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=-9.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 B537BC47420 for ; Wed, 30 Sep 2020 14:13:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6FB57207C3 for ; Wed, 30 Sep 2020 14:13:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="vNXiy2Wt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730402AbgI3ONx (ORCPT ); Wed, 30 Sep 2020 10:13:53 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:56480 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730261AbgI3ONw (ORCPT ); Wed, 30 Sep 2020 10:13:52 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08UE55JZ169228; Wed, 30 Sep 2020 14:13:44 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 : content-transfer-encoding; s=corp-2020-01-29; bh=0Tu7KhorhnS/GIgWf3boys7UzLxnsTMgPv4MJWNbOQQ=; b=vNXiy2Wtl3YwsT2l8/AWOCHnMwzzFPJ1qFVmauADuTBDp5hEqsBUd7Zuxz5DJKg2Ooei Dtn8maNiYM6BKDP12m++U0FgGdp+ndorl7rKR6eT6HKjeK7sWzHq/lHhMloEAlVeBXuo 1RT9+Wq7CqOCmhQFXQpbfD2ovOrbdLkW9pC4hoZ2zElDjbAarogPP0xw1gmTfLVc24YB 1I/Ni30dAC2Hsvo/Qc8NyXEXrORZiJpcBNqIqb8u+lzoiSV9/kv495DUUR0iG32IJ4px g8SQLItT/sN8Nyja6DVDUty5kd5shT11yQlwTN4OlW783pdTxqOj5A/NZM+SKTKqMgW2 Zg== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 33sx9n8nf0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 30 Sep 2020 14:13:44 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08UEAoC3185373; Wed, 30 Sep 2020 14:13:43 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 33tfdu00ef-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 30 Sep 2020 14:13:43 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 08UEDgB7020641; Wed, 30 Sep 2020 14:13:42 GMT Received: from [10.74.86.12] (/10.74.86.12) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 30 Sep 2020 07:13:41 -0700 Subject: Re: [PATCH] xen/arm: do not setup the runstate info page if kpti is enabled To: Stefano Stabellini , linux-kernel@vger.kernel.org Cc: Stefano Stabellini , Bertrand Marquis , jgross@suse.com References: <20200924234955.15455-1-sstabellini@kernel.org> From: boris.ostrovsky@oracle.com Organization: Oracle Corporation Message-ID: <4aca4d30-f418-bfab-8a9c-74f349f4ca02@oracle.com> Date: Wed, 30 Sep 2020 10:13:39 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 MIME-Version: 1.0 In-Reply-To: <20200924234955.15455-1-sstabellini@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9759 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 phishscore=0 adultscore=0 malwarescore=0 spamscore=0 mlxscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009300113 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9759 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 suspectscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 adultscore=0 clxscore=1011 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009300112 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/24/20 7:49 PM, Stefano Stabellini wrote: > From: Stefano Stabellini > > The VCPUOP_register_runstate_memory_area hypercall takes a virtual > address of a buffer as a parameter. The semantics of the hypercall are > such that the virtual address should always be valid. > > When KPTI is enabled and we are running userspace code, the virtual > address is not valid, thus, Linux is violating the semantics of > VCPUOP_register_runstate_memory_area. > > Do not call VCPUOP_register_runstate_memory_area when KPTI is enabled. > > Signed-off-by: Stefano Stabellini > CC: Bertrand Marquis > CC: boris.ostrovsky@oracle.com > CC: jgross@suse.com Applied to for-linus-5.10 -boris