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=-6.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT 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 1E24CC04AAF for ; Tue, 21 May 2019 04:53:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2CC521783 for ; Tue, 21 May 2019 04:53:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727793AbfEUExP (ORCPT ); Tue, 21 May 2019 00:53:15 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:44768 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725835AbfEUExP (ORCPT ); Tue, 21 May 2019 00:53:15 -0400 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4L4qPwM022521 for ; Tue, 21 May 2019 00:53:14 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0a-001b2d01.pphosted.com with ESMTP id 2sm97wtrd4-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 21 May 2019 00:53:14 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 21 May 2019 05:53:10 +0100 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4L4r8jW16974156 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 21 May 2019 04:53:09 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D865DC6055; Tue, 21 May 2019 04:53:08 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EC21DC6057; Tue, 21 May 2019 04:52:58 +0000 (GMT) Received: from morokweng.localdomain.com (unknown [9.80.203.157]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 21 May 2019 04:52:57 +0000 (GMT) From: Thiago Jung Bauermann To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, Alexey Kardashevskiy , Anshuman Khandual , Benjamin Herrenschmidt , Christoph Hellwig , Michael Ellerman , Mike Anderson , Paul Mackerras , Ram Pai , Claudio Carvalho , Ryan Grimm , Thiago Jung Bauermann Subject: [PATCH 08/12] powerpc/pseries/svm: Export guest SVM status to user space via sysfs Date: Tue, 21 May 2019 01:49:08 -0300 X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190521044912.1375-1-bauerman@linux.ibm.com> References: <20190521044912.1375-1-bauerman@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19052104-0004-0000-0000-000015120A43 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011134; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000286; SDB=6.01206343; UDB=6.00633450; IPR=6.00987310; MB=3.00026980; MTD=3.00000008; XFM=3.00000015; UTC=2019-05-21 04:53:13 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19052104-0005-0000-0000-00008BBE4C66 Message-Id: <20190521044912.1375-9-bauerman@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-20_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 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-1905210031 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ryan Grimm User space might want to know it's running in a secure VM. It can't do a mfmsr because mfmsr is a privileged instruction. The solution here is to create a cpu attribute: /sys/devices/system/cpu/svm which will read 0 or 1 based on the S bit of the guest's CPU 0. Signed-off-by: Ryan Grimm Reviewed-by: Ram Pai Signed-off-by: Thiago Jung Bauermann --- arch/powerpc/kernel/sysfs.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index e8e93c2c7d03..8fdab134e9ae 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "cacheinfo.h" #include "setup.h" @@ -714,6 +715,32 @@ static struct device_attribute pa6t_attrs[] = { #endif /* HAS_PPC_PMC_PA6T */ #endif /* HAS_PPC_PMC_CLASSIC */ +#ifdef CONFIG_PPC_SVM +static void get_svm(void *val) +{ + u32 *value = val; + + *value = is_secure_guest(); +} + +static ssize_t show_svm(struct device *dev, struct device_attribute *attr, char *buf) +{ + u32 val; + smp_call_function_single(0, get_svm, &val, 1); + return sprintf(buf, "%u\n", val); +} +static DEVICE_ATTR(svm, 0444, show_svm, NULL); + +static void create_svm_file(void) +{ + device_create_file(cpu_subsys.dev_root, &dev_attr_svm); +} +#else +static void create_svm_file(void) +{ +} +#endif /* CONFIG_PPC_SVM */ + static int register_cpu_online(unsigned int cpu) { struct cpu *c = &per_cpu(cpu_devices, cpu); @@ -1057,6 +1084,8 @@ static int __init topology_init(void) sysfs_create_dscr_default(); #endif /* CONFIG_PPC64 */ + create_svm_file(); + return 0; } subsys_initcall(topology_init);