructions Message-ID: <20200421200237.GF608746@tassilo.jf.intel.com> References: <20200421160622.GJ1809@sasha-vm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > The very early versions had severely problematic ABIs. The new ones are probably okay except for, maybe, ptrace. If we had merged the old ones, then we might have gotten stuck with the old, problematic ABI. This is beyond vague. Is there a problem with the ABI or not? If yes please point it out in an actionable concrete way that it can be addressed. If not there shouldn't be any reason to further block it. Thanks -Andi