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[156.151.31.86]) by mx.google.com with ESMTPS id u2si1946477qka.125.2019.02.14.09.19.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Feb 2019 09:19:59 -0800 (PST) Received-SPF: pass (google.com: domain of khalid.aziz@oracle.com designates 156.151.31.86 as permitted sender) client-ip=156.151.31.86; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=1Q3h77ek; spf=pass (google.com: domain of khalid.aziz@oracle.com designates 156.151.31.86 as permitted sender) smtp.mailfrom=khalid.aziz@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x1EHEh9O126979; Thu, 14 Feb 2019 17:19:28 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type; s=corp-2018-07-02; bh=Z/qAl0rILNkjo+9n96+ul65QbUgdUPpDBNBiImZV1P4=; b=1Q3h77ek/zcGl7JP4I1iF7b4Hd/BiLn5LlRyb46NoP9p/3eNXUtoIXxQ0usjbmwA/eKV 4lbXkmHLYKUrS6lMKRlRXS5f5lbIoJwThJXYI73oU1OPchgUDeibud+cHIokXFU6JrlW ZGIvam5pTDfWLBEUl2fuxtP3QP8lKW2unELvZ6gVTZWYrCuDReVvdWoOFiK45WABD8yV Er90dBqJdIOtKiH9ONgPnGbS18o3KWHnElNE2wFCcLjenypobwery40aQmsh2mklGa+f xoc4FdeJyPR0nuWtHgQomJC2wO859Y+gYZD+4wOMtYGER4l+mYbIne5K3+CHeHt6qaPi og== Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp2130.oracle.com with ESMTP id 2qhreksbbt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Feb 2019 17:19:28 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id x1EHJRxJ005673 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Feb 2019 17:19:27 GMT Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x1EHJRWM021695; Thu, 14 Feb 2019 17:19:27 GMT Received: from [192.168.1.16] (/24.9.64.241) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 14 Feb 2019 17:19:26 +0000 Subject: Re: [RFC PATCH v8 03/14] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO) To: Borislav Petkov , juergh@gmail.com Cc: Peter Zijlstra , tycho@tycho.ws, jsteckli@amazon.de, ak@linux.intel.com, torvalds@linux-foundation.org, liran.alon@oracle.com, keescook@google.com, akpm@linux-foundation.org, mhocko@suse.com, catalin.marinas@arm.com, will.deacon@arm.com, jmorris@namei.org, konrad.wilk@oracle.com, Juerg Haefliger , deepa.srinivasan@oracle.com, chris.hyser@oracle.com, tyhicks@canonical.com, dwmw@amazon.co.uk, andrew.cooper3@citrix.com, jcm@redhat.com, boris.ostrovsky@oracle.com, kanth.ghatraju@oracle.com, joao.m.martins@oracle.com, jmattson@google.com, pradeep.vincent@oracle.com, john.haxby@oracle.com, tglx@linutronix.de, kirill.shutemov@linux.intel.com, hch@lst.de, steven.sistare@oracle.com, labbott@redhat.com, luto@kernel.org, dave.hansen@intel.com, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Marco Benatto References: <8275de2a7e6b72d19b1cd2ec5d71a42c2c7dd6c5.1550088114.git.khalid.aziz@oracle.com> <20190214105631.GJ32494@hirez.programming.kicks-ass.net> <20190214161552.GF4423@zn.tnic> From: Khalid Aziz Organization: Oracle Corp Message-ID: <6c689028-6748-66b9-0d9c-2b57b5dd6383@oracle.com> Date: Thu, 14 Feb 2019 10:19:23 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190214161552.GF4423@zn.tnic> Content-Type: multipart/mixed; boundary="------------8D637083EDAD02B721201657" Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9167 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902140117 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This is a multi-part message in MIME format. --------------8D637083EDAD02B721201657 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2/14/19 9:15 AM, Borislav Petkov wrote: > On Thu, Feb 14, 2019 at 11:56:31AM +0100, Peter Zijlstra wrote: >>> +EXPORT_SYMBOL(xpfo_kunmap); >> >> And these here things are most definitely not IRQ-safe. >=20 > Should also be EXPORT_SYMBOL_GPL. >=20 Agreed. On the other hand, is there even a need to export this? It should only be called from kunmap() or kunmap_atomic() and not from any module directly. Same for xpfo_kmap. 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