From mboxrd@z Thu Jan 1 00:00:00 1970 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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 564ABC433E0 for ; Thu, 9 Jul 2020 15:57:06 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id AD4002077D for ; Thu, 9 Jul 2020 15:57:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD4002077D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-19270-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 7613 invoked by uid 550); 9 Jul 2020 15:56:59 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 7590 invoked from network); 9 Jul 2020 15:56:58 -0000 IronPort-SDR: mZyeTFjwt04gNlx1ZsZxCJxijwxkKxpj8a9TAHEpAOeHDPNbYF9+olcwalF1CfpCDOsS7jBFyI 3G9JXZvGH8TQ== X-IronPort-AV: E=McAfee;i="6000,8403,9677"; a="166119954" X-IronPort-AV: E=Sophos;i="5.75,331,1589266800"; d="scan'208";a="166119954" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False IronPort-SDR: myidNpIhd1R1WE/IoJ0NU3MH9h/JFnLjAMF9TUaQ9XtENmEVFAn/2BKF5Y0USxBlSvjYwlbBtD /q5r4e4h2r8g== X-IronPort-AV: E=Sophos;i="5.75,331,1589266800"; d="scan'208";a="457952181" Subject: Re: [PATCH 2/4] KVM: x86: Introduce paravirt feature CR0/CR4 pinning To: "Andersen, John" , Paolo Bonzini Cc: Sean Christopherson , corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, shuah@kernel.org, liran.alon@oracle.com, drjones@redhat.com, rick.p.edgecombe@intel.com, kristen@linux.intel.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, mchehab+huawei@kernel.org, gregkh@linuxfoundation.org, paulmck@kernel.org, pawan.kumar.gupta@linux.intel.com, jgross@suse.com, mike.kravetz@oracle.com, oneukum@suse.com, luto@kernel.org, peterz@infradead.org, fenghua.yu@intel.com, reinette.chatre@intel.com, vineela.tummalapalli@intel.com, dave.hansen@linux.intel.com, arjan@linux.intel.com, caoj.fnst@cn.fujitsu.com, bhe@redhat.com, nivedita@alum.mit.edu, keescook@chromium.org, dan.j.williams@intel.com, eric.auger@redhat.com, aaronlewis@google.com, peterx@redhat.com, makarandsonare@google.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, kernel-hardening@lists.openwall.com References: <20200617190757.27081-1-john.s.andersen@intel.com> <20200617190757.27081-3-john.s.andersen@intel.com> <0fa9682e-59d4-75f7-366f-103d6b8e71b8@intel.com> <20200618144314.GB23@258ff54ff3c0> <124a59a3-a603-701b-e3bb-61e83d70b20d@intel.com> <20200707211244.GN20096@linux.intel.com> <19b97891-bbb0-1061-5971-549a386f7cfb@intel.com> <31eb5b00-9e2a-aa10-0f20-4abc3cd35112@redhat.com> <20200709154412.GA25@64c96d3be97b> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200709154412.GA25@64c96d3be97b> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit On 7/9/20 8:44 AM, Andersen, John wrote: > > Bits which are allowed to be pinned default to WP for CR0 and SMEP, > SMAP, and UMIP for CR4. I think it also makes sense to have FSGSBASE in this set. I know it hasn't been tested, but I think we should do the legwork to test it. If not in this set, can we agree that it's a logical next step?